Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation
We have analyzed an almost 14,000 year old peat sequence on the island of Isla de los Estados (55 degrees S. 64 degrees W), east of Tierra del Fuego, in the core of the Southern Hemisphere Westerlies. A multitude of methods have been used: high resolution C-14 dating; detailed lithologic description...
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Online Access: | https://lup.lub.lu.se/record/2903191 https://doi.org/10.1016/j.quascirev.2012.03.015 |
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ftulundlup:oai:lup.lub.lu.se:fa1d931f-2ddd-45a1-826b-240af986a995 2023-05-15T13:35:34+02:00 Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation Björck, Svante Rundgren, Mats Ljung, Karl Unkel, Ingmar Wallin, Åsa 2012 https://lup.lub.lu.se/record/2903191 https://doi.org/10.1016/j.quascirev.2012.03.015 eng eng Elsevier https://lup.lub.lu.se/record/2903191 http://dx.doi.org/10.1016/j.quascirev.2012.03.015 wos:000304851100001 scopus:84859937240 Quaternary Science Reviews; 42, pp 1-14 (2012) ISSN: 0277-3791 Geology Paleoclimate Tierra del Fuego South Atlantic Southern Hemisphere Westerlies Aeolian proxies Pollen analysis Last deglaciation Holocene contributiontojournal/article info:eu-repo/semantics/article text 2012 ftulundlup https://doi.org/10.1016/j.quascirev.2012.03.015 2023-02-01T23:29:22Z We have analyzed an almost 14,000 year old peat sequence on the island of Isla de los Estados (55 degrees S. 64 degrees W), east of Tierra del Fuego, in the core of the Southern Hemisphere Westerlies. A multitude of methods have been used: high resolution C-14 dating; detailed lithologic descriptions including humification degree; loss on ignition; magnetic susceptibility; bulk density; pollen and spore analysis and determination of Aeolian sand influx. By combining proxies for wind and precipitation we have been able to reconstruct how the westerlies have varied over time in the Atlantic sector of the Southern Ocean. It shows that this westerly wind belt was most intense at the onset of the record, 13,600-13,200 cal BP, coinciding with the mid to late part of the Antarctic Cold Reversal, followed by a gradual decline. At 12,200 cal BP the westerlies seem to have shifted to a position south of Tierra del Fuego and this phase, the calmest and driest period on the island throughout the sequence, ended at 10,000 cal BP when the westerlies moved equatorward again. Since then the westerlies have been present but with a variable impact on the 55 degrees S latitude of the Atlantic. Mostly conditions have been fairly similar to today, but occasionally with a wider or narrower and/or weaker or stronger wind belt. At 7200 cal BP wind intensity began to increase and between 4500 and 3500 cal BP these southern latitudes experienced a distinct wind and precipitation maximum, both in terms of perseverance and intensity. Our results show a both wide and strong wind belt, with possible niveo-aeolian activity in Tierra del Fuego in winter, and possibly creating milder summers around the Antarctic Peninsula. In the later part of the Holocene, expansion contraction phases of the wind belt, especially in winter, seem to have been a common phenomenon. (C) 2012 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Tierra del Fuego Lund University Publications (LUP) Antarctic Antarctic Peninsula Perseverance ENVELOPE(162.200,162.200,-76.800,-76.800) Southern Ocean The Antarctic Quaternary Science Reviews 42 1 14 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Paleoclimate Tierra del Fuego South Atlantic Southern Hemisphere Westerlies Aeolian proxies Pollen analysis Last deglaciation Holocene |
spellingShingle |
Geology Paleoclimate Tierra del Fuego South Atlantic Southern Hemisphere Westerlies Aeolian proxies Pollen analysis Last deglaciation Holocene Björck, Svante Rundgren, Mats Ljung, Karl Unkel, Ingmar Wallin, Åsa Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation |
topic_facet |
Geology Paleoclimate Tierra del Fuego South Atlantic Southern Hemisphere Westerlies Aeolian proxies Pollen analysis Last deglaciation Holocene |
description |
We have analyzed an almost 14,000 year old peat sequence on the island of Isla de los Estados (55 degrees S. 64 degrees W), east of Tierra del Fuego, in the core of the Southern Hemisphere Westerlies. A multitude of methods have been used: high resolution C-14 dating; detailed lithologic descriptions including humification degree; loss on ignition; magnetic susceptibility; bulk density; pollen and spore analysis and determination of Aeolian sand influx. By combining proxies for wind and precipitation we have been able to reconstruct how the westerlies have varied over time in the Atlantic sector of the Southern Ocean. It shows that this westerly wind belt was most intense at the onset of the record, 13,600-13,200 cal BP, coinciding with the mid to late part of the Antarctic Cold Reversal, followed by a gradual decline. At 12,200 cal BP the westerlies seem to have shifted to a position south of Tierra del Fuego and this phase, the calmest and driest period on the island throughout the sequence, ended at 10,000 cal BP when the westerlies moved equatorward again. Since then the westerlies have been present but with a variable impact on the 55 degrees S latitude of the Atlantic. Mostly conditions have been fairly similar to today, but occasionally with a wider or narrower and/or weaker or stronger wind belt. At 7200 cal BP wind intensity began to increase and between 4500 and 3500 cal BP these southern latitudes experienced a distinct wind and precipitation maximum, both in terms of perseverance and intensity. Our results show a both wide and strong wind belt, with possible niveo-aeolian activity in Tierra del Fuego in winter, and possibly creating milder summers around the Antarctic Peninsula. In the later part of the Holocene, expansion contraction phases of the wind belt, especially in winter, seem to have been a common phenomenon. (C) 2012 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Björck, Svante Rundgren, Mats Ljung, Karl Unkel, Ingmar Wallin, Åsa |
author_facet |
Björck, Svante Rundgren, Mats Ljung, Karl Unkel, Ingmar Wallin, Åsa |
author_sort |
Björck, Svante |
title |
Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation |
title_short |
Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation |
title_full |
Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation |
title_fullStr |
Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation |
title_full_unstemmed |
Multi-proxy analyses of a peat bog on Isla de los Estados, easternmost Tierra del Fuego: a unique record of the variable Southern Hemisphere Westerlies since the last deglaciation |
title_sort |
multi-proxy analyses of a peat bog on isla de los estados, easternmost tierra del fuego: a unique record of the variable southern hemisphere westerlies since the last deglaciation |
publisher |
Elsevier |
publishDate |
2012 |
url |
https://lup.lub.lu.se/record/2903191 https://doi.org/10.1016/j.quascirev.2012.03.015 |
long_lat |
ENVELOPE(162.200,162.200,-76.800,-76.800) |
geographic |
Antarctic Antarctic Peninsula Perseverance Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Perseverance Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Tierra del Fuego |
op_source |
Quaternary Science Reviews; 42, pp 1-14 (2012) ISSN: 0277-3791 |
op_relation |
https://lup.lub.lu.se/record/2903191 http://dx.doi.org/10.1016/j.quascirev.2012.03.015 wos:000304851100001 scopus:84859937240 |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.03.015 |
container_title |
Quaternary Science Reviews |
container_volume |
42 |
container_start_page |
1 |
op_container_end_page |
14 |
_version_ |
1766067261484826624 |