南海沉积物漫反射光谱反映的220ka以来东亚夏季风变迁

刘连文; 郑洪波; 翦知湣

Volume 30 Issue 5

Sep. 2005

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Article Navigation > Earth Science > 2005 > 30(5): 543-549

LIU Lian-wen, ZHENG Hong-bo, JIAN Zhi-min, 2005. Visible Reflectance Record of South China Sea Sediments during the Past 220 ka and Its Implications for East Asian Monsoon Variation. Earth Science, 30(5): 543-549.

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Visible Reflectance Record of South China Sea Sediments during the Past 220 ka and Its Implications for East Asian Monsoon Variation

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
Institute of Surficial Geochemistry, State Key Laboratory of Mineral Deposit Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China

Received Date: 2005-07-17
Publish Date: 2005-09-25

Abstract

Abstract

The East Asian monsoon (EAM) is an integral part of the global climatic system. Comparison between marine and terrestrial records can improve our knowledge of the monsoon system and how it responds to changing global conditions. In this paper, reflectance spectroscopy analysis is used to characterize the sediments in core 17954, taken from the South China Sea and representing the past 220 ka. The results show that sediment brightness (factor 1) seems to reflect carbonate contents and its changes are similar to the benthic oxygen isotope. Sediment redness (factor 2), which is related to iron oxide content, seems to monitor paleoclimatic changes in the core. Iron oxide appears to be eroded from catchments and is transported by fluvial means into the SCS. Thus, redness increases (factor 2 decreases) at times of increased precipitation, that is, as monsoon strength increases. Our results indicate that the Monsoon Termination Ⅱ occurred at ca. 129 ka based on orbital chronology. Two abnormally strong summer events occurred at the intervals just before the last two terminations, which are confirmed by other records around the world. A time series anlaysis of the factor 2 record indicates a half-precession frequency, which may correlate with the abnormally strong summer monsoon events, suggesting that the tropical ocean had a major effect on the East Asian summer monsoon.
- visible reflectance,
- East Asian summer monsoon,
- South China Sea,
- iron oxide,
- half-precession

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