Long-term variabilities of thermodynamic structure of the East China Sea Cold Eddy in summer

Long-term variabilities of thermodynamic structure

of the East China Sea Cold Eddy in summer

陈永利;胡敦欣;王凡

【期刊名称】《中国海洋湖沼学报（英文版）》 【年(卷),期】2004(022)003

【摘要】Based on more than 30 years observed sectional temperature data since the 1960s, and compared with multi-year wind and Changjiang (Yangtze) River discharge data, spatial-temporal variations of the East China Sea Cold Eddy (ECSCE) in summer was analyzed in relationship to ocean circulation and local atmospheric circulation. Empirical Orthogonal Function (EOF) and Singular Value Decomposition (SVD) analyses were applied to this study. The results show that: 1) The ECSCE in summer possesses significant interannual variabilities, which are directly associated with oceanic and atmospheric circulation anomaly. Main fluctuations demonstrate their falling in basically with El Nino events (interannual) and interdecadal variability. 2) The ECSCE in summer is closely related to the variation of the Yellow Sea Warm Current (YSWC) and the Changjiang River discharge. The stronger the YSWC, the more intensive the ECSCE with its center shifting westward,and vice versa. However, a negative correlation between the Changjiang River discharge and the ECSCE strength is shown. The ECSCE was strengthened after the abrupt global climate change

affected by the interdecadal variation of the YSWC. 3) SVD analysis suggested a high correlation between the variation of the ECSCE in summer and the anomalous cyclonic atmospheric circulation over the ECS. Intensification of the cyclonic wind strengthens the ECSCE, and vice versa. 4) The cyclonic atmospheric circulation has dominant influence on the interannual variation of the ECSCE, and the infltience of the ocean circulation takes the second in. The ECSCE was usually stronger in El Nino years affected by strong cyclonic circulation in the atmosphere. The variation in strength of the ECSCE resulted from the joint effect of both oceanic and atmospheric circulation. 【总页数】7页(224-230)

【关键词】ECSCE;interannual and interdecadal;YSWC;atmospheric circulation

【作者】陈永利;胡敦欣;王凡

【作者单位】Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 【正文语种】中文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_chinese-

journal-oceanic-limnology-english-edition_thesis/0201252508604.html 【相关文献】

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