冲绳海槽千年来陆源物质输入历史与东亚季风变迁

陈金霞; 李铁刚; 南青云

Volume 34 Issue 5

Sep. 2009

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Article Navigation > Earth Science > 2009 > 34(5): 811-818

CHEN Jin-xia, LI Tie-gang, NAN Qing-yun, 2009. Variations of Terrigenous Material Discharges in the South Okinawa Trough and Its Relation to the East Asian Summer Monsoon since the Last Millennium. Earth Science, 34(5): 811-818.

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Variations of Terrigenous Material Discharges in the South Okinawa Trough and Its Relation to the East Asian Summer Monsoon since the Last Millennium

CHEN Jin-xia^{1, 2
,},
LI Tie-gang¹,
NAN Qing-yun^{1, 2}

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Graduated School of Chinese Academy of Sciences, Beijing 100039, China

Received Date: 2009-01-21
Publish Date: 2009-09-25

Abstract

Abstract

The top part of a giant IMAGE core MD05-2908 taken from the South Okinawa Trough was investigated for the sake of understanding the climate evolution in Donghai seacoast areas since the last millennium.Sporopollen and organic carbon isotope records of bulk sediments were used as proxies to trace the climate variations and terrigenous materials discharges.Time series were demarcated by 4 AMS 14 C dating ages.Comprehensive data of sporopollen and carbon isotopic composition, together with the paleoenvironmental records show that in the South Okinawa Trough the terrigenous material discharges fluctuated obviously for the past 1 000 years.Three relatively high terrigenous material discharge periods, corresponding to 1 100-1 040 a BP, 960-880 a BP and 800-480 a BP respectively and two quite low terrigenous material discharge periods, namely, 1 040-960 a BP and 480-230 a BP, can be identified from our records.In comparison with the stalagmite δ 13 C records (which were used to trace the East Asian Summer Monsoon) from Buddha Cave, Shaanxi Province, we found that the variations of terrigenous material discharges might be related closely to variations of the East Asian Summer Monsoon (EASM).Weaker EASM resulted in a convergence rain belt and longer residence time in the South China regions, which increased the efficiency of weathering and denudation of the source area.Moreover, increased rainfall enhanced the land runoff and as a result more terrigenous materials were transported to the South Okinawa Trough.
- sporopollen,
- organic carbon isotope,
- terrigenous material discharge,
- rainfall,
- monsoon

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