New Version of the CMA-GFS Dynamical Core Based on the Predictor–Corrector Time Integration Scheme  

作　　者：Xueshun SHEN Yong SU Hongliang ZHANG Jianglin HU 

机构地区：[1]CMA Earth System Modeling and Prediction Centre,China Meteorological Administration(CMA),Beijing 100081 [2]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081

出　　处：《Journal of Meteorological Research》2023年第3期273-285,共13页气象学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(42090032 and 42275168).

摘　　要：The operational numerical weather prediction system established by the China Meteorological Administration(CMA),based on the Global/Regional Assimilation and Prediction System(GRAPES)model,adopts the classical semi-implicit semi-Lagrangian(SISL)time integration algorithm.This paper describes a major upgrade to the dynamical core of the CMA global forecast system(CMA-GFS),which was successfully incorporated into operation in 2020.In the upgrade,the classical SISL is further developed into a predictor–corrector scheme,a three-dimensional(3D)reference profile instead of the original isothermal reference profile is applied when implementing the semi-implicit algorithm,and a hybrid terrain-following vertical coordinate system is also applied.The new version of the dynamical core greatly improves the model performance,the time integration reaches second-order accuracy,the time step can be extended by 50%,and the efficiency is greatly improved(by approximately 30%).Atmospheric circulation simulation is systematically improved,and deviations in temperature,wind,and humidity are reduced.The new version of the dynamical core provides a solid foundation for further development of the entire operational system of the CMA.

关 键 词：Global/Regional Assimilation and Prediction System(GRAPES) China Meteorological Administration global forecast system(CMA-GFS) PREDICTOR-CORRECTOR three-dimensional(3D)reference profile 

分 类 号：P456[天文地球—大气科学及气象学]