O4 斜柱浓度的准确获取,对气溶胶廓线反演具有重要意义。介绍了基于被动多轴差分吸收 光谱仪(MAX-DOAS)监测O4 斜柱浓度的误差修正方法,用于准确获取O4 斜柱浓度。通过 对比30°仰角O4 斜柱浓度MAX-DOAS测量结果和大气辐射传输模型模拟结果,获得修 正系数,利用修正系数修正各个角度的斜柱浓度值,消除O4 吸收截面不准确造成的反演结果 误差,提高了O4 斜柱浓度精度。研究方法应用于合肥地区O4 斜柱浓度的准确监测,为下一 步气溶胶廓线精确反演提供了数据支持。

Precise measurement of O4 slant column density(SCD) is meaningful for aerosol profile retrieval. Error correcting methods of O4 SCD measured with multi axis differential optical absorption spectroscopy(MAX-DOAS) is presented. Correcting factor is calculated by comparing O4 SCD measurement result of 30° and simulation result through radiative transfer model(RTM). This factor is used to correct SCDs of each elevation angle, to remove the retrieval error caused by O4 cross section absolute error and improve the SCDs precision. The result is applied to O4 SCD measurement at Hefei, and provides a possibility for aerosol profile retrieval of next step.