scholarly journals Clay mineralogical and geochemical proxies of the East Asian summer monsoon evolution in the South China Sea during Late Quaternary

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Quan Chen ◽  
Zhifei Liu ◽  
Catherine Kissel
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Late Quaternary ◽  
East Asian ◽  
The South China Sea ◽  
Geochemical Proxies ◽  
Asian Summer

Late Quaternary Upwelling Intensity and East Asian Monsoon Forcing in the South China Sea

2001 ◽  
Vol 55 (3) ◽  
pp. 363-370 ◽  
Author(s):  
Zhimin Jian ◽  
Baoqi Huang ◽  
Wolfgang Kuhnt ◽  
Hui-Ling Lin
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
The South China Sea ◽  
Asian Summer ◽  
Mis 5

AbstractForaminifera from two cores off eastern Vietnam and the northwestern Philippines, where modern summer and winter monsoon-driven upwelling occurs in the South China Sea, respectively, were analyzed to evaluate the changes in paleoproductivity and upper water structure over the last 220,000 yr. We observed enhanced organic carbon flux and a shoaled thermocline when upwelling intensified off eastern Vietnam during interglacial ages and off the northwestern Philippines during glacial ages. This indicates that the East Asian summer monsoon increased while the winter monsoon decreased during interglacial ages. Particularly, the upwelling reached a maximum off eastern Vietnam during late marine isotopic stage (MIS) 5 and off the northwestern Philippines during MIS 2, implying that the summer monsoon decreased gradually since MIS 5 while the winter monsoon displayed an opposite trend. The variations in upwelling proxies exhibit a distinct cyclicity with frequencies near 41,000 yr and 23,000 yr off eastern Vietnam, in contrast to a strong frequency peak near 100,000 yr off the northwestern Philippines. We suggest that the East Asian summer monsoon has been forced by changes in solar insolation associated with precession and obliquity, while ice-volume forcing is probably a primary factor in determining the strength and timing of the East Asian winter monsoon but with less important insolation forcing.

A high-resolution sediment record of East Asian summer monsoon from the northern South China Sea spanning the past 7500 years

The Holocene ◽  
2020 ◽  
Vol 30 (12) ◽  
pp. 1669-1680
Author(s):  
Chao Huang ◽  
Mingkun Li ◽  
Zhifeng Liu ◽  
Gangjian Wei ◽  
Fajin Chen ◽  
...  
Keyword(s):  
Grain Size ◽  
Solar Activity ◽  
High Resolution ◽  
South China Sea ◽  
South China ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Sediment Records ◽  
Asian Summer

High-resolution Holocene marine sediment records are limited, which hampers our understanding of paleomonsoon evolution. Continental shelf sediment records are derived mainly from terrestrial weathering products and are thus often sensitive to paleoclimate variations. In this study, the grain size and magnetic mineral composition of a well-dated sediment core (YJ Core) from the northern inner shelf of the South China Sea (SCS) were analyzed to provide a high-resolution record of the Holocene evolution of the East Asian summer monsoon (EASM). These magnetic and grain size records indicate that EASM intensity followed a general declining trend between approximately 6800 and 2000 cal yr BP. This general pattern is synchronous with other geologic archives from monsoon regions, and can be attributed to solar radiation forcing in the Northern Hemisphere. On centennial timescales, a weak EASM closely coincides with periods of weak solar activity. In addition, spectral analysis of clays reveals five prominent cycles, with periodicities of approximately 364, 202, 158, 119, and 104 years, which correspond to solar activity cycles. The similarities between the cyclicities of the Asian monsoon signal in sedimentary records and those of solar activity demonstrate that solar forcing has a relatively large influence on the centennial-scale variability of the EASM.

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