江蘇一次大暴雨過程的診斷與中尺度分析

doi:P458.121.1

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江蘇一次大暴雨過程的診斷與中尺度分析
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                        P458.121.1
                    
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基金項目:江蘇省重大科技支撐與自主創(chuàng)新示范工程項目(BE2008618)

A diagnose and mesoscale analysis of a torrential rain process in Jiangsu province

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利用FY-2E衛(wèi)星TBB資料、加密自動氣象站資料、多普勒雷達產(chǎn)品、NECP格點資料,對2010年7月12—13日發(fā)生在江蘇沿江地區(qū)的一次大暴雨過程進行了診斷和中尺度分析。結(jié)果表明:此次大暴雨過程是在有利的大尺度環(huán)流形勢穩(wěn)定維持下發(fā)生的,強度大、中尺度特征非常明顯;高空輻散低空輻合的有利配置和垂直螺旋度是此次暴雨過程的動力機制;非地轉(zhuǎn)風和垂直環(huán)流圈的上升支氣流觸發(fā)了不穩(wěn)定能量釋放,激發(fā)了暴雨過程;正反環(huán)流圈不斷地加強和補充暴雨所需的水汽和能量,使暴雨得以維持;10個中尺度雨團的頻繁活動直接造成了此次暴雨。其中,起重要作用的是合并而成的A、B雨團,雨團的合并使雨區(qū)擴大、雨勢更強、生命史更長;3個β-MCS是造成此次暴雨的中尺度對流系統(tǒng),與雨團發(fā)展直接相聯(lián)系的是≤-62 ℃，甚至≤-72 ℃的冷云蓋。1號β-MCS影響時段內(nèi),由多個對流單體回波合并形成的塊狀對流回波。3號β-MCS影響時段內(nèi),對流單體回波合并后形成一條東西向帶狀回波,在徑向速度場上則出現(xiàn)了逆風區(qū)特征。地面中尺度輻合系統(tǒng)與雨團的發(fā)生發(fā)展關(guān)系十分密切,且對雨團的發(fā)生發(fā)展具有一定的預示作用。

Abstract:

Based on black body temperature data of FY-2E meteorological satellite, Doppler radar images and NCEP reanalysis data, combining the intensive observation of automatic weather station data, a diagnose and mesoscale analysis of the torrential rain along Yangtze river basin in Jiangsu province on July 12-13, 2010 was performed. The results show that the heavy rainfall occurred in the favorable and stable environmental conditions and had the feature of obvious mesoscale. Convergence at the lowlevel, divergence at the upper level and vertical helicity provided dynamic mechanism for the rainstorm process. Upward flow of vertical cell of ageostrophic wind and vertical velocity could trigger the instable energy to be released. A frequent activity of ten rain clusters directly brought about the torrential rain. And the mergered rain clusters called A and B played an important role in heavy rainfall process, and which led to larger rain area coverage, stronger rain intensity and longer life span. Three β-MCS continued to occur in Jiangsu one after another during the course of rainstorm. It deserves extra attention that the development of rain clusters was directly associated with central cold cover in which the temperature fell below -62 ℃, even lower than -72 ℃. The process of heavy rainfall appeared in the area of adverse wind and of the echo clusters merging. The surface mesoscale convergence system had close links with rain clusters and had good indication for rain clusters forecast.

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李曉容,濮梅娟,王嘯華,楊蘇勤,張備.江蘇一次大暴雨過程的診斷與中尺度分析.氣象科學,2012,32(1):53-61 LI Xiaorong,PU Meijuan,WANG Xiaohua,YANG Suqin,ZHANG Bei. A diagnose and mesoscale analysis of a torrential rain process in Jiangsu province. Journal of the Meteorological Sciences,2012,32(1):53-61

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收稿日期:2011-02-12
最后修改日期:2011-04-11
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在線發(fā)布日期: 2012-05-16
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