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...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Pergamon-elsevier Science Ltd
2015
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg https://doi.org/10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/ |
id |
ftarchimer:oai:archimer.ifremer.fr:60843 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:60843 2023-05-15T13:47:36+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 2015-08 application/pdf https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg https://doi.org/10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/ eng eng Pergamon-elsevier Science Ltd https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg doi:10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/ info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2015-08 , Vol. 122 , P. 142-157 Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal Southern Hemisphere westerly belt text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1016/j.quascirev.2015.05.010 2021-09-23T20:32:46Z 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. Kerguelen Islands became less influenced by the Southern Hemisphere westerly winds and these conditions were amplified during the early Holocene climate optimum as found in Antarctic ice core records. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Kerguelen Islands Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) 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 |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal Southern Hemisphere westerly belt |
spellingShingle |
Palaeoclimatology Last Termination Peat record Kerguelen Islands Southern Ocean Indian Ocean Oceanic Cold Reversal 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 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 |
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. Kerguelen Islands became less influenced by the Southern Hemisphere westerly winds and these conditions were amplified during the early Holocene climate optimum as found in Antarctic ice core records. |
format |
Article in Journal/Newspaper |
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 |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg https://doi.org/10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/ |
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 (0277-3791) (Pergamon-elsevier Science Ltd), 2015-08 , Vol. 122 , P. 142-157 |
op_relation |
https://archimer.ifremer.fr/doc/00497/60843/64283.pdf https://archimer.ifremer.fr/doc/00497/60843/64284.jpg doi:10.1016/j.quascirev.2015.05.010 https://archimer.ifremer.fr/doc/00497/60843/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
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 |
_version_ |
1766247509115535360 |