摘要
MM5模式中有多种积云参数化方案可供选择,不同参数化方案及分辨率对降水预报有很大影响。本文利用4种积云参数化方案(GR,KF,BM,AK)对辽东半岛一次大暴雨过程进行试验,结果表明,不同的参数化方案,对强降水落点及强度的模拟,结果差别较大。模拟较好的是GR方案,最差的是AK方案;4种积云对流参数化方案模拟的海平面气压场差别较大,其中GR方案模拟出造成2005年第5号台风暴雨的高低压系统和中尺度气旋;粗网格采用一定的积云对流参数化后,可在一定程度再现一些中尺度特征;4种方案由于闭合假设不同,模拟的云物理特征存在很大差别,这种差别对各种天气要素的准确预报会产生一定的影响。
The MM5 model supplies several cumulus parameterization schemes （CPSs）, each of which as well as the differentiating rate influence on the rainfall forecast very much. This paper carried out an experiment on the Liaodong Peninsula rainstorm process on the basis of four CPSs（GR,KF,BM,AK） and it is found that the simulation results of different CPSs on the points of severe rainfall and rainfall intensity are quite distinct, with the best result from GR and the worst result from AK. The four CPSs simulate vary air pressure areas above the sea level, of which the GR scheme successfully made out both the high low air pressure systems and mesoscale vortex gave rise to the rainstorm. The coarse grid domain can reappear to a certain extent some characteristics of the mesoscale vortex after adopting CPS. Because there are different closure assumptions in four CPSs, the simulated cloud physical characteristics differ accordingly, hence impacts the accuracy of prediction on different weathers.
出处
《高原气象》
CSCD
北大核心
2008年第6期1288-1294,共7页
Plateau Meteorology
基金
国家自然科学基金项目“东海黑潮三维结构及季节变化研究”(40406009)资助
关键词
MM5模式
大暴雨
中尺度系统
数值模拟
对流参数化
MM5 Model
Rainstorm
Mesoscale system
Numerical simulation
Convection parameterizatlon
