Terrestrial flux in sediments from the Okinawa Trough and its response to climate changes over the past 35000 a

MENG Xian-wei; DU De-wen; LIU Yan-guang; Han Yi-bing

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MENG Xian-wei, DU De-wen, LIU Yan-guang, Han Yi-bing. Terrestrial flux in sediments from the Okinawa Trough and its response to climate changes over the past 35000 a[J]. Haiyang Xuebao, 2007, 29(5): 74-80.

Citation:

MENG Xian-wei, DU De-wen, LIU Yan-guang, Han Yi-bing. Terrestrial flux in sediments from the Okinawa Trough and its response to climate changes over the past 35000 a[J]. Haiyang Xuebao, 2007, 29(5): 74-80.

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Terrestrial flux in sediments from the Okinawa Trough and its response to climate changes over the past 35000 a

First Institute of Ocenography, State Oceanic Adminstration, Qingdao 266061, China;Kay Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute Oceanegraphy, State Oceanic Administration, Qingdao 266061, China

Received Date: 2005-09-06
Rev Recd Date: 2006-11-24

Abstract

Abstract

A terrestrial flux in sediments is potential not only to reflect the paleoceanog raphic evolution of sedimentary basin, but also to reveal the paleoclimatic changes in source regions.The sediments of Core DGKS9603 from the Okinawa Trough were quantitatively partitioned into terrestrial, volcanic and biogenitic source end members, using Q-mode factor analysis for geochemical compositional data.Combined with the density of dried sediments and sedimentation rate, the terrest rial flux in the sediments from the Okinawa Trough since the last 35 000 a has been estimated to reveal the response of terrest rial supply to climate changes.It is demonst rated that the terrestrial supply to the Okinawa Trough has mainly derived from China's Mainland terrestrial mass via the Changjiang River.On the glacial-interglacial scale, terrestrial supply to the Okinawa Trough was mainly controlled by sea level changes via changing the relative distance between the Changjiang River mouth and the Okinawa Trough.During the Last Glacial maximum and cooling events (Heinrich events), the East Asian winter monsoon would have intensified and thus provided much eolain dust to the Okinawa Trough.The Heinrich events recorded in the Okinawa Trough would be related to the intensifitation of the East Asian winter monsoon.
- terrestrial flux,
- sea-level change,
- factor analysis for compositional data

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