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A dipole mode at thermocline layer in the tropical Indian Ocean
引用本文:Tian Jiwei,Liu Huiqing,Qian Weihong. A dipole mode at thermocline layer in the tropical Indian Ocean[J]. 海洋学报(英文版), 2003, 22(1): 15-24
作者姓名:Tian Jiwei  Liu Huiqing  Qian Weihong
作者单位:田纪伟,刘慧卿(Physical Oceanography Laboratory,Ocean University of China (Ocean University of Qingdao),Qingdao 266003,China);钱维宏(Department of Atmospheric Sciences,Peking University,Beijing 100871,China) 
摘    要:Temperature data at different layers of the past 45 years were studied and we found adiploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian O-cean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.

关 键 词:Temperature anomaly  dipole mode in thermocline layer  tropical Indian Ocean  empirical orthogonal function
收稿时间:2002-06-17
修稿时间:2002-08-20

A dipole mode at thermocline layer in the tropical Indian Ocean
Tian Jiwei,Liu Huiqing and Qian Weihong. A dipole mode at thermocline layer in the tropical Indian Ocean[J]. Acta Oceanologica Sinica, 2003, 22(1): 15-24
Authors:Tian Jiwei  Liu Huiqing  Qian Weihong
Affiliation:1.Physical Oceanography Laboratory, Ocean University of China(Ocean University of Qingdao), Qingdao 266003, China2.Department of Atmospheric Sciences, Peking University, Beijing 100871, China
Abstract:Temperature data at different layers of the past 45 years were studied and we found adiploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian O-cean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.
Keywords:Temperature anomaly   dipole mode in thermocline layer   tropical Indian Ocean   empirical orthogonal function
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