| A dipole mode at thermocline layer in the tropical Indian Ocean |
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| 作者姓名： | Tian Jiwei Liu Huiqing Qian Weihong |
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| 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) |
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| 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.
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| 关 键 词： | Temperature anomaly dipole mode in thermocline layer tropical Indian Ocean empirical orthogonal function |
| 收稿时间： | 2002/6/17 0:00:00 |
| 修稿时间： | 2002/8/20 0:00:00 |
A dipole mode at thermocline layer in the tropical Indian Ocean |
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| Tian Jiwei,Liu Huiqing,Qian Weihong.A dipole mode at thermocline layer in the tropical Indian Ocean[J].Acta Oceanologica Sinica,2003,22(1):15-24. |
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| Authors: | Tian Jiwei Liu Huiqing and Qian Weihong |
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| Institution: | 1.Physical Oceanography Laboratory, Ocean University of China(Ocean University of Qingdao), Qingdao 266003, China2.Department of Atmospheric Sciences, Peking University, Beijing 100871, China |
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| Abstract: | Temperature data at different layers of the past 45 years were studied and we found a
diploe 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. |
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| Keywords: | Temperature anomaly dipole mode in thermocline layer tropical Indian Ocean empirical orthogonal function |
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