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South China Sea Warm Pool in Boreal Spring
South China Sea Warm Pool in Boreal Spring

Keywords: Warm-core eddy,Summer monsoon,Downwelling,South China Sea

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During the boreal spring of 1966, a warm-core eddy is identified in the upper South China Sea (SCS) west of the Philippines through an analysis of the U.S. Navy’s Master Oceanographic Observation Data Set. This eddy occurred before the development of the northern summer monsoon and disappeared afterward. We propose that this eddy is a result of the radiative warming during spring and the downwelling due to the anticyclonic forcing at the surface. Our hypothesis suggests an air-sea feedback scenario that may explain the development and withdrawal of the summer monsoon over the SCS. The development phase of the warm-core eddy in this hypothesis is tested by using the Princeton Ocean model. Authors are grateful to Yongfu Qian and Shihua Lu for discussion. This work was supported by the Office of Naval Research NOMP AND NAMP Programs, and by the Naval Oceanographic Office.


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