【作者】 王硕甫； 钟兰頔； 李瑞； 李彩玲；

【Author】 Wang Shuo-fu;Zhong Lan-di;Li Rui;Li Cai-ling;Foshan Meteorological Office of Guangdong;Chengdu University of Information Technology;Sanya Air Traffic Management Station of CAAC;

【机构】 广东省佛山市气象局； 成都信息工程学院大气科学学院； 中国民航三亚空管站；

【摘要】 为了研究台风暴雨的环流特征,利用NECP/NCAR 1°×1°再分析资料,应用中尺度WRF模式对"尤特"进行数值模拟。模拟结果表明,副高的位置、西南季风急流的水汽输送和大尺度辐合是造成华南地区大范围暴雨的重要原因。并利用模拟结果,对台风暴雨的垂直螺旋度特征的进一步研究指出,垂直螺旋度能很好地反映低层大气辐合、高层大气辐散的垂直结构,螺旋度大值中心的位置与台风暴雨落区有较好的对应关系,螺旋度迅速增大预示着降水急剧增加,对台风暴雨的强度和落区预报有较好的指示作用。更多还原

【Abstract】 Using the NCEP/NCAR 1° × 1° reanalysis data and WRF model, number simulations of typhoon Utor were conducted to investigate the large scale circulation of typhoon rainstorm. Simulation results show the location of subtropical anticyclone, the vapor transmission of low-level jet and large scale convergence were the reasons for the large scale rainstorm over South China. Further analyses of vertical helicity reveal that vertical helicity can accurately reflect low-level convergence and high-level divergence in the vertical structure of the atmosphere, the max value center of vertical helicity is fitting well with the area of typhoon rainstorm, and rapidly increasing of helicity indicates the precipitation increasing dramatically. The vertical helicity has good indicative meanings to forecast of typhoon rainstorm.更多还原