![Development of the East Asian monsoon and Northern Hemisphere glaciation: oxygen isotope records from the South China Sea [An article from: Quaternary Science Reviews]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR0IEO.jpg)
Development of the East Asian monsoon and Northern Hemisphere glaciation: oxygen isotope records from the South China Sea [An article from: Quaternary Science Reviews]
Book Details
Author(s)J. Tian, P. Wang, X. Cheng
PublisherElsevier
ISBN / ASINB000RR0IEO
ISBN-13978B000RR0IE2
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Quaternary Science Reviews, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Oxygen isotope records of the surface-dwelling foraminifer Globigerinoides ruber from ODP Site 1143 in the southern South China Sea (SCS) are presented for the last 5Ma. The G. ruber @d^1^8O of Site 1143 for the past 500ka is lighter by 0.5-1.0%% in interglacial, and by 0.1-0.5%% in glacial periods, than the Site 806B record from the Ontong Java Plateau. We infer the light glacial/interglacial G. ruber @d^1^8O at Site 1143, compared with the open western Pacific, to have been caused by stronger monsoon-induced precipitation over the SCS. While glacial/interglacial planktonic @d^1^8O values remained stable over the 3.3-2.5Ma period, the benthic Cibicidoides wuellerstorfi @d^1^8O gradually became positive, leading to an obvious slope in their @d^1^8O difference (@D@d^1^8O"b"-"p). The stable glacial/interglacial G. ruber @d^1^8O over this period is probably caused by the decrease of sea surface salinity, which counteracted the effects of global ice volume and sea surface temperature on the G. ruber @d^1^8O. We interpret that the intensification of the East Asian monsoon winds coupled with the northern hemisphere glaciation 3.3-2.5Ma ago likely brought frequent and strong precipitation over the SCS and/or caused large-scale intrusions of Borneo alongshore low-salinity waters to the southern SCS, which greatly freshened the SCS and decreased its salinity. After 2.5Ma, especially in the Quaternary period, the planktonic and benthic @d^1^8O show similar variations over glacial/interglacial cycles in responding to the waxing and waning of the northern hemisphere continental ice sheet, and their relatively stable @d^1^8O difference (@D@d^1^8O"b"-"p) indicates a period of steady fluctuations of the East Asian monsoon winds. The more positive values of @D@d^1^8O"b"-"p probably suggest stronger East Asian winter monsoon during Quaternary glacials whereas the more negative values of @D@d^1^8O"b"-"p may imply stronger East Asian summer monsoon during Quaternary interglacials.
Description:
Oxygen isotope records of the surface-dwelling foraminifer Globigerinoides ruber from ODP Site 1143 in the southern South China Sea (SCS) are presented for the last 5Ma. The G. ruber @d^1^8O of Site 1143 for the past 500ka is lighter by 0.5-1.0%% in interglacial, and by 0.1-0.5%% in glacial periods, than the Site 806B record from the Ontong Java Plateau. We infer the light glacial/interglacial G. ruber @d^1^8O at Site 1143, compared with the open western Pacific, to have been caused by stronger monsoon-induced precipitation over the SCS. While glacial/interglacial planktonic @d^1^8O values remained stable over the 3.3-2.5Ma period, the benthic Cibicidoides wuellerstorfi @d^1^8O gradually became positive, leading to an obvious slope in their @d^1^8O difference (@D@d^1^8O"b"-"p). The stable glacial/interglacial G. ruber @d^1^8O over this period is probably caused by the decrease of sea surface salinity, which counteracted the effects of global ice volume and sea surface temperature on the G. ruber @d^1^8O. We interpret that the intensification of the East Asian monsoon winds coupled with the northern hemisphere glaciation 3.3-2.5Ma ago likely brought frequent and strong precipitation over the SCS and/or caused large-scale intrusions of Borneo alongshore low-salinity waters to the southern SCS, which greatly freshened the SCS and decreased its salinity. After 2.5Ma, especially in the Quaternary period, the planktonic and benthic @d^1^8O show similar variations over glacial/interglacial cycles in responding to the waxing and waning of the northern hemisphere continental ice sheet, and their relatively stable @d^1^8O difference (@D@d^1^8O"b"-"p) indicates a period of steady fluctuations of the East Asian monsoon winds. The more positive values of @D@d^1^8O"b"-"p probably suggest stronger East Asian winter monsoon during Quaternary glacials whereas the more negative values of @D@d^1^8O"b"-"p may imply stronger East Asian summer monsoon during Quaternary interglacials.
