【作者】 傅灵艳； 岳彩军； 寿绍文；

【Author】 Fu Lin-yan~1,Yue Cai-jun~2,Shou Shao-wen~1 (1.Nanjing University of Information Science & Technology.Jiangsu Key Laboratory of Meteorology Disaster and School of Atmospheric Sciences.Nanjing 210044,China;2.Shanghai Typhoon Institute of the China Meteorological Administration,Shanghai 200030.China)

【机构】 南京信息工程大学江苏省气象灾害重点实验室大气科学学院； 中国气象局上海台风研究所；

【摘要】 利用WRF中尺度模式模拟了台风"圣帕"(2007)登陆后减弱成热带低压造成湘赣地区大暴雨的过程,并借助非地转湿Q矢量(Q~*)及其分解对这次暴雨过程做了详细的诊断分析。结果表明:800hPa的Q~*矢量散度场的辐合强度及其辐合中心位置对降水强度及雨区位置有非常好的指示作。将"总"Q~*矢量分解成平行和垂直于等位温线两部分后,揭示出了不同尺度强迫的不同作用:在暴雨强盛时期,大气以中小尺度运动为主,在暴雨发生前、后时期,大气以大尺度运动为主。此外,非地转湿Q矢量散度辐合强迫产生的次级环流也有助于本次暴雨发展与维持。更多还原

【Abstract】 Using mesoscale model WRF to simulate the course of heavy rainstorm caused by typhoon"Sepat"(2007)being weakened to tropic cyclone after landing in Hunan province, detailed diagnostic analysis on the rainstorm is done with method of wet Q vector.It shows that the divergence of wet Q vector on 800hPa has good indication to precipitation forecast,its convergence and intensity correspond to precipitation area and intensity.By dividing the wet Q vector into two parts of parallel and perpendicular to isotherms,it indicates the largely different effects of these scales during differing phases of the rainstorm.During the intense stage,the meso-scale evolves into the primary factor of forcing vertical motion;during the developing and decaying stage,the large-scale plays a predominant role in forcing vertical motion.Besides,the secondary circulation motivated by the divergence of ageostrophic wet Q vector is help to the mechanism to maintain rainstorm.更多还原