南亞高壓和高低空急流對2010年浙江梅汛期暴雨的影響

doi:10.3969/2012jms.0040

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南亞高壓和高低空急流對2010年浙江梅汛期暴雨的影響
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                        10.3969/2012jms.0040
                    
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The effect of south Asia high and upper and lower-level jets on Meiyu rainstorm in Zhejiang province during 2010

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利用常規(guī)氣象站資料和美國NCEP/NCAR再分析資料,分析了2010年浙江梅汛期降水特征及南亞高壓和高低空急流對梅汛期暴雨的影響。結果表明:(1)2010年浙江入、出梅偏晚,梅期明顯偏長;降水偏多,強降水集中在浙江西南部,并逐漸向南北階梯遞減;暴雨過程頻繁,降水集中,階段性明顯;(2)梅汛期間南亞高壓主體偏強,加強中南北振蕩和東西進退明顯。高壓脊線的南北振蕩與強雨帶南北擺動有一定的相關性。南亞高壓在穩(wěn)定狀態(tài)或變化時都可能產(chǎn)生暴雨,暴雨多發(fā)生于變化時,且高壓的西退與南撤同步,東進與北抬同步;(3) 梅汛期高低空急流的演變具有較好的一致性,且與暴雨時空對應較好。暴雨帶多處于高空急流的右側和低空急流軸的左側,暴雨帶隨高低空急流的位置變化而南北擺動,同時,低空急流軸到急流北緣與暴雨帶有不同程度重疊。高低空急流強度與降雨強度有較密切的關系,高低空急流的水平距離對高低空急流耦合作用有重要影響,進而影響垂直運動發(fā)展和降水強度。因此,高低空急流的配置對梅汛期暴雨落區(qū)和強度預報有很好的指示意義。

Abstract:

Using the conventional data and NCEP/NCAR reanalysis data,this paper analyses the rainfall characters in Meiyu period of Zhejiang province during 2010 and the effects of South Asia high and upper and lower-level jets on Meiyu rainstorm.The results show that(1) The beginning and the ending of Meiyu in Zhejiang province during 2010 were later,and the Meiyu period was obviously longer; the precipitation was more,and heavy precipitation concentrated on southwest of Zhejiang province,moreover it showed gradual decrease step by step towards south and north; rainstorm processes were frequent and concentrated. (2) In Meiyu period,the body of South Asia high was stronger,south-north oscillation and east-west sway were obvious in the process of the gradual strengthening,and south-north oscillation synchronized with westward and eastward shift. There was corresponding between south-north oscillation of South Asia high ridge line and south-north shift of rainstorm. Rainstorm was possible whether South Asia high was stable or changed. Rainstorm mostly occurred when South Asia high changed,and southward movement was synchronous with westward,northward was synchronous with eastward.(3) In Meiyu period,the evolution of upper and lower-level jets was consistent,and there was space-time corresponding between upper and lower-level jets and rainstorm.Rainstorm belt was mostly located in the right side of upper-level jet and the left side of lower-level jet axis,and it swayed south-north with the location of upper and lower-level jets.Moreover,to a certain degrees, the movement of lower-level jet from axis to north edge was coincident with rainstorm belt.The intensity of upper and lower-level jets was closely related to rainfall.The horizontal distance had important influence on the coupling between upper and lower-level jets,and then it effected the development of vertical velocity and precipitation intensity.Therefore,the configuration of upper and lower-level jets has good indication to area and intensity of rainstorm in Meiyu period.

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李洪權,陳中赟,駱麗楠,楊軍,劉雙喜.南亞高壓和高低空急流對2010年浙江梅汛期暴雨的影響.氣象科學,2012,32(3):310-316 LI Hongquan, CHEN Zhongyun, LUO Linan, YANG Jun, LIU Shuangxi. The effect of south Asia high and upper and lower-level jets on Meiyu rainstorm in Zhejiang province during 2010. Journal of the Meteorological Sciences,2012,32(3):310-316

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收稿日期:2011-03-10
最后修改日期:2011-05-31
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在線發(fā)布日期: 2012-06-15
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