三维嵌套技术在有限区域模式长时间积分中的初步应用  

Preliminary Application of Three Dimensions Nesting to Limited Area Model in Long-term Integral

作　　者：王晓峰[1] 李永平[1] 马晓星[2] 张瑞怡 

机构地区：[1]上海台风研究所,上海200030 [2]上海中心气象台,上海200030 [3]上海气象影视中心,上海200030

出　　处：《应用气象学报》2007年第1期124-128,共5页Journal of Applied Meteorological Science

摘　　要：在复杂地形条件嵌套细网格模式基础上,利用球圈模式与有限区域模式自嵌套,就三维嵌套方法在长时间积分中的模拟结果进行了初步分析。结果表明:三维嵌套对垂直层次选取较敏感;在长时间积分中模式运行稳定,积分时间越长,其优势越明显。这为有限区气候模式侧边界方案提供了新的思路。A new nesting technique called three dimensions nesting （3DN） is used in a regional model which is nested in a circulation model based on the complex terrain with high resolution model （YH model）. A long term integral is achieved steadily which provides a useful way to process the lateral boundary conditions for regional climate model. 3DN means not only keeping horizontal lateral boundary stable but also changing ways to use GSM data in vertical dimension. The primary results show that only with the appropriate high level data that the long term integral could obtain better outcomes in 3DN model. During the prophase integral, 3DN has an obviously positive impact just on the levels lower than 500 hPa, but not for the other levels. However, with the growing process of integral period, the good effect of 3DN is exhibited gradually. The variance of each level is smaller than the one derived from the two dimensions nesting （2DN） model, particularly for the high levels compared with the result from the prophase integral. As for the mean deviation of height field at 500 hPa level during the whole integral period, the variances of these two nesting technologies have a common character that is the value of deviation decreasing from the North to the South. In the eastern integral area, the deviation of 3DN is obviously smaller than the one of 2DN and more similar to the reference field. The mean variance of the u field for each level in the whole integral time shows that 3DN is better than 2DN atthe levels which are lower than 100 hPa; while the one of the v field progresses at all levels. At 100 hPa level, the improved percentage is nearly up to 5 % and much better than that of the u field. In the long integral period,dynamic energy and geopotential height keep their stableness with a small swing range, which indicates that 3DN can be run steadily in long term integral numerical experiments. Large scale precipitation, vapor flux and so on are analyzed. 3DN is obviously better than 2DN for large scale precipit

关 键 词：三维嵌套 球圈模式 侧边界 

分 类 号：P467[天文地球—大气科学及气象学]