辽宁省极端长历时暴雨时空分布及影响系统特征

doi:10.3969/j.issn.1673-503X.2018.02.004

Abstract

Abstract: Based on hourly precipitation data observed by automatic weather stations of Liaoning province and NCEP grid reanalysis data with resolution of 1°×1° from 2005 to 2015,the characteristics of spatial and temporal distribution and influencing weather systems of extreme long duration rainstorms and the distribution of precipitati-on influenced by different systems were analyzed in this paper.The resluts show that the long duration rainstorms in Liaoning province are widely distributed and can be roughly divided into four easy-occurrence areas.The dura-tion of rain with intensity ≥ 10 mm ·h^-1 is dominated by 6-8 hours which the maximum duration is up to 14 hours and the maximum rainfall intensity is up to 91 mm ·h^-1.Moreover,the total precipitation is up to 150-200 mm for which duration is 6-7 hours and up to 250-350 mm for which duration is 8-10 hours.The number of rainstorms varies significantly from year to year.July and August is a period with high occurrence.The numbers of rainstorms are great in July,while the ranges are narrow.The number of rainstorms is less in August,while the ranges are wide.This rainstorm occurs frequently at 15:00-17:00 and 22:00-02:00.In high weather systems,it is the widest distribution and greatest intensity as well as longest duration for rainfall caused by Okhotsk Sea blocking high,and they are scattered distribution caused by zonal circulation and centralized distribution caused by Baikal Lake bloc-king high,respectively.Among them,the number of the Okhotsk Sea blocking high is the greatest.In surface weather systems,the Northwestern side of high pressure appears frequently,and it can cause rainfall with the greatest intensity.It is the wide distribution for rainfall caused by Huabei cyclone,centralized distribution caused by the Northwestern side of high pressure and typhoon and Jianghuai cyclone,and scattered distribution caused by Mongolia cyclone and Huabei cyclone.

Key words: Long duration, Extreme, Rainstorms, Influencing weather system

CLC Number:

P468.0⁺24

CHEN Chuan-lei, GUAN Zhao-yong, XIAO Guang-liang, CHENG Pan, YANG Lei, HUANG Hai-liang. Characteristics of temporal and spatial distribution and influencing weather systems of extreme long duration rainstorms in Liaoning province[J]. Journal of Meteorology and Environment, 2018, 34(2): 28-34.

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Characteristics of temporal and spatial distribution and influencing weather systems of extreme long duration rainstorms in Liaoning province

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