2007—2013年夏季江淮地區(qū)MCS和MCV與暴雨關(guān)系的統(tǒng)計(jì)特征

doi:10.3969/2014jms.0106

首頁 > 過刊瀏覽>2016年第36卷第2期 >236-243. DOI:10.3969/2014jms.0106

2007—2013年夏季江淮地區(qū)MCS和MCV與暴雨關(guān)系的統(tǒng)計(jì)特征
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                        10.3969/2014jms.0106
                    
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基金項(xiàng)目:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)項(xiàng)目(2013CB430103);國家自然科學(xué)基金資助項(xiàng)目(41375058);江蘇省優(yōu)秀科技創(chuàng)新團(tuán)隊(duì)基金;江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目(PAPD)

Statistical Characteristics of Relations of Rainstorms with MCSs and MCVs in Yangtze-Huaihe Basin during Summer from 2007 to 2013

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利用FY-2D逐時(shí)T_BB資料和NCEP/NCAR再分析資料,對2007-2013年夏季(6-8月)江淮地區(qū)暴雨和大暴雨日的MCS和MCV進(jìn)行普查,將MCS分為圓狀的MCC和MβCCS以及帶狀的PECS和MβECS,并根據(jù)MCV能否激發(fā)新的對流將其分為發(fā)展型和不發(fā)展型。結(jié)果表明:夏季江淮地區(qū)由MCS造成的暴雨和大暴雨日占總天數(shù)的74.3%。追蹤產(chǎn)生暴雨的65次MCS過程中,帶狀MCS所占比例明顯大于圓狀MCS;MCS多生成于江淮中東部的陸地上,以向東-東北和南-東南移動為主,其移動距離集中在1~5個(gè)經(jīng)緯距。暴雨和大暴雨日中出現(xiàn)的MCV主要位于對流層中低層,且多出現(xiàn)在MCS的西側(cè)和北側(cè);PECS和MβECS比MCC更易衍生MCV過程,未出現(xiàn)MβCCS伴隨的MCV個(gè)例。不同類型MCS衍生出的MCV厚度差異很小,MCV的厚度與其類型、對應(yīng)暴雨日的等級無明顯關(guān)系。6-8月,MCV發(fā)生的次數(shù)遞減,MCV多發(fā)生于午后14時(shí)左右,夜間到凌晨很少生成。由MCS引發(fā)的大暴雨日中,有MCV出現(xiàn)的天數(shù)占61.5%,明顯較暴雨日高,大暴雨日中出現(xiàn)的MCV多數(shù)都能引發(fā)"二次對流"。

Abstract:

Based on the FY-2D geostationary satellite black body temperature data and NCEP/NCAR reanalysis data, the mesoscale convective systems(MCSs) over Yangtze-Huaihe basin were classified into MCC, PECS, MβCCS and MβECS during rainstorm and heavy rainstorm days in summer(June-August) from 2007-2013. The mesoscale convective vortex(MCVs) derived from MCSs were divided into two kinds: developed MCVs and non-developed MCVs. The results show that the percentage of rainstorm and heavy rainstorm days caused by MCSs was 74.3%. PECS and MβECS occurred more frequently than MCC and MβCCS among the 65 MCS cases in those rainstorm days. Most MCS cases appeared in the middle and eastern part of Yangtze-Huaihe basin however, there are very few on the sea. The MCS extended east-northest ward and its moving path is mainly limited to 1-5 latitude and longitude degrees. MCVs mainly occurred in the middle and low troposphere and spreaded along Yangtze river, and half of the 24 cases of MCV were located in the western and northern parts of MCSs. The percentage of both PECS and MβECS leading to MCVs was about 41%, and 25% for MCC while no MCV case could be found in MβCCS. The thickness distinction between MCV caused by different kinds of MCSs was quite modest, and it seemed to be independent on its origin MCS type and the grade of rainstorm days. The number of MCV cases declined from June to August and the peak time for MCV initiation was around 14:00 BJT. In the 13 heavy rainstorm days, 8 cases of MCV could be found, most of them could lead to new MCSs or contribute to their original MCSs.

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劉瑞翔,丁治英,王一頡.2007—2013年夏季江淮地區(qū)MCS和MCV與暴雨關(guān)系的統(tǒng)計(jì)特征.氣象科學(xué),2016,36(2):236-243 LIU Ruixiang, DING Zhiying, WANG Yijie. Statistical Characteristics of Relations of Rainstorms with MCSs and MCVs in Yangtze-Huaihe Basin during Summer from 2007 to 2013. Journal of the Meteorological Sciences,2016,36(2):236-243

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收稿日期:2014-08-29
最后修改日期:2014-12-28
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在線發(fā)布日期: 2016-06-13
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