Abstract
A Jianghuai cyclone is an extratropical cyclone, which influences the middle and lower reaches of the Yangtze River and Huai River basins in China. According to the definition of Jianghuai cyclones, statistics of their climate characteristics from 1979 to 2010 are obtained by an objective detection and tracking algorithm using ERA-Interim reanalysis data. The results show that the frequency of Jianghuai cyclones has a strong year-to-year variability but no obvious trend. Jianghuai cyclones are most frequent in May but fewest in December. As the cold air is active in spring, which interacts with the warm air from the southwest of the subtropical high at the Yangtze-Huai River region, it makes Jianghuai cyclones occur more frequently in this season. The main origins of Jianghuai cyclones are located in the Poyang Lake region, Dongting Lake region, and Dabie Mountain area. The maximum deepening rate of 0–2 hPa/6 h is featured in 66.4% of Jianghuai cyclones. Over 40% of Jianghuai cyclones have a mean deepening rate of 0–1 hPa/6 h. The lifetime of Jianghuai cyclones is short, mainly lasting for one to two days. In addition, background characteristics are compared between the formation, climax, and decaying periods of Jianghuai cyclones.
Highlights
Cyclones and their associated weather are always the focus of public and scientific attention [1,2].A Jianghuai cyclone is an extratropical cyclone, which affects the middle and lower reaches of the Yangtze River and Huai River basins in China
1961the tracking algorithm are reliable, cyclone numbers and genesis times are compared with observation to 1980 [20]
We find that the maximum deepening rate of Jianghuai cyclones lies most often between 0 and 2 hPa/6h (66.38%)
Summary
Cyclones and their associated weather are always the focus of public and scientific attention [1,2]. Xu and Jiao [3] analyzed two cases of Jianghuai cyclones and described their distributions of pressure, divergence, vorticity, and velocity. Zhang and Wang [4] used 13 cases of Jianghuai cyclones to perform a synthesis analysis. Studied the structures of two cases of summer Jianghuai cyclones. An automatic detection and tracking algorithm [8,9,10,11,12,13] provide the possibility to track cyclones in an efficient and objective way. We here apply the detection and tracking method to Jianghuai cyclones to record their tracks, core pressures, lifetime, and other related fields.
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