Understanding the Performance of an Unstructured-Mesh Global Shallow Water Model on Kinetic Energy Spectra and Nonlinear Vorticity Dynamics

作     者：Lei WANG Yi ZHANG Jian LI Zhuang LIU Yihui ZHOU 

作者机构：State Key Laboratory of Severe WeatherChinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081 National Supercomputing Center in WuxiWuxi 214011 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 

出 版 物：《Journal of Meteorological Research》 (气象学报（英文版）)

年 卷 期：2019年第33卷第6期

页      面：1075-1097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：Supported by the National Key Research and Development Program of China(2017YFC1502202) National Natural Science Foundation of China(41875135) Basic Research and Operation Founds of Chinese Academy of Meteorological Sciences(2018Y004) 

主　　题：kinetic energy spectra nonlinear vorticity dynamics shallow water model icosahedral model model evaluation 

摘      要：A strategy for evaluating a global shallow water model based on aspects of kinetic energy spectra and nonlinear vorticity dynamics is proposed in this *** kinetic energy spectra and nonlinear vorticity dynamics of a recently developed global shallow water model on an unstructured mesh are evaluated in comparison with the benchmark solutions from a global high-resolution spectral *** results show that the kinetic energy spectra,the rotational and divergent components,the stationary and transient components,and the nonlinear spectral fluxes of the developed shallow water model agree well with those generated by the reference *** addition,the influence of different flux operators for transporting the potential vorticity(PV)is assessed *** is indicated that the second-order flux operator leads to a spurious increase in the kinetic energy at the tail of the spectrum,whereas the upwind third-order flux operator does not support this behavior owing to implicit numerical ***,the nonlinear vorticity dynamics is studied by using colliding *** is found that the grid-point model maintains the symmetrical pattern of vortices,and generates similar kinetic energy spectra and nonlinear spectral fluxes to the reference *** evaluation provides a reference for assessing the shallow water model in terms of nonlinear dynamics,and the developed global shallow water model presents a good example.