Fluctuations of the Última Esperanza ice lobe (52°S), Chilean Patagonia, during the last glacial maximum and termination 1

Sagredo, Esteban A.; Moreno, Patricio I.; Villa-Martínez, Rodrigo; Kaplan, Michael R.; Kubik, Peter W.; Stern, Charles R.

doi:10.1016/j.geomorph.2010.09.007

Cited by 89 publications

(151 citation statements)

References 71 publications

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“…Though roads or moraine ridges may be misidentified as shorelines from remote imagery, particularly where resolution is poor, they are generally clear in the field. In addition to shorelines within the Skyring lobe (Lovell et al, 2011), further examples of this feature have been mapped within the Río Gallegos lobe and around the coast of Bahía Inútil, supporting previous mapping Sagredo et al, 2011).…”

Section: Former Shorelinessupporting

confidence: 80%

“…In contrast to map, small regions of the hypothesised LGM geomorphology in the study area have been mapped in detail by Clapperton, Sugden, Kaufman, and McCulloch (1995), McCulloch and Bentley (1998), Benn and Clapperton (2000), Bentley, Sugden, Hulton, and McCulloch (2005) and Sagredo et al (2011). Bujalesky, Coronato, and Isla (2001) also mapped an area of older glaciofluvial fans to the south of Bahía San Sebastián and Coronato, Ercolano, Corbella, and Tiberi (2013) described the geomorphology surrounding the Aike maar, east of the Río Gallegos lobe.…”

Section: Introductionmentioning

confidence: 93%

“…; Rutter et al, 1989;Sagredo et al, 2011). However, studies focussing on the intervening glaciations have proven problematic (Evenson et al, 2009;Kaplan et al, 2007), likely due to the exhumation and erosion of erratic boulders used for cosmogenic dating.…”

mentioning

confidence: 99%

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A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

et al. 2014

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This paper presents a glacial geomorphological map of the landforms created by five large ice lobes that extended eastwards from the southernmost reaches of the Patagonian Ice Sheet during the Quaternary period. The study is focussed on Tierra del Fuego, but also updates previous mapping of the Skyring and Otway lobes, and the resulting level of detail and extent is a significant advance on previous work in the region. The map has been created as the necessary precursor for an improved understanding of the glacial history of the region, and to underpin a programme of dating glacial limits in the region. It was produced using Landsat ETM+ and ASTER satellite imagery and vertical aerial photography, supplemented by Google Earth TM imagery and field-checking. Eleven landform types were mapped: moraine ridges, subdued moraine topography, kettle-kame topography, glacial lineations, irregular and regular hummocky terrain, irregular dissected ridges, eskers, meltwater channels, former shorelines and outwash plains. The map reveals three important characteristics of the glacial geomorphology. First, the geomorphic systems are largely dominated by landforms associated with meltwater (channels, outwash plains and kettle-kame topography). Second, there is a difference in the nature of landforms associated with the northern three ice lobes, where limits are generally marked by numerous clear moraine ridges, compared to those to the south, where hummocky terrain and drift limits prevail. Finally, cross-cutting landforms offer evidence of multiple advances, in places, which has implications for the timing of limit deposition, and thus for the design and interpretation of a dating programme.

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Section: Former Shorelinessupporting

confidence: 80%

Section: Introductionmentioning

confidence: 93%

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A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

et al. 2014

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“…(Kaplan et al, 2004Douglass et al, 2005Douglass et al, , 2006Glasser et al, 2012) Río Bayo valley -47 -73 3 (3) (Glasser et al, 2006) Nef valley -47 -73 6 (5) (Glasser et al, 2012) Pueyrredón -47/-48 -71/-73 19 (16) (Hein et al, , 2010(Hein et al, , 2011Glasser et al, 2012) San Martín valley -49 -72/-73 10 (10) (Glasser et al, 2011) Río Guanaco -50 -73 21 (21) (Murray et al, 2012) Lago Argentino -50 -73 30 (27) (Ackert et al, 2008;Kaplan et al, 2011) Torres del Paine -51 -73/-74 54 (45) (Fogwill, 2003;Moreno et al, 2009;García et al, 2012) Río Gallegos -51/-52 -71/-72 7 (6) (Kaplan et al, 2007;Evenson et al, 2009;Sagredo et al, 2011) Magellan -52/-53 -69/-71 17 (10) Kaplan et al, 2008Kaplan et al, , 2007 BI-SSb -53/-54 -68/-70 46 (34) Kaplan et al, 2007Kaplan et al, , 2008Evenson et al, 2009;Darvill et al, 2015) Total within Last Glacial Cycle 289 (241)…”

Section: Supplementary Datamentioning

confidence: 99%

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Darvill

Bentley

Stokes

et al. 2016

Quaternary Science Reviews

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“…3). Stern (2008) and Sagredo et al (2011) reported nearly the same ages. According to the new age-depth model, the depth of 14.7 m (cd-ec) has an age of 15 102 cal BP well within the reported age range of the Reclús R 1 tephra, whereas the previous model gives a considerably older age of 16 034 cal BP (Kliem et al, 2013b).…”

Section: Age-depth Modelmentioning

confidence: 74%

Climate history of the Southern Hemisphere Westerlies belt during the last glacial–interglacial transition revealed from lake water oxygen isotope reconstruction of Laguna Potrok Aike (52° S, Argentina)

Zhu¹,

Lücke²,

Wissel³

et al. 2014

Clim. Past

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Abstract. The Southern Hemisphere Westerlies (SHW) play a crucial role in large-scale ocean circulation and global carbon cycling. Accordingly, the reconstruction of how the latitudinal position and intensity of the SHW belt changed during the last glacial termination is essential for understanding global climatic fluctuations. The southernmost part of the South American continent is the only continental mass intersecting a large part of the SHW belt. However, due to the scarcity of suitable palaeoclimate archives continuous proxy records back to the last glacial are rare in southern Patagonia. Here, we show an oxygen isotope record from cellulose and purified bulk organic matter of submerged aquatic moss shoots from Laguna Potrok Aike (52 • S, 70 • W), a deep maar lake located in semi-arid, extra-Andean Patagonia, covering the last glacial-interglacial transition (26 000 to 8500 cal BP). Based on the highly significant correlation between oxygen isotope values of modern aquatic mosses and their host waters and abundant well-preserved moss remains in the sediment record a high-resolution reconstruction of the lake water oxygen isotope (δ 18 O lw−corr ) composition is presented. The reconstructed δ 18 O lw−corr values for the last glacial are ca. 3 ‰ lower than modern values, which can best be explained by generally cooler air temperatures and changes in the moisture source area, together with the occurrence of permafrost leading to a prolonged lake water residence time. Thus, the overall glacial δ 18 O lw−corr level until 21 000 cal BP is consistent with a scenario of weakened or absent SHW at 52 • S compared to the present. During the last deglaciation, reconstructed δ 18 O lw−corr values reveal a significant two-step rise describing the detailed response of the lake's hydrological balance to this fundamental climatic shift. Rapid warming is seen as the cause of the first rise of ca. 2 ‰ in δ 18 O lw−corr during the first two millennia of deglaciation (17 600 to 15 600 cal BP) owing to more 18 O enriched precipitation and increasing temperature-induced evaporation. Following this interpretation, an early strengthening of the SHW would not be necessary. The subsequent decrease in δ 18 O lw−corr by up to 0.7 ‰ marks a millennial-scale transition period between 15 600 and 14 600 cal BP interpreted as the transition from a system driven by temperature-induced evaporation to a system more dominated by wind-induced evaporation. The δ 18 O lw−corr record resumes its pronounced increase around 14 600 cal BP. This further cumulative enrichment in 18 O of lake water could be interpreted as response to strengthened wind-driven evaporation as induced by the intensification and establishment of the SHW at the latitude of Laguna Potrok Aike (52 • S) since 14 600 cal BP.

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Fluctuations of the Última Esperanza ice lobe (52°S), Chilean Patagonia, during the last glacial maximum and termination 1

Cited by 89 publications

References 71 publications

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Climate history of the Southern Hemisphere Westerlies belt during the last glacial–interglacial transition revealed from lake water oxygen isotope reconstruction of Laguna Potrok Aike (52° S, Argentina)

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