| Relationship between the Asian-Pacific oscillation and the tropical cyclone frequency in the western North Pacific |
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| 摘 要： | The relationship between the Asian-Pacific oscillation (APO) and the tropical cyclone frequency over the western North Pacific (WNP) in summer is preliminarily investigated through an analysis of ob- served data. The result has shown clearly that APO is significantly and positively correlated to the tropical cyclone frequency in the WNP. If APO is above (below) the normal in summer, more (less) tropical cyclones will tend to appear in the WNP. The present study also addresses the large-scale at- mospheric general circulation changes underlying the linkage between APO and the WNP tropical cy- clone frequency. It follows that a positive phase of summer APO is concurrent with weakened as well as northward and eastward located western Pacific subtropical high (WPSH), low-level convergence and high-level divergence, and reduced vertical zonal wind shear in the WNP, providing favorable envi- ronment for the tropical cyclone genesis, and thus more tropical cyclones will come into being, and vice versa.
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| 收稿时间： | 1 September 2007 |
| 修稿时间： | 26 October 2007 |
Relationship between the Asian-Pacific oscillation and the tropical cyclone frequency in the western North Pacific |
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| Authors: | Zhou BoTao Cui Xuan Zhao Ping |
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| Institution: | (1) Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing, 100081, China;(2) National Meteorological Center, China Meteorological Administration, Beijing, 100081, China;(3) Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, 100081, China |
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| Abstract: | The relationship between the Asian-Pacific oscillation (APO) and the tropical cyclone frequency over the western North Pacific (WNP) in summer is preliminarily investigated through an analysis of ob- served data. The result has shown clearly that APO is significantly and positively correlated to the tropical cyclone frequency in the WNP. If APO is above (below) the normal in summer, more (less) tropical cyclones will tend to appear in the WNP. The present study also addresses the large-scale at- mospheric general circulation changes underlying the linkage between APO and the WNP tropical cy- clone frequency. It follows that a positive phase of summer APO is concurrent with weakened as well as northward and eastward located western Pacific subtropical high (WPSH), low-level convergence and high-level divergence, and reduced vertical zonal wind shear in the WNP, providing favorable envi- ronment for the tropical cyclone genesis, and thus more tropical cyclones will come into being, and vice versa. |
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| Keywords: | Asian-Pacific oscillation western North Pacific tropical cyclone atmospheric circulation |
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