1951—2017年热带气旋对湖南降水的影响及环流异常特征分析

doi:10.3969/j.issn.1673-503X.2020.02.006

Abstract

Abstract:

Understanding on the precipitation patterns influenced by tropical cyclones in Hu'nan province can provide technical support for precipitation forecast in relation to tropical cyclones in this region.Using tropical cyclone data in recent 67 years, we statistically analyzed the impact of tropical cyclones on precipitation in Hu'nan province and the characteristics of circulation anomalies.The results indicate that precipitation in relation to tropical cyclones in Hu'nan province mainly occurs from July to September.Tropical cyclones landing in coastal areas of Guangdong and Fujian provinces have the most frequent and severest effects on precipitation in Hu'nan province, and those landing in Zhejiang and Fujian provinces contribute to the widest precipitation area in Hu'nan province.These precipitation events mainly concentrate in the southeast Hu'nan province, and the heavy precipitation events have exhibited an increase in area and intensity in the past 67 years.Atmospheric circulation in relation to tropical cyclones landing in coastal regions of Guangdong and Fujian provinces is characterized by a strong South Asia High, with its location more east- and northwards, and thus a strong West Pacific Subtropical High, with its location more west- and northwards.The two high-pressure systems contribute to the convergence of southeasterly flows on the southern side of the West Pacific Subtropical High and southwesterly winds over the South China Sea and the eastern Philippine Ocean, and thus the formation of a monsoon trough.Finally, southeasterly flow over southern and eastern China favors the landing of tropical cyclones and then precipitation in these regions.Tropical cyclones landing in Fujian province, in comparison with those landing in Guangdong province, are usually accompanied with South Asia High and the West Pacific Subtropical High located further northward and the monsoon trough more eastward, which can result in a cyclonic circulation and substantial precipitation in most regions in Hu'nan province.However, tropical cyclones landing in Guangdong province were mostly controlled by a cyclonic circulation and substantial precipitation in the southeastern region of Hu'nan province.

Key words: Tropical cyclone, Circulation anomalies, Substantial precipitation

CLC Number:

P458.1⁺24

Yu-fang LIAO, Jian-ming ZHANG, Ling-yao GUO. Impact of tropical cyclones on precipitation and characteristics of circulation anomalies in Hu'nan province during 1951-2017[J]. Journal of Meteorology and Environment, 2020, 36(2): 41-48.

Figures/Tables 11

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Impact of tropical cyclones on precipitation and characteristics of circulation anomalies in Hu'nan province during 1951-2017

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