Seasonal-to-interannual variability of chlorophyll in central western South China Sea extracted from SeaWiFS |
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| Authors: | Fuwen Qiu Wendong Fang Guohong Fang |
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| Institution: | QIU Fuwen 1,3,FANG Wendong 1,FANG Guohong 1,2 1 Key Laboratory of Tropical Marine Environmental Dynamics,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510031,China 2 First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China 3Graduate University of Chinese Academy of Sciences,Beijing 100039,China |
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| Abstract: | Using 10-year (January 1998–October 2007) dataset of Sea-viewing Wide Field-of-view Sensor (SeaWiFS), we extracted the dominant
spatial patterns and temporal variations of the chlorophyll distribution in the central western South China Sea (SCS) through
Empirical Orthogonal Function (EOF) analysis. The results show that the first EOF mode is characterized by a high chlorophyll
concentration zone along the Vietnam coast. We found two peaks in summer (July–August) and in winter (December), respectively,
in normal years. The second EOF mode is characterized by a jet-shaped tongue of high chlorophyll concentration extending seaward
to the northeast in summer (July–August). To investigate the interannual variability of the chlorophyll concentration, we
extracted the first non-seasonal (annual cycle removed) EOF mode, which shows high spatial variability off the southeast Vietnam
coast. Both spatial pattern and time coefficients correspond well with those of sea surface temperature mode, and are closely
correlated to ENSO events, with a lag of 7 months. |
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| Keywords: | chlorophyll variability ENSO South China Sea (SCS) |
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