Intraseasonal oscillation in the tropical Indian Ocean
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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.
Key wordsintraseasonal oscillation tyopical Indian ocean atmospheric ISO oceanic ISO
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- Chen Longxun, and Xie An, 1988: Westward propagating low-frequency oscillation and its teleconnection in the Eastern Hemisphere.Acta Meteorologica Sinica,2, 300–312.Google Scholar
- Hu Ruijin, and Liu Qingyu, 2002: Annual and intraseasonal variations in sea surface height over the tropical Pacific.Oceanologia et Limnologia Sinica,33, 303–313.Google Scholar
- Li Chongyin, 1991:Low-Frequency Oscillation in the Atmosphere. China Meteorological Press, Beijing, 286pp. (in Chinese)Google Scholar
- Li Chongyin, 2004: Some new progresses in studies on the atmospheric intraseasonal oscillation.Progress in Natural Science,14, 734–741.Google Scholar
- Li Wei, and Yu Yongqiang, 2001: Intraseasonal oscillation in a coupled general circulation model.Chinese J. Atmos. Sci.,25, 118–132. (in Chinese)Google Scholar
- Liu Qingyu, and Wang Qi, 1999: Spatial distribution of the sea surface height intraseasonal oscillation in the tropical Pacific.Journal of Ocean University of Qingdao,29, 549–555. (in Chinese)Google Scholar
- Long Zhenxia, and Li Chongyin, 2002: Interannual variations of tropical atmospheric 30–60 day low-frequency oscillation and ENSO cycle.Chinese J. Atmos. Sci.,26, 51–62.Google Scholar
- Murakami, T., T Nakazawa, and J. He, 1984: On the 40–50 day oscillations during the 1979 Northern Hemisphere summer, part 1: Phase propagation.J. Meteor. Soc. Japan,62, 440–468.Google Scholar