| Long-term variabilities of thermodynamic structure of the East China Sea Cold Eddy in summer |
| |
| 作者姓名： | 陈永利 胡敦欣 王凡 |
| |
| 作者单位： | InstituteofOceanology,ChineseAcademyofSciences,Qingdao266071,China |
| |
| 基金项目： | ContributionNo.4610fromtheInstituteofOceanology,ChineseAcademyofSciences,Qingdao,China
SupportedbytheNationalBasicResearchProgramofChina(No.G1999043803). |
| |
| 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) analyseswere applied to this study. The results show that: l) 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 E1 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 influence of the ocean circulation takes the second in. The ECSCE was usually stronger in E1 Nifio 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.
|
| 关 键 词： | 海洋调查 温度数据 热力学 长期变化 东海 |
| 收稿时间： | 29 April 2004 |
| 修稿时间： | 27 May 2004 |
Long-term variabilities of thermodynamic structure of the East China Sea Cold Eddy in summer |
| |
| Chen?Yongli,Hu?Dunxin,Wang?Fan.Long-term variabilities of thermodynamic structure of the East China Sea Cold Eddy in summer[J].Chinese Journal of Oceanology and Limnology,2004,22(3):224-230. |
| |
| Authors: | Chen Yongli Hu Dunxin Wang Fan |
| |
| Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China |
| |
| Abstract: | 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 influence 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. |
| |
| Keywords: | ECSCE interannual and interdecadal YSWC atmospheric circulation |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
|
