摘要
利用鞍山地区常规观测资料和NCEP格点资料,对2012年7月10—11日鞍山地区发生的暴雨过程进行垂直螺旋度诊断分析。结果表明:垂直螺旋度对于暴雨以上量级的强降水的指示作用比散度、涡度和垂直速度等物理量更为敏感。当垂直螺旋度正值中心和面积增大时,降水强度和覆盖范围也会随之加大。而中低层正垂直螺旋度,高层负螺旋度的分布形势,有利于强降水的产生和加强。当有强降水产生时,降水易出现在垂直螺旋度正值中心的前方。
Based on the routine observation data and NCEP grid data on July 10-11 2012,the vertical heliciy was applied to analyze the process of heavy rainfall in Anshan area.The results were as follows ：the indicative role of vertical heliciy is much more sensitive to heavy rainfall compared with some other physical quantities such as divergence 、vorticity and vertical velocity.The precipitation intensity and coverage will increase when the positive center and area of vertical heliciy become magnified.The trend that vertical helicity is positive at lower levers and negative at upper levels contributes to the prosperity of rainfall.And the heavy rainfall is easy to come out in front of the positive center of vertical helicity.
出处
《现代农业科技》
2015年第4期231-233,共3页
Modern Agricultural Science and Technology
关键词
暴雨
动力条件
垂直螺旋度
辽宁鞍山
heavy rainfall
dynamic condition
vertical helicity
Anshan Liaoning
