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https://doi.org/10.5194/egusphere-2023-2008
https://doi.org/10.5194/egusphere-2023-2008
27 Oct 2023
 | 27 Oct 2023

Climatic characteristics of the Jianghuai cyclone and its linkage with precipitation during the Meiyu period from 1961 to 2020

Ran Zhu and Lei Chen

Abstract. This study examines the climatic characteristics of 202 Jianghuai cyclones and their linkage with precipitation during the Meiyu period from 1961 to 2020. The results show that cyclones mainly originate from eastern Hubei Province and south-central Anhui Province. The frequency of Jianghuai cyclone occurrences shows an increasing trend in 1965–1970, 1990–2000, and after 2020. A decreasing trend is observed for 1970–1990 and 2000–2010. There is a positive correlation coefficient of 0.769 between the frequency of cyclone activity and precipitation in the Meiyu period. The percentage of precipitation affected by cyclone activities can reach up to 47 %. The anomalous increase in precipitation caused by cyclones above 27° N can reach a maximum of 7 mm/day. In contrast, precipitation is decreased in southern China because of the strengthening positive geopotential height in the Western Pacific subtropical high (WPSH). Precursor negative geopotential height anomalies for these cyclones emerge over the Mongolian region. The abnormal signal of the negative geopotential height can be traced to day -4 at the 500 hPa level. The WPSH and southwest jet are the dominant factors causing abnormal precipitation during Jianghuai cyclones. The significant water vapor convergence anomalies in the middle and lower reaches of the Yangtze River and the southwestward water vapor transport anomalies provide sufficient water vapor for cyclone development.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Journal article(s) based on this preprint

11 Jun 2024
Climatic characteristics of the Jianghuai cyclone and its linkage with precipitation during the Meiyu period from 1961 to 2020
Ran Zhu and Lei Chen
Nat. Hazards Earth Syst. Sci., 24, 1937–1950, https://doi.org/10.5194/nhess-24-1937-2024,https://doi.org/10.5194/nhess-24-1937-2024, 2024
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There is a positive correlation between the frequency of cyclone activity and precipitation in...
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