地基多波段遥感西藏当雄地区气溶胶光学特性

Remote Sensing of Aerosol Optical Properties with Multi-Spectral Sun Photometer in the Damxung Region, Tibetan Plateau

根据 1 998年 5、 6月份在西藏当雄地区进行的为期两个月的气溶胶地面多波段观测结果 ,讨论了仪器的定标、气溶胶光学特性及其变化规律 ,并反演了粒子谱分布。结果表明 ,当雄地区气溶胶光学厚度较小 ,光学厚度与大气相对湿度呈正相关。干季气溶胶光学厚度日变化大 ,光学厚度最小值出现在中午前后 ,而湿季日变化相对要小 ,光学厚度也小于干季。反演的粒子谱符合干洁大陆气溶胶的特性。

Results of Aerosol Optical Depth (AOD) measurements for the Damxung region, the Tibetan Plateau are presented. The measurements were performed with a multi-spectral photometer in the wavelength range 448.2～902.3 nm during May/June of 1998. The AOD was found to be very low (≤0.1) and had a good positive correlation with relative moisture. They exhibit larger diurnal as well as day-to-day variations at all wavelengths in dry seasons than in wet seasons. Also a general decreasing trend was seen in the AOD from May to June. Using Monte-Carlo method, we have obtained the aerosol size distributions which are very similar to those in clean continent.