多波段光度计遥感气溶胶误差分析及订正  

Error Analysis and Correction for Multi-Wavelength Sun-Photometer Aerosol Remote Sensing

作　　者：张军华[1] 王美华[1] 毛节泰[1] 

机构地区：[1]北京大学地球物理系暴雨监测和预测国家重点实验室,北京100871

出　　处：《大气科学》2000年第6期855-859,共5页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金!49635200

摘　　要：结合１９９８年实际遥感气溶胶所用多波段光度计，详细分析了由于仪器定标、仪 器视场角、滤光片宽度、气体吸收等方面带来的误差，并提出了相应的订正方法，特别是针 对水汽的吸收，提出了三波段差分吸收订正法。结果表明，通过误差订正，遥感精度有很大 提高，气溶胶光学厚度在０．１左右，相对误差不超过１０％，中等大气浑浊度情况下相对误差 ２％左右。Error analysis and correction is applied to a specific multi-wavelength sun-photometer, which is used for aerosol remote sensing at four locations in China. The results show that instrument calibration, filter bandwidth, gas absorption, etc. can bring serious errors. Several methods are used to correct these kinds of errors, especially a' three band method' is put forward to reduce the errors brought by water vapor. After the correction, it is shown that the relative error is no larger than 10% for very clear condition and is about 2% for medium turbidity.

关 键 词：光度计 大气光学厚度 气溶胶 遥感 误差 订正 

分 类 号：P402[天文地球—大气物理学与大气环境] P415.34[天文地球—大气科学及气象学]