Anti-Phase Relationship Between the East Asian Winter Monsoon and Summer Monsoon During the Holocene?

The relationship between the East Asian winter monsoon (EAWM) and East Asian summer monsoon (EASM) during the Holocene is complicated and remains controversial. In this study, analysis of grain size and benthic foraminiferal oxygen isotope, as well as accelerator mass spectrometry 14C dating was per...

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Bibliographic Details
Published in:Journal of Ocean University of China 2017-04, Vol.16 (2), p.175-183
Main Authors: Ge, Qian, Xue, Zuo, Yao, Zhigang, Zang, Zhengchen, Chu, Fengyou
Format: Article
Language:English
Subjects:
Asian
China
Earth and Environmental Science
Earth Sciences
East
grain
Grain size
Holocene
isotope
Isotopes
Marine
Meteorology
monsoon
Ocean circulation
Oceanography
oxygen
Paleoclimate science
Sea
Seasonal variations
size
South
summer
Wind
winter
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Summary:The relationship between the East Asian winter monsoon (EAWM) and East Asian summer monsoon (EASM) during the Holocene is complicated and remains controversial. In this study, analysis of grain size and benthic foraminiferal oxygen isotope, as well as accelerator mass spectrometry 14C dating was performed on a sediment core retrieved from the newly revealed muddy deposit on the northern South China Sea continental shelf. The history of the EAWM and EASM were reconstructed for the last 8200 a BP.Further analysis in conjunction with previously published paleo-climate proxies revealed that the relationship between the EAWM and EASM during the Holocene is more complex than a simple and strict anti-phase one-both negative and positive correlations were identified. The EAWM and EASM are negatively correlated around 7500, 4800, 4200, 3200, and 300 a BP (cooling periods), while positively correlated around 7100, 3700, and 2100 a BP (warm periods). In particular, both the EAWM and EASM intensified during the three positive correlation periods. However, we also found that the relationship between these two sub-monsoons is anti-phase during the final phase of particularly hot periods like Holocene Optimum and Medieval warm period. The possible impact from variations of solar irradiance on the relationship between the EAWM and EASM was also discussed.
ISSN:1672-5182
1993-5021
1672-5174
DOI:10.1007/s11802-017-3098-x