Western Patagonia: A Key Area for Understanding Quaternary Paleoclimate at Southern Mid-Latitudes

Moreno, P. I.

doi:10.1007/978-1-4615-0645-4_5

Cited by 5 publications

(5 citation statements)

References 78 publications

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“…The deglaciation in Patagonia had several retreats and advances (Mercer, 1968(Mercer, , 1970Strelin and Malagnino, 2000;Wezens, 2002). However, glacial evolution is complicated, especially between northern and southern Patagonia (Moreno, 2002). The humidity supply for a glacier budget is linked to the latitudinal location of the Westerlies winds.…”

Section: Regional Settingmentioning

confidence: 99%

Early formation of gnammas (weathering pits) in a recently glaciated area of Torres del Paine, southern Patagonia (Chile)

Domínguez‐Villar

2006

Geomorphology

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Section: Regional Settingmentioning

confidence: 99%

Early formation of gnammas (weathering pits) in a recently glaciated area of Torres del Paine, southern Patagonia (Chile)

Domínguez‐Villar

2006

Geomorphology

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“…In the latter study, it was found that at the maximum extent, roughly to the limits shown by moraines, an ELA depression of $900 m reached the 'best fit' in terms of the geological record. Hubbard et al (2005) then scaled the former ELA record to the Vostok palaeotemperature record (Vimieux et al, 2002), for the period 23-17 ka; a modelled ELA depression fluctuated between $950 (Singer et al, 2000), glacial advances and cool periods in the Chilean Lake District (CLD) Moreno et al, 1999;Moreno, 2002; calendar ages based on Calib 5.02 (Reimer et al, 2004) and Fairbanks et al, 2005), moraine ages at LBA Kaplan et al, 2004), and chronology of moraines and deglaciation in the Strait of Magellan and Bahía Inú til Kaplan et al, 2008). In the northern and southern parts of the CLD/IGC region, the maximum ice extent was during the first and last advances, respectively.…”

Section: Modelling Of Local Lgm Ice and Climatementioning

confidence: 99%

“…Towards southern Patagonia and Tierra del Fuego, inferred glacial reconstructions are generally more extensive relative to current ice limits. This is likely due to the more southerly latitude and polewardshift in the westerlies (relative to the LGM condition), which by then were closer to their interglacial position McCulloch et al, 2000;Moreno, 2002;Sugden, 2005). East of the CLD/IGC the glacial limits are not known precisely, but they appear to be in the mountains (e.g.…”

Section: Lateglacial ($17-10 Ka)mentioning

confidence: 99%

“…ka BP (Porter et al 1992;, Kaplan et al, 2008, despite its southerly position on the continent. One possibility is that the initial deglaciation at LBA, after Fenix I, corresponds to the second step of warming in the CLD Moreno et al, 1999;McCulloch et al, 2000;Moreno, 2002). The above hypotheses can be tested with future studies, both field and modelling-based.…”

Section: Uncertainties and Outstanding Problemsmentioning

confidence: 99%

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Glacial dynamics in southernmost South America during Marine Isotope Stage 5e to the Younger Dryas chron: a brief review with a focus on cosmogenic nuclide measurements

Kaplan

Moreno

Rojas

2008

J Quaternary Science

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The timing of major glacial changes between Marine Isotope Stage (MIS) 5e and the Younger Dryas chron (YD) in southern South America is reviewed. Focus is placed on studies that use cosmogenic nuclide measurements. However, other dated records and modelling results are also discussed to provide the broader glacial geological context. Limits on the state of glacial geologic knowledge are examined and suggestions are made as to how some of these can be addressed in future studies. Studies show that on the east side of the Andes at Lago Buenos Aires (45 degrees S) there is evidence indicating that following a MIS 6 glaciation ice was less extensive during MIS 4 than MIS 2. In contrast, on the west side of the Andes in the Chilean Lake District area, MIS 4 ice may have been more extensive than during MIS 2. Although Patagonia experienced an MIS 2 glaciation broadly in phase with that in other areas around the globe, there are differences in glacial histories between areas on millennial timescales. Climate reversals are evident in many records between ca. 17 and 10 ka. The timing of such Lateglacial activity, which included less extensive advances than during the local Last Glacial Maximum (LGM), varies somewhat between areas. This could be due to the relative influence of middle- to high-latitude climatic regimes. At present, chronological uncertainties prevent confident assignment of cosmogenic ages for glacial events at the millennial timescale and defining associated climate variability between different study areas.NSF ATM-0212450 Royal Society of London NERC Comer Science and Educational Fellowship Fondecyt 1070991 1050416 CEQUA Institute of Ecology and Biodiversity P02-051 PFB-23 L-DEO 7158 Weeks Postdoctoral Fellowshi

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“…Furthermore, the extent to which teleconnections exist between the timing and nature of environmental changes in southern South America and those in the Northern Hemisphere remains contentious (Bennett et al, 2000;Luckman and Villalba 2001;Glasser et al 2006). Western Patagonia is a key area for testing hypotheses of global climate change (Moreno, 2002;Glasser et al, 2004), but a much fuller picture of the Patagonian glacial chronology is required if these regional, interhemispheric and global questions are to be resolved and this paper contributes to this debate. However, there remain uncertainties in the development of Holocene glacier chronologies in Patagonia.…”

Section: Introductionmentioning

confidence: 95%

Glaciar León, Chilean Patagonia: late-Holocene chronology and geomorphology

et al. 2008

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Glaciar León is a temperate, grounded outlet of the eastern North Patagonian Icefield (NPI). It terminates at an active calving margin in Lago Leones, a 10 km long proglacial lake. We take a multidisciplinary approach to its description and use ASTER imagery and clast sedimentology to describe the geomorphology of the glacier and its associated moraines. We date periods of glacier retreat over the last 2500 years using a combination of lichenometric, dendrochronological, cosmogenic and optically stimulated luminescence techniques and show that the glacier receded from a large terminal moraine complex some 2500 years ago and underwent further significant recession from nineteenth-century moraine limits. The moraine dates indicate varying retreat rates, in conjunction with significant downwasting. The bathymetry of Lago Leones is characterized by distinct ridges interpreted as moraine ridges that dissect the lake into several basins, with water depths reaching 360 m. The fluctuations of Glaciar León appear to have been controlled by the interplay between climatic forcing and calving dynamics.

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Western Patagonia: A Key Area for Understanding Quaternary Paleoclimate at Southern Mid-Latitudes

Cited by 5 publications

References 78 publications

Early formation of gnammas (weathering pits) in a recently glaciated area of Torres del Paine, southern Patagonia (Chile)

Early formation of gnammas (weathering pits) in a recently glaciated area of Torres del Paine, southern Patagonia (Chile)

Glacial dynamics in southernmost South America during Marine Isotope Stage 5e to the Younger Dryas chron: a brief review with a focus on cosmogenic nuclide measurements

Glaciar León, Chilean Patagonia: late-Holocene chronology and geomorphology

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