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 (Δδ18O) and Mg/Ca-based temperatures (ΔT) of surface-d...
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ftstockholmuniv:oai:DiVA.org:su-47365 2023-05-15T17:35:38+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 Groeneveld, J Mohtadi, M Lin, L.-C. Löwemark, Ludvig Chen, M.-T. Rendle-Buehring, R 2010 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47365 https://doi.org/10.1029/2009PA001850 eng eng Institutionen för geologiska vetenskaper Paleoceanography, 0883-8305, 2010, 25, s. PA2219- http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47365 doi:10.1029/2009PA001850 ISI:000279314900001 info:eu-repo/semantics/openAccess LIVING PLANKTONIC-FORAMINIFERA RADIOCARBON AGE CALIBRATION SURFACE TEMPERATURE RECORD ISOTOPIC COMPOSITION VERTICAL-DISTRIBUTION MILLENNIAL-SCALE LATE PLEISTOCENE SEDIMENT TRAPS NORTH-ATLANTIC EARLY HOLOCENE Natural Sciences Naturvetenskap Article in journal info:eu-repo/semantics/article text 2010 ftstockholmuniv https://doi.org/10.1029/2009PA001850 2023-02-23T21:42:18Z 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 (Δδ18O) and Mg/Ca-based temperatures (ΔT) 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 Δδ18O estimates are biased by changes in salinity and, thus, do not display a true upper ocean thermal gradient. The ΔT 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. authorCount :7 Article in Journal/Newspaper North Atlantic Planktonic foraminifera Stockholm University: Publications (DiVA) Paleoceanography 25 2 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
LIVING PLANKTONIC-FORAMINIFERA RADIOCARBON AGE CALIBRATION SURFACE TEMPERATURE RECORD ISOTOPIC COMPOSITION VERTICAL-DISTRIBUTION MILLENNIAL-SCALE LATE PLEISTOCENE SEDIMENT TRAPS NORTH-ATLANTIC EARLY HOLOCENE Natural Sciences Naturvetenskap |
spellingShingle |
LIVING PLANKTONIC-FORAMINIFERA RADIOCARBON AGE CALIBRATION SURFACE TEMPERATURE RECORD ISOTOPIC COMPOSITION VERTICAL-DISTRIBUTION MILLENNIAL-SCALE LATE PLEISTOCENE SEDIMENT TRAPS NORTH-ATLANTIC EARLY HOLOCENE Natural Sciences Naturvetenskap Steinke, Stephan Groeneveld, J Mohtadi, M Lin, L.-C. Löwemark, Ludvig Chen, M.-T. Rendle-Buehring, R Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum : Implications for the East Asian winter monsoon development |
topic_facet |
LIVING PLANKTONIC-FORAMINIFERA RADIOCARBON AGE CALIBRATION SURFACE TEMPERATURE RECORD ISOTOPIC COMPOSITION VERTICAL-DISTRIBUTION MILLENNIAL-SCALE LATE PLEISTOCENE SEDIMENT TRAPS NORTH-ATLANTIC EARLY HOLOCENE Natural Sciences Naturvetenskap |
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 (Δδ18O) and Mg/Ca-based temperatures (ΔT) 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 Δδ18O estimates are biased by changes in salinity and, thus, do not display a true upper ocean thermal gradient. The ΔT 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. authorCount :7 |
format |
Article in Journal/Newspaper |
author |
Steinke, Stephan Groeneveld, J Mohtadi, M Lin, L.-C. Löwemark, Ludvig Chen, M.-T. Rendle-Buehring, R |
author_facet |
Steinke, Stephan Groeneveld, J Mohtadi, M Lin, L.-C. Löwemark, Ludvig Chen, M.-T. Rendle-Buehring, R |
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 |
Institutionen för geologiska vetenskaper |
publishDate |
2010 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47365 https://doi.org/10.1029/2009PA001850 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_relation |
Paleoceanography, 0883-8305, 2010, 25, s. PA2219- http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47365 doi:10.1029/2009PA001850 ISI:000279314900001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2009PA001850 |
container_title |
Paleoceanography |
container_volume |
25 |
container_issue |
2 |
_version_ |
1766134853892308992 |