我国东部亚热带地区地面净辐射的分布

DISTRIBUTION OF SURFACE NET RADIATION OVER THE SUBTROPICAL REGION IN EASTERN CHINA

本文根据作者提出的辐射平衡各分量的气候学计算方法,计算并讨论了我国东部亚热带地区净辐射分布状况。指出:影响本区辐射场的主要因素是大气环流和地形条件,地理纬度的作用仅在冬季表现较明显。净辐射分布的总特点是平原大于山丘;东部大于西部。净辐射年变化曲线中最大值的出现月份与雨季有很大关系。

The calculation method of the radiation balance of earth surface is discussed in detail. The global radiation is calculated with an expression which is similar to that of Angstrom and the effective radiation could be expressed as (?)=δσ[T_0~4-T^4(1.035-0.295e^(-0.166w∞)](1-0.54e^(0.02z^2)·n)0.965e^(0.18z) in which, T_0, T, W_∞, n, and z are the surface temperature, air temperature, water vapour content in an air column, the total cloudiness and the elevation above sea level, respectively. Surface albedo, refering to the vegetation situation, is determined by means of measurements, and net radiation is calculated as the residual term in the equation of surface radiation balance. The calculation error of global, effective and surface net radiation are 2.7, 9.4 and 8.9%, respectively. In terms of these methods the distribution pattern of net radiation over the subtropical area in the Eastern China is prepared. The results show that the major influential factors are the atmospheric circulation pattern and topographic features, and geographical latitude have stronger effection in wintertime only. The distribution of net radiation in plains (eastern part) is higher than that in hilly countries (western part). The peaks of the annual variation curve of net radiation occur in close relation to rainy seasons.