The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S)
Few studies have examined in detail the sequence of events during the last glacial termination (T1) in the core sector of the Patagonian Ice Sheet (PIS), the largest ice mass in the Southern Hemisphere outside of Antarctica. Here we report results from Lago Edita (47°8′ S, 72°25′ W, 570 m a.s.l.), a...
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Copernicus Publications
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ftdoajarticles:oai:doaj.org/article:7de229c033aa47fa94591b2da6319a46 2023-05-15T13:52:02+02:00 The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) W. I. Henríquez R. Villa-Martínez I. Vilanova R. De Pol-Holz P. I. Moreno 2017-07-01T00:00:00Z https://doi.org/10.5194/cp-13-879-2017 https://doaj.org/article/7de229c033aa47fa94591b2da6319a46 EN eng Copernicus Publications https://www.clim-past.net/13/879/2017/cp-13-879-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-879-2017 1814-9324 1814-9332 https://doaj.org/article/7de229c033aa47fa94591b2da6319a46 Climate of the Past, Vol 13, Pp 879-895 (2017) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/cp-13-879-2017 2022-12-31T07:02:49Z Few studies have examined in detail the sequence of events during the last glacial termination (T1) in the core sector of the Patagonian Ice Sheet (PIS), the largest ice mass in the Southern Hemisphere outside of Antarctica. Here we report results from Lago Edita (47°8′ S, 72°25′ W, 570 m a.s.l.), a small closed-basin lake located in a valley overridden by eastward-flowing Andean glaciers during the Last Glacial Maximum (LGM). The Lago Edita record shows glaciolacustrine sedimentation until 19 400 yr BP, followed by organic sedimentation in a closed-basin lake and a mosaic of cold-resistant hygrophilous conifers and rainforest trees, along with alpine herbs between 19 400 and 11 000 yr BP. Our data suggest that the PIS retreated at least ∼ 90 km from its LGM limit between ∼ 21 000 and 19 400 yr BP and that scattered, low-density populations of cold-resistant hygrophilous conifers, rainforest trees, high-Andean and steppe herbs thrived east of the Andes during the LGM and T1, implying high precipitation levels and southern westerly wind (SWW) influence at 47° S. The conifer Podocarpus nubigena increased between 14 500 and 13 000 yr BP, suggesting even stronger SWW influence during the Antarctic Cold Reversal, after which it declined and persisted until 11 000 yr BP. Large increases in arboreal pollen at ∼ 13 000 and ∼ 11 000 yr BP led to the establishment of forests near Lago Edita between 10 000 and 9000 yr BP, suggesting a rise in the regional tree line along the eastern Andean slopes driven by warming pulses at ∼ 13 000 and ∼ 11 000 yr BP and a subsequent decline in SWW influence at ∼ 11 000 yr BP. We propose that the PIS imposed a regional cooling signal along its eastern, downwind margin through T1 that lasted until the separation of the northern and southern Patagonian ice fields along the Andes during the Younger Dryas period. We posit that the withdrawal of glacial and associated glaciolacustrine environments through T1 provided a route for the dispersal of hygrophilous trees and herbs from the eastern ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Basin Lake ENVELOPE(161.917,161.917,-76.150,-76.150) Climate of the Past 13 7 879 895 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 W. I. Henríquez R. Villa-Martínez I. Vilanova R. De Pol-Holz P. I. Moreno The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Few studies have examined in detail the sequence of events during the last glacial termination (T1) in the core sector of the Patagonian Ice Sheet (PIS), the largest ice mass in the Southern Hemisphere outside of Antarctica. Here we report results from Lago Edita (47°8′ S, 72°25′ W, 570 m a.s.l.), a small closed-basin lake located in a valley overridden by eastward-flowing Andean glaciers during the Last Glacial Maximum (LGM). The Lago Edita record shows glaciolacustrine sedimentation until 19 400 yr BP, followed by organic sedimentation in a closed-basin lake and a mosaic of cold-resistant hygrophilous conifers and rainforest trees, along with alpine herbs between 19 400 and 11 000 yr BP. Our data suggest that the PIS retreated at least ∼ 90 km from its LGM limit between ∼ 21 000 and 19 400 yr BP and that scattered, low-density populations of cold-resistant hygrophilous conifers, rainforest trees, high-Andean and steppe herbs thrived east of the Andes during the LGM and T1, implying high precipitation levels and southern westerly wind (SWW) influence at 47° S. The conifer Podocarpus nubigena increased between 14 500 and 13 000 yr BP, suggesting even stronger SWW influence during the Antarctic Cold Reversal, after which it declined and persisted until 11 000 yr BP. Large increases in arboreal pollen at ∼ 13 000 and ∼ 11 000 yr BP led to the establishment of forests near Lago Edita between 10 000 and 9000 yr BP, suggesting a rise in the regional tree line along the eastern Andean slopes driven by warming pulses at ∼ 13 000 and ∼ 11 000 yr BP and a subsequent decline in SWW influence at ∼ 11 000 yr BP. We propose that the PIS imposed a regional cooling signal along its eastern, downwind margin through T1 that lasted until the separation of the northern and southern Patagonian ice fields along the Andes during the Younger Dryas period. We posit that the withdrawal of glacial and associated glaciolacustrine environments through T1 provided a route for the dispersal of hygrophilous trees and herbs from the eastern ... |
format |
Article in Journal/Newspaper |
author |
W. I. Henríquez R. Villa-Martínez I. Vilanova R. De Pol-Holz P. I. Moreno |
author_facet |
W. I. Henríquez R. Villa-Martínez I. Vilanova R. De Pol-Holz P. I. Moreno |
author_sort |
W. I. Henríquez |
title |
The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) |
title_short |
The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) |
title_full |
The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) |
title_fullStr |
The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) |
title_full_unstemmed |
The last glacial termination on the eastern flank of the central Patagonian Andes (47 ° S) |
title_sort |
last glacial termination on the eastern flank of the central patagonian andes (47 ° s) |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/cp-13-879-2017 https://doaj.org/article/7de229c033aa47fa94591b2da6319a46 |
long_lat |
ENVELOPE(161.917,161.917,-76.150,-76.150) |
geographic |
Antarctic The Antarctic Basin Lake |
geographic_facet |
Antarctic The Antarctic Basin Lake |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Climate of the Past, Vol 13, Pp 879-895 (2017) |
op_relation |
https://www.clim-past.net/13/879/2017/cp-13-879-2017.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-13-879-2017 1814-9324 1814-9332 https://doaj.org/article/7de229c033aa47fa94591b2da6319a46 |
op_doi |
https://doi.org/10.5194/cp-13-879-2017 |
container_title |
Climate of the Past |
container_volume |
13 |
container_issue |
7 |
container_start_page |
879 |
op_container_end_page |
895 |
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1766256223595790336 |