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

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.