The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt
The awareness of the significance of the Southern Ocean in the Earth's climate system has become increasingly obvious. The deglacial atmospheric CO2 rise during warming periods in Antarctica has been attributed to CO2 ventilation from the deep ocean caused by enhanced upwelling around the Antar...
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Online Access: | https://lup.lub.lu.se/record/7773630 https://doi.org/10.1016/j.quascirev.2015.05.010 |
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ftulundlup:oai:lup.lub.lu.se:3dd81cd1-6440-4b21-bfc5-4a1d8e90b29e 2023-05-15T13:50:27+02:00 The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt Van der Putten, Nathalie Verbruggen, Cyriel Björck, Svante Michel, Elisabeth Disnar, Jean-Robert Chapron, Emmanuel Moine, Bertrand N. de Beaulieu, Jacques-Louis 2015 https://lup.lub.lu.se/record/7773630 https://doi.org/10.1016/j.quascirev.2015.05.010 eng eng Elsevier https://lup.lub.lu.se/record/7773630 http://dx.doi.org/10.1016/j.quascirev.2015.05.010 wos:000358097300009 scopus:84934955812 Quaternary Science Reviews; 122, pp 142-157 (2015) ISSN: 0277-3791 Geology Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal Southern Hemisphere westerly belt contributiontojournal/article info:eu-repo/semantics/article text 2015 ftulundlup https://doi.org/10.1016/j.quascirev.2015.05.010 2023-02-01T23:29:05Z The awareness of the significance of the Southern Ocean in the Earth's climate system has become increasingly obvious. The deglacial atmospheric CO2 rise during warming periods in Antarctica has been attributed to CO2 ventilation from the deep ocean caused by enhanced upwelling around the Antarctic Divergence. It has been hypothesized that, more intense Southern Hemisphere westerly winds aligned with the Antarctic Circumpolar Current due to a southward shift of the wind belt from its Last Glacial Maximum equator-ward position, are the main drivers. Reconstructions of past changes in atmospheric circulation in the Southern Hemisphere are still scarce and the overall picture is patchy with sometimes contradictory results. For obvious reasons, most terrestrial records originate from southern South America and New Zealand. Here we present a terrestrial record from the Indian sector of the Southern Ocean, from Kerguelen Islands located at 49 degrees S. A peat record is investigated using a multi-proxy approach (pollen and plant macrofossils, magnetic susceptibility, XRF analyses, biogenic silica content, Rock-Eval6 analysis and humification degree). Peat accumulation starts at about 16,000 cal yr BP with relatively warm and dry conditions. The most prominent change in our proxy data occurs at 13,600 cal yr BP, when peat ponds were established on the peat surface, resulting in lacustrine-type deposits, as a result of very high humidity, and with proxies implying very windy conditions. Within chronological uncertainties, this onset coincides with the onset of the so-called Oceanic Cold Reversal, based on the deuterium excess data in the EPICA Dome C ice core record. Kerguelen Islands are located in the moisture source area of Dome C and a change in atmospheric circulation at that time could explain both records. Around 12,900 cal yr BP, at the end of the Antarctic Cold Reversal, pond/lake sediments give way to more peaty deposits, with proxies suggesting slightly drier, less windy and probably warmer conditions. ... Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Kerguelen Islands Southern Ocean Lund University Publications (LUP) Antarctic Indian Kerguelen Kerguelen Islands New Zealand Pond Lake ENVELOPE(-126.692,-126.692,56.046,56.046) Southern Ocean The Antarctic Quaternary Science Reviews 122 142 157 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal Southern Hemisphere westerly belt |
spellingShingle |
Geology Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal Southern Hemisphere westerly belt Van der Putten, Nathalie Verbruggen, Cyriel Björck, Svante Michel, Elisabeth Disnar, Jean-Robert Chapron, Emmanuel Moine, Bertrand N. de Beaulieu, Jacques-Louis The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt |
topic_facet |
Geology Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal Southern Hemisphere westerly belt |
description |
The awareness of the significance of the Southern Ocean in the Earth's climate system has become increasingly obvious. The deglacial atmospheric CO2 rise during warming periods in Antarctica has been attributed to CO2 ventilation from the deep ocean caused by enhanced upwelling around the Antarctic Divergence. It has been hypothesized that, more intense Southern Hemisphere westerly winds aligned with the Antarctic Circumpolar Current due to a southward shift of the wind belt from its Last Glacial Maximum equator-ward position, are the main drivers. Reconstructions of past changes in atmospheric circulation in the Southern Hemisphere are still scarce and the overall picture is patchy with sometimes contradictory results. For obvious reasons, most terrestrial records originate from southern South America and New Zealand. Here we present a terrestrial record from the Indian sector of the Southern Ocean, from Kerguelen Islands located at 49 degrees S. A peat record is investigated using a multi-proxy approach (pollen and plant macrofossils, magnetic susceptibility, XRF analyses, biogenic silica content, Rock-Eval6 analysis and humification degree). Peat accumulation starts at about 16,000 cal yr BP with relatively warm and dry conditions. The most prominent change in our proxy data occurs at 13,600 cal yr BP, when peat ponds were established on the peat surface, resulting in lacustrine-type deposits, as a result of very high humidity, and with proxies implying very windy conditions. Within chronological uncertainties, this onset coincides with the onset of the so-called Oceanic Cold Reversal, based on the deuterium excess data in the EPICA Dome C ice core record. Kerguelen Islands are located in the moisture source area of Dome C and a change in atmospheric circulation at that time could explain both records. Around 12,900 cal yr BP, at the end of the Antarctic Cold Reversal, pond/lake sediments give way to more peaty deposits, with proxies suggesting slightly drier, less windy and probably warmer conditions. ... |
format |
Article in Journal/Newspaper |
author |
Van der Putten, Nathalie Verbruggen, Cyriel Björck, Svante Michel, Elisabeth Disnar, Jean-Robert Chapron, Emmanuel Moine, Bertrand N. de Beaulieu, Jacques-Louis |
author_facet |
Van der Putten, Nathalie Verbruggen, Cyriel Björck, Svante Michel, Elisabeth Disnar, Jean-Robert Chapron, Emmanuel Moine, Bertrand N. de Beaulieu, Jacques-Louis |
author_sort |
Van der Putten, Nathalie |
title |
The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt |
title_short |
The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt |
title_full |
The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt |
title_fullStr |
The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt |
title_full_unstemmed |
The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 degrees S) situated within the Southern Hemisphere westerly belt |
title_sort |
last termination in the south indian ocean: a unique terrestrial record from kerguelen islands (49 degrees s) situated within the southern hemisphere westerly belt |
publisher |
Elsevier |
publishDate |
2015 |
url |
https://lup.lub.lu.se/record/7773630 https://doi.org/10.1016/j.quascirev.2015.05.010 |
long_lat |
ENVELOPE(-126.692,-126.692,56.046,56.046) |
geographic |
Antarctic Indian Kerguelen Kerguelen Islands New Zealand Pond Lake Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Kerguelen Kerguelen Islands New Zealand Pond Lake Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica EPICA ice core Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Kerguelen Islands Southern Ocean |
op_source |
Quaternary Science Reviews; 122, pp 142-157 (2015) ISSN: 0277-3791 |
op_relation |
https://lup.lub.lu.se/record/7773630 http://dx.doi.org/10.1016/j.quascirev.2015.05.010 wos:000358097300009 scopus:84934955812 |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.05.010 |
container_title |
Quaternary Science Reviews |
container_volume |
122 |
container_start_page |
142 |
op_container_end_page |
157 |
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1766253512866398208 |