从宽带太阳直接辐射小时或日曝辐量反演气溶胶光学厚度研究

从宽带的太阳直接辐射1天或1小时累计量(曝辐量)气象观测资料反演气溶胶光学厚度的一个有效方法是很有用的.作者把太阳曝辐量与"等效"的瞬时太阳直接辐射关联起来,建立了一个与曝辐量"等效"的瞬时太阳直接辐射的模式;应用该模式和一个"等效"波长模式,发展了一个从太阳直接曝辐量反演气溶胶光学厚度的方法.作者还从试验上比较分析了由某时刻的宽带太阳直接辐射、每小时或1天的太阳直接辐射曝辐量反演得到的气溶胶光学厚度以及由太阳光度计探测的气溶胶光学厚度.试验结果表明,由日太阳直接辐射曝辐量反演得到的气溶胶光学厚度可理解为辐射加权的日平均光学厚度.

A Study of Retrieving Aerosol Optical Depth from Day-or Hour-Exposed Broadband Solar Direct Radiation

An available method to retrieve aerosol optical depth from day-or hour-exposed broadband solar direct radiation detected at meteorological observatory is of a great significance. In this paper, an "effective" instantaneous solar direct radiation, corresponding with the exposure radiation, is refined and then parameterized; and using the parameterization model and an "effective" wavelength model, a method to retrieve aerosol optical depth from the exposure radiation is proposed. Furthermore, aerosol optical depths retrieved from three kinds of radiation data, the instantaneous broadband solar direct radiation, the day- or hour-exposed broadband solar direct radiation and the sunphotometer measurement are comparatively analyzed. The results show that the aerosol optical depth from the day-exposed broadband solar direct radiation can be regarded as the day-averaged value of radiation-weighted aerosol optical depth.