Seasonal cycle of topography in the Bohai Sea and Yellow Sea and its relationships with atmospheric forcing and oceanic

Seasonal cycle is the most significant signals of topography and circulation in the Bohai Sea (BS)and Yellow Sea (YS) forced by prevailing monsoon and is still poorly understood due to lack of data in their interiors. In the present study, seasonal cycles of topography in the BS and YS and its relationship with atmospheric forcing and oceanic adjustment were examined and discussed using TOPEX/Poseidon and ERS-1/2 Sea Level Anomalies (SLA) data. Analyses revealed complicated seasonal cycles of topography composed mainly of2 REOF modes, the winter-summer mode (WIM) and spring-autumn mode (SAM). The WIM with action center in the BS displayed peak and southward pressure gradient in July, and valley and northward pressure gradient in January, which is obviously the direct response to monsoon with about 1-month response time. The SAM with action center in the western south YS displayed peak and northward pressure gradient in October and valley and southward pressure gradient in April. After the mature period of monsoon, the action center in the BS became weakened while that in the western south YS became strengthened because of regional convergence or divergence induced by seasonal variations of the Taiwan Warm Current and Yellow Sea Coastal Current. The direct response of topography to monsoon resulted in the WIM, while oceanic adjustment of topography played an important role in the forming of the SAM.

作 者： 王凡 林鹏飞 陈永利 唐晓晖   作者单位： 王凡,陈永利(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China)

林鹏飞,唐晓晖(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;The Graduate School of the Chinese Academy of Sciences, Beijing 100039, China) 

刊 名： 中国海洋湖沼学报(英文版)  ISTIC SCI 英文刊名： CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY  年，卷(期)： 2004 22(3)  分类号：   关键词： topography   seasonal cycle   sea level anomalies   the Bohai Sea   the Yellow Sea   response   adjustment  

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