Reconstructing East Asia Monsoon Variability over the Past 300,000 Years---Evidence Based on South China Sea Core Records of Planktonic Foraminifers

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Project title

Code/計畫編號

NSC87-2611-M019-012

Translated Name/計畫中文名

國際海洋古全球變遷---子計畫三：重建過去三十萬年的東亞季風變化史---南海浮游有孔蟲深海岩心記錄證據

Project Coordinator/計畫主持人

Min-Te Chen

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=356752

Year

1998

Start date/計畫起

01-08-1997

Expected Completion/計畫迄

01-07-1998

Bugetid/研究經費

1131千元

ResearchField/研究領域

地球科學
海洋科學

High-resolution studies of a planktonic foraminifer core record from the South China Sea (SCS) (31-KL and MD972148) reveal changes driven by ice-volume forcings and rapid high-frequency oscillations in the climate of the East Asian monsoon in the western Pacific marginal sea during the late Quaternary. The analyses of planktonic foraminifer faunal abundance, stable isotopes, organic carbon and carbonate data from the cores indicate striking variations in the relative abundances of the dominant taxa over the past 100,000 years since the isotope stage 5. Over short-term (< 103-104 years) variations, the SCS SST was punctuated by significant cold spikes which appear to correlate with rapid oscillation events captured from ice-core records. This pattern suggests that rapid oscillations and an instability in surface ocean conditions occurred in the SCS over the past 100,000 years. These findings suggest that the SCS surface circulation and the East Asian winter monsoon systems are mainly driven by variations in global glaciation levels and by local solar insolation changes. The association of surface ocean cooling in the SCS with global short-term climatic events suggests that rapid fluctuations occurred in the strength of the East Asian winter monsoon, which may be linked to shifts in the latitudinal position of the westerly winds and the Siberian high pressure system.

Keyword(s)

古海洋
古氣候
晚第四紀
西太平洋
季風
古全球變遷
國際海古全球變遷
浮游性有孔蟲
Paleoceanography
Paleoclimate
Late Quaternary
Western Pacific
Monsoon
PAGE
IMAGE
Planktonic foraminifer

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Reconstructing East Asia Monsoon Variability over the Past 300,000 Years---Evidence Based on South China Sea Core Records of Planktonic Foraminifers

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