Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego
The island of Isla de los Estados is situated at 54.5 degrees S, 64 degrees W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recordin...
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ftulundlup:oai:lup.lub.lu.se:df2dfb55-cf64-4431-8510-75634df5f655 2023-05-15T13:39:36+02:00 Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego Unkel, Ingmar Björck, Svante Wohlfarth, Barbara 2008 https://lup.lub.lu.se/record/1411417 https://doi.org/10.1016/j.quascirev.2008.05.004 eng eng Elsevier https://lup.lub.lu.se/record/1411417 http://dx.doi.org/10.1016/j.quascirev.2008.05.004 wos:000259017900006 scopus:48349092657 Quaternary Science Reviews; 27(15-16), pp 1541-1554 (2008) ISSN: 0277-3791 Geology LAGUNA POTROK-AIKE LAST GLACIAL PERIOD CAL KYR BP HOLOCENE CLIMATE BIPOLAR SEESAW ICE-CORE LACUSTRINE GREENLAND ATLANTIC SECTOR RECORD SOUTHERNMOST SOUTH-AMERICA contributiontojournal/article info:eu-repo/semantics/article text 2008 ftulundlup https://doi.org/10.1016/j.quascirev.2008.05.004 2023-02-01T23:28:24Z The island of Isla de los Estados is situated at 54.5 degrees S, 64 degrees W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric conditions but within an oceanic setting, can help to clarify changes of regional circulation patterns, both atmospheric and marine. Here, we present geochemical analyses from 16-10 ka cal BP of a peat core from Lago Galvarne Bog at the northern coast of the island, and a lake sediment core from Laguna Cascada 3 kin further south. The data comprise TC, TN, loss on ignition analyses and continuous XRF scanning on both cores as well as age-depth modeling based on AMS-C-14 dating. Deglaciation and onset of peat formation in the coastal areas began before 16 ka cal BP followed by a rapid glacial retreat and the start of lacustrine sedimentation further inland. Data Suggest initially windy conditions with permafrost succeeded by gradually warmer and wetter conditions until ca 14.5 ka cal BP. The warming trend slows down until ca 13.5 ka cal BP, followed by arid conditions culminating around 12.8 ka cal BP. Our data suggest fairly warm conditions and the establishment of denser peat and forest vegetation ca 10.6 ka cal BP, contemporaneous with the onset of the Antarctic thermal optimum. This indicates large-scale shifts in the placement of zonal flow and the Westerlies at the beginning of the Holocene. (C) 2008 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Ice ice core permafrost Tierra del Fuego Lund University Publications (LUP) Antarctic Greenland The Antarctic Quaternary Science Reviews 27 15-16 1541 1554 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology LAGUNA POTROK-AIKE LAST GLACIAL PERIOD CAL KYR BP HOLOCENE CLIMATE BIPOLAR SEESAW ICE-CORE LACUSTRINE GREENLAND ATLANTIC SECTOR RECORD SOUTHERNMOST SOUTH-AMERICA |
spellingShingle |
Geology LAGUNA POTROK-AIKE LAST GLACIAL PERIOD CAL KYR BP HOLOCENE CLIMATE BIPOLAR SEESAW ICE-CORE LACUSTRINE GREENLAND ATLANTIC SECTOR RECORD SOUTHERNMOST SOUTH-AMERICA Unkel, Ingmar Björck, Svante Wohlfarth, Barbara Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego |
topic_facet |
Geology LAGUNA POTROK-AIKE LAST GLACIAL PERIOD CAL KYR BP HOLOCENE CLIMATE BIPOLAR SEESAW ICE-CORE LACUSTRINE GREENLAND ATLANTIC SECTOR RECORD SOUTHERNMOST SOUTH-AMERICA |
description |
The island of Isla de los Estados is situated at 54.5 degrees S, 64 degrees W, east of Argentinian Tierra del Fuego, and is located in a sensitive geographic position in relation to the zonal circulation between Antarctica and South America. Its terrestrial records of the last deglaciation, recording atmospheric conditions but within an oceanic setting, can help to clarify changes of regional circulation patterns, both atmospheric and marine. Here, we present geochemical analyses from 16-10 ka cal BP of a peat core from Lago Galvarne Bog at the northern coast of the island, and a lake sediment core from Laguna Cascada 3 kin further south. The data comprise TC, TN, loss on ignition analyses and continuous XRF scanning on both cores as well as age-depth modeling based on AMS-C-14 dating. Deglaciation and onset of peat formation in the coastal areas began before 16 ka cal BP followed by a rapid glacial retreat and the start of lacustrine sedimentation further inland. Data Suggest initially windy conditions with permafrost succeeded by gradually warmer and wetter conditions until ca 14.5 ka cal BP. The warming trend slows down until ca 13.5 ka cal BP, followed by arid conditions culminating around 12.8 ka cal BP. Our data suggest fairly warm conditions and the establishment of denser peat and forest vegetation ca 10.6 ka cal BP, contemporaneous with the onset of the Antarctic thermal optimum. This indicates large-scale shifts in the placement of zonal flow and the Westerlies at the beginning of the Holocene. (C) 2008 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Unkel, Ingmar Björck, Svante Wohlfarth, Barbara |
author_facet |
Unkel, Ingmar Björck, Svante Wohlfarth, Barbara |
author_sort |
Unkel, Ingmar |
title |
Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego |
title_short |
Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego |
title_full |
Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego |
title_fullStr |
Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego |
title_full_unstemmed |
Deglacial environmental changes on Isla de los Estados (54.4°S), southeastern Tierra del Fuego |
title_sort |
deglacial environmental changes on isla de los estados (54.4°s), southeastern tierra del fuego |
publisher |
Elsevier |
publishDate |
2008 |
url |
https://lup.lub.lu.se/record/1411417 https://doi.org/10.1016/j.quascirev.2008.05.004 |
geographic |
Antarctic Greenland The Antarctic |
geographic_facet |
Antarctic Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctica Greenland Ice ice core permafrost Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice ice core permafrost Tierra del Fuego |
op_source |
Quaternary Science Reviews; 27(15-16), pp 1541-1554 (2008) ISSN: 0277-3791 |
op_relation |
https://lup.lub.lu.se/record/1411417 http://dx.doi.org/10.1016/j.quascirev.2008.05.004 wos:000259017900006 scopus:48349092657 |
op_doi |
https://doi.org/10.1016/j.quascirev.2008.05.004 |
container_title |
Quaternary Science Reviews |
container_volume |
27 |
container_issue |
15-16 |
container_start_page |
1541 |
op_container_end_page |
1554 |
_version_ |
1766120575627952128 |