层状云降水过程中的风廓线特征  

Characteristics of Wind Profile during Stratiform Cloud Precipitation

作　　者：王秀玲[1] 陈昱[1] 

机构地区：[1]河北省唐山市气象局,唐山063000

出　　处：《气象科技》2010年第4期409-412,I0006,共5页Meteorological Science and Technology

摘　　要：利用唐山风廓线雷达资料,结合天气雷达资料,分析了2009年2月12日的稳定性降水天气过程。分析表明,风廓线雷达能很好地观测到稳定性降水过程中冷、暖切变的小扰动和急流的下传过程,这些小扰动和急流的下传加强、维持了降水;垂直切变的加大、强下沉气流的着地,预示着降水即将开始;低层偏北风的侵入、强下沉气流的消失预示降水将结束。With the data of wind profile Radar in Tangshan,the stratiform precipitation occurred on 12 February 2009 is analyzed.The results show that wind-profiler radar can observe the disturbance of cold or warm shearing and the downward expanding of a jet stream.These small disturbances and downward expanding would enhance and maintain the precipitation.The enhancing of the vertical shear and the strong sinking air indicate the beginning of precipitation.The invasion of northerly winds at lower levels and the disappearance of the strong sinking air indicate the ending of precipitation.

关 键 词：风廓线 稳定性降水 扰动 

分 类 号：P458.121[天文地球—大气科学及气象学]