关于东亚地区夏季季风环流圈的数值试验

本文利用一个包含有各种非绝热加热作用、摩擦耗散以及大气湿过程的原始方程模式在有山脉的条件下模拟出东亚地区的季风经圈环流和两条强降水带,与实况比较一致。削减大气水汽含量、去掉积云对流过程和山脉所进行的对比试验结果表明:东亚地区的季风经圈环流对大气中的湿度场有很强的敏感性,且在120°E经度上这种敏感性比100°E上显著。积云对流过程的有无对于季风经圈环流的强弱有显著作用。山脉的存在对100°E上经圈季风环流的影响比对120°E上的影响显著,这可能意味着,这两个经度上的季风经圈环流的成因有显著的不同。 

A NUMERICAL EXPERIMENT ON MONSOON CIRCULATION CELL OVER EAST ASIA DURING SUMMER

The simulation of the monsoon circulation over East Asia was carried out by using a primitive equation model which includes various diabatic heating effects, frictional dispersion and moist processes with mountain. The results obtained coincide with the observations and show the existence of the two bands of precipitation.The several contrast experiments have been examined through decreasing moisture contrent in the atmosphere, eliminating cumulus convection and mountain effects .respectively. It is found that both the meridional monsoon circulation cells over 120°E and 100°E are very sensitive to the moisture fields.but the former is more sensitive than latter.The existence(nonexistence) of convectivecumulus process exhibits a significant effect on the enhancement (weakening)of the monsoon cells. The mountain shows stronger effects on the circulation over 100°E than over 120°E, which means that the causes of forming monsoon circulation are quite different between the two longitudes.