一次鞍型场背景下南通局地特大暴雨过程分析  

Analysis on the Process of a Local Heavy Rainstorm in Nantong under the Background of a Saddle Field

作　　者：梅一清 张树民 王坤 缪燕 袁晶 MEI Yiqing(Nantong Meteorological Bureau,Nantong 226018,China)

机构地区：[1]南通市气象局,江苏南通226018

出　　处：《安徽农学通报》2021年第16期179-184,共6页Anhui Agricultural Science Bulletin

基　　金：南通市气象局气象科技项目(NQK202004)。

摘　　要：利用常规气象观测、地面自动站和再分析等资料,分析了江苏南通2020年8月28日夜间到29日早晨特大暴雨降水过程。结果表明:200百帕南通上空附近的辐散为暴雨的出现提供抽吸条件,500百帕鞍型场为此次大暴雨的发生提供了稳定的形势背景场,底层东部沿海切变线维持,南通位于低压倒槽顶部,为降水的发生提供了天气尺度的抬升条件,海洋的水汽输入供应了充足的水汽。强降水发生前,70mm以上大气可降水量中心与强降水落区较一致,且超前于降水峰值约8个小时。强降水阶段,地面中尺度低压北抬发展,降水落区对应低压第一象限;风廓线雷达底层暖湿东南风增强,对临近短时强降水预报有较大参考价值。Based on the conventional meteorological observation data,automatic ground station data and reanaly-sis data,the local heavy rainstorm precipitation process from the night of August 28 to the morning of August 29,2020 in Nantong,Jiangsu Province is analyzed.Results show that the 200hPa divergence near Nantong above pro-vide suction conditions for the emergence of the heavy rain,500hPa saddle for the occurrence of the torrential rain provides a stable background field situation,the eastern coastal shear line,Nantong is located in the lower over top of the tank,the uplifting of the for the occurrence of precipitation weather scale conditions,ocean water vapor sup-ply enough water vapor.Before the occurrence of heavy precipitation,the atmospheric precipitable water center above 70mm was consistent with the heavy precipitation area,and was about 8 hours ahead of the precipitation peak.During the heavy precipitation stage,the surface mesoscale low pressure develops northward,and the precip-itation area corresponds to the first quadrant of the low pressure.The warm wet southeast wind at the bottom of the wind profile radar is strengthened,which is of great reference significance to the prediction of short-term heavy precipitation in the near future.

关 键 词：鞍型场 特大暴雨 中尺度环境 

分 类 号：P458[天文地球—大气科学及气象学]