华东地区夏季中尺度对流系统的活动特征及成因研究
投稿时间: 2017-01-11  最后修改时间: 2017-01-11  点此下载全文
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作者单位E-mail
张柳 南京信息工程大学 1024198398@qq.com 
霍利微 南京信息工程大学 huolw@nuist.edu.cn 
潘玉洁 南京信息工程大学  
中文摘要:利用FY-2E卫星云图TBB(black body temperature)资料,对2010-2014年夏季(6-8月)华东地区的α中尺度对流系统(MαCS)和β中尺度对流系统(MβCS)进行统计,发现两种尺度的MCS (Mesoscale Convective System)均具有夜发性,且发生多集中于安徽、江苏、江西和浙江地区,形成后主要自西向东移动。其次,对两种尺度MCS成因的分析结果显示, 850hPa上的切变线和低空急流、500hPa上的副高和中纬度短波槽以及200hPa上的高空急流是影响MCS形成主要的系统。MαCS发生前的天气形势可以分为两类:850hPa的低空急流、生成位置北部的气旋性环流和500hPa槽前的西南气流以及200hPa上的反气旋性环流配合是第一类;850hPa切变线南部的偏西气流、500hPa的偏西气流和200hPa的高空急流配合是第二类。MβCS发生前的两类环流形势中,850hPa切变线均位于生成位置北部,500hPa上生成位置西部受短波槽影响,200hPa上均有西风急流与中低层配合。对流层中层以下的水汽供应、低层大气不稳定性和低层辐合、高层辐散的动力结构是MCS形成的必要条件。
中文关键词:华东地区  中尺度对流系统  活动特征  分类  成因
 
Research on the activity characteristics and the formation cause of MCS over East China in summer
Abstract:By Using TBB (black body temperature) data of FY-2E satellite, statistical research of Meso-α Convective System (MαCS) and Meso-β Convective System (MβCS) occurred over East China in summer (from June to August) during the year of 2010 to 2014 is carried out respectively, which finds two scales of MCS mainly occurred in Anhui, Jiangsu, Jiangxi and Zhejiang area and moved from west to the east are nocturnal. Secondly, the analysis of the formation cause of two kinds of MCS shows the shear line and low-level jet at 850hPa, subtropical high and short wave trough in middle latitude at 500hPa and upper-level jet at 200hPa are the main impact systems before MCS formed. The weather situation before initiation of MαCS can be divided into two categories: the first one is the combination of low level jet and cyclonic circulation in the north of the generating location at 850hPa and the southwest airflow in front of trough at 500hPa and anti-cyclonic circulation at 200hPa, while westerly flow in the south of the shear line at 850hPa and westerly flow at 500hPa cooperated with the upper-level jet at 200hPa belongs to the second category. In the two types of circulation situations before the occurrence of MβCS, the shear line at 850hPa are both located in the northern part of the formation position, corresponding to short wave trough in the western part of the formation position at 500hPa and westerly jet at 200hPa. The water vapor supply in the middle and lower troposphere, atmospheric instability in the low layer and the power structure of convergence at low level and divergence at upper level are the necessary conditions for the formation of MCS.
keywords:East China  MCS  activity characteristics  classification  formation cause
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