The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 ° 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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fttriple:oai:gotriple.eu:10670/1.7kzsmk 2023-05-15T13:59:11+02:00 The Last Termination in the South Indian Ocean: A unique terrestrial record from Kerguelen Islands (49 ° S) situated within the Southern Hemisphere westerly belt Van Der Putten, Nathalie Verbruggen, Cyriel Bjorck, Svante Michel, Elisabeth Disnar, Jean-robert Chapron, Emmanuel Moine, Bertrand N. De Beaulieu, Jacques-louis https://doi.org/10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg en eng Pergamon-elsevier Science Ltd doi:10.1016/j.quascirev.2015.05.010 10670/1.7kzsmk https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg other Archimer, archive institutionnelle de l'Ifremer Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2015-08 , Vol. 122 , P. 142-157 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.quascirev.2015.05.010 2023-01-22T18:37:37Z 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. ... Text Antarc* Antarctic Antarctica EPICA ice core Kerguelen Islands Southern Ocean Unknown 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 |
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English |
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geo envir Van Der Putten, Nathalie Verbruggen, Cyriel Bjorck, 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 ° S) situated within the Southern Hemisphere westerly belt |
topic_facet |
geo envir |
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 |
Text |
author |
Van Der Putten, Nathalie Verbruggen, Cyriel Bjorck, Svante Michel, Elisabeth Disnar, Jean-robert Chapron, Emmanuel Moine, Bertrand N. De Beaulieu, Jacques-louis |
author_facet |
Van Der Putten, Nathalie Verbruggen, Cyriel Bjorck, 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 ° 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 ° 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 ° 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 ° 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 ° 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 ° s) situated within the southern hemisphere westerly belt |
publisher |
Pergamon-elsevier Science Ltd |
url |
https://doi.org/10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg |
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 |
Archimer, archive institutionnelle de l'Ifremer Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2015-08 , Vol. 122 , P. 142-157 |
op_relation |
doi:10.1016/j.quascirev.2015.05.010 10670/1.7kzsmk https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg |
op_rights |
other |
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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1766267661677756416 |