摘要
用尺度分离方法对自动站风场进行处理,结合多普勒雷达对2010年8月18日四川盆地西部暴雨过程进行分析,结果表明:强风暴影响地区的地面风场从非常零乱逐渐变得有组织性,这个组织性表现在风向的一致性和风速的增强;对流回波生成的源地是在地形的作用下,中尺度辐合线长时间存在的地区和中尺度正涡度长时间维持的地区,这些地区有利于对流回波的发展加强;对流回波移入辐合区,有利于回波加强,强回波移入辐散区,则回波属于减弱趋势。
By studying wind field in automatic weather station by scale separation method,combining Doppler radar in 2010,the article analyzed the rainstorm in western part of Sichuan Basin on August 18th.It shows the surface wind gradually changed from the very messy situation to regular status,which is reflected on the consistency of wind direction and the enhancement of wind speed;convection echo is generated by terrain influence.Convection echo can be enhanced in areas of meso-scale convergence line existed for a long time and areas of meso-scale positive vorticity maintained for a long time;if convection echo moves into convergence zone,it is conducive to strengthen the echo,and if strong echo moves into divergence zone,then the echo tends to be weaken.
出处
《高原山地气象研究》
2011年第4期24-28,共5页
Plateau and Mountain Meteorology Research
基金
四川省气象局课题"四川盆地地面中尺度要素场与短时强降水的关系"
关键词
中尺度
尺度分离
涡度
散度
辐合线
meso-scale
scale separation
vorticity
divergence
convergence line
