北京地区一次暴雨过程分析  

Analysis on a Heavy Rainfall in Beijing Area

作　　者：陈震[1] 王丹 许欢[3] CHEN Zhen WANG Dan XU Huan(Tangshan Meteorological Bureau in Hebei Province,Tangshan Hebei 063000 Qian＇an Meteorological Bureau Guangzhou Meteorological Bureau in Guangdong Province)

机构地区：[1]河北省唐山市气象局,河北唐山063000 [2]迁安市气象局 [3]广东省广州市气象局

出　　处：《现代农业科技》2017年第15期188-189,共2页Modern Agricultural Science and Technology

摘　　要：利用常规观测资料、NCEP/NCAR FNL 1°×1°时间分辨率为6 h的再分析资料对2015年7月16—17日发生在北京地区的一次暴雨过程进行分析。结果表明,高空槽和西太平洋副热带高压(以下简称副高)、日本海高压是主要的大尺度影响系统;日本海高压与高纬度阻塞高压同相位叠加阻挡高空槽东移,使低压槽长时间稳定少动。同时副高加强北抬,副高西侧西南暖湿气流与低槽后部西北干冷气流在华北地区相遇,造成此次强降水过程;低空急流虽不明显,但华北地区处于高空急流的右后侧,高空辐散条件较好。低层水汽丰富,偏东气流将东海洋面水汽向华北地区输送,2015年第12号台风"浪卡"也是重要的水汽输送源,源源不断的水汽向华北输送,则高温高湿的不稳定能量在华北地区聚集,大气层结处于条件不稳定状态。在暴雨发生前和发生时,假相当位温随高度递减,是有利于强降水的不稳定大气层结。地形对本次暴雨起到了重要的动力作用。By using conventional observation datas,NCEP/NCAR FNL 1°×1° every 6 hours reanalysis data,the heavy rainsfall occurred in Beijing during July 16 to July 16,2015 was analyzed.The results showed as follows ：upper trough ,western pacific subtropical high and Sea of Japan high were the main large scale affected the system.Upper trough was blocked by blocking high and Sea of Japan high,it kept stable for a long time. Simultaneously, subtropical high continued to strengthen and moved northwards, the warm current at west side of subtropical high and cold current at northwest converge in North China, caused the heavy rainfall. Although low-level jet stream was not obvious, North China was at the right rear of the high altitude jet,high altitude divergence conditions were better.Guided by the low-level Partial airflow ,low-level moister was abundant ,the eastward airflow would transport the East China Sea surface water vapor to the North China region.The 12th typhoon＂Nangka＂in 2015 was also an important source of water vapor. Because of the moisture transfer and the latent heat transfer,unstable energy accumulated in North China,the atmospheric stratification was unstable.Before and after the occurrence of heavy rainfall, potential pseudo-equivalent temperature decreased with height, which was conducive to the precipitation of unstable atmospheric stratification.The terrain had played an important dynamic role in this heavy rainfall.

关 键 词：暴雨过程 环流形势 物理量诊断 北京地区 

分 类 号：P458.121[天文地球—大气科学及气象学]