TRMM卫星的闪电观测资料在中尺度数值模式中的Nudging同化应用研究  

Application of Lightning Observations of TRMM Satellite to the Mesoscale Numerical Model by a New Nudging Assimilation Adjustment Technique

作　　者：冉令坤[1] 周玉淑[1] 

机构地区：[1]中国科学院大气物理研究所

出　　处：《大气科学》2011年第6期1145-1158,共14页Chinese Journal of Atmospheric Sciences

基　　金：中国科学院知识创新工程重要方向项目KZCX2-YW-206;中国科学院大气物理研究所领域前沿项目IAP07201;国家自然科学基金资助项目40875032;40875002;41075098

摘　　要：在以往研究的基础上,本文提出一种利用TRMM卫星闪电观测资料改善中尺度数值模式水物质初始场的Nudging同化技术,这是把物理初始化方法与Nudging同化方法相结合的一种技术。根据TRMM卫星闪电观测水平分布,对水汽和云凝结物进行Nudging同化,对积云对流参数化方案进行调整,改变模式初始水汽和云凝结物场的含量,以达到提高中尺度数值模式初始场质量的目的。本文把这种Nudging同化技术应用于一次短时降水过程的中尺度数值模拟,结果分析表明,这种Nudging同化技术有利于增加模式初始场中水汽和云凝结物含量,特别是水汽和云水的含量,实现水汽和云凝结物的合理空间分布,改善中尺度数值模式短时降水和云凝结物的预报效果,这在一定程度上验证了该Nudging同化技术的可行性。A new nudging assimilation adjustment technique is proposed, which may be used to assimilate the lightning observations of TRMM satellite into the initial fields of the mesoscale numerical model. The technique combines the physical initialization technology with the nudging technology. According to the observed lightning intensity and spatial location, the assimilation technique adjusts the content and spatial distribution of water vapor and five cloud hydrometeors in the initial fields of the numerical model, and thereby improves the initial condition of model and increases the accuracy of 0-6-hour short-term rainfall forecast of the mesoscale numerical model. The nudging assimilation adjustment technique is further used to assimilate the lightning observations of TRMM satellite into the initial conditions of three short-term precipitation events simulated by the ARPS model. The results show that, the assimilation of observational lightning data may increase water vapor and cloud hydrometeors in the initial condition and reasonably rearrange the spatial distribution of water substances. The short-term forecast of precipitation and cloud hydrometeors by the mesoscale numerical model is effectively enhanced.

关 键 词：Nudging同化 TRMM卫星 闪电观测 云凝结物 

分 类 号：P405[天文地球—大气科学及气象学]