兼顾空间数据表达与地球系统模式计算的全球离散格网研究

The breakthrough of geoscience can be achieved by large scale numerical simulation based on observation data. Under this background, global discrete grids have been widely researched and used in the fields of surveying and mapping geographic information, atmosphere, ocean and solid Earth. Global discrete grids researched in the fields of surveying and mapping geographic information can support multi-resolution representation of spatial data, but cannot support earth system models, while in the fields of atmosphere, ocean and solid Earth, the situation is just the opposite. As geoscience developed, there is a pressing need for new global discrete grids supporting both spatial data representation and earth system models. However, the significant differences in the subdivision model, encoding model and spatial data organization make it difficult to integrate the two types of grids. Accordingly, we attempt to construct a new global discrete grid——Composite Diamond Discrete Grid (CDDG).Chosen spherical diamond as the basic unit, sphere grid subdivision model and spheroid grid subdivision model of CDDG will be researched, and multiple grid features, such as grid point, grid edge, grid cell and grid volume will be applied in this process. The grid encoding model of CDDG will be designed in considering multiple grid features. Based on this, more research will be devoted to how to make CDDG support spatial data representation and earth system models. The research of our project can support more desirable earth system science computation environment and supply new theory and method for Digital Earth.

未来地球科学的突破是以观测数据为基础，通过大规模数值模拟研究而达到。在此背景下，测绘地理信息领域发展了面向全球多分辨率空间数据表达的全球离散格网；大气、海洋及固体地球等领域发展了面向地球系统模式计算的全球离散格网。为了更好的支撑地球系统科学的研究，迫切需要发展兼顾空间数据表达与地球系统模式计算的全球离散格网。然而，网格剖分模型、编码模型及空间数据组织上的差异使得两类格网难以集成。因此，本项目试图探索构建一种新型的全球离散格网——复合菱形离散格网。以球面菱形为基本单元，综合格点、格边、格元和体元等多种格网组成要素，研究顾及球面及球体空间的格网剖分模型；顾及多种格网组成要素，研究具有层次递归性的格网编码模型；在此基础上研究基于复合菱形离散格网的空间数据表达方法与地球系统模式计算方法。本项目的研究将能够为构建更理想的地球系统科学计算环境提供支撑，为数字地球的发展提供新的理论与方法。

为满足多分辨率空间数据表达与地球系统模式计算的双重需求，本项目构建了一种新型的综合型的全球离散格网，以满足多分辨率空间数据表达与地球系统模式计算的双重需求。在项目实施中，提出了一种统一表达格点、格边与格元的剖分与编码模型，在此基础上构建了一种新型的综合型的全球离散格网——复合菱形离散格网。以此为基础，集成了Global FVCOM模式，实现了全球海洋潮波模拟，为研究构建更理想的地球系统科学研究环境提供新的理论和方法。