"0907"長江下游梅雨鋒暴雨的數(shù)值模擬和診斷分析

doi:10.3969/2012jms.0016

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"0907"長江下游梅雨鋒暴雨的數(shù)值模擬和診斷分析
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                        10.3969/2012jms.0016
                    
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基金項目:國家科技支撐計劃課題(2007BAC29B06)

Numerical simulation and diagnostic analysis of Meiyu front heavy rain over the lower Yangtze River in July of 2009

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利用常規(guī)觀測資料、衛(wèi)星T_BB資料以及客觀再分析資料,對2009年7月6—7日(簡稱"0907")的長江下游梅雨鋒暴雨過程進行了數(shù)值模擬和天氣分析,重點研究了中尺度系統(tǒng)的發(fā)生發(fā)展機制。結(jié)果表明:7月6—7日對流層低層,長江下游北側(cè)存在的一次天氣尺度低壓,其發(fā)展和東移,促使鋒生加強,低空急流發(fā)生。WRF中尺度模式數(shù)值模擬結(jié)果顯示,在次天氣尺度低壓的南側(cè)不斷形成β中尺度和γ中尺度對流系統(tǒng)。對其中一個β中尺度對流系統(tǒng)的分析研究表明:低空中尺度急流和中尺度輻合首先發(fā)生。之后中尺度輻散迅速加強。高層強輻散、低空中尺度急流核和中尺度低渦的相互耦合作用使系統(tǒng)不斷發(fā)展并東移。高層相對干冷空氣的侵入促使系統(tǒng)衰減消亡。

Abstract:

Based on routine, satellite and objective reanalysis data, a Meiyu front heavy rain occurred over the lower Yangtze River from 6 to 7 July 2009 was simulated and analyzed. The occurrence and development mechanism were emphasized. It was found that a sub-synoptic-scale vortex was on the north side of the lower Yangtze River at low level of troposphere. Its development and eastward movement intensified front and caused the occurrence of low-level jet at lower level. The simulation result provided by WRF meso-scale numerical model shows that several meso-β-scale systems and meso-γ-scale systems continued to form on the south side of sub-synoptic-scale vortex. This paper analyzed one of several meso-β-scale systems. It shows that meso-scale low-level jet and meso-scale convergence first occurred. And then meso-scale convergence enhanced rapidly. The coupling of intense divergence at upper levels, meso-scale jet at lower levels and meso-scale vortex let the system develop and eastward move continuously. The relatively dry and cold air in the upper troposphere entered the system, which caused the system to be weakened.

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趙嫻婷,苗春生,于波."0907"長江下游梅雨鋒暴雨的數(shù)值模擬和診斷分析.氣象科學,2012,32(2):194-201 ZHAO Xianting, MIAO Chunsheng, YU Bo. Numerical simulation and diagnostic analysis of Meiyu front heavy rain over the lower Yangtze River in July of 2009. Journal of the Meteorological Sciences,2012,32(2):194-201

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收稿日期:2010-11-17
最后修改日期:2011-01-27
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在線發(fā)布日期: 2012-05-03
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