Present-day South American climate

Garreaud, René D.; Vuille, Mathias; Compagnucci, Rosa Hilda; Marengo, José A.

doi:10.1016/j.palaeo.2007.10.032

Cited by 1,345 publications

(1,415 citation statements)

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“…Another explanation may be a difference between regions more directly affected by the ITCZ (e.g. north east Brazil) and areas where convection (more monsoon-type) dominates (Garreaud et al, 2009). Such an explanation might also explain the contrast in full glacial conditions between Laguna la Gaiba and NE and SE Brazil noted by Whitney et al (2011).…”

Section: Discussionmentioning

confidence: 99%

“…Moisture is also brought into the Pantanal from the Amazon basin by the South American Low level jet ( Fig. 1) which forms in response to development of the Chaco low (Garreaud et al, 2009). Precipitation varies from about 1700 mm per year in the north of the Pantanal to 1000 mm in the south, 70% of this falls in the summer (November to March).…”

Section: Study Sitementioning

confidence: 99%

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Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25 000 years

Metcalfe

Whitney

Fitzpatrick

et al. 2014

J Quaternary Science

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Diatom, geochemical and isotopic data provide a record of environmental change in Laguna La Gaiba, lowland Bolivia, over the last ca. 25,000 years. High-resolution diatom analysis around the last glacial -interglacial transition provides new insights into this period of change. The full and late glacial lake was generally quite shallow, but with evidence of periodic flooding. At about 13,100 cal a BP, just prior to the start of the Younger Dryas chronozone, the diatoms indicate shallower water conditions, but there is a marked change at about 12,200 cal a BP indicating the onset of a period of high variability, with rising water levels punctuated by periodic drying. From ca. 11,800 to 10,000 cal a BP stable, deeper water conditions persisted. There is clear evidence for drying in the early to mid Holocene, but not as pronounced as that reported from elsewhere in the southern hemisphere tropics of South America. This was followed by the onset of wetter conditions in the late Holocene consistent with insolation forcing. Conditions very similar to present were 2 established about 2,100 cal a BP. A complex response to both insolation forcing and millennial scale events originating in the North Atlantic is noted.

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Section: Discussionmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25 000 years

Metcalfe

Whitney

Fitzpatrick

et al. 2014

J Quaternary Science

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“…The coast of southern Peru and northern Chile is the most arid region on Earth (annual precipitation <20 mm) as a result of three main causes [52][53][54]: (1) The Andes represent a major topographic barrier to atmospheric circulation in South America; (2) A temperature inversion layer over the Pacific Ocean (700-1000 m) due to the Humboldt cold-water current and (3) Large-scale tropospheric subsidence.…”

Section: Climatic Settingsmentioning

confidence: 99%

Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes

et al. 2018

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This work investigates the timing, paleoclimatic framework and inter-hemispheric teleconnections inferred from the glaciers last maximum extension and the deglaciation onset in the Arid Tropical Andes. A study area was selected to the northeastward of the Nevado Coropuna, the volcano currently covered by the largest tropical glacier on Earth. The current glacier extent, the moraines deposited in the past and paleoglaciers at their maximum extension have been mapped. The present and past Equilibrium Line Altitudes (ELA and paleoELA) have been reconstructed and the chlorine-36 ages have been calculated, for preliminary absolute dating of glacial and volcanic processes. The paleoELA depression, the thermometers installed in the study area and the accumulation data previously published allowed development of paleotemperature and paleoprecipitation models. The Coropuna glaciers were in maximum extension (or glacial standstill) 20-12 ka ago (and maybe earlier). This last maximum extension was contemporary to the Heinrich 2-1 and Younger Dryas events and the Tauca and Coipasa paleolake transgressions on Bolivian Altiplano. The maximum paleoELA depression (991 m) shows a colder (−6.4 • C) and moister climate with precipitation ×1.2-×2.8 higher than the present. The deglaciation onset in the Arid Tropical Andes was 15-11 ka ago, earlier in the most southern, arid, and low mountains and later in the northernmost, less arid, and higher mountains.

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“…Precipitation is derived mostly from Atlantic Ocean moisture that is transported to the Andes via the easterlies (Garreaud et al, 2009). Seasonal rainfall variability in the tropical Andes is linked to the position of the Intertropical Convergence Zone (ITCZ) over the Pacific and Atlantic Oceans, and by the strength of the South American Summer Monsoon (SASM) over the Amazon Basin (Zhou and Lau, 1998;Maslin and Burns, 2000;Maslin et al, 2011;Vuille et al, 2012).…”

Section: Settingmentioning

confidence: 99%

The last deglaciation of Peru and Bolivia

Mark

Stansell

Zeballos

2017

CIG

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ABSTRACT. The tropical Andes of Peru and Bolivia are important for preserving geomorphic evidence of multiple glaciations, allowing for refinements of chronology to aid in understanding climate dynamics at a key location between hemispheres. This review focuses on the deglaciation from Late-Pleistocene maximum positions near the global Last Glacial Maximum (LGM). We synthesize the results of the most recent published glacial geologic studies from 12 mountain ranges or regions within

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Present-day South American climate

Cited by 1,345 publications

References 98 publications

Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25 000 years

Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25 000 years

Prospecting Glacial Ages and Paleoclimatic Reconstructions Northeastward of Nevado Coropuna (16° S, 73° W, 6377 m), Arid Tropical Andes

The last deglaciation of Peru and Bolivia

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