国家气象中心新一代业务中期预报模式T213L31的主要特点

T2 1 3中期数值预报系统于 2 0 0 2年 9月 1日起在国家气象中心正式业务化。作为此系统核心的T2 1 3L31全球模式与原业务模式T1 0 6L1 9相比 ,采用了一些新的数值技术 ,包括半拉格朗日时间积分方案的引入 ,采用规约格点 ,分布内存与共享内存并行相结合 ,从而在目前有限的计算机资源条件下 ,能积分高分辨率的模式。更重要的是 ,模式采用了一些更新、具有更真实物理概念的物理过程参数化方案 ,对于辐射方案、次网格尺度地形参数化、积云对流方案、云方案、陆面过程方案都作了很大改进 ,从而克服了许多T1 0 6L1 9模式中存在的问题 ,明显提高了T2 1 3L31模式的预报技巧。

A New Generation of Operational Medium-range Weather Forecast Model T213L31 in National Meteorological Center

The medium-range numerical weather forecast system T213 became an operational one on 1 September 2002 in the National Meteorological Center. As the core of the new system, the global model T213L31 uses some new numerical techniques and time integration scheme, which include the introduction of the semi-Lagrangian treatment of advection, the use of a reduced Gaussian grid, improvements to the model's basic architecture, the application of distributed memory and shared memory parallelization, realizing the running of high resolution model on the computers now available in National Meteorological Center. It is even more important that, T213L31 uses some new physical parametrization schemes with more realistic physical concept, for example, the schemes for radiation, subgrid-scale orographic drag, convection, clouds and land surface parametrization, therefore overcomes a lot of problems that T106L19 suffers and enhances the forecast skill obviously.