一条具有宽阔尾随层状云区的中纬度飑线的中尺度结构
投稿时间:1987-07-03  修订日期:1987-11-15  点此下载全文
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寿绍文 美国华盛顿大学大气科学系 
Houze. R. A. Jr. 美国华盛顿大学大气科学系 
中文摘要:1985年6月11日,一条具有宽阔的尾随层状云区的强飑线经过美国堪萨斯—俄克拉荷马州的PRE-STORM中尺度网。本文应用由14个探空站得到的53个探空资料,对这条飑线在成熟价段和消亡阶展的运动学和热力学结构分别作了合成分析。分析表明,飑线系统有稳定的中尺度环流,一股由前向后的入流及一股由后向前的入流构成了环流框架。在对流区,高层辐散、低层辐合,整层上升。在层状云区,中层福合,高、低层分别为上升和下沉运动。雷达次级强回波区与层状云区高层的上升运动区相对应。在层状云区中低层有一气旋性涡旋。
 
THE MESOSCALE STRUCTURE OF A MID-LATITUDE SQUALL LINE WITH A WIDE TRAILING STRATIFORM REGION
Abstract:On June 11, 1985 a severe squall line with a wide trailing stratiformregion passed through the meso-netwrok of PRE-STORM in Kansas-Okla-homa.A total of 53 rawinsonde observations made at 14 stations wereused to make a composite analysis of the kinematic and thermo dynamicstructure of the squall line at its mature and dissipating stages. The frame of the air flows relative to the traveling squall line systemincluded a warm moist front-rear inflow and a cold dry rear-front inflow.In the convective region divergence was observed at the upper and con-vergence at the lower level,thus causing an updraft in the whole tropo-sphere.In the stratiform region convergence was observed at the middlelevel with an updraft at the upper and a downdraft at the lower. A mid-level vortex could be found below the stratiform region.The distribution of the vertical motion was consistent with the radar reflectivity distri-bution which is characterized by a convective echo, a stratiform echowith a secondary maximum region inside,and a transition zone between the convective echo and the secondary maximum region. The results were compared with the mid-latitude squall line deline-ated by Ogura and Liou(1980).
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