&nbsp;The relationship between environmental factors and tropical cyclone activity in the western North Pacific <br><br>

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Journal of Nanjing University(Natural Sciences) ›› 2010, Vol. 46 ›› Issue (3) : 254-260.

The relationship between environmental factors and tropical cyclone activity in the western North Pacific

Du Yu Gang, Chu Hui Yun

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Abstract

In order to better understand the relationship between environmental factors and tropical cyclone ( TC) activity in the western North Pacific( WNP) . The sea surface temperature( SST) , 850 hPa temperature, specific
humidity index (between 925~ 500 hPa) and vertical wind shear ( between 200~ 850 hPa) are chosen over the WNPduring a 32yr period from 1970- 2001. All the indices either represent oceanic warming ( such as SST ), or only
reflect atmospheric conditions. The results show that 850 hPa temperature and specific humidity index both positively contribute to the development of T C activity. Particularly, the SST and vertical wind shear inhibit TC
activity. According to the results, two indices are defined. One is the temperature difference between 850 hPatemperature and SST which represents atmosphere ocean coupling influence. The other reflects static stability
between 850 hPa and 1 000 hPa of atmosphere. After analyzing the indices, it is found that, the temperature difference considering the coupling degree of air sea is of significant impact on TC activity.

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Du Yu Gang, Chu Hui Yun . The relationship between environmental factors and tropical cyclone activity in the western North Pacific

[J]. Journal of Nanjing University(Natural Sciences), 2010, 46(3): 254-260

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