大气科学2009，Vol.33Issue(6)：1333-1347,15.
初始扰动对一次华南暴雨预报的影响的研究
Impacts of Initial Perturbations on Prediction of a Heavy Rain in South China
摘要
Abstract
A rainstorm process in South Chins during the pre-rainy season of 2006 has been selected in this article. AREMv2.3 mesoscale numerical model is used to simulate the process through adding perturbations to the initial fields of physical variables (temperature, humidity, and wind). The authors analyze the impacts of perturbations of different physical variable fields on the precipitation forecast, the error growth of physical variables, and the pertur-bation energy growth. And the authors also discuss the relationship between the error growth and moist convection, and the impact of perturbations of different amplitudes on the error growth, and the predictability of the mesoscale precipitation in South China. The numerical simulation results show that. the impacts on precipitation are different when adding the perturbations of the actual amplitude normal distribution at initial time to different physical variable fields. For 24-hour precipitation forecast, the temperature perturbation has the greatest impaet on precipitation. Er-ror growth and moist convective instability are closely related. The small-scale and small-amplitude initial errors in-crease rapidly, furthermore in the form of nonlinear growth. This means that there is less predictability in short-term smaller-scale precipitation forecast. Compared with the larger-amplitude perturbations, smaller-amplitude per-turbations can cause smaller error. But smaller-amplitude perturbations develop rapidly and will soon make a great impact on the precipitation forecast. Therefore, it can only improve the prediction quality limitedly, and because the perturbations are in quick nonlinear growth, there will not be much improvement that can be done to bring forward the prediction time.关键词
初始扰动/误差增长/扰动能量/湿对流/可预报性Key words
initial perturbation, error growth, perturbation energy, moist convection, predictability分类
天文与地球科学引用本文复制引用
朱本璐,林万涛,张云..初始扰动对一次华南暴雨预报的影响的研究[J].大气科学,2009,33(6):1333-1347,15.基金项目
国家重点基础研究发展计划项目2004CB418304 （）
