GRAPES中尺度模式地形有效尺度影响的理想数值试验研究  

AN IMPACT STUDY OF THE OROGRAPHIC EFFECTIVE SCALES FOR GRAPES_MESO MODEL WITH IDEALIZED NUMERICAL SIMULATIONS

作　　者：刘一[1,2] 陈德辉 胡江林[3] 沈学顺[1] 王光辉[3] 

机构地区：[1]中国气象科学研究院/灾害天气国家重点实验室,北京100081 [2]国家气象中心,北京100081 [3]中国气象科学研究院,北京100081

出　　处：《热带气象学报》2011年第1期53-62,共10页Journal of Tropical Meteorology

基　　金：国家科技部"十一五"科技支撑项目课题<交互式观测预报系统技术>(2006BAC02B03);中国气象局公益性行业(气象)专项(CTHY201006016)共同资助

摘　　要：针对区域GRAPES模式,设计并实施了一系列不同属性气流条件下的二维与三维理想数值模拟试验,通过比较分析不同尺度地形的模拟试验表明,模式地形尺度的选择对模式预报能力有着非常重要的影响;同时指出6倍格距的地形尺度可以认为是区域GRAPES模式的最高有效分辨地形尺度,6倍以下尺度的地形对该模式的预报能力是有害的,应该滤除,或通过次网格尺度地形参数化加以考虑。For a given numerical model,kinetic energy spectra analysis showed that the model is limited in effectively simulating the atmospheric motion in certain scales.Similarly,a numerical model is limited in effectively representing the topography.For GRAPES,which scale of topography could be effectively represented？ What is the relationship between the model effective topography and the model resolution？ What is the good method to generate the effective topography for GRAPES_Meso model？ Those are the basic questions to be answered for the scientific design and application of GRAPES model.We carry out a series of ideal numerical tests for simulating the airflow in both two and three dimensional tests under different conditions.The test results showed that the simulations with GRAPES model were quite sensitive to the scales of model topography selected.The effective scale of model topography for the GRAPES is approximately 6 times of the grid size.The simulations would be significantly degraded with a model topographic scale smaller than the grid size.

关 键 词：数值天气预报 模式有效地形 滤波 平滑 

分 类 号：P435[天文地球—大气科学及气象学]