| Southern Meridional Atmospheric Circulation Associated with IOD |
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| 作者姓名： | LIU Na CHEN Hongxia |
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| 作者单位： | [1]College of Physical ＆ Environmental Oceanography, Ocean University of China, Qingdao 266003, P.R. China [2]Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, SOA, Qingdao 266061, P. R. China |
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| 摘 要： | Using the monthly wind and sea surface temperature （SST） data, southern meridional atmospheric circulation cells associated with the Indian Ocean Dipole Mode （IOD） events in the Indian Ocean are for the first time described and examineS. The divergent wind and pressure vertical velocity are employed for the identification of atmospheric circulation cells. During the four different phases of the positive IOD events, the anomalous meridional Hadley circulation over the western Indian Ocean shows that the air rises in the tropics, flows poleward in the upper troposphere, sinks in the subtropics, and returns back to the tropics in the lower troposphere. The anomalous Hadley circulation over the eastern Indian Ocean is opposite to that over the western Indian Ocean. During positive IOD events, the meridional Hadley circulation over the eastern Indian Ocean is weakened while it is strengthened over the western Indian Ocean. Correlation analysis between the IOD index and the indices of the Hadley cells also proves that, the atmospheric circulation patterns are evident in every IOD event over the period of record.
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| 关 键 词： | 印度洋 IOD 表面温度 大气循环 |
| 收稿时间： | 2006-01-06 |
| 修稿时间： | 2006-02-27 |
Southern meridional atmospheric circulation associated with IOD |
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| LIU Na CHEN Hongxia.Southern Meridional Atmospheric Circulation Associated with IOD[J].Journal of Ocean University of China,2006,5(2):99-105. |
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| Authors: | Liu Na Chen Hongxia |
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| Affiliation: | 1. College of Physical & Environmental Oceanography, Ocean University of China, Qingdao 266003, P.R. China;Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, SOA, Qingdao 266061, P. R. China
2. Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, SOA, Qingdao 266061, P. R. China |
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| Abstract: | Using the monthly wind and sea surface temperature (SST) data, southern meridional atmospheric circulation cells associated with the Indian Ocean Dipole Mode (IOD) events in the Indian Ocean are for the first time described and examined. The divergent wind and pressure vertical velocity are employed for the identification of atmospheric circulation cells. During the four different phases of the positive IOD events, the anomalous meridional Hadley circulation over the western Indian Ocean shows that the air rises in the tropics, flows poleward in the upper troposphere, sinks in the subtrop-ics, and returns back to the tropics in the lower troposphere. The anomalous Hadley circulation over the eastern Indian O-cean is opposite to that over the western Indian Ocean. During positive IOD events, the meridional Hadley circulation over the eastern Indian Ocean is weakened while it is strengthened over the western Indian Ocean. Correlation analysis between the IOD index and the indices of the Hadley cells also proves that, the atmospheric circulation patterns are evident in every IOD event over the period of record. |
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| Keywords: | Indian Ocean Dipole Mode events Hadley circulation southern mid-latitudes |
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