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东北地区一次暴雨过程的落区分析
引用本文:王宪彬,张旭,辛艳辉.东北地区一次暴雨过程的落区分析[J].气象与环境学报,2010,26(5):36-40.
作者姓名:王宪彬  张旭  辛艳辉
作者单位:阜新市气象局,辽宁 阜新 123000
摘    要:利用常规高空、地面观测资料和美国NCEP1°×1°的6 h再分析资料对2008年7月5日08时至6日08时发生在东北地区的暴雨过程进行诊断分析。结果表明:此次暴雨过程是蒙古高空槽和华北气旋共同作用下产生的,副热带高压西伸北抬后与东北高压脊叠加形成高压坝,水汽沿高压外围即渤海西岸向东北移动,华北气旋入渤海加强北上,是造成东北地区西部强降水的主要天气形势。风速大于等于16 m/s的低空西南急流的建立为暴雨的发生提供了动力和水汽条件。暴雨到大暴雨过程强降水中心的落区与比湿场的大值区、垂直速度场和涡度场的高值区有较好的对应关系。

关 键 词:副热带高压后部  华北气旋  物理量场  暴雨落区  
收稿时间:2010-9-14
修稿时间:2010-9-3

Falling area of precipitation in a heavy rain process in Northeastern China
WANG Xian-bin,ZHANG Xu,XIN Yan-hui.Falling area of precipitation in a heavy rain process in Northeastern China[J].Journal of Meteorology and Environment,2010,26(5):36-40.
Authors:WANG Xian-bin  ZHANG Xu  XIN Yan-hui
Institution:Fuxin Meteorological Bureau, Fuxin 123000, China
Abstract:Based on the conventional meteorological data and reanalysis data (horizontal resolution 1°×1°) from NECP, the heavy rain process on July 5-6, 2008 in Northeast China was analyzed. The results show that this process is caused by the Mongolia trough and cyclone of North China. Subtropical high pressure moves to the west and lifts to the north, and comes into being high pressure barrier together with high pressure ridge in North China together. Water vapor moves to the northeast along high pressure periphery (in the west bank of the Bohai Sea), and cyclone of North China strengthens over the Bohai Sea and up to the north, which result into strong precipitation in the west of Northeast China. Low level jet with wind speed above 16 m/s can provide abundant water vapor and dynamic for this heavy rain. Location of strong precipitation center has a better corresponding relationship with the large value areas of specific volume field and vertical speed field as well as vorticity field.
Keywords:Rear of subtropical high pressure  Cyclone of North China  Physical value field  Heavy rain falling area
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