摘要
利用晴空无云条件下地面上实测的太阳直接辐射资料 ,用两种不同的方法反演了宽频上的气溶胶光学厚度 ,得到了比较一致的结果。从计算方法的比较分析来看 ,两种方法都是以全波段上的太阳辐射确定宽频上的气溶胶光学厚度为目的。方法I计算简单 ,但是其中所用的全波段太阳辐射衰减公式比较粗略 ;方法Ⅱ是确定一最优波长 ,并以此波长的气溶胶光学厚度作为宽频上的气溶胶光学厚度 ,在理论上较方法Ⅰ完善 ,得到的τa(λ0 )也可以得到更多的信息。总之 。
Two kinds of methods are used to calculate the aerosol optical depths of wide-band from the direct solar irradiation detected by pyrheliometer on the ground under the condition of cloud free sky. The results are obtained to be similar. The analyses of two methods show that the first method is conciser, while the equation used in it is curt, the second one is to definite the opximum wavelength, and the optical depth of the wavelength is regarded as the wide-band aerosol optical depth. So, the latter one is more precise on the theory, and more information can be obtained from the result. In a word, the latter is more resonable than the former.
出处
《高原气象》
CSCD
北大核心
2002年第1期79-84,共6页
Plateau Meteorology
基金
国家自然科学基金项目 ( 4 9875 0 5 7)资助
