利用有限区域模式对1979年1月东亚平均环流和寒潮过程的初步模拟试验  

Preliminary Simulation Experiments of East Asian Mean Circulationand Cold Surge Porcesses of Janurary 1979 Using Limited Area Models

作　　者：张敏锋[1] 刘晓东[1] 焦彦军[1] 

机构地区：[1]中国科学院兰州高原大气物理研究所

出　　处：《大气科学》1998年第3期294-304,共11页Chinese Journal of Atmospheric Sciences

基　　金：国家攀登计划项目

摘　　要：利用不同分辨率的有限区域数值模式，由ＦＧＧＥＩＩｂ分析场提供模式的初始条件和随时间变化的侧边界条件，通过长时间连续积分对东亚地区５６２５～６３７５°Ｎ、６１３７５～１３８７５°Ｅ范围内，１９７９年１月的平均环流和寒潮过程进行了模拟和试验研究。文中首先考察了在研究时段内长时间积分后，模式的计算性能及其稳定性。结果表明，由于强加于模式的侧边界条件的作用，可以使得误差增长控制在一定范围之内。在此基础上进一步分析了误差的时空分布特征及其成因。通过对２４小时变高、２４小时变温负中心值和逐日温压场的分析，发现模式对中长期天气过程有较好的模拟效果，因而具有区域气候模拟的潜力。Two limitedarea models (LAMs), a fine model (FM) and a coarse model (CM), are applied to simulate mean circulation and cold surge processes of January 1979 over East Asia. The FM is a modified version of the CM. The horizontal resolutions are 09375°×09375°lon./lat. in FM and 1875°×1875° lon./lat. in CM respectively. There are 11 vertical levels in FM and 6 levels in CM. The simulation domain covers an area from 5625°N to 6375°N and 61375°E to 13875°E. The initial and lateral boundary conditions (LBC) are taken from the FGGE III b data set. After extending range integration, the feasibility for LAMs to simulate monthly mean circulation and cold surge processes is studied. The results show that because of the strong control of LBC on the growth of errors, LAMs can produce good performance and stable calculation in longterm integrations, and that because of the higher horizontal and vertical resolutions in FM, its simulation is more reasonable and more realistic than that of the CM. The time series in the monthly simulation indicate that the LBC controls the errors unlimited growth with time, however, two relatively higherror periods are found in the monthly simulation. LAMs not only have good simulations on mean circulation, but also can really reproduce main mediumlong term synoptic processes, such as cold surge and so on. So LAMs have potential in modelling regional shortterm climates. 

关 键 词：有限区域 数值模式 东亚 寒潮天气过程 大气环流 

分 类 号：P434[天文地球—大气科学及气象学] P425.54