Interdecadal variation of tropical cyclone activity in association with summer monsoon, sea surface temperature over the western North Pacific |
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Authors: | Chen GuangHua |
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Institution: | (1) Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100190, China |
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Abstract: | Based on geographic division over the western North Pacific (WNP), the interdecadal relationships between summer monsoon,
sea surface temperature (SST) and tropical cyclones activity (including number, track and intensity) are examined. In the
past several decades, the western Pacific subtropical high (WPSH) and tropical westerlies contribute to the interdecadal variation
of TC number in the northwest and southeast of WNP respectively. The increased TC occurrence density to the east of Philippines
related to TC track appears during the 1990s, in terms of both steer flow induced by WPSH and genesis location. From the interdecadal
viewpoint, the tendency of TC intensity, measured by averaged accumulated cyclone energy, does well agree with that of SST,
implying that SST plays an important role in TC intensity.
Supported by Special Scientific Research Project for Public Interest (Grant No. GYHY200806009) and National Basic Research
Program of China (Grant No. 2009CB421505) |
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Keywords: | interdecadal variation tropical cyclone activity summer monsoon sea surface temperature western North Pacific |
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