大气科学2011，Vol.35Issue(1)：105-120,16.
2009年6月3～4日黄淮地区强飑线成熟阶段特征分析
Analysis on the Mature-Stage Features of the Severe Squall Line Occurring over the Yellow River and Huaihe River Basins during 3 -4 June 2009
摘要
Abstract
Using multiple surface observational data at high spatial and temporal resolutions, in conjunction with high resolution data produced using the Doppler weather radar three-dimensional digital mosaic system and the fourdimensional variational assimilation retrieval technique, the severe squall line event that occurred over the Yellow River and Huaihe River basins during 3 -4 June 2009 is analyzed, focusing on its formation background and maturestage features. The strong northwest flow behind the upper trough and the local warning of surface layer due to clear sky solar radiation provided large scale conditions for the formation and accumulation of convective instability energy. The dry ambient atmosphere at the low level with a large temperature lapse rate was favorable for the occurrence of disastrous gale at the surface during the squall line event. The evolution of the squall line and the associated severe convective weather phenomena during its life cycle is described. The surface thunderstorm high and the gust front developed into the most intense ones at the mature stage, when the area the severe convective weather phenomena occurred was largest. At its mature stage, the horizontal size of the squall line system reached the upper limit of meso-β scale, with double bands of strong radar echo inside. The features of cloud and weather phenomena associated with the two bands differed significantly. Based on the retrieved wind field, the vertical distributions of horizontal divergence and vertical velocity at four subregions of the squall line system, namely, the weak echo region before the squall line (P), the strong convective echo band in the squall line main body (C), the secondary strong echo region in the stratiform region (S), and the transition zone (T) are analyzed. There is descending motion within subregions T and S at the middle- and low-levels, with the descending in subregion T being stronger. The stronger downdrafts and thinner layer of divergence at low attitudes within subregions T and S are closely related to the disastrous gale at关键词
强飑线/灾害性大风/四维变分同化风场反演/中低层结构Key words
severe squall line/ disastrous gale/ four-dimensional variational assimilation wind retrieval/ middle- and low-levels structure分类
天文与地球科学引用本文复制引用
孙虎林,罗亚丽,张人禾,刘黎平,王改利..2009年6月3～4日黄淮地区强飑线成熟阶段特征分析[J].大气科学,2011,35(1):105-120,16.基金项目
中国气象科学研究院基本科研业务专项2007R001和2007Y004,国家自然科学基金资助项目40875064、40921003 （）
