Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development
Upper water column dynamics in the southern South China Sea were reconstructed in order to track changes in the activity of the East Asian winter monsoon (EAWM) since the Last Glacial Maximum. We used the difference in the stable oxygen isotopes (Delta delta O-18) and Mg/Ca-based temperatures (Delta...
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Amer Geophysical Union
2010
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ftarchimer:oai:archimer.ifremer.fr:34204 2023-05-15T18:01:00+02:00 Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development Steinke, Stephan Mohtadi, Mahyar Groeneveld, Jeroen Lin, Li-chuan Lowemark, Ludvig Chen, Min-te Rendle-buehring, Rebecca 2010-06 application/pdf https://archimer.ifremer.fr/doc/00231/34204/32845.pdf https://archimer.ifremer.fr/doc/00231/34204/32846.pdf https://doi.org/10.1029/2009PA001850 https://archimer.ifremer.fr/doc/00231/34204/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00231/34204/32845.pdf https://archimer.ifremer.fr/doc/00231/34204/32846.pdf doi:10.1029/2009PA001850 https://archimer.ifremer.fr/doc/00231/34204/ Copyright 2010 by the American Geophysical Union info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2010-06 , Vol. 25 , N. 2 / PA2219 , P. 1-15 text Publication info:eu-repo/semantics/article 2010 ftarchimer https://doi.org/10.1029/2009PA001850 2021-09-23T20:25:14Z Upper water column dynamics in the southern South China Sea were reconstructed in order to track changes in the activity of the East Asian winter monsoon (EAWM) since the Last Glacial Maximum. We used the difference in the stable oxygen isotopes (Delta delta O-18) and Mg/Ca-based temperatures (Delta T) of surface-dwelling (G. ruber) and thermocline-dwelling (P. obliquiloculata) planktonic foraminifera and the temperature difference between alkenone- and P. obliquiloculata Mg/Ca-based temperatures to estimate the upper ocean thermal gradient at International Marine Past Global Change Study (IMAGES) core MD01-2390. Estimates of the upper ocean thermal gradient were used to reconstruct mixed layer dynamics. We find that our Delta delta O-18 estimates are biased by changes in salinity and, thus, do not display a true upper ocean thermal gradient. The Delta T of G. ruber and P. obliquiloculata as well as the alkenone- and P. obliquiloculata suggest increased surface water mixing during the late glacial, likely due to enhanced EAWM winds. Surface water mixing was weaker during the late Holocene, indicating a weaker influence of winter monsoon winds. The weakest winter monsoon activity occurred between 6.5 ka and 2.5 ka. Inferred EAWM changes since the Last Glacial Maximum coincide with EAWM changes as recorded in Chinese loess sediments. We find that the intensity of the EAWM and the East Asian summer monsoon show an inverse behavior during the last glacial and deglaciation but covaried during the middle to late Holocene. Article in Journal/Newspaper Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 25 2 |
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 |
description |
Upper water column dynamics in the southern South China Sea were reconstructed in order to track changes in the activity of the East Asian winter monsoon (EAWM) since the Last Glacial Maximum. We used the difference in the stable oxygen isotopes (Delta delta O-18) and Mg/Ca-based temperatures (Delta T) of surface-dwelling (G. ruber) and thermocline-dwelling (P. obliquiloculata) planktonic foraminifera and the temperature difference between alkenone- and P. obliquiloculata Mg/Ca-based temperatures to estimate the upper ocean thermal gradient at International Marine Past Global Change Study (IMAGES) core MD01-2390. Estimates of the upper ocean thermal gradient were used to reconstruct mixed layer dynamics. We find that our Delta delta O-18 estimates are biased by changes in salinity and, thus, do not display a true upper ocean thermal gradient. The Delta T of G. ruber and P. obliquiloculata as well as the alkenone- and P. obliquiloculata suggest increased surface water mixing during the late glacial, likely due to enhanced EAWM winds. Surface water mixing was weaker during the late Holocene, indicating a weaker influence of winter monsoon winds. The weakest winter monsoon activity occurred between 6.5 ka and 2.5 ka. Inferred EAWM changes since the Last Glacial Maximum coincide with EAWM changes as recorded in Chinese loess sediments. We find that the intensity of the EAWM and the East Asian summer monsoon show an inverse behavior during the last glacial and deglaciation but covaried during the middle to late Holocene. |
format |
Article in Journal/Newspaper |
author |
Steinke, Stephan Mohtadi, Mahyar Groeneveld, Jeroen Lin, Li-chuan Lowemark, Ludvig Chen, Min-te Rendle-buehring, Rebecca |
spellingShingle |
Steinke, Stephan Mohtadi, Mahyar Groeneveld, Jeroen Lin, Li-chuan Lowemark, Ludvig Chen, Min-te Rendle-buehring, Rebecca Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development |
author_facet |
Steinke, Stephan Mohtadi, Mahyar Groeneveld, Jeroen Lin, Li-chuan Lowemark, Ludvig Chen, Min-te Rendle-buehring, Rebecca |
author_sort |
Steinke, Stephan |
title |
Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development |
title_short |
Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development |
title_full |
Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development |
title_fullStr |
Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development |
title_full_unstemmed |
Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development |
title_sort |
reconstructing the southern south china sea upper water column structure since the last glacial maximum: implications for the east asian winter monsoon development |
publisher |
Amer Geophysical Union |
publishDate |
2010 |
url |
https://archimer.ifremer.fr/doc/00231/34204/32845.pdf https://archimer.ifremer.fr/doc/00231/34204/32846.pdf https://doi.org/10.1029/2009PA001850 https://archimer.ifremer.fr/doc/00231/34204/ |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2010-06 , Vol. 25 , N. 2 / PA2219 , P. 1-15 |
op_relation |
https://archimer.ifremer.fr/doc/00231/34204/32845.pdf https://archimer.ifremer.fr/doc/00231/34204/32846.pdf doi:10.1029/2009PA001850 https://archimer.ifremer.fr/doc/00231/34204/ |
op_rights |
Copyright 2010 by the American Geophysical Union info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2009PA001850 |
container_title |
Paleoceanography |
container_volume |
25 |
container_issue |
2 |
_version_ |
1766170317664813056 |