Late Quaternary coccolith records in the South China Sea and east Asian monsoon dynamics

Author(s): Liu Chuanlian; Su Xiang; Beaufort, Luc
Author Affiliation(s): Primary:
Tongji University, Laboratory of Marine Geology, Shanghai, China
Aix Marseille Université, France
Volume Title: 34th international geological congress; abstracts
Source: International Geological Congress [International Geological Congress, Abstracts = Congrès Géologique International, Résumés, Vol.34, p.1417; 34th international geological congress, Brisbane, Queensl., Australia, Aug. 5-10, 2012. Publisher:], [location varies], International CODEN: IGABBY
Note: In English
Summary: Coccolithophorid assemblages over the past 260 ka were analyzed in three IMAGES cores (MD05-2901, MD05-2904 and MD05-2897) from the western, northern and southern South China Sea (SCS). The results revealed changes in the predominant coccolith species with a resolution averaging 0.2 kyr. The upper ocean structure fluctuations were reconstructed using the abundance of the coccolithophore Florisphaera profunda. The nutricline in the SCS showed relatively strong temporal and spatial variability. On the glacial-interglacial scale, the variations in nutricline depth show different patterns in different area. In the northern SCS, the nutricline was deep during glacial periods and shallow during interglacials, while it was similar with the southern SCS. In the western SCS, the glacial-interglacial variations were not significant. Spectral analyses of the relative abundance of F. profunda show significant precession and obliquity cycles at the three sites. The coccolith records of the three cores were compared with ODP Site 1143 in the southern SCS and MD97-2141 in the Sulu Sea to discuss the possible causes of the variations in coccolith assemblages and upper ocean structure. We suggested that the East Asian Winter Monsoon dominates the nutricline variations in the northern and southern SCS. However, the western upwelling area might be controlled by the both of summer and winter monsoon.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Asia; Assemblages; Cenozoic; Coccolithophoraceae; Cycles; Eastern Asia; Florisphaera profunda; Glacial environment; Interglacial environment; Leg 184; Microfossils; Monsoons; North Pacific; Northwest Pacific; ODP Site 1143; Obliquity of the ecliptic; Ocean Drilling Program; Pacific Ocean; Plantae; Precession; Quaternary; South China Sea; Southern South China Sea; Sulu Sea; Upper Quaternary; Upwelling; Variations; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2014083311
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