地球系统模式新型高分辨率网格系统研制与应用  

Design of High-Resolution Grid Systems for the Next Generation Coupled Climate System Models and Earth System Models

作　　者：徐世明[1] 陈春刚[2] 安恒斌[3] 李兴良 李艺苑[5] Wright J S 夏坤[5] 王諝 普业[5] 

机构地区：[1]清华大学,北京100084 [2]西安交通大学,西安710049 [3]北京应用物理与计算数学研究所,北京100094 [4]国家气象中心,北京100081 [5]中国科学院大气物理研究所,北京100029

出　　处：《中国基础科学》2017年第5期35-39,共5页China Basic Science

基　　金：国家重点研发计划"全球变化及应对"专项项目(2017YFA0603900)

摘　　要：气候模式是全球变化研究的基本工具之一,网格系统是模式空间离散化的平台,其直接决定着模式的空间解析度,并与模式框架的数值算法紧密互动、影响其精度和计算效率。随着对分辨率和模拟精度需求的不断提升,传统的大气和海洋模式网格分别面临着提高稳定性、计算精度以及计算时效性等诸多挑战。基于国内外现状和前沿,针对下一代地球系统模式和气候系统模式的发展需求,设定了研制具有自主知识产权的新型网格系统的研究目标。针对大气模式高分辨率准均匀网格、嵌套网格和相关数值算法的设计,以解决传统经纬度网格的计算效率和稳定性问题为主要目标,通过高精度算法降低准均匀网格及加密网格的印记误差。针对海洋环流模式设计新型正交网格,利用共形映射构造理论这一数学领域的最新进展,缓解传统网格中计算负载不均衡、海洋陆缘区域分辨率受限等问题。进一步针对关键海气耦合区域开展大气海洋网格协同设计,并开展高分辨率下的高效并行化、支持动态负载均衡和网格加密等功能。开展新型网格在我国自主研发模式和国际典型主流模式中的模式集成和评估。通过算法开源和支撑性数据集的开放使用,以及典型分辨率下的样例网格,为高分辨率模式的构建提供有效支撑。The grid system is the basis of the geophyisical flu-id dynamic models.Coupled climate models and the at-mospheric and oceanic components carry out the spatial discretization based on model grids.Therefore the grid is definitive of the spatial resolution of the model, and have direct influence over the model accuracy,the time stepping and the computational performance.High-reso-lution modeling brings both oppurtunity and challenges to climate studies, and how to effectively utilize the hugh number of freedom of degrees that is enabled by high-resolution grids is the central task.For atmospher-ic models,the research frontier is on the design of glob-al quasi-uniform grids and the accompanying algo-rithms, including the icosahedral grid, the cubed-sphere grid,etc.Specifically,the high-order of accura-cy of the algorithm and the mitigation or elimination of grid imprints is the key research focus.In this project we carry out the optimization of quasi-uniform grids and propose the use of multi-moment constrained finite vol-ume method to improve accuracy and reduce grid noise. For the oceanic grid, due to the comparatively higher resolution as required for the atmospheric grid,the main focus of research is the multi-scale modeling and the im-provement of key ocean-atmosphere interaction regions. We propose the use of complex conformal mappings based on Schwarz-Christoffel mapping to generate multi-scale grids,with the co-design of atmospheric and oce-anic components for maritime continent and the Arctic region.These two regions are both key climate regions and important with societal impacts.High-effiency par-allelization of the new grids is carried out to incorporate spatial refinement and dynamic load balancing.The proposed grid generation methods and related algorithms are developed by Chinese scientists, and have advanta-ges over key apsects over counterparts in the world, in terms of accuracy and computational characteristics. Applications to both domestic and widely used models （such as CESM）are also carried

关 键 词：地球系统模式 高分辨率模拟 网格系统准均匀网格 共形映射 网格局部加密 动态负载均衡 

分 类 号：P409[天文地球—大气科学及气象学]