摘要
利用MM5模式对2002年8月10～11日发生在闽东的一次暴雨过程进行了数 值模拟和诊断分析．结果表明:暴雨中心位于低层正螺旋度中心附近。而且雨强的变 化与正螺旋度的变化近于一致．在MM5模式能较好地模拟本次过程的基础上,对地 形和风场做了对比试验．试验结果表明:地形对暴雨有较强的增幅作用;风速垂直廓 线的线性和非线性分布激发产生的中尺度重力惯性波和涡旋Rossby波,在切变基流 中有可能发生不稳定而导致暴雨天气过程的产生．
By using PSU/NCAR＇s mesoscale NWP model （ MM5 ） , the rainstorm process occurred in the east of Fujian Province during 10 ～ 11 August 2002 was numerically simulated and diagnostically analyzed. It was shown that the center of rainstorm was near that of positive helicity in lower level, and the evolution of rain intensity was coincident with that of positive helicity. Based on the successful simulation, the comparison experiments on terrain and wind field were carried out. The results suggested that terrain can enhance the precipitation, the linear and nonlinear distribution of wind profiles would generate mesoscale gravity inertia wave and vortex-Rossby wave, which could become instable in the shear base flow and result in the rainstorm. possibly
出处
《台湾海峡》
CAS
CSCD
北大核心
2005年第4期433-439,共7页
Journal of Oceanography In Taiwan Strait
基金
国家重点基础研究发展规划项目(2004CB418301)国家自然科学基金资助项目(40433007)上海市台风研究基金课题资助项目(2004)
