河北一次暴雨过程中不同时段强降水的成因  

Analysis of Heavy Precipitation at Different Stages During a Rainstorm Process in Hebei Province

作　　者：秦宝国[1,2] 朱刚 

机构地区：[1]兰州大学大气科学学院,甘肃兰州730000 [2]河北省气象台,河北石家庄050021

出　　处：《干旱气象》2013年第2期327-332,共6页Journal of Arid Meteorology

基　　金：河北省气象局项目"河北省级中尺度天气分析业务建设一期"(11KY02)资助

摘　　要：利用NECP再分析资料和常规观测资料,对2010年8月21日河北的一次暴雨过程进行了分析。结果发现:本次暴雨过程降水主要集中在3个时段内发生,并且成因各不相同。20日午夜前后,东北部地区暴雨主要是冷平流和干侵入,在副高外围产生对流不稳定,引发短时强降水;21日08点前后,保定、廊坊地区暴雨的主要成因是低层切变附近强烈的上升运动;而晴空区近地层辐射增温和低压倒槽幅合抬升是21日傍晚东北部地区再次出现短时强降水的触发条件。可见,随着系统的不断演变,暴雨过程的降水成因也在变化。利用最新时次的卫星、雷达、逐小时自动站等观测资料,对天气系统进行跟踪分析,是此类暴雨预报的有效手段。Based on NCEP reanalysis data and conventional observation data, a rainstorm process on August 21,2010 in Hebei was ana- lyzed. The results show that rainfall concentrated in three stages during this rainfall process, and there were different formation reasons for each stage. At midnight of August 20, the rainstorm in the northeast area was mainly caused by cold advection and dry intrusion which made the convective instability on the outside of the subtropical high. From 06：00 to 10：10 on August 21, the main cause of heavy rain in Baoding and Langfang area was the strong ascending motion near the low level shear. While the surface radiation within the clear zone and the convergent uplift made by the inverted trough triggered the short - time heavy rainfall in the northeast area in the evening of August 21. So, along with the evolution of the system, the precipitation during the heavy rain process was also changing. It is an effective means that tracking and analyzing the weather system by using the latest observational data including satellite images, Doppler radar echo and hourly data of automatic weather station.

关 键 词：暴雨 冷平流 干侵入 地面倒槽 

分 类 号：P458.121.1[天文地球—大气科学及气象学]