摘要
采用中尺度数值模式WRF（v2．2）对2007年7月7～9日发生在江苏的一次区域性大暴雨过程进行数值模拟，对模式输出资料，利用位涡与湿位涡理论分析了这次大暴雨维持发展的机制。分析结果表明，正位涡异常区对应着强上升区，低层湿位涡负值中心对应降水中心，高层正值区的移动也能预示雨区的移动，湿等熵面的陡立面的出现致使对流不稳定发展。
A regional heavy rainfall event in Jiangsu during 7 -9 July, 2007 is numerically simulated by running a meso - scale model, the WRF, The PV/MPV theory is employed to investigate the mechanism of the heavy rainfall with WRF model output. It is demonstrated that where the PV value is positive indicates an upward motion area; where the MPV value in the lower level is negative indicates the center of precipitation. The movement of the upper MPV positive area also predicts the same movement in the rainfall area, and the steep slope of isentropic surface causes the evolution of convection.
出处
《广东气象》
2008年第3期9-13,共5页
Guangdong Meteorology
基金
中国气象局气象新技术推广项目(CMATG2008M20)资助
