长沙城区两次极端暴雨成因对比分析

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Abstract In this paper,the conventional observation data,NCEP reanalysis data and satellite data are used to compare and analyze the two extreme rainstorm of "6.9" and "8.17" in Changsha urban area,looking for similarities and differences.The results show that the two rainstorm are mainly convective,and the maximum rainfall intensity is more than 90 mm/h.The "6.9" rainstorm occurred in the periphery of the subtropical high,and the "8.17" rainstorm occurred in the control area of the subtropical high.The water vapor sources of the two rainstorm are the same,the specific humidity is more than 16 g/kg,and the precipitation of the whole layer is more than 130 mm.The false equivalent potential temperature center of the lower layer is more than 360 K.The unstable situation is formed in the upper layer,and the energy is mainly concentrated in the lower layer.Both processes are influenced by the migration and development of beta mesoscale convective cells,and the mesoscale system moves slowly with a long impact time.Both of the two rainstorm were fine weather before the occurrence,and the ground was in a state of high temperature and high humidity.When there was cold advection,it could trigger local convective weather.The ground trough and convergence line strengthened the development of convection.

Key words： extreme rainstorm comparative analysis physical quantity field mesoscale cloud cluster

Received: 07 November 2024

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	Fang Yun
	Yin Lian
	Shen Tianyao
	Chen Ting
	Wei Wenting
	Wang Jinning

Cite this article:

Fang Yun,Yin Lian,Shen Tianyao等. Comparative analysis of the causes of two extreme rainstorms in Changsha urban area[J]. Meteorological Hydrological and Marine Instrument, 2025, 42(4): 61-65.

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http://www.qxswhy.com/EN/ OR http://www.qxswhy.com/EN/Y2025/V42/I4/61

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