Interannual changes of the upwelling off the southern Vietnam in the South China Sea in summers of 1990-2013

Yi-Chia Hsin, Research Center for Environmental Changes Academia Sinica, Taipei, Taiwan and Mai Han Thi Ngo, University of Science, Department of Oceanology, Meteorology and Hydrology, Ho Chi Minh City, Vietnam
Abstract:
The summertime upwelling off the southern Vietnamese coast is one the most important features in the South China Sea. It remarkably contributes to the abundance of fishery resources and has a great influence on heat distribution. In combined use of multiple satellite data, the interannual variation of the upwelling intensity in summers of 1990-2013 and some concerning factors are investigated. Three upwelling areas are identified in this study. One is offshore region and two are along the Vietnamese coast. An upwelling index derived from sea surface temperature is introduced to quantitatively explore the intensity change of this summertime upwelling phenomenon.
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