Implementation of CMA-GFS 3D-Var System on the Yin-Yang Grid

作     者：ZHUANG Zhao-rong XUE Ji-shan SHEN Xue-shun LI Xing-liang 庄照荣;薛纪善;沈学顺;李兴良

作者机构：CMA Earth System Modeling and Prediction CentreBeijing 100081 China State Key Laboratory of Severe WeatherChinese Academy of Meteorological SciencesBeijing 100081 China 

出 版 物：《Journal of Tropical Meteorology》 (热带气象学报（英文版）)

年 卷 期：2021年第27卷第4期

页      面：346-354页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：National Key R&D Program of China(2017YFC1501901 2017YFA0603901) 

主　　题：Yin-Yang grid latitude-longitude grid CMA-GFS regional 3D-Var global 3D-Var 

摘      要：The global three-dimensional variational(3D-Var)data assimilation is implemented on a new quasi-uniform overset(Yin-Yang)grid on *** a quasi-uniform spherical grid,it covers the sphere by overlapping two perpendicularly oriented grid components which is nothing but low latitude region of the usual latitude-longitude *** on this characteristic of the Yin-Yang grid,it enables us to implement the regional 3D-Var system efficiently and accurately on the Yin or Yang component grid,*** global analysis could update directly from the regional analysis since they have the same configurations like the precondition of eigenvalue decomposition for vertical direction,recursive filtering for horizontal direction,minimization method and observation operator and so ***,the balance equation and vector wind are needed to be paid more attention on the Yin grid analysis due to its coordinate *** to spread the observation information near the boundary of Yin and Yang grid is a key to the 3D-Var *** double the horizontal correlation length distance in the overset boundary of Yin and Yang grid has successfully solved the *** results show that the analysis on the Yin-Yang grid is reasonable and similar to the result on the latitude-longitude(LAT-LON)*** paper provides a promising strategy for the development of a 3D-Var global system for overset grids.