东亚季风经向环流数值模拟及结果分析Ⅱ．模式性能检测及个例分析

局地径向环流诊断模式性能检验及对1994年5月1日世界时12时东亚季风区局地平均经向环流的模拟分析，分析所用的是经中科院大气物理研究所处理过的NCEP／NCAR再分析逐日资料，结果表明，在现行资料条件下模拟达到了预期的效果，证明该模式对局地经圆环流模拟性能良好，在此基础上，根据线性方程的叠加原理，进一步诊断分析方程中强迫项对向环流所起的作用。对1994年5月1日世界时12时东亚季风区局地平均径向环流而言，模拟出的各项的作用与对天气实况进行理论上的定性分析结果是相吻合的，在东亚季风区的经向环流形成过程，温度平流及绝热加热的作用相当显著，非绝热加热的作用在本文中没有作确切地比较，因其计算受到水汽资料精度和各层辐射资料缺乏的限制，另外，对流中的云物理过程也暂时未加以考虑。

A Numerical Simulation ofLocal-zonal-mean Hadley Circulation over East Asia

A case study is performed numerically with the linear partial differential equation for the stream function of the forced Hadley circulation within monsoon region (given in previous papers) . The data used for the study are NCEP/NCAR reanalysis data provided by Institute of Atmospheric Physics, Chinese Academy of Science in Beijing. The numerical results show that the Iocal-zonal-mean (95～115°E) simulated meridional wind pattern agrees quite well with the “observed” meridional wind pattern at 1 200 UTC May 1, 1994 over the East Asia. Based on this convincing result, an investigation of the contribution made by individual internal physical process is carried out with the benefit of the linearlity of the diagnostic equation. The investigation shows that temperature advections combined with adiabatic processes play an important role in forcing the meridional circulation at 1 200 UTC May 1, 1994 over East Asia besides the diabatic processes.