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Quelccaya Ice Cap

October 21, 2023

The Quelccaya Ice Cap (also known as Quenamari Ice Cap) is the second largest glaciated area in the tropics, after Coropuna. Located in the Cordillera Oriental section of the Andes mountains in Peru, the cap covers an area of 42.8 square kilometres (16.5 sq mi) with ice up to 200 metres (660 ft) thick. It is surrounded by tall ice cliffs and a number of outlet glaciers, the largest of which is known as Qori Kalis Glacier; lakes, moraines, peat bogs and wetlands are also present. There is a rich flora and fauna, including birds that nest on the ice cap. Quelccaya is an important source of water, eventually melting and flowing into the Inambari and Vilcanota Rivers.

Quelccaya
Quenamari
November 2022 satellite image of the glacier by Sentinel-2.
TypeIce cap
LocationPeru
Coordinates13°55′30″S 70°49′03″W / 13.92500°S 70.81750°W / -13.92500; -70.81750[1]
Area42.8 sq km (16.5 sq mi) in 2009
Length17 km
Width3-5 km
Thickness100-150 m (200 m at thickest)
Highest elevation5,700 m
Lowest elevation5,200 m
StatusRetreating

A number of ice cores have been obtained from Quelccaya, including two from 1983 that were the first recovered outside of the polar regions. Past climate states have been reconstructed from data in these ice cores; these include evidence of the Little Ice Age, regional droughts and wet periods with historical significance and past and recent El Niño events. The ice cap is regularly monitored and has a weather station.

Quelccaya was much larger in the past, merging with neighbouring glaciers during the Pleistocene epoch. A secondary expansion occurred during either the Antarctic Cold Reversal or the Younger Dryas climate anomalies. At the beginning of the Holocene the ice cap shrank to a size smaller than present day; around 5,000 years ago, a neoglacial expansion began. A number of moraines – especially in the Huancané valley – testify to past expansions and changes of Quelccaya, although the chronology of individual moraines is often unclear.

After reaching a secondary highstand (area expansion) during the Little Ice Age, Quelccaya has been shrinking due to human-caused climate change; in particular the Qori Kalis Glacier has been retreating significantly. Life and lakes have been occupying the terrain left by retreating ice; these lakes can be dangerous as they can cause floods when they breach. Climate models predict that without climate change mitigation measures, Quelccaya is likely to disappear during the 21st or 22nd century.

Geography Edit

The Quelccaya Ice Cap lies in the tropical highlands of southern Peru, in the Cordillera Oriental/eastern Andes.[2][3] The Cordillera Vilcanota mountain range is ten kilometres (6.2 mi) northwest of Quelccaya,[4][5] and Quelccaya is sometimes considered to be part of it;[6] occasionally Quelccaya is also linked to the Cordillera Carabaya range.[7] East of Quelccaya, the Andes drop off steeply to the Amazon basin.[8] The Amazon rainforest – only 40 kilometres (25 mi) away – is barely discernible from the summit of Quelccaya.[9] Lake Titicaca is 120 kilometres (75 mi) south of Quelccaya.[10] Administratively, Quelccaya is part of the Cuzco Department.[11]

The Andes in Peru, Ecuador, and Bolivia are subdivided into several separate mountain ranges, many of which are glaciated above 5,000 metres (16,000 ft) elevation; Peru contains about 70% of all tropical glaciers.[12][13] Together with the Coropuna volcano also in southern Peru and ice bodies in New Guinea and the Rwenzori Mountains in Africa, Quelccaya is one of the few tropical ice caps in the world;[14][15][16] during glacial times there were more ice caps which may have resembled Quelccaya.[17] The existence of two smaller ice caps south of Quelccaya was reported in 1968.[18]

Human geography Edit

The ice cap lies in a remote area.[10] It is also known as Quenamari and is sometimes spelled Quelcaya.[19][20] Since 2020, Quelccaya is part of the Área de Conservación Regional Ausangate, a protected area,[21] and the local population considers Quelccaya an important apu, a holy spirit.[22][23]

The region around the ice cap is sparsely populated.[24] The city of Cuzco lies 130 kilometres (81 mi) to the northwest of Quelccaya, and Sicuani is 60 kilometres (37 mi) to the southwest.[25][26] The closest road is still 40 kilometres (25 mi) from the ice cap and the rest of the journey can take three days with pack animals to reach the ice cap.[27] There are several camps at Quelccaya,[28] including one close to the northwestern ice margin.[29] A 1974 map shows a homestead on the Huancané River southwest from Quelccaya, about 12 kilometres (7.5 mi) from the ice margin.[30][31]

Ice cap Edit

The Quelccaya ice cap[a] extends up to 17 kilometres (11 mi) from the north to south and between 3 and 5 kilometres (1.9 and 3.1 mi) from east to west.[27] Quelccaya is a low-elevation ice cap that rises above the surrounding terrain;[13][33] the ice cap lies at 5,200–5,700 metres (17,100–18,700 ft) elevation.[34] The highest summit in the area of the ice cap is Joyllor Puñuna at 5,743 metres (18,842 ft) elevation.[5] Snowline elevation has been estimated at 5,250–5,300 metres (17,220–17,390 ft).[35]

The ice forms a relatively thin and flat structure with several ice domes.[b][28][36] The number of ice domes is variously considered to be two, three or four;[30][36][37] the highest of which reaches 5,645 metres (18,520 ft) elevation.[37] Close to the summit of the ice cap the ice is 100–150 metres (330–490 ft) thick,[38] with a maximum thickness of about 200 metres (660 ft),[30] and as of 2018 the ice has a total volume of over 1 cubic kilometre (0.24 cu mi).[39]

Between 1975 and 2010, Quelccaya covered a median area of 50.2 square kilometres (19.4 sq mi). It has decreased over time,[13] and by 2009 it had shrunk to 42.8 square kilometres (16.5 sq mi) making it smaller than the ice on Coropuna,[40][41] which is not declining as quickly.[42] Before this decline, Quelccaya was considered the largest ice area of the tropics.[40]

The ice flows radially outward from the cap.[43] Ice cliffs reaching heights of 50 metres (160 ft) form most of the margin of Quelccaya.[10][30] They often display banded layers that are 0.5–1 metre (1 ft 8 in – 3 ft 3 in) thick,[44][31] and there are flutes or grooves and icicles.[45] Over interfluves, the border of the ice cap is embayed; that is, the borders of the ice cap retreat above the areas between outlet valleys or glaciers.[46] On the southern and western sides, parts of the ice cap end at steep cliffs like those in polar regions.[30][47] From the icefalls, short glaciers up to 2 kilometres (1.2 mi) long[48] descend to elevations of 4,900–5,100 metres (16,100–16,700 ft), with lower elevations reached on the eastern side.[14][30][37] The largest of these glaciers is the Qori Kalis Glacier,[10] which extends from the northern sector of Quelccaya westwards.[1][49] There is a contrast between lobe-like glaciers that emanate into the shallow valleys of the south-western side of Quelccaya and steeper glaciers with crevasses that descend into deeper valleys elsewhere around the ice cap.[50] On the southern side, the ice cap ends in four cirques with icefalls at their head and four sets of moraines downstream.[51] Melting at Quelccaya occurs at the bottom,[52] and meltwater is discharged at the margins.[53] At the top of the ice cap, most ice loss is due to sublimation.[54]

 
View of Quelccaya from the south in 2012

Physical structures Edit

Conditions on the ice cap are polar,[18][55] and the ice surface has structures such as penitentes[c] and sastrugi.[18][56] Penitentes occur especially at lower elevations on the ice cap;[56] at higher elevations they become smaller and eventually vanish, replaced with plate-shaped ice crystals measuring 0.5–1 centimetre (0.20–0.39 in). Towards the summit, the plates are replaced with column- or less commonly needle-shaped crystals, and eventually by dendritic crystals on the summit.[57] On the summit there are lenses of ice, probably from melting.[58]

Reconnaissance in 1974–1977 found glacier caves in the Quelccaya ice cap,[59] including elongated caves where the ice has overrun an obstacle thus creating an empty space,[14] and crevasse-associated caves that form when they roof over.[60][61] Caves have fluted walls and contain cave corals, flowstones, stalactites and stalagmites;[14][61] these cave formations are made out of ice.[62]

Physical-chemical traits Edit

The ice cap contains temperate ice.[d][63][64][65] In 2003 the ice had similar temperatures throughout its thickness[66] while a 1978 publication reported temperatures in the ice and its density increased with depth.[31][67] Temperatures of the glaciers at the base of Quelccaya reach the pressure melting point, except at some locations.[68] Radar data indicate the presence of water pockets in the ice.[65]

The ice of Quelccaya does not appear to have been particularly erosive during the late Holocene, as indicated by the preservation of plant remains below it.[69] The ice cap may have been in a temperate and erosive state when it was retreating (such as during the early Holocene), and cold-based and thus not very erosive during the expansion of the late Holocene.[70][71] Cold-based glaciers do not produce much meltwater and do not erode the ground they rest on as they fluctuate.[72]

Especially during the dry season, iron, silica and sodium accumulate on the ice cap in the form of microparticles; most of these microparticles originate in the Altiplano area of the Andes and possibly the sea.[73] Sulfate and nitrate are also found and may originate in the Amazon;[74] their concentrations at Quelccaya resemble these of snow in Andean regions.[75] Particles are coarser when they are deposited during the wet season, perhaps due to wet-season storms.[25] Diatoms, insects, their bodyparts and pollen have also been found in the ice.[76][77][78] The composition of the ice may be influenced by the precipitation type.[79]

During winter, most solar radiation is reflected off the ice, with an albedo (reflectivity) of 80%.[80] As reported in 1979, 1981 and 2013, there is little energy available at the top of the Quelccaya ice cap as outgoing and incoming radiation are essentially balanced.[44][81][82][83] This radiation pattern, along with temperature and wind, influence the appearance of the surface of the Quelccaya ice.[84] Away from the ice cap, solar radiation is capable of quickly evaporating any snow.[85]

Geomorphology Edit

The plateau that Quelccaya rises from features smooth bedrock with a slope from the northeast to the southwest but is relatively flat, such that even a small rise in the freezing level will result in a large change in the ice.[1][10] The plateau is surrounded by land forms known as escarpments and a number of valleys emanate from the plateau.[15][86]

On the western side of Quelccaya these valleys include, from northwest of the ice cap southward, the Qori Kalis valley, Challpa Cocha valley,[87] Huancané valley, and "South Fork"[e] valley.[87] The Huancané valley is 0.5 kilometres (0.31 mi) wide and flat and has the "South Fork" valley as a tributary.[38] The Huancané valley runs southwestwards away from Quelccaya and is occupied by the Huancané River.[88][89] Moraines from glaciers lie in the valleys radiating from the ice cap and contain alluvial deposits and peat bogs, ponds and wetlands within depressions.[47][90][91] Clay and peat are also found incorporated in moraines; they crop out where floods have eroded into moraines.[50][92] Blocky boulders with sizes of up to 7 metres (23 ft) dot the valley floors.[38] In some places, glaciers have likely quarried the underlying rocks.[93]

West of Quelccaya lies a high plain that is formed by glacial outwash and till.[37] The terrain features landforms such as drift deposits, lakes, moraines and moraine-dammed lakes, outwash fans, peat bogs,[37][94][95] rocks bearing glacial striations, streams and wetlands.[70][95][96]

A number of lakes occur in the region of Quelccaya and the Cordillera Vilcanota, including Sibinacocha south of the Cordillera Vilcanota. Among the lakes close to the Quelccaya ice cap area:[97]

  • Laguna Accocancha/Aconcancha and Laguna Paco Cocha upvalley from Aconcancha both south of the Huancané valley.[98][99][100]
  • Challpacocha west-southwest from Qori Kalis; it is a tarn lake that receives meltwater from Quelccaya through several channels that flow through wetlands.[91][95]
  • Churuyo southwest from Quelccaya.[98]
  • Lado del Quelccaya, Lado del Quelccaya 2 and Laguna 5 due west.[97]
  • North Lake, Base Camp Lake and Boulder Lake west of Quelccaya. These three lakes lie at 5,100–5,200 metres (16,700–17,100 ft) elevation and formed within bedrock depressions when the glaciers retreated.[1]
  • Pegador Pond west-northwest from the ice cap.[97]
  • "Yanacocha" in the "South Fork" valley west of Quelccaya.[26][101] It also is a tarn lake[91] and developed in a formerly glaciated basin below an ignimbrite headwall. It currently forms a separate watershed from Quelccaya as it does not receive meltwater.[26]

Geology Edit

Quelccaya lies on a plateau formed by ignimbrites and welded tuffs,[30][37] which are of rhyolitic composition although the occurrence of andesite has also been reported.[38][102] The rocks were emplaced during the Miocene six million years ago and only little erosion has taken place since then.[38][103] The volcanics may correlate with the Quenamari volcanics farther east.[104] West of Quelccaya a Holocene normal fault runs in north–south direction, part of the Ocongate fault system;[105] this fault system extends across the Cordillera Vilcanota and has offset moraines, indicating it is active.[106][107]

Climate Edit

Annually, about 1,150 millimetres (45 in) of snow water equivalent accumulate on Quelccaya,[10] in the form of graupel,about 2–3 metres (6 ft 7 in – 9 ft 10 in) snow[f] with rainfall sometimes occurring near its margins and also near its summit.[109][110][111] This is much wetter than most of the tropical Andes, a consequence of Quelccaya's proximity to the Amazon.[38] This moisture originates from the Amazon and the Atlantic Ocean and is transported to Quelccaya by trade winds; a temperature inversion and blocking effects of coastal topography prevent moisture from the Pacific Ocean from reaching the ice cap.[1][112]

Most precipitation falls in austral summer during the summer monsoon,[113] when high insolation leads to intense convection and showers.[111] The location of the ice cap also generated orographic precipitation[114] – a type of precipitation forced by the ascent of air over mountains.[115] Most snowfall occurs during the passage of cold fronts and cold air inclusions; the net amount depends on the duration of the wet season.[116][117][118] Most precipitation falls in the afternoon, but a second phase occurs during the night.[108]

Unlike precipitation, temperatures are relatively stable throughout the year with day–night temperature differences exceeding seasonal ones.[10][48] Temperatures at the top of Quelccaya are inferred to be between −4.8 °C (23.4 °F) and −4.2 °C (24.4 °F). For the margin of Quelccaya, mean temperatures have been inferred under the assumption that the lapse rate[g] is constant. Varying between −6.3 and 0.9 °C (20.7 and 33.6 °F), the mean temperature at the margin is −3.3 °C (26.1 °F) during the dry season. During the wet season it varies between −3.1 and 2.9 °C (26.4 and 37.2 °F) with a mean of −0.5 °C (31.1 °F).[1][37] As a consequence of global warming, temperatures on the summit of Quelccaya sometimes rise above freezing, accelerating the shrinkage of the ice cap.[36][120]

Winds are strongest during the day and mostly blow from the west, except during the rainy season when they also come from the east or north-east.[121][122] The ice cap itself generates its own downslope katabatic wind, which blows over the ice and quickly peters out with distance from the ice margin.[123]

Climate variability Edit

The climate is influenced by the El Niño-Southern Oscillation and by the position of the Intertropical Convergence Zone;[26][124] during El Niño years precipitation is much less as westerly winds suppress the transport of easterly moisture to Quelccaya.[26][113] During the strong 2014–2016 El Niño event, there was a net decrease in snow height on Quelccaya.[125] Further, during El Niño there is a "front-loading" of precipitation with an earlier onset of the monsoon and decreased precipitation in its middle and late phase.[126] Temperatures are also modulated by El Niño events, during which an increase is observed although winter temperatures decrease.[125][126][127]

Ice cores show evidence of past climate variability, such as increased precipitation in the years 1870–1984, 1500–1720, 760–1040 and with drought in the years 1720–1860, 1250–1310, 650–730, 570–610 and 540–560.[128] One of these wet periods has been correlated to the Medieval Climate Anomaly 1,000–700 years ago,[129] while drought periods have been linked to cultural changes in the Peruvian Moche culture and the collapse of the pre-Columbian Tiwanaku empire.[130][131] Apart from precipitation, climate at Quelccaya has been stable over the past 1500 years.[132] During recent decades, precipitation has not fluctuated significantly[13] but temperatures have been steadily increasing.[127]

Vegetation and animal life Edit

 
The white-winged diuca finch nests on Quelccaya.
 
The white-fronted ground tyrant nests on Quelccaya.

The terrain west of Quelccaya is sparsely vegetated with high elevation tundra vegetation.[26][133] The vegetation in the region is known as puna grassland;[134][48] above 4,300 metres (14,100 ft) elevation it is defined as "super-Puna", and consists of herbs and shrubs such as Plantago and trees like Polylepis which grow to the ice cap and often have a krummholz appearance.[135] The main human use of the area is livestock grazing but crop planting has also been reported.[26][136]

There are over fifty plant species in the terrain around the ice cap.[136] Aquatic plants are found in lakes.[91] The glacial runoff and precipitation guarantee an ample water supply, leading to the development of wetlands known as bofedales and peat;[38] The cushion plant Distichia muscoides is the dominant plant in the bofedales and these wetlands are hotspots of biodiversity,[28][91][137] but tussock grasses have been expanding in the wetlands as ice retreats.[137] Other plants include Festuca orthophylla (a grass), Jarava ichu (Peruvian feathergrass) and nettles.[22] Twenty-three lichen species have been identified growing on rocks at Quelccaya.[133][136]

Among animals are 60 species of birds,[28] while mammals in the surrounding region include Andean foxes, Andean mountain cats, deer, vicuñas and vizcachas,[22][138] and amphibians and water fleas occur in lakes.[91][136] Two birds,[139] the glacier finch and the white-fronted ground tyrant are known to nest on the Quelccaya ice cap,[139][140] mostly within cavities in the ice that are barely accessible to humans.[139] The finch is known to nest on ice elsewhere in the tropical Andes,[111] and other bird species might also nest on the Quelccaya ice.[137] Other than these finches, only emperor penguins are known to nest on ice; ice is an ill-suited environment for the raising of young birds and Quelccaya presents additional challenges linked to its high elevation.[11][28] Other birds nest in protected locations in the general Quelccaya area and some species also roost on the ice.[141]

Scientific research and monitoring Edit

Glaciers in the region have been monitored since the 1970s. Sediment cores in lakes and peat and cosmogenic isotope dating have been used to infer past states of the ice cap,[49] and since 1976 Quelccaya is regularly reconnoitered.[142] An automated weather station that records meteorological parameters was installed in 2003 and reinstalled in 2004 after vandalism,[143] and snow is sampled annually although continuous precipitation records do not exist.[13][113] The American paleoclimatologist Lonnie Thompson and the Ohio State University (OSU) have been monitoring Quelccaya since 1974 and the ice cap has been investigated for its glaciology and for both its past and present climate.[144][145]

Ice cores Edit

The layered appearance of the Quelccaya ice cap at its margins suggested to scientists that the ice cap could be used to obtain ice cores with annual resolution.[146] After a summer field program that lasted between 1976 and 1984,[147] in 1983 Thompson and the OSU team obtained two ice cores that were 163.6 metres (537 ft) and 154.8 metres (508 ft) long[h] from the central area of the ice cap.[29][43][149] The ice cores were drilled with the help of a solar-powered ice drill specifically developed for Quelccaya because other power sources could not be brought onto the ice cap.[43][150] These ice cores were investigated by the OSU Byrd Polar Research Center.[151] They cover a timespan of 1,500 and 1,350 years, with the longer ice core going back to 470 AD.[43][148][152] Another, shorter ice core measuring 15 metres (49 ft) in length and spanning 8 years was obtained in 1976; others followed in 1979, 1991, 1995 and 2000.[142]

Dust layers deposited during the dry season allow the determination of yearly layers,[43][153] which characteristically thin downward.[81] Volcanic ash deposited by the 1600 Huaynaputina eruption has been used to date the ice cores;[154][155] in turn the volume of the eruption was reconstructed from the ash thickness in the ice core.[156]

A number of research findings have been made with the Quelccaya ice cores:

  • The ice cores contain annually resolved oxygen isotope ratio variations. During the past millennium, the oxygen isotope ratios recorded at Quelccaya have resembled these found in other tropical South American and also Tibetan ice cores.[72][157] While originally proposed to reflect temperature variations, the oxygen isotope ratios have also been assumed to reflect atmospheric circulation and temperatures in the Pacific Ocean and tropical North Atlantic.[120][158]
  • Oxygen isotope ratio variations record the Little Ice Age,[159] which clearly stands out in the Quelccaya ice core record.[160] The Quelccaya record was used to infer that the Little Ice Age was a global event,[161] and that temperature and precipitation variations took place during the Little Ice Age. An early wet phase occurred between 1500 and 1720 and a late dry phase between 1720 and 1880.[159][162] At the ice cap, the Little Ice Age ended relatively suddenly around 1880.[163]
  • The oxygen isotope ratios also vary during El Niño years and the ice cores have been employed to make a record of ENSO events.[75][126] The 1976 and the 1982–1983 El Niño events have been identified in the ice cores.[164]
  • A correlation between precipitation on the ice cap with water levels in Lake Titicaca and traces of the severe drought between 1933 and 1945 have been found in the ice core record of Quelccaya.[165][166]
  • Other climate events recorded at Quelccaya are the 1815 eruption of Indonesia's Mount Tambora and the 536 climate downturn.[167][168]
  • Additional findings in the ice cores are dust clouds generated by earthquakes in the dry Atacama and Pacific coast of Peru,[169] dust correlated to droughts, traces of the Suess cycle which is a solar cycle,[170][171] evidence of Inka and Spanish industrial activity in South America, and finally of agriculture around Lake Titicaca.[165][172]

The Quelccaya ice cores are widely used to reconstruct past climate states.[173] Quelccaya was the first ice cap outside of the polar regions from which old ice cores were obtained,[34][174] and is the site of the first annually resolved ice core record from the tropical Andes; it demonstrated the usefulness of tropical ice for ice core studies[120][175] and the taking of these cores has been called a "major step" in the sampling of high elevation ice in the world.[176] Quelccaya was selected as a site for extra-polar ice core research as it is located in the sparsely investigated tropics and lies at a higher elevation than Puncak Jaya in Indonesia or the Rwenzori Mountains in Africa; thus the ice is less disturbed by percolating meltwater.[44] Because of the lack of seasonal temperature variations and of synoptic weather patterns, tropical glaciers may primarily record secular climate change.[10] The dome-like shape and the low elevation range of the Quelccaya Ice Cap result in large responses of ice extent to relatively small changes in the equilibrium line altitude.[i][178]

Natural history Edit

Moraines deposited by older glaciers indicate that during the Pleistocene and Holocene glaciers extended over larger surfaces,[49] covering the area with sandy drift derived from ignimbrites.[89] The ice extended over the outwash- and till-covered plain west of Quelccaya and connected with the Cordillera Vilcanota ice cap.[179][180] During the maximum extent the ice reached down to elevations of 4,500 metres (14,800 ft) as the equilibrium line altitude decreased by 360 metres (1,180 ft);[181] this change in the equilibrium line altitude is considerably less than the decrease found elsewhere in the Peruvian Andes and may reflect topographical controls on glacier expansion.[182][183] The connection with the Vilcanota ice cap may have occurred during the last glacial maximum.[35]

No direct evidence of glacier expansions in times preceding marine isotope stage 4 remain although an early glaciation of Quelccaya had ice advance to twice the distance it assumed during the Wisconsin glaciation.[14][184] Maximum extent occurred either about 20,000 years ago or between 28,000 and 14,000 years ago.[j] The maximum extent occurred during the Weichselian/Wisconsin glaciation and within marine isotope stage 2.[182][183][185][186]

By 13,600–12,800 years ago Quelccaya had retreated concomitant with global glacier shrinkage at the end of the last glacial maximum. A readvance occurred 12,500 years ago, linked to a colder and wetter climate during the Younger Dryas. Retreat recommenced 12,400 years ago and by 11,800–11,600 years ago the ice cap had reached an extent like during the Little Ice Age and modern times.[187][188] Another proposed chronology indicates a glacier expansion beginning 13,300 years ago and ending by 12,900 years ago, with Quelccaya reaching a size not much larger than during the Holocene by 12,800 years ago.[189] A final scenario envisages an advance between 12,700 and 11,000 years ago.[190] There might have been two readvances, one in the early Younger Dryas and the other around 12,600 years ago.[191] A halt in retreat or an actual advance of Quelccaya may or may not have occurred at the same time as the former Lake Tauca existed on the Altiplano,[k] and it is possible that the retreat occurred during the middle Younger Dryas.[191][193]

Holocene Edit

During the Holocene, Quelccaya did not expand farther than 1 kilometre (0.62 mi) from its present position and early Holocene moraines have not been found.[194][195] It is possible that during the mid-Holocene Quelccaya was ice-free altogether;[196] peat deposits and ice cores indicate that it was reduced or even absent then.[197] Until either 7,000 years ago or between at least 7,000 years ago and about 5,000 years ago, plants grew at its margins,[178][198][199] including cushion mire vegetation judging by exposed remains. This shrinkage may relate to a warmer and drier climate at that time.[199][200]

The ice cap began to grow again at a time of global climate change, 5,000 years ago, which included the drying of the Sahara at the end of the African humid period and wetter and colder conditions in the extratropics.[201][202] This re-expansion was part of the global neoglacial glacier expansion;[203] this pattern of a larger ice cap during the late Holocene than the early is similar to that of Northern Hemisphere glaciers and may reflect Northern Hemisphere insolation.[70] A similar history of early Holocene shrinkage followed by late Holocene expansion has been noted at the Rwenzori Mountains in Africa. The ice cap reached its Holocene maximum extent during the Little Ice Age.[204][205]

About 4,000 years ago, a new retreat occurred under the influence of warmer and drier climates,[206] and another shrinkage also occurred between 3,000 and 1,500 years ago.[207] Alternatively, 3,400 and 1,500 years before present the ice cap may have extended 1 kilometre (0.62 mi) past its current limit, and about 0.8 kilometres (0.50 mi) past its limit 1,600 years ago.[208]

Chronology at Huancané and Qori Kalis Edit

Multiple moraines have been dated in the Huancané valley.[37] Three separate glacial stages have been identified here: H1 (the shortest), H2 and H3 (the longest).[99] They have left moraines 8 kilometres (5.0 mi), 4 kilometres (2.5 mi) and 1 kilometre (0.62 mi) from the 2002 ice margin and are also known as Huancane I, Huancane II and Huancane III, names which are sometimes applied to the glacial advances themselves.[100][209] The moraines in the valley are terminal moraines and consist of sets of ridges up to 1 kilometre (0.62 mi) wide.[35][210] Boulders found on the Huancane III moraines have fresher appearances than these on the other moraines.[89] Huancane III has also been subdivided into Huancane IIIa, IIIb and IIIc and Huancane II into Huancane IIa, IIb and IIc.[38][94] These are all regressional moraines, as by the time of the emplacement of Huancane moraines, Quelccaya was shrinking and was already disconnected from the ice on the Cordillera Vilcanota.[211][212] Finally, there is a set of moraines farther down the Huancané valley that appears to be the oldest.[213] Equivalents of the Huancane moraines have been identified outside of the Huancané valley.[36]

  • Huancane III appear to be a last glacial maximum stand or a stand just after the last glacial maximum such as Heinrich event 1 although its age is not well known.[38][214][215]
  • Huancane II appear to have formed during a post-last glacial maximum advance.[215] One view sees Huancane II as preceding the Younger Dryas and perhaps connected to the Antarctic Cold Reversal;[188][216][217] another one assumes that Quelccaya was smaller during the Antarctic Cold Reversal and that Huancane II formed during the Younger Dryas,[38][187] and a final one that Huancane II was a localized glacier advance.[218]
  • Huancane I moraines are less than 1,000 years old and reflect the Little Ice Age extent of the Quelccaya ice cap which at Quelccaya occurred between about 1490 and 1880.[86][219][220] They also record expansions that occurred 1,000, 600, 400 and 200 years ago.[92] Huancane I moraines are found all around Quelccaya, and noticeable Little Ice Age moraines are also found in front of the outlet glaciers on the southeastern side of Quelccaya.[197][221]

About 16 late Holocene moraines are also found downstream of Qori Kalis glacier,[34] with the largest advance occurring before 520±60 years ago, followed by a progressive retreat and a readvance about 350–300 years ago. Similar glacier advance and retreat patterns have been observed in the Cordillera Blanca and Cordillera Vilcabamba in Peru, the Bolivian Andes and also in Patagonia and New Zealand and appear to reflect cold climate oscillations.[222]

Implications Edit

Estimating the ages of moraines is difficult. A retreating glacier will deposit successive moraines but an advancing one can destroy older moraines less extensive than the glacier advance. Dates obtained from organic material behind a moraine may be considerably younger than the moraine as its development occurs with a lag from deglaciation, while organic matter in or underneath a moraine may be considerably older.[223] Changes in sediment fluxes to lakes west of Quelccaya appear to reflect advances and retreats of glaciers, with meltwater formed during retreats increasing sediment fluxes.[224]

The extent of the Quelccaya ice cap does not appear to correlate with the amount of precipitation occurring on the ice cap except in particular cases;[222] temperature effects appear to dominate and warmer and wetter climates have been associated with retreat.[220][225] This dominance of temperature over precipitation in determining ice cap size and glacier length has been replicated by modelling.[226] Interannual climate variability does not have substantial effects on the extent of the ice cap.[227]

Present retreat Edit

 
A proglacial lake at Quelccaya

The glaciers are melting at increasing rates, with rapid deglaciation underway during the late 20th century at a rate that is comparable to or exceeds that of postglacial retreat rates.[228] Between 1980 and 2010, the ice cap shrank at a rate of 0.57 ± 0.1 square kilometres per year (0.220 ± 0.039 sq mi/a) with a loss of 30% of its area between 1979 and 2014.[229][230][231] Between 1990 and 2009, a southeastern branch of the ice cap disappeared altogether.[232] At the northwestern and southeastern ends of the ice cap, the retreat has reached the plateau that Quelccaya sits on.[71] Additionally, parts of the northwestern ice cap have separated from the main ice body and by 2011 the retreat had reduced Quelccaya to a size smaller than at any other time in the past 6,000 years.[233][234] There is some variation between retreat rates measured by different researchers as the Quelccaya ice cap is differently defined and due to differences between extents measured in seasons with and without snow cover.[235] True fluctuations also occur, such as an advance of part of Quelccaya's southern margin reported in 1977 which bulldozed peat deposits,[17][236] a pause of the Qori Kalis glacier between 1991 and 1993 probably linked with the global cooling caused by the Philippine Pinatubo eruption in 1991,[237] a slow-down in the mid-2000s and an overall higher rate of retreat since 2000.[238]

The Qori Kalis outlet glacier has been observed since 1963, and between 1963 and 1978 retreated by about 6 metres per year (20 ft/a) and between 1991 and 2005 by about 60 metres per year (200 ft/a).[1][34] The retreat has been accompanied by a volume loss of the ice cap, increasing from 290,000 cubic metres per year (10,000,000 cu ft/a) between 1963 and 1978 over 1,310,000 cubic metres per year (46,000,000 cu ft/a) between 1978 and 1983 to 2,200,000 cubic metres per year (78,000,000 cu ft/a) between 1983 and 1991.[49] The rate of retreat is higher than at the end of the last ice age and the glacier responds quickly to climate alterations.[9]

Similar retreats have been observed at other tropical glaciers, and are linked to the increase in global temperatures caused by industrial greenhouse gas emissions.[2][4] This warming is unprecedented by the standards of the late Holocene.[239]

Consequences Edit

Meltwater lakes[233] and proglacial lakes have formed in front of Qori Kalis glacier and other Quelccaya glaciers and expanded in size.[71][235][240][241] These lakes could be sources of future glacial lake outburst floods, although the sparse population of the area means that potential damages caused by these floods would be lessened.[242] Two such floods occurred in March 2006 and December 2007, caused property damage and killed livestock.[241] In addition, some lakes have drained and the course of streams has changed as the glaciers have retreated.[243]

The freezing level regularly rises above the summit of Quelccaya, and in recent ice cores, meltwater infiltration has become apparent.[52][244] Consequently, oxygen isotope ratios are no longer preserved in the ice; while this infiltration has smoothened the record only to a certain depth,[245][246][247] it illustrates the threat that climate change is creating for the existence of climate archives in ice cores.[248] Alpine life is quickly advancing into the terrain left by ice,[136] and the retreat has exposed plant remains that had been overrun during a glacier expansion that occurred 5,000 years ago.[202]

Projections Edit

Projected climate change is expected to involve a further 3–5 °C (5.4–9.0 °F) warming in the central Andes, with higher warming occurring at higher elevations.[229] In the RCP8.5 climate change scenario,[l] during the 21st century the equilibrium line altitude will rise above the top of the ice cap and thus the entire cap will become a zone of net ice loss and Quelccaya will disappear. In scenarios that include aggressive mitigation measures, the ice cap may persist, while intermediate scenarios predict a loss of the ice cap in the 22nd century.[250][251] There is some uncertainty owing to, for example, changes in precipitation, including any potential future decrease.[252][253]

Hydrology and significance Edit

Glacial meltwater is an important source of water especially in dry years and during the dry season,[4] including in the Altiplano and in the hyperarid coasts of Peru.[239] For example, about 80% of Peru's hydropower sources are buffered by glacial meltwater.[254] Avalanches and floods from glaciers have killed over 35,000 people and glacial retreat will likely increase their incidence.[145][239] Enhanced melting may be contributing to streamflow, and past meltwater flows might have contributed to the formation of large lakes in the Altiplano.[4]

Most of Quelccaya borders on the Inambari River watershed, especially on the east and south; the western parts of the ice cap border on the Vilcanota River/Urubamba River catchment[m] of which it is an important part.[256][257] Clockwise from the northwest the Rio Chimboya, the Quebrada Jetun Cucho, the Quebrada Queoñani, the Rio Quelcaya Mayu, an unnamed river, the Rio Huancané, the Rio Ritiananta and the Quebrada Accoaysana Pampa emanate from the ice cap. The first four rivers eventually converge into the westward flowing Rio Corani, a tributary of the northward-flowing Rio Ollachea/Rio Sangabán which eventually ends into the Inambari River;[258][259] the last four rivers eventually converge into the southwards-flowing Rio Salcca, which then turns west and ends into the Vilcanota River.[258][260] Some of the valleys that drain southeastward, northeastward and west-northwestward from Quelccaya can be affected by glacier-related floods.[261]

Quelccaya is the largest glacierized area in the watershed of the San Gabán hydropower plant and also of the catchment Rio Vilcanota watershed;[257][262] its water is used by the Cusco Region.[145] The water is used for both irrigation and hydropower production. The population in the region is for the most part rural with low socioeconomic status, and as such is highly vulnerable to the effects of climate change. Additionally, glaciers have important religious and social value for the local communities.[253]

Notes Edit

  1. ^ It has also been compared to a plateau glacier.[32]
  2. ^ Dome-shaped parts of the ice cap.[36]
  3. ^ Inclined boards or sheets of snow.[56]
  4. ^ Meaning that ice temperatures below 10 metres (33 ft) depth reach 0 °C (32 °F).[63]
  5. ^ Informal name;[38] Huancané is sometimes called North Fork Huancané.[87]
  6. ^ Graupel - snow crystals with much rime - is common.[108]
  7. ^ The rate at which temperature declines with elevation.[119]
  8. ^ Reaching the bedrock[148]
  9. ^ The equilibrium line altitude is the elevation on an ice body where the annual ice accumulation and ice loss balance each other.[177]
  10. ^ Different sources give different ages.[183][185]
  11. ^ Approximately 17,500–15,000 years ago.[192]
  12. ^ RCP8.5 is an extreme greenhouse gas emissions scenario with unmitigated increases in greenhouse gas emissions. It is not the most likely scenario, given the decrease in some high-greenhouse gas emission energy sources such as coal.[249]
  13. ^ Sometimes it is also stated that Lake Titicaca receives water from Quelccaya[255] but watershed maps show Quelccaya bordering on the Inambari River and Vilcanota River watershed, both of which drain to the Atlantic Ocean.[256]

See also Edit

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  • Sandeman, Hamish A.; Clark, Alan H.; Farrar, Edward; Pauca, Guido Arroyo (1 May 1997). "Lithostratigraphy, petrology and 40Ar-39Ar geochronology of the Crucero Supergroup, Puno department, SE Peru". Journal of South American Earth Sciences. 10 (3): 223–245. Bibcode:1997JSAES..10..223S. doi:10.1016/S0895-9811(97)00023-0. ISSN 0895-9811.
  • Seimon, Anton (2003). "Improving climatic signal representation in tropical ice cores: A case study from the Quelccaya Ice Cap, Peru". Geophysical Research Letters. 30 (14): 1772. Bibcode:2003GeoRL..30.1772S. doi:10.1029/2003GL017191. ISSN 1944-8007.
  • Seltzer, Geoffry O. (1 January 1990). "Recent glacial history and paleoclimate of the Peruvian-Bolivian Andes". Quaternary Science Reviews. 9 (2): 137–152. Bibcode:1990QSRv....9..137S. doi:10.1016/0277-3791(90)90015-3. ISSN 0277-3791.
  • Shimada, Izumi; Schaaf, Crystal Barker; Thompson, Lonnie G.; Mosley-Thompson, Ellen (1991). "Cultural Impacts of Severe Droughts in the Prehistoric Andes: Application of a 1,500-Year Ice Core Precipitation Record". World Archaeology. 22 (3): 247–270. doi:10.1080/00438243.1991.9980145. ISSN 0043-8243. JSTOR 124787.
  • Smith, Jacqueline A.; Seltzer, Geoffrey O.; Rodbell, Donald T.; Klein, Andrew G. (1 September 2005). "Regional synthesis of last glacial maximum snowlines in the tropical Andes, South America". Quaternary International. 138–139: 145–167. Bibcode:2005QuInt.138..145S. doi:10.1016/j.quaint.2005.02.011. ISSN 1040-6182.
  • Stansell, Nathan D.; Rodbell, Donald T.; Abbott, Mark B.; Mark, Bryan G. (15 June 2013). "Proglacial lake sediment records of Holocene climate change in the western Cordillera of Peru". Quaternary Science Reviews. 70: 1–14. Bibcode:2013QSRv...70....1S. doi:10.1016/j.quascirev.2013.03.003. ISSN 0277-3791.
  • Stroup, Justin S.; Kelly, Meredith A.; Lowell, Thomas V.; Smith, Colby A.; Beal, Samuel A.; Landis, Joshua D.; Tapia, Pedro M. (2015). "Late Holocene fluctuations of Quelccaya Ice Cap, Peru, registered by nearby lake sediments". Journal of Quaternary Science. 30 (8): 830–840. Bibcode:2015JQS....30..830S. doi:10.1002/jqs.2821. ISSN 1099-1417. S2CID 131665228.
  • Thompson, Lonnie G.; McKenzie, Garry D. (January 1979). "Origin of Glacier Caves in the Quelccaya Ice Cap, Peru" (PDF). The NSS Bulletin. National Speleological Society. 41 (1): 11–14. ISSN 1090-6924.
  • Thompson, Lonnie G. (1980). "Glaciological Investigations of the Tropical Quelccaya Ice Cap, Peru*". Journal of Glaciology. 25 (91): 69–84. doi:10.3189/S0022143000010297. ISSN 0022-1430.
  • Thompson, L. G.; Mosley-Thompson, E.; Grootes, P. M.; Pourchet, M.; Hastenrath, S. (1984). "Tropical glaciers: Potential for ice core paleoclimatic reconstructions". Journal of Geophysical Research. 89 (D3): 4638. Bibcode:1984JGR....89.4638T. doi:10.1029/JD089iD03p04638.
  • Thompson, Lonnie G.; Mosley-Thompson, Ellen (1987). Berger, W. H.; Labeyrie, L. D. (eds.). Evidence of Abrupt Climatic Change During the Last 1,500 Years Recorded in Ice Cores from the Tropical Quelccaya Ice Cap, Peru. pp. 99–110. doi:10.1007/978-94-009-3993-6_9. ISBN 9789401082723. {{cite book}}: |work= ignored (help)
  • Thompson, Lonnie G. (1 January 2000). "Ice core evidence for climate change in the Tropics: implications for our future". Quaternary Science Reviews. 19 (1): 19–35. Bibcode:2000QSRv...19...19T. doi:10.1016/S0277-3791(99)00052-9. ISSN 0277-3791.
  • Thompson, Lonnie G.; Mosley-Thompson, Ellen; Henderson, Keith A. (May 2000). "Ice-core palaeoclimate records in tropical South America since the Last Glacial Maximum". Journal of Quaternary Science. 15 (4): 377–394. Bibcode:2000JQS....15..377T. doi:10.1002/1099-1417(200005)15:4<377::AID-JQS542>3.0.CO;2-L.
  • Thompson, L. G.; Mosley‐Thompson, E. (2013). "One-Half Millennia of Tropical Climate Variability as Recorded in the Stratigraphy of the Quelccaya Ice Cap, Peru". Aspects of Climate Variability in the Pacific and the Western Americas. Geophysical Monograph Series. American Geophysical Union (AGU): 15–31. doi:10.1029/gm055p0015. ISBN 9781118664285.
  • Thompson, Lonnie G.; Davis, Mary E.; Mosley-Thompson, Ellen; Porter, Stacy E.; Corrales, Gustavo Valdivia; Shuman, Christopher A.; Tucker, Compton J. (1 August 2021). "The impacts of warming on rapidly retreating high-altitude, low-latitude glaciers and ice core-derived climate records". Global and Planetary Change. 203: 103538. Bibcode:2021GPC...20303538T. doi:10.1016/j.gloplacha.2021.103538. ISSN 0921-8181. S2CID 236274780.
  • Vickers, Anthony C.; Shakun, Jeremy D.; Goehring, Brent M.; Kelly, Meredith A.; Jackson, Margaret S.; Doughty, Alice; Russell, James (2020). "Similar Holocene glaciation histories in tropical South America and Africa". Geology. 49 (2): 140–144. doi:10.1130/G48059.1. S2CID 234041160.

External links Edit

  • Quelccaya Climate
  • Scaling Quelccaya: Using 3-D Animation and Satellite Data To Visualize Climate Change

October 21, 2023
quelccaya, also, known, quenamari, second, largest, glaciated, area, tropics, after, coropuna, located, cordillera, oriental, section, andes, mountains, peru, covers, area, square, kilometres, with, metres, thick, surrounded, tall, cliffs, number, outlet, glac. The Quelccaya Ice Cap also known as Quenamari Ice Cap is the second largest glaciated area in the tropics after Coropuna Located in the Cordillera Oriental section of the Andes mountains in Peru the cap covers an area of 42 8 square kilometres 16 5 sq mi with ice up to 200 metres 660 ft thick It is surrounded by tall ice cliffs and a number of outlet glaciers the largest of which is known as Qori Kalis Glacier lakes moraines peat bogs and wetlands are also present There is a rich flora and fauna including birds that nest on the ice cap Quelccaya is an important source of water eventually melting and flowing into the Inambari and Vilcanota Rivers QuelccayaQuenamariNovember 2022 satellite image of the glacier by Sentinel 2 TypeIce capLocationPeruCoordinates13 55 30 S 70 49 03 W 13 92500 S 70 81750 W 13 92500 70 81750 1 Area42 8 sq km 16 5 sq mi in 2009Length17 kmWidth3 5 kmThickness100 150 m 200 m at thickest Highest elevation5 700 mLowest elevation5 200 mStatusRetreatingA number of ice cores have been obtained from Quelccaya including two from 1983 that were the first recovered outside of the polar regions Past climate states have been reconstructed from data in these ice cores these include evidence of the Little Ice Age regional droughts and wet periods with historical significance and past and recent El Nino events The ice cap is regularly monitored and has a weather station Quelccaya was much larger in the past merging with neighbouring glaciers during the Pleistocene epoch A secondary expansion occurred during either the Antarctic Cold Reversal or the Younger Dryas climate anomalies At the beginning of the Holocene the ice cap shrank to a size smaller than present day around 5 000 years ago a neoglacial expansion began A number of moraines especially in the Huancane valley testify to past expansions and changes of Quelccaya although the chronology of individual moraines is often unclear After reaching a secondary highstand area expansion during the Little Ice Age Quelccaya has been shrinking due to human caused climate change in particular the Qori Kalis Glacier has been retreating significantly Life and lakes have been occupying the terrain left by retreating ice these lakes can be dangerous as they can cause floods when they breach Climate models predict that without climate change mitigation measures Quelccaya is likely to disappear during the 21st or 22nd century Contents 1 Geography 1 1 Human geography 2 Ice cap 2 1 Physical structures 2 2 Physical chemical traits 3 Geomorphology 3 1 Geology 4 Climate 4 1 Climate variability 5 Vegetation and animal life 6 Scientific research and monitoring 6 1 Ice cores 7 Natural history 7 1 Holocene 7 2 Chronology at Huancane and Qori Kalis 7 3 Implications 8 Present retreat 8 1 Consequences 8 2 Projections 9 Hydrology and significance 10 Notes 11 See also 12 References 12 1 Sources 13 External linksGeography EditThe Quelccaya Ice Cap lies in the tropical highlands of southern Peru in the Cordillera Oriental eastern Andes 2 3 The Cordillera Vilcanota mountain range is ten kilometres 6 2 mi northwest of Quelccaya 4 5 and Quelccaya is sometimes considered to be part of it 6 occasionally Quelccaya is also linked to the Cordillera Carabaya range 7 East of Quelccaya the Andes drop off steeply to the Amazon basin 8 The Amazon rainforest only 40 kilometres 25 mi away is barely discernible from the summit of Quelccaya 9 Lake Titicaca is 120 kilometres 75 mi south of Quelccaya 10 Administratively Quelccaya is part of the Cuzco Department 11 The Andes in Peru Ecuador and Bolivia are subdivided into several separate mountain ranges many of which are glaciated above 5 000 metres 16 000 ft elevation Peru contains about 70 of all tropical glaciers 12 13 Together with the Coropuna volcano also in southern Peru and ice bodies in New Guinea and the Rwenzori Mountains in Africa Quelccaya is one of the few tropical ice caps in the world 14 15 16 during glacial times there were more ice caps which may have resembled Quelccaya 17 The existence of two smaller ice caps south of Quelccaya was reported in 1968 18 Human geography Edit The ice cap lies in a remote area 10 It is also known as Quenamari and is sometimes spelled Quelcaya 19 20 Since 2020 Quelccaya is part of the Area de Conservacion Regional Ausangate a protected area 21 and the local population considers Quelccaya an important apu a holy spirit 22 23 The region around the ice cap is sparsely populated 24 The city of Cuzco lies 130 kilometres 81 mi to the northwest of Quelccaya and Sicuani is 60 kilometres 37 mi to the southwest 25 26 The closest road is still 40 kilometres 25 mi from the ice cap and the rest of the journey can take three days with pack animals to reach the ice cap 27 There are several camps at Quelccaya 28 including one close to the northwestern ice margin 29 A 1974 map shows a homestead on the Huancane River southwest from Quelccaya about 12 kilometres 7 5 mi from the ice margin 30 31 Ice cap EditThe Quelccaya ice cap a extends up to 17 kilometres 11 mi from the north to south and between 3 and 5 kilometres 1 9 and 3 1 mi from east to west 27 Quelccaya is a low elevation ice cap that rises above the surrounding terrain 13 33 the ice cap lies at 5 200 5 700 metres 17 100 18 700 ft elevation 34 The highest summit in the area of the ice cap is Joyllor Pununa at 5 743 metres 18 842 ft elevation 5 Snowline elevation has been estimated at 5 250 5 300 metres 17 220 17 390 ft 35 The ice forms a relatively thin and flat structure with several ice domes b 28 36 The number of ice domes is variously considered to be two three or four 30 36 37 the highest of which reaches 5 645 metres 18 520 ft elevation 37 Close to the summit of the ice cap the ice is 100 150 metres 330 490 ft thick 38 with a maximum thickness of about 200 metres 660 ft 30 and as of 2018 update the ice has a total volume of over 1 cubic kilometre 0 24 cu mi 39 Between 1975 and 2010 Quelccaya covered a median area of 50 2 square kilometres 19 4 sq mi It has decreased over time 13 and by 2009 it had shrunk to 42 8 square kilometres 16 5 sq mi making it smaller than the ice on Coropuna 40 41 which is not declining as quickly 42 Before this decline Quelccaya was considered the largest ice area of the tropics 40 The ice flows radially outward from the cap 43 Ice cliffs reaching heights of 50 metres 160 ft form most of the margin of Quelccaya 10 30 They often display banded layers that are 0 5 1 metre 1 ft 8 in 3 ft 3 in thick 44 31 and there are flutes or grooves and icicles 45 Over interfluves the border of the ice cap is embayed that is the borders of the ice cap retreat above the areas between outlet valleys or glaciers 46 On the southern and western sides parts of the ice cap end at steep cliffs like those in polar regions 30 47 From the icefalls short glaciers up to 2 kilometres 1 2 mi long 48 descend to elevations of 4 900 5 100 metres 16 100 16 700 ft with lower elevations reached on the eastern side 14 30 37 The largest of these glaciers is the Qori Kalis Glacier 10 which extends from the northern sector of Quelccaya westwards 1 49 There is a contrast between lobe like glaciers that emanate into the shallow valleys of the south western side of Quelccaya and steeper glaciers with crevasses that descend into deeper valleys elsewhere around the ice cap 50 On the southern side the ice cap ends in four cirques with icefalls at their head and four sets of moraines downstream 51 Melting at Quelccaya occurs at the bottom 52 and meltwater is discharged at the margins 53 At the top of the ice cap most ice loss is due to sublimation 54 nbsp View of Quelccaya from the south in 2012 Physical structures Edit Conditions on the ice cap are polar 18 55 and the ice surface has structures such as penitentes c and sastrugi 18 56 Penitentes occur especially at lower elevations on the ice cap 56 at higher elevations they become smaller and eventually vanish replaced with plate shaped ice crystals measuring 0 5 1 centimetre 0 20 0 39 in Towards the summit the plates are replaced with column or less commonly needle shaped crystals and eventually by dendritic crystals on the summit 57 On the summit there are lenses of ice probably from melting 58 Reconnaissance in 1974 1977 found glacier caves in the Quelccaya ice cap 59 including elongated caves where the ice has overrun an obstacle thus creating an empty space 14 and crevasse associated caves that form when they roof over 60 61 Caves have fluted walls and contain cave corals flowstones stalactites and stalagmites 14 61 these cave formations are made out of ice 62 Physical chemical traits Edit The ice cap contains temperate ice d 63 64 65 In 2003 the ice had similar temperatures throughout its thickness 66 while a 1978 publication reported temperatures in the ice and its density increased with depth 31 67 Temperatures of the glaciers at the base of Quelccaya reach the pressure melting point except at some locations 68 Radar data indicate the presence of water pockets in the ice 65 The ice of Quelccaya does not appear to have been particularly erosive during the late Holocene as indicated by the preservation of plant remains below it 69 The ice cap may have been in a temperate and erosive state when it was retreating such as during the early Holocene and cold based and thus not very erosive during the expansion of the late Holocene 70 71 Cold based glaciers do not produce much meltwater and do not erode the ground they rest on as they fluctuate 72 Especially during the dry season iron silica and sodium accumulate on the ice cap in the form of microparticles most of these microparticles originate in the Altiplano area of the Andes and possibly the sea 73 Sulfate and nitrate are also found and may originate in the Amazon 74 their concentrations at Quelccaya resemble these of snow in Andean regions 75 Particles are coarser when they are deposited during the wet season perhaps due to wet season storms 25 Diatoms insects their bodyparts and pollen have also been found in the ice 76 77 78 The composition of the ice may be influenced by the precipitation type 79 During winter most solar radiation is reflected off the ice with an albedo reflectivity of 80 80 As reported in 1979 1981 and 2013 there is little energy available at the top of the Quelccaya ice cap as outgoing and incoming radiation are essentially balanced 44 81 82 83 This radiation pattern along with temperature and wind influence the appearance of the surface of the Quelccaya ice 84 Away from the ice cap solar radiation is capable of quickly evaporating any snow 85 Geomorphology EditThe plateau that Quelccaya rises from features smooth bedrock with a slope from the northeast to the southwest but is relatively flat such that even a small rise in the freezing level will result in a large change in the ice 1 10 The plateau is surrounded by land forms known as escarpments and a number of valleys emanate from the plateau 15 86 On the western side of Quelccaya these valleys include from northwest of the ice cap southward the Qori Kalis valley Challpa Cocha valley 87 Huancane valley and South Fork e valley 87 The Huancane valley is 0 5 kilometres 0 31 mi wide and flat and has the South Fork valley as a tributary 38 The Huancane valley runs southwestwards away from Quelccaya and is occupied by the Huancane River 88 89 Moraines from glaciers lie in the valleys radiating from the ice cap and contain alluvial deposits and peat bogs ponds and wetlands within depressions 47 90 91 Clay and peat are also found incorporated in moraines they crop out where floods have eroded into moraines 50 92 Blocky boulders with sizes of up to 7 metres 23 ft dot the valley floors 38 In some places glaciers have likely quarried the underlying rocks 93 West of Quelccaya lies a high plain that is formed by glacial outwash and till 37 The terrain features landforms such as drift deposits lakes moraines and moraine dammed lakes outwash fans peat bogs 37 94 95 rocks bearing glacial striations streams and wetlands 70 95 96 A number of lakes occur in the region of Quelccaya and the Cordillera Vilcanota including Sibinacocha south of the Cordillera Vilcanota Among the lakes close to the Quelccaya ice cap area 97 Laguna Accocancha Aconcancha and Laguna Paco Cocha upvalley from Aconcancha both south of the Huancane valley 98 99 100 Challpacocha west southwest from Qori Kalis it is a tarn lake that receives meltwater from Quelccaya through several channels that flow through wetlands 91 95 Churuyo southwest from Quelccaya 98 Lado del Quelccaya Lado del Quelccaya 2 and Laguna 5 due west 97 North Lake Base Camp Lake and Boulder Lake west of Quelccaya These three lakes lie at 5 100 5 200 metres 16 700 17 100 ft elevation and formed within bedrock depressions when the glaciers retreated 1 Pegador Pond west northwest from the ice cap 97 Yanacocha in the South Fork valley west of Quelccaya 26 101 It also is a tarn lake 91 and developed in a formerly glaciated basin below an ignimbrite headwall It currently forms a separate watershed from Quelccaya as it does not receive meltwater 26 Geology Edit Quelccaya lies on a plateau formed by ignimbrites and welded tuffs 30 37 which are of rhyolitic composition although the occurrence of andesite has also been reported 38 102 The rocks were emplaced during the Miocene six million years ago and only little erosion has taken place since then 38 103 The volcanics may correlate with the Quenamari volcanics farther east 104 West of Quelccaya a Holocene normal fault runs in north south direction part of the Ocongate fault system 105 this fault system extends across the Cordillera Vilcanota and has offset moraines indicating it is active 106 107 Climate EditAnnually about 1 150 millimetres 45 in of snow water equivalent accumulate on Quelccaya 10 in the form of graupel about 2 3 metres 6 ft 7 in 9 ft 10 in snow f with rainfall sometimes occurring near its margins and also near its summit 109 110 111 This is much wetter than most of the tropical Andes a consequence of Quelccaya s proximity to the Amazon 38 This moisture originates from the Amazon and the Atlantic Ocean and is transported to Quelccaya by trade winds a temperature inversion and blocking effects of coastal topography prevent moisture from the Pacific Ocean from reaching the ice cap 1 112 Most precipitation falls in austral summer during the summer monsoon 113 when high insolation leads to intense convection and showers 111 The location of the ice cap also generated orographic precipitation 114 a type of precipitation forced by the ascent of air over mountains 115 Most snowfall occurs during the passage of cold fronts and cold air inclusions the net amount depends on the duration of the wet season 116 117 118 Most precipitation falls in the afternoon but a second phase occurs during the night 108 Unlike precipitation temperatures are relatively stable throughout the year with day night temperature differences exceeding seasonal ones 10 48 Temperatures at the top of Quelccaya are inferred to be between 4 8 C 23 4 F and 4 2 C 24 4 F For the margin of Quelccaya mean temperatures have been inferred under the assumption that the lapse rate g is constant Varying between 6 3 and 0 9 C 20 7 and 33 6 F the mean temperature at the margin is 3 3 C 26 1 F during the dry season During the wet season it varies between 3 1 and 2 9 C 26 4 and 37 2 F with a mean of 0 5 C 31 1 F 1 37 As a consequence of global warming temperatures on the summit of Quelccaya sometimes rise above freezing accelerating the shrinkage of the ice cap 36 120 Winds are strongest during the day and mostly blow from the west except during the rainy season when they also come from the east or north east 121 122 The ice cap itself generates its own downslope katabatic wind which blows over the ice and quickly peters out with distance from the ice margin 123 Climate variability Edit The climate is influenced by the El Nino Southern Oscillation and by the position of the Intertropical Convergence Zone 26 124 during El Nino years precipitation is much less as westerly winds suppress the transport of easterly moisture to Quelccaya 26 113 During the strong 2014 2016 El Nino event there was a net decrease in snow height on Quelccaya 125 Further during El Nino there is a front loading of precipitation with an earlier onset of the monsoon and decreased precipitation in its middle and late phase 126 Temperatures are also modulated by El Nino events during which an increase is observed although winter temperatures decrease 125 126 127 Ice cores show evidence of past climate variability such as increased precipitation in the years 1870 1984 1500 1720 760 1040 and with drought in the years 1720 1860 1250 1310 650 730 570 610 and 540 560 128 One of these wet periods has been correlated to the Medieval Climate Anomaly 1 000 700 years ago 129 while drought periods have been linked to cultural changes in the Peruvian Moche culture and the collapse of the pre Columbian Tiwanaku empire 130 131 Apart from precipitation climate at Quelccaya has been stable over the past 1500 years 132 During recent decades precipitation has not fluctuated significantly 13 but temperatures have been steadily increasing 127 Vegetation and animal life Edit nbsp The white winged diuca finch nests on Quelccaya nbsp The white fronted ground tyrant nests on Quelccaya The terrain west of Quelccaya is sparsely vegetated with high elevation tundra vegetation 26 133 The vegetation in the region is known as puna grassland 134 48 above 4 300 metres 14 100 ft elevation it is defined as super Puna and consists of herbs and shrubs such as Plantago and trees like Polylepis which grow to the ice cap and often have a krummholz appearance 135 The main human use of the area is livestock grazing but crop planting has also been reported 26 136 There are over fifty plant species in the terrain around the ice cap 136 Aquatic plants are found in lakes 91 The glacial runoff and precipitation guarantee an ample water supply leading to the development of wetlands known as bofedales and peat 38 The cushion plant Distichia muscoides is the dominant plant in the bofedales and these wetlands are hotspots of biodiversity 28 91 137 but tussock grasses have been expanding in the wetlands as ice retreats 137 Other plants include Festuca orthophylla a grass Jarava ichu Peruvian feathergrass and nettles 22 Twenty three lichen species have been identified growing on rocks at Quelccaya 133 136 Among animals are 60 species of birds 28 while mammals in the surrounding region include Andean foxes Andean mountain cats deer vicunas and vizcachas 22 138 and amphibians and water fleas occur in lakes 91 136 Two birds 139 the glacier finch and the white fronted ground tyrant are known to nest on the Quelccaya ice cap 139 140 mostly within cavities in the ice that are barely accessible to humans 139 The finch is known to nest on ice elsewhere in the tropical Andes 111 and other bird species might also nest on the Quelccaya ice 137 Other than these finches only emperor penguins are known to nest on ice ice is an ill suited environment for the raising of young birds and Quelccaya presents additional challenges linked to its high elevation 11 28 Other birds nest in protected locations in the general Quelccaya area and some species also roost on the ice 141 Scientific research and monitoring EditGlaciers in the region have been monitored since the 1970s Sediment cores in lakes and peat and cosmogenic isotope dating have been used to infer past states of the ice cap 49 and since 1976 Quelccaya is regularly reconnoitered 142 An automated weather station that records meteorological parameters was installed in 2003 and reinstalled in 2004 after vandalism 143 and snow is sampled annually although continuous precipitation records do not exist 13 113 The American paleoclimatologist Lonnie Thompson and the Ohio State University OSU have been monitoring Quelccaya since 1974 and the ice cap has been investigated for its glaciology and for both its past and present climate 144 145 Ice cores Edit The layered appearance of the Quelccaya ice cap at its margins suggested to scientists that the ice cap could be used to obtain ice cores with annual resolution 146 After a summer field program that lasted between 1976 and 1984 147 in 1983 Thompson and the OSU team obtained two ice cores that were 163 6 metres 537 ft and 154 8 metres 508 ft long h from the central area of the ice cap 29 43 149 The ice cores were drilled with the help of a solar powered ice drill specifically developed for Quelccaya because other power sources could not be brought onto the ice cap 43 150 These ice cores were investigated by the OSU Byrd Polar Research Center 151 They cover a timespan of 1 500 and 1 350 years with the longer ice core going back to 470 AD 43 148 152 Another shorter ice core measuring 15 metres 49 ft in length and spanning 8 years was obtained in 1976 others followed in 1979 1991 1995 and 2000 142 Dust layers deposited during the dry season allow the determination of yearly layers 43 153 which characteristically thin downward 81 Volcanic ash deposited by the 1600 Huaynaputina eruption has been used to date the ice cores 154 155 in turn the volume of the eruption was reconstructed from the ash thickness in the ice core 156 A number of research findings have been made with the Quelccaya ice cores The ice cores contain annually resolved oxygen isotope ratio variations During the past millennium the oxygen isotope ratios recorded at Quelccaya have resembled these found in other tropical South American and also Tibetan ice cores 72 157 While originally proposed to reflect temperature variations the oxygen isotope ratios have also been assumed to reflect atmospheric circulation and temperatures in the Pacific Ocean and tropical North Atlantic 120 158 Oxygen isotope ratio variations record the Little Ice Age 159 which clearly stands out in the Quelccaya ice core record 160 The Quelccaya record was used to infer that the Little Ice Age was a global event 161 and that temperature and precipitation variations took place during the Little Ice Age An early wet phase occurred between 1500 and 1720 and a late dry phase between 1720 and 1880 159 162 At the ice cap the Little Ice Age ended relatively suddenly around 1880 163 The oxygen isotope ratios also vary during El Nino years and the ice cores have been employed to make a record of ENSO events 75 126 The 1976 and the 1982 1983 El Nino events have been identified in the ice cores 164 A correlation between precipitation on the ice cap with water levels in Lake Titicaca and traces of the severe drought between 1933 and 1945 have been found in the ice core record of Quelccaya 165 166 Other climate events recorded at Quelccaya are the 1815 eruption of Indonesia s Mount Tambora and the 536 climate downturn 167 168 Additional findings in the ice cores are dust clouds generated by earthquakes in the dry Atacama and Pacific coast of Peru 169 dust correlated to droughts traces of the Suess cycle which is a solar cycle 170 171 evidence of Inka and Spanish industrial activity in South America and finally of agriculture around Lake Titicaca 165 172 The Quelccaya ice cores are widely used to reconstruct past climate states 173 Quelccaya was the first ice cap outside of the polar regions from which old ice cores were obtained 34 174 and is the site of the first annually resolved ice core record from the tropical Andes it demonstrated the usefulness of tropical ice for ice core studies 120 175 and the taking of these cores has been called a major step in the sampling of high elevation ice in the world 176 Quelccaya was selected as a site for extra polar ice core research as it is located in the sparsely investigated tropics and lies at a higher elevation than Puncak Jaya in Indonesia or the Rwenzori Mountains in Africa thus the ice is less disturbed by percolating meltwater 44 Because of the lack of seasonal temperature variations and of synoptic weather patterns tropical glaciers may primarily record secular climate change 10 The dome like shape and the low elevation range of the Quelccaya Ice Cap result in large responses of ice extent to relatively small changes in the equilibrium line altitude i 178 Natural history EditMoraines deposited by older glaciers indicate that during the Pleistocene and Holocene glaciers extended over larger surfaces 49 covering the area with sandy drift derived from ignimbrites 89 The ice extended over the outwash and till covered plain west of Quelccaya and connected with the Cordillera Vilcanota ice cap 179 180 During the maximum extent the ice reached down to elevations of 4 500 metres 14 800 ft as the equilibrium line altitude decreased by 360 metres 1 180 ft 181 this change in the equilibrium line altitude is considerably less than the decrease found elsewhere in the Peruvian Andes and may reflect topographical controls on glacier expansion 182 183 The connection with the Vilcanota ice cap may have occurred during the last glacial maximum 35 No direct evidence of glacier expansions in times preceding marine isotope stage 4 remain although an early glaciation of Quelccaya had ice advance to twice the distance it assumed during the Wisconsin glaciation 14 184 Maximum extent occurred either about 20 000 years ago or between 28 000 and 14 000 years ago j The maximum extent occurred during the Weichselian Wisconsin glaciation and within marine isotope stage 2 182 183 185 186 By 13 600 12 800 years ago Quelccaya had retreated concomitant with global glacier shrinkage at the end of the last glacial maximum A readvance occurred 12 500 years ago linked to a colder and wetter climate during the Younger Dryas Retreat recommenced 12 400 years ago and by 11 800 11 600 years ago the ice cap had reached an extent like during the Little Ice Age and modern times 187 188 Another proposed chronology indicates a glacier expansion beginning 13 300 years ago and ending by 12 900 years ago with Quelccaya reaching a size not much larger than during the Holocene by 12 800 years ago 189 A final scenario envisages an advance between 12 700 and 11 000 years ago 190 There might have been two readvances one in the early Younger Dryas and the other around 12 600 years ago 191 A halt in retreat or an actual advance of Quelccaya may or may not have occurred at the same time as the former Lake Tauca existed on the Altiplano k and it is possible that the retreat occurred during the middle Younger Dryas 191 193 Holocene Edit During the Holocene Quelccaya did not expand farther than 1 kilometre 0 62 mi from its present position and early Holocene moraines have not been found 194 195 It is possible that during the mid Holocene Quelccaya was ice free altogether 196 peat deposits and ice cores indicate that it was reduced or even absent then 197 Until either 7 000 years ago or between at least 7 000 years ago and about 5 000 years ago plants grew at its margins 178 198 199 including cushion mire vegetation judging by exposed remains This shrinkage may relate to a warmer and drier climate at that time 199 200 The ice cap began to grow again at a time of global climate change 5 000 years ago which included the drying of the Sahara at the end of the African humid period and wetter and colder conditions in the extratropics 201 202 This re expansion was part of the global neoglacial glacier expansion 203 this pattern of a larger ice cap during the late Holocene than the early is similar to that of Northern Hemisphere glaciers and may reflect Northern Hemisphere insolation 70 A similar history of early Holocene shrinkage followed by late Holocene expansion has been noted at the Rwenzori Mountains in Africa The ice cap reached its Holocene maximum extent during the Little Ice Age 204 205 About 4 000 years ago a new retreat occurred under the influence of warmer and drier climates 206 and another shrinkage also occurred between 3 000 and 1 500 years ago 207 Alternatively 3 400 and 1 500 years before present the ice cap may have extended 1 kilometre 0 62 mi past its current limit and about 0 8 kilometres 0 50 mi past its limit 1 600 years ago 208 Chronology at Huancane and Qori Kalis Edit Multiple moraines have been dated in the Huancane valley 37 Three separate glacial stages have been identified here H1 the shortest H2 and H3 the longest 99 They have left moraines 8 kilometres 5 0 mi 4 kilometres 2 5 mi and 1 kilometre 0 62 mi from the 2002 ice margin and are also known as Huancane I Huancane II and Huancane III names which are sometimes applied to the glacial advances themselves 100 209 The moraines in the valley are terminal moraines and consist of sets of ridges up to 1 kilometre 0 62 mi wide 35 210 Boulders found on the Huancane III moraines have fresher appearances than these on the other moraines 89 Huancane III has also been subdivided into Huancane IIIa IIIb and IIIc and Huancane II into Huancane IIa IIb and IIc 38 94 These are all regressional moraines as by the time of the emplacement of Huancane moraines Quelccaya was shrinking and was already disconnected from the ice on the Cordillera Vilcanota 211 212 Finally there is a set of moraines farther down the Huancane valley that appears to be the oldest 213 Equivalents of the Huancane moraines have been identified outside of the Huancane valley 36 Huancane III appear to be a last glacial maximum stand or a stand just after the last glacial maximum such as Heinrich event 1 although its age is not well known 38 214 215 Huancane II appear to have formed during a post last glacial maximum advance 215 One view sees Huancane II as preceding the Younger Dryas and perhaps connected to the Antarctic Cold Reversal 188 216 217 another one assumes that Quelccaya was smaller during the Antarctic Cold Reversal and that Huancane II formed during the Younger Dryas 38 187 and a final one that Huancane II was a localized glacier advance 218 Huancane I moraines are less than 1 000 years old and reflect the Little Ice Age extent of the Quelccaya ice cap which at Quelccaya occurred between about 1490 and 1880 86 219 220 They also record expansions that occurred 1 000 600 400 and 200 years ago 92 Huancane I moraines are found all around Quelccaya and noticeable Little Ice Age moraines are also found in front of the outlet glaciers on the southeastern side of Quelccaya 197 221 About 16 late Holocene moraines are also found downstream of Qori Kalis glacier 34 with the largest advance occurring before 520 60 years ago followed by a progressive retreat and a readvance about 350 300 years ago Similar glacier advance and retreat patterns have been observed in the Cordillera Blanca and Cordillera Vilcabamba in Peru the Bolivian Andes and also in Patagonia and New Zealand and appear to reflect cold climate oscillations 222 Implications Edit Estimating the ages of moraines is difficult A retreating glacier will deposit successive moraines but an advancing one can destroy older moraines less extensive than the glacier advance Dates obtained from organic material behind a moraine may be considerably younger than the moraine as its development occurs with a lag from deglaciation while organic matter in or underneath a moraine may be considerably older 223 Changes in sediment fluxes to lakes west of Quelccaya appear to reflect advances and retreats of glaciers with meltwater formed during retreats increasing sediment fluxes 224 The extent of the Quelccaya ice cap does not appear to correlate with the amount of precipitation occurring on the ice cap except in particular cases 222 temperature effects appear to dominate and warmer and wetter climates have been associated with retreat 220 225 This dominance of temperature over precipitation in determining ice cap size and glacier length has been replicated by modelling 226 Interannual climate variability does not have substantial effects on the extent of the ice cap 227 Present retreat Edit nbsp A proglacial lake at QuelccayaThe glaciers are melting at increasing rates with rapid deglaciation underway during the late 20th century at a rate that is comparable to or exceeds that of postglacial retreat rates 228 Between 1980 and 2010 the ice cap shrank at a rate of 0 57 0 1 square kilometres per year 0 220 0 039 sq mi a with a loss of 30 of its area between 1979 and 2014 229 230 231 Between 1990 and 2009 a southeastern branch of the ice cap disappeared altogether 232 At the northwestern and southeastern ends of the ice cap the retreat has reached the plateau that Quelccaya sits on 71 Additionally parts of the northwestern ice cap have separated from the main ice body and by 2011 the retreat had reduced Quelccaya to a size smaller than at any other time in the past 6 000 years 233 234 There is some variation between retreat rates measured by different researchers as the Quelccaya ice cap is differently defined and due to differences between extents measured in seasons with and without snow cover 235 True fluctuations also occur such as an advance of part of Quelccaya s southern margin reported in 1977 which bulldozed peat deposits 17 236 a pause of the Qori Kalis glacier between 1991 and 1993 probably linked with the global cooling caused by the Philippine Pinatubo eruption in 1991 237 a slow down in the mid 2000s and an overall higher rate of retreat since 2000 238 The Qori Kalis outlet glacier has been observed since 1963 and between 1963 and 1978 retreated by about 6 metres per year 20 ft a and between 1991 and 2005 by about 60 metres per year 200 ft a 1 34 The retreat has been accompanied by a volume loss of the ice cap increasing from 290 000 cubic metres per year 10 000 000 cu ft a between 1963 and 1978 over 1 310 000 cubic metres per year 46 000 000 cu ft a between 1978 and 1983 to 2 200 000 cubic metres per year 78 000 000 cu ft a between 1983 and 1991 49 The rate of retreat is higher than at the end of the last ice age and the glacier responds quickly to climate alterations 9 Similar retreats have been observed at other tropical glaciers and are linked to the increase in global temperatures caused by industrial greenhouse gas emissions 2 4 This warming is unprecedented by the standards of the late Holocene 239 Consequences Edit Meltwater lakes 233 and proglacial lakes have formed in front of Qori Kalis glacier and other Quelccaya glaciers and expanded in size 71 235 240 241 These lakes could be sources of future glacial lake outburst floods although the sparse population of the area means that potential damages caused by these floods would be lessened 242 Two such floods occurred in March 2006 and December 2007 caused property damage and killed livestock 241 In addition some lakes have drained and the course of streams has changed as the glaciers have retreated 243 The freezing level regularly rises above the summit of Quelccaya and in recent ice cores meltwater infiltration has become apparent 52 244 Consequently oxygen isotope ratios are no longer preserved in the ice while this infiltration has smoothened the record only to a certain depth 245 246 247 it illustrates the threat that climate change is creating for the existence of climate archives in ice cores 248 Alpine life is quickly advancing into the terrain left by ice 136 and the retreat has exposed plant remains that had been overrun during a glacier expansion that occurred 5 000 years ago 202 Projections Edit Projected climate change is expected to involve a further 3 5 C 5 4 9 0 F warming in the central Andes with higher warming occurring at higher elevations 229 In the RCP8 5 climate change scenario l during the 21st century the equilibrium line altitude will rise above the top of the ice cap and thus the entire cap will become a zone of net ice loss and Quelccaya will disappear In scenarios that include aggressive mitigation measures the ice cap may persist while intermediate scenarios predict a loss of the ice cap in the 22nd century 250 251 There is some uncertainty owing to for example changes in precipitation including any potential future decrease 252 253 Hydrology and significance EditGlacial meltwater is an important source of water especially in dry years and during the dry season 4 including in the Altiplano and in the hyperarid coasts of Peru 239 For example about 80 of Peru s hydropower sources are buffered by glacial meltwater 254 Avalanches and floods from glaciers have killed over 35 000 people and glacial retreat will likely increase their incidence 145 239 Enhanced melting may be contributing to streamflow and past meltwater flows might have contributed to the formation of large lakes in the Altiplano 4 Most of Quelccaya borders on the Inambari River watershed especially on the east and south the western parts of the ice cap border on the Vilcanota River Urubamba River catchment m of which it is an important part 256 257 Clockwise from the northwest the Rio Chimboya the Quebrada Jetun Cucho the Quebrada Queonani the Rio Quelcaya Mayu an unnamed river the Rio Huancane the Rio Ritiananta and the Quebrada Accoaysana Pampa emanate from the ice cap The first four rivers eventually converge into the westward flowing Rio Corani a tributary of the northward flowing Rio Ollachea Rio Sangaban which eventually ends into the Inambari River 258 259 the last four rivers eventually converge into the southwards flowing Rio Salcca which then turns west and ends into the Vilcanota River 258 260 Some of the valleys that drain southeastward northeastward and west northwestward from Quelccaya can be affected by glacier related floods 261 Quelccaya is the largest glacierized area in the watershed of the San Gaban hydropower plant and also of the catchment Rio Vilcanota watershed 257 262 its water is used by the Cusco Region 145 The water is used for both irrigation and hydropower production The population in the region is for the most part rural with low socioeconomic status and as such is highly vulnerable to the effects of climate change Additionally glaciers have important religious and social value for the local communities 253 Notes Edit It has also been compared to a plateau glacier 32 Dome shaped parts of the ice cap 36 Inclined boards or sheets of snow 56 Meaning that ice temperatures below 10 metres 33 ft depth reach 0 C 32 F 63 Informal name 38 Huancane is sometimes called North Fork Huancane 87 Graupel snow crystals with much rime is common 108 The rate at which temperature declines with elevation 119 Reaching the bedrock 148 The equilibrium line altitude is the elevation on an ice body where the annual ice accumulation and ice loss balance each other 177 Different sources give different ages 183 185 Approximately 17 500 15 000 years ago 192 RCP8 5 is an extreme greenhouse gas emissions scenario with unmitigated increases in greenhouse gas emissions It is not the most likely scenario given the decrease in some high greenhouse gas emission energy sources such as coal 249 Sometimes it is also stated that Lake Titicaca receives water from Quelccaya 255 but watershed maps show Quelccaya bordering on the Inambari River and Vilcanota River watershed both of which drain to the Atlantic Ocean 256 See also Edit nbsp Mountains portal nbsp Environment portal nbsp Peru portalList of glaciers Water supply and sanitation in PeruReferences Edit a b c d e f g Buffen et al 2009 p 158 a b Buffen et al 2009 p 157 Mark et al 2002 pp 287 288 a b c d Mark et al 2002 p 288 a b Smith et al 2005 p 159 Gade Daniel W 2016 Spell of the Urubamba Springer International Publishing p 8 doi 10 1007 978 3 319 20849 7 ISBN 9783319208480 S2CID 132567736 Jorgensen Peter M Cano Asuncion Leon Blanca Gonzales Paul 2018 Flora vascular y conexiones fitogeograficas de las montanas Carabaya Peru Revista Peruana de Biologia 25 3 191 210 doi 10 15381 rpb v25i3 15228 ISSN 1727 9933 Hastenrath 1978 p 86 a b Kargel et 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of Geophysical Research 89 D3 4638 Bibcode 1984JGR 89 4638T doi 10 1029 JD089iD03p04638 Thompson Lonnie G Mosley Thompson Ellen 1987 Berger W H Labeyrie L D eds Evidence of Abrupt Climatic Change During the Last 1 500 Years Recorded in Ice Cores from the Tropical Quelccaya Ice Cap Peru pp 99 110 doi 10 1007 978 94 009 3993 6 9 ISBN 9789401082723 a href Template Cite book html title Template Cite book cite book a work ignored help Thompson Lonnie G 1 January 2000 Ice core evidence for climate change in the Tropics implications for our future Quaternary Science Reviews 19 1 19 35 Bibcode 2000QSRv 19 19T doi 10 1016 S0277 3791 99 00052 9 ISSN 0277 3791 Thompson Lonnie G Mosley Thompson Ellen Henderson Keith A May 2000 Ice core palaeoclimate records in tropical South America since the Last Glacial Maximum Journal of Quaternary Science 15 4 377 394 Bibcode 2000JQS 15 377T doi 10 1002 1099 1417 200005 15 4 lt 377 AID JQS542 gt 3 0 CO 2 L Thompson L G Mosley Thompson E 2013 One Half Millennia of Tropical Climate Variability as Recorded in the Stratigraphy of the Quelccaya Ice Cap Peru Aspects of Climate Variability in the Pacific and the Western Americas Geophysical Monograph Series American Geophysical Union AGU 15 31 doi 10 1029 gm055p0015 ISBN 9781118664285 Thompson Lonnie G Davis Mary E Mosley Thompson Ellen Porter Stacy E Corrales Gustavo Valdivia Shuman Christopher A Tucker Compton J 1 August 2021 The impacts of warming on rapidly retreating high altitude low latitude glaciers and ice core derived climate records Global and Planetary Change 203 103538 Bibcode 2021GPC 20303538T doi 10 1016 j gloplacha 2021 103538 ISSN 0921 8181 S2CID 236274780 Vickers Anthony C Shakun Jeremy D Goehring Brent M Kelly Meredith A Jackson Margaret S Doughty Alice Russell James 2020 Similar Holocene glaciation histories in tropical South America and Africa Geology 49 2 140 144 doi 10 1130 G48059 1 S2CID 234041160 External links EditQuelccaya Climate Scaling Quelccaya Using 3 D Animation and Satellite Data To Visualize Climate Change Retrieved from https en wikipedia org w index php title Quelccaya Ice Cap amp oldid 1172181401, wikipedia, wiki, book, books, library,

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