| Intraseasonal Oscillation in the Tropical Indian Ocean |
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| 作者姓名： | LI Chongyin HU Ruijin YANG Hui |
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| 作者单位： | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG)，Institute of Atmospheric Physics，Chinese Academy of Sciences，Physical Oceanography Laboratory & Ocean-Atmosphere Interaction and Climate Laboratory，Ocean University of China，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG)，Institute of Atmospheric Physics，Chinese Academy of Sciences Beijing 100029，Institute of Meteorology，PLA University of Science and Technology，Nanjing 211101，Qingdao 266003，Beijing 100029 |
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| 摘 要： | 1. Introduction The intraseasonal oscillation (ISO or Madden- Julian Oscillation, MJO) in the tropical atmosphere has been studied extensively, including its existence, structure, evolution and propagation (Madden and Ju- lian, 1971; Murakami, et al., 198…
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| 关 键 词： | 印度洋 热带地区 季节性 海洋气象 |
| 收稿时间： | 2005-01-05 |
| 修稿时间： | 2005-05-11 |
Intraseasonal oscillation in the tropical Indian Ocean |
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| LI Chongyin,HU Ruijin,YANG Hui.Intraseasonal Oscillation in the Tropical Indian Ocean[J].Advances in Atmospheric Sciences,2005,22(5):617-624. |
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| Authors: | Li Chongyin Hu Ruijin Yang Hui |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics LASG,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Physical Oceanography Laboratory & Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao 266003,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics LASG,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The features of the intraseasonal oscillation (ISO) of the tropical Indian Ocean are studied using several sources of observational data. It is shown that there are intraseasonal oscillations in the tropical Indian Ocean, but their periods vary with latitude: the major period is about 20-30 days in the equatorial region, about 30-50 days at 10°N/10°S latitude and 60-90 days at 20°N/20°S latitude. The intensity of the ISO increases with latitude but the speed of the westward propagation of the ISO decreases with latitude. The intensity and propagation speed of the ISO have clear interannual variation features. The atmospheric intraseasonal oscillation over the tropical Indian Ocean is also analyzed and compared with the oceanic intraseasonal oscillation. It is shown that the major period is in the range 30-60 days and the intensity and period of the atmospheric ISO decrease with latitude slightly. The zonal propagation of the atmospheric ISO also has some differences with the oceanic ISO. It is necessary to study the relationship between the atmospheric ISO and oceanic ISO in the tropical Indian Ocean deeply. |
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| Keywords: | intraseasonal oscillation tyopical Indian ocean atmospheric ISO oceanic ISO |
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