摘要
本文利用B模式与大气物理研究所有限区域细网格模式进行异模式的单向嵌套试验,调试了三种方案:倾向订正方案、松弛法及辐射边条件方案。几次试验表明,倾向订正方案下的套网格积分最稳定。用套网格计算了1986年梅雨期中几次暴雨过程,预报结果比固定边界的细网格模式有明显改进,暴雨中心值可提高20%以上,降水分布更加接近实际。嵌套技术使细网格模式的积分稳定性加强,减少对平滑的依赖,并且延长降水预报时效。文章还分析了边界条件对暴雨系统的影响。
The B-model and the IAPAS (Institute of Atmospheric Phy-sics, Academic Sinica) limited fine-mesh model are nested in one way,and three schemes, i. e., the tendency correction scheme, the relaxationmethod and the radiative lateral boundary condition scheme, are tested.Tests show that the stability for the integration using the first schemeis the best. Several heavy rain occurrences during the Meiyu period of1986 are studied using the nested fine-mesh model, the forecasting resu-lts of which is greatly improved, with the accuracy of the rainfallvalues increased by more than 20% and the precipitation distributioncloser to actual conditions. The nesting technique stabilizes the integra-tion of the fine-mesh model, lessens the reliance on smoothing, andlengthens time validity of precipitation forecasting. The effect of the boundary conditions on the heavy rain system is also examined.
出处
《南京气象学院学报》
CSCD
1991年第2期195-202,共8页
Journal of Nanjing Institute of Meteorology
基金
75-09-01课题经费资助
