福建一次秋季暴雨天气过程的机制分析  

Analysis on mechanism of an autumn rainstorm process in Fujian

作　　者：吴婷婕 周顺武[1] 陈艺芳 阎访[1,4] 徐威[1] 王宇飞 

机构地区：[1]南京信息工程大学大气科学学院,南京210044 [2]福建省气象服务中心,福州350001 [3]莆田市气象局,福建莆田351100 [4]石家庄市气象局,石家庄050081 [5]福州市气象局,福州350001

出　　处：《中国科技论文》2016年第9期970-976,共7页China Sciencepaper

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB955204);国家自然科学基金资助项目(41275095);公益性行业(气象)科研专项资助项目(201506005)

摘　　要：为探讨秋季暴雨的形成机制,利用WRF模式对福建2011-11-08-2011-11-10的大范围暴雨天气过程进行了数值模拟,在验证模拟结果有效的基础上,利用WRF模式输出的高分辨率资料,对其动力和热力条件进行了诊断分析。结果表明,福建秋季暴雨产生在高层西南急流控制、低层热带低压逐渐北抬,且与冷空气相互作用的形势下,具有降水均匀、持续时间长且有明显阶段性的特点。内陆和沿海的降水机制不同,雨带位置与西南急流辐合线、低空急流脉动有着紧密的联系。低层冷平流区和上升运动区相互叠置,低层正垂直涡度区与负散度区叠加,能很好地反映降水落区。正涡度柱和负散度柱对应了最强小时降水,可作为暴雨落区和雨强的指示物理量,为福建秋季暴雨预报提供参考。To analyze the mechanism of autumn rainstorm,a large-scale rainstorm process during 8-10 November 2011in Fujian is simulated using the Weather Research Forecasting（WRF）model.Based on reliable simulation,the dynamic and thermodynamic diagnosis is analyzed.The results suggest that the heavy rainfall with long duration and uniform precipitation are influenced by the collective effects of southwest jet in the south side of the mid-level shear,northward movement of low-level tropical depression,and cold air from the north.There are obvious different stages during the whole process and different mechanisms of inland and coastal precipitation.The precipitation location is closely related to the southwest jet convergence line and low-level jet pulsation;Low-level negative temperature region imbricate with upward motion region and low-level positive absolute vorticity region imbricate with negative divergence region,which determine the precipitation area well.The positive vorticity column and the negative divergence column correspond to the strongest hourly precipitation,hence they can be used to indicate the rainfall area and rainfall intensity,providing a reference for Fujian autumn storm forecast.

关 键 词：秋季暴雨 WRF模式 数值模拟 机制分析 福建 

分 类 号：P458.121.1[天文地球—大气科学及气象学]