【作者】 王金兰； 寿绍文； 张广周； 王晓芳； 张凤洲；

【Author】 Wang Jinlan1,2, Shou Shaowen1,Zhang Guangzhou3 ,Wangxiaofang4, Zhang Fengzhou2 (1. Jiangsu Key Laboratory of Meteorological Disaster,Nanjing University of Information Science & Technology, Nanjing 210044; 2. Xinxiang Meteorological Bureau,Henan, 453003; 3. Pingdignshan Meteorological Bureau,Henan 467000; 4. Institute of Wuhan Heavy Rain, CMA, Wuhan 430074)

【机构】 南京信息工程大学江苏省气象灾害重点实验室； 平顶山市气象局； 中国气象局武汉暴雨研究所； 新乡市气象局；

【摘要】 利用NCEP再分析资料和实时观测资料,用中尺度数值模式MM5对2007年8月25日豫北暴雨过程进行了数值模拟。结果表明:这次暴雨过程水汽主要辐合在700hPa以下;低层强辐合区配合高层强辐散区才能触发暴雨天气的爆发,250hPa附近的辐散区对暴雨的贡献更大;螺旋度线的高密集区对应着暴雨落区,密集度的强度变化对应着暴雨强度变化;干层携带高层冷空气的下沉逼迫作用,促进了对流层在垂直方向的深厚发展;在低空新生成的热力正环流的生消对暴雨的加强和维持起着重要作用。更多还原

【Abstract】 This paper presents results of simulations for a case of heavy rain that occurred in august 2007 over north of Henna province using the fifth generation Penn state/NCAR mesoscale model(MM5).The model result recaptures the major observed features of these events as well as the associated mesoscale system.;The moisture was centralized under 700hPa;The disposition of the lower-level convergence and upper-level divergence were very favorable for the generation and development of the heavy rain; The density of helicity were in agreement with the evolution of precipitation intensity at the center of the rain cluster; The cold air come from dry-level was very favorable the accumulation of unstable energy in low level;the evolution of direct circulation was important to heavy rain。更多还原