ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The Study on the Heavy Rainfall Induced by Tropical Cyclones Entering Jiangsu and the Influence of Cold Air
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Abstract:
Using dynamic synthesis analysis methods, a comparative analysis was conducted on the reasons for heavy rainfall induced by tropical cyclones entering Jiangsu, both with and without the influence of cold air. A meteorological model of heavy rainfall associated with tropical cyclones in Jiangsu was established, and the following conclusions were obtained: (1) Regardless of the presence of cold air influence, tropical cyclones entering Jiangsu can induce heavy rainfall. The key reasons include the evolution of tropical cyclone"s asymmetric structure, the continuous water vapor transport by low-level jet streams, and the sustained strong upward motion near the tropical cyclone. The differences primarily involve the maintenance mechanisms of dynamic lifting and the growth way of atmospheric instability. (2) When cold air is present, baroclinicity and conditional instability within the outer circulation of tropical cyclones intensify rapidly. Slantwise ascent in the baroclinic zone promotes the sustained lifting of warm-moist air and enhances convective development, with heavy rainfall primarily located on the northern to northeastern sides of tropical cyclones. When cold air is absent, continuous transport of warm-moist air by low-level and ultra-low-level jets significantly enhances the conditional instability near and around the center of tropical cyclones. The deep vertical updraft, sustained by convergence within the warm sector and further enhanced by latent heat release, favors the development of convective precipitation, with heavy rainfall primarily located on the eastern to northeastern sides of tropical cyclones.
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