一次西南低涡发生发展的涡度收支及潜热释放诊断  

Diagnostic Analysis of Vorticity Budget and Latent Heat Release During a Southwest Vortex Development Period

作　　者：陈鹏 刘德 庞玥 何军 周盈颖 

机构地区：[1]重庆市气象台,重庆401147

出　　处：《干旱气象》2015年第6期934-940,共7页Journal of Arid Meteorology

摘　　要：利用NCEP/NCAR再分析资料、地面自动站降水资料,对2010年7月8～10日发生在重庆地区的大暴雨过程进行涡度收支及潜热释放诊断分析。结果表明：（1）再次发展的850 h Pa西南低涡中心与持续发展的700 h Pa低涡中心的耦合发展对此次暴雨过程的发生发展有重要作用;（2）在暴雨过程中,涡度的垂直输送项和水平辐合辐散项对850 h Pa低涡的再次发展及700 h Pa低涡的维持发展起主要作用;（3）降水与低涡基本同步发生,降水带来的潜热释放使得对流中心附近的上升运动不断加强,凝结潜热释放也随之增多,引起非绝热作用增强,导致局地位涡增加和低涡中心附近的正涡度逐渐加大,风场气旋性弯曲显著,低涡环流逐渐形成。Based on the hourly precipitation of automatic weather stations and NCEP reanalysis data,the vorticity budget and latent heat release of the heavy rainfall with southwest vortex occurring in Chongqing on 8 to 10 July 2010 were diagnosed and analyzed. Results are as follows：（ 1） the coupling of the center of regenerating southwest vortex on 850 h Pa with sustaining southwest vortex on 700 h Pa triggered the occurrence and development of the heavy rainfall.（ 2） During the heavy rainfall,the vertical transport and horizontal convergence and divergence terms of vorticity played a dominant role in the regeneration and development of low vortex on 850 h Pa and the sustainable development of low vortex on 700 h Pa.（ 3） The precipitation basically synchronized with the low vortex. The latent heat that caused by precipitation constantly strengthened the upward movement near the centre of convection,then latent heat release increased,which caused PV enhancement,and the positive vorticity near the vortex centre enlarged,which led to significant cyclonic bend of wind field,then the low vortex circulation gradually formed.

关 键 词：西南低涡 低空急流 涡度收支 潜热加热 

分 类 号：P433[天文地球—大气科学及气象学]