500000-Year Records of Carbonate and Organic Carbon from the Southern South China Sea and Implication for East Asian Summer Monsoon Evolution
MEI Xi
ZHANG Xun-hua
ZHENG Hong-bo
LIU Rui
HUANG En-qing
Abstract：In order to understand the relation between surface productivity changes and the evolution of the East Asian summer monsoon during the Quaternary glacial cycles in southern South China Sea, high-resolution study on content and accumulation rate of calcium carbonate and organic carbon of Core MD05-2897 were done to draw the conclusions as follows: the content and accumulation rate of calcium carbonate showed significant glacial-interglacial cycle change while organic carbon mainly showed a higher frequency of the periodic changes. Both of the content and the accumulation rate of calcium carbonate and organic carbon increased in the interglacial periods and decreased in the glacial periods, which reflects the enhancement of the summer monsoon in the interglacial periods caused the strengthening of the upwelling currents and the increase of nutrients, the surface produc-tivity increased consequently. The most abundant spectrum periods of 100 ka eccentricity, 40 ka obliquity, 20 ka precession and 10 ka semi-precession indicate the characteristics of the low latitude sea areas responding to the orbital periods. The accumula-tion rate of calcium carbonate and organic carbon were in good agreement with summer insolation of low latitude in the North-ern Hemisphere related to precession which may be the main controlling factor of East Asia summer monsoon changes, and cli-mate changes related to the global ice volume is possibly the secondary controlling factor.
Keywords：soutbem South China SeaLate QuaternaryEast Asia summer monsoonorbital driveorganic carboncalcium carbonateoceangraphy.
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 22-30 )