Preprints
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.

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Ran Zhu and Lei Chen

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2008', Anonymous Referee #1, 13 Dec 2023
    • AC1: 'Reply on RC1', Ran Zhu, 26 Dec 2023
      • RC2: 'Reply on AC1', Anonymous Referee #1, 28 Dec 2023
        • AC2: 'Reply on RC2', Ran Zhu, 29 Dec 2023
          • RC3: 'Reply on AC2', Anonymous Referee #1, 30 Dec 2023
            • AC3: 'Reply on RC3', Ran Zhu, 06 Jan 2024
              • RC4: 'Reply on AC3', Anonymous Referee #1, 08 Jan 2024
                • AC4: 'Reply on RC4', Ran Zhu, 09 Jan 2024
  • RC5: 'Comment on egusphere-2023-2008', Anonymous Referee #1, 09 Jan 2024
    • AC5: 'Reply on RC5', Ran Zhu, 10 Jan 2024
  • RC6: 'Comment on egusphere-2023-2008', Anonymous Referee #2, 08 Mar 2024
    • AC6: 'Reply on RC6', Ran Zhu, 21 Mar 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2008', Anonymous Referee #1, 13 Dec 2023
    • AC1: 'Reply on RC1', Ran Zhu, 26 Dec 2023
      • RC2: 'Reply on AC1', Anonymous Referee #1, 28 Dec 2023
        • AC2: 'Reply on RC2', Ran Zhu, 29 Dec 2023
          • RC3: 'Reply on AC2', Anonymous Referee #1, 30 Dec 2023
            • AC3: 'Reply on RC3', Ran Zhu, 06 Jan 2024
              • RC4: 'Reply on AC3', Anonymous Referee #1, 08 Jan 2024
                • AC4: 'Reply on RC4', Ran Zhu, 09 Jan 2024
  • RC5: 'Comment on egusphere-2023-2008', Anonymous Referee #1, 09 Jan 2024
    • AC5: 'Reply on RC5', Ran Zhu, 10 Jan 2024
  • RC6: 'Comment on egusphere-2023-2008', Anonymous Referee #2, 08 Mar 2024
    • AC6: 'Reply on RC6', Ran Zhu, 21 Mar 2024
Ran Zhu and Lei Chen
Ran Zhu and Lei Chen

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Short summary
There is a positive correlation between the frequency of cyclone activity and precipitation in the Meiyu period.The frequency of Jianghuai cyclone activity is high in the years with strong Meiyu rainfall. Its occurrence frequency has obvious interdecadal variation, which has a good correspondence with the periodic and interdecadal variation in precipitation in the Meiyu period.This study provides a reference for the long-term and short-term forecasting of precipitation in the Meiyu period.