Journal
JOURNAL OF MARINE SYSTEMS
Volume 85, Issue 3-4, Pages 86-95Publisher
ELSEVIER
DOI: 10.1016/j.jmarsys.2010.12.006
Keywords
Gelbstoff; Climatic changes; El Nino phenomena; Physical oceanography; South China Sea
Funding
- Chinese Academy of Sciences [KZCX2-YW-Q11-02, LYQY200807, KZCX2-YW-BR-04]
- National Natural Science Foundation of China [40876093]
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Satellite imagery of SeaWiFS from October 1997 to November 2007 is used to investigate the dominant seasonal and interannual variations of the surface light absorption due to Colored Dissolved Organic Materials (CDOM) in the South China Sea (SCS). Results show that the spatial distribution of CDOM mimics the major features of the SCS basin-scale circulation. High values of CDOM are found in upwelling regions like southeast of Vietnam in summer and northwest of Luzon in winter. At a basin scale, CDOM is high in winter when upwelling is strong, solar shortwave radiation and stratification weak, and vertical mixing intense. Opposite conditions exist in spring and summer. Interannual variability of the basin-wide CDOM is characterized by abnormal troughs during the El Nino events. A strong relationship exists between the time series of the first EOF mode (for both winter and summer) and Nino 3.4 Index. Associations of these events with climatic and hydrographic properties (i.e. wind forcing, solar shortwave radiation, Ekman pumping, vertical mixing, sea surface height and temperature) are discussed. (C) 2010 Elsevier B.V. All rights reserved.
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