一次副高控制下的江西暴雨过程模拟分析  

SIMULATION ANALYSIS OF A HEAVY RAIN PROCESS UNDERTHE CONTROL OF SUBTROPICAL HIGH IN JIANGXI PROVINCE

作　　者：张娟娟[1] 陈云辉[1] 

机构地区：[1]江西省气象台,江西南昌330046

出　　处：《气象与减灾研究》2012年第3期18-25,共8页Meteorology and Disaster Reduction Research

基　　金：江西省科技支撑计划项目(编号:20111BBG70031-4);公益性行业(气象)科研专项(编号:GYHY201106003)

摘　　要：利用WRF数值模式输出的高分辨率模式资料,对2010年7月14—15日江西出现的一次副高控制下的暴雨过程进行了分析。结果表明,此次暴雨过程同样也存在充沛的水汽输送,比湿、水汽通量散度基本都达到江西暴雨的阈值;暴雨区以北能量锋区密集,梯度达到12 K/纬距,大暴雨出现在强能量锋区南缘的高能量舌中;干冷气流侵入地面暖槽,地面扰动有利于强不稳定能量的释放,激发中尺度对流系统发展;强降水发生在切变线附近的西南气流中,并且强降水发生时中低层为一致的上升运动;低层辐合、高层辐散的抽吸作用对上升运动的维持十分有利;300 hPa层以下有正涡度柱存在,在其两侧有下沉气流,并有次级环流存在。Using the high resolution model output data of WRF,the rainstorm during 14—15 July 2010 in Jiangxi Province is analyzed.The results indicate that during the process,abundant water vapor transport exists,and specific humidity and the water vapor flux divergence reach the storm threshold values of Jiangxi Province.Frontal zone is intensive in the north side of rainstorm area and the energy front gradient reaches 12 K per latitude distance.Heavy rain appears in high-energy tongue area,which is in the southern margin of strong energy frontal area.Dry and cold air intrudes surface warm trough,and strong unstable energy is released by the surface disturbance,which induces MCS development.Heavy rain occurs in the area of south wind flow near the shear line,and ascent motion occurs from middle to low level.The structure of lower-level convergence and upper-level divergence is very favorable for ascent motion.There is positive vorticity column below 300 hPa,on both sides of the positive vorticity column there are sinking airflow and secondary circulation.

关 键 词：WRF 暴雨 次级环流 中尺度系统 

分 类 号：P458.121[天文地球—大气科学及气象学]