青藏高原夏季带状MCSs的分类以及形成原因
投稿时间:2012-11-24  修订日期:2013-03-08  点此下载全文
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作者单位E-mail
丁治英 气象灾害教育部重点实验室(南京信息工程大学), 江苏 南京 210044
南京信息工程大学 大气科学学院, 江苏 南京 210044 
dingzhiying@nuist.edu.cn 
王小龙 气象灾害教育部重点实验室(南京信息工程大学), 江苏 南京 210044
南京信息工程大学 大气科学学院, 江苏 南京 210044 
 
高松 重庆市气象科学研究所, 重庆 401147  
郭宏杰 中国人民解放军94188部队, 陕西 西安 710077  
史永强 中国人民解放军94188部队, 陕西 西安 710077  
基金项目:国家重点基础研究发展计划(973计划)项目(2009CB421503;2013CB430103);国家自然科学基金资助项目(41375058);江苏省优秀科技创新团队基金;江苏高校优势学科建设工程资助项目(PAPD)
中文摘要:利用2007—2011年夏季TBB(black body temperature)资料筛选出夏季青藏高原地区特征比较稳定的带状MCSs加以归类,结合NCEP资料及后向轨迹模型对其成因进行逐类探讨。结果表明,特征稳定的带状MCSs共有37例,可以按形状分为三类:北凸型、南界型和纬向型,其中北凸型发生得最多,纬向型最少。整个夏季有接近30%的时间,特别是在7月有近50%的时间都出现这种稳定的带状MCSs。高层南亚高压以及高空急流和低层500 hPa切变线辐合及其南侧的高温高湿是带状MCSs生成的主要原因。500 hPa上,纬向型带状MCSs一般发生在高原南北两侧较平直的东、西风气流中;北凸型发生时,高原北部为平直的西风气流,孟湾为较强的槽,高原东、南部受西南偏南气流影响;南界型时高原一般为西北气流,南侧有较强的孟湾气旋控制。围绕高原有4个水汽的辐散源地,带状MCSs对流区的水汽主要通过高原南侧和高原东南部的辐散源地进入对流区。
中文关键词:带状MCSs  高原切变线  水汽输送
 
Classification and cause analysis of banded MCSs over the Tibet Plateau in summer
Abstract:Based on TBB data in summer from 2007 to 2011,Banded MCSs(BM) over the Tibet Plateau with stable characteristics are screened out and classified.Causes for BM are discussed in different types by combining with NCEP data and HYSPLIT model.Results show that 37 cases of BM with stable characteristics fall into three types according to their shapes:North convex type(NCT),south boundary type(SBT) and zonal type(ZT).NCT BM are the most while ZT BM are the fewest.These BM occur in 30% time of the whole summer,especially in nearly 50% time of July.The main causes for BM include South Asia high and jet stream on upper level,shear line with convergence at 500 hPa and the air of high temperature and humidity in the south of shear line.At 500 hPa,ZT BM commonly occur between westerly airflow in north side of plateau and eastern airflow in south side of plateau.NCT BM occur under the synoptic situation that there is lank westerly airflow in northern plateau,strong trough in Bay of Bengal and influence of flow from southwest by south on eastern and southern plateau.In the process of SBT BM,there is usually northwest airflow over the plateau and strong cyclone in the south in Bay of Bengal.There are four vapor divergence regions around the plateau and vapor in convective zone mainly derives from south side of southwest edge and southeastern plateau.
keywords:banded MCSs  plateau shear line  vapor transport
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