Improvements of numerical schemes for the global cloud-resolving climate simulations in near future

日本正在利用“K”和地球模拟器等最先进的超级计算机开发一个最先进的全球云解析模式，该模式不使用积云参数化，直接计算云的微物理过程。人们普遍认为，如果在不久的将来，全球标准物质能够在更快的计算机上运行，将使气候模拟具有更高的可靠性。然而，目前，仍然存在的问题，在全球CRM，甚至在组件称为“动态”，其中包括一组离散化的流体方程，在稳定性和准确性。在这项工作中，新的输运计划和一个新的离散方法的梯度算子的水平方向和部分细胞方法进行了测试，垂直方向。在这项工作中开发的这些计划将提高全球CRM的可信度。

A state-of-the-art global cloud-resolving model (CRM) that computes cloud microphysical processes directly without using cumulus parameterizations is being developed in Japan by using cutting-edge supercomputers such as "K" and the Earth Simulator. It is widely thought that global CRMs will enable climate simulations of higher reliability if they can be run on much faster computers in near future. Currently, however, there remain problems in a global CRM even in the component called "dynamics", which consists of a discretized set of the equations of fluid, in terms of the stability and the accuracy. In this work, new transport schemes and a new discretization method of the gradient operator were developed in the horizontal direction and a partial cell method was tested for the vertical direction. Those schemes developed in this work will enhance a credibility of a global CRM.