南京地区实际气溶胶对臭氧探测的影响

本文研究了在实测的南京地区五种气溶胶分布下,大气气溶胶对三波长差分吸收激光雷达(Dual-DIAL)臭氧探测结果的影响,使用波长对266nm,289nm,308nm进行了误差分析。通过对实际气溶胶的误差分析,模拟出在大部分高度上误差最小的C值(为消去后向散射及消光项误差引入的比值)C=1.7,并与传统方法取得的C=23/19进行了对比。讨论了气溶胶分布及含量对C值选取的影响及不同C值下误差随气溶胶变化的规律;分析得出对于本文所使用的气溶胶分布以及波长对,取C=1.7时在气溶胶较均匀时误差接近于零,误差不会大于5%,当气溶胶变化率变高且频繁变化时误差最大可达40%。取C=23/19时误差很稳定,不随气溶胶分布变化,误差高度增加误差减小且小于10%。本文还讨论了不同气溶胶分布下C的选取方法。

Effects on Ozone Observation Due to Aerosols in Nanjing

This paperstudiesthe effect of aerosol on the three-wavelength dual differential absorption lidar(Dual-DIAL)method with the presence of aerosols in Nanjing,the wavelength pair 266 nm,289 nm,308 nm is used for errors analysis.Based on the error analysis of the actual aerosol,the best value of C which minimizethe error is obtained as 1.7,and have been compared with the value derived by the traditional method.The influence of aerosol distribution and loading on the C are discussed,the variation of the errors with aerosol under different C is discussed,too.As the paper shows,1.7 and 23/19 are two suitable values of C,since the aerosol distribution homogeneously,C=1.7 enable the error under 5%,but increases soon when the aerosol change frequently,maximally reach to 40%.The errorscan be stable when 23/19 as a value of C,errors are not greater than 10%,and the errors decreases with the height.The value of C at different aerosol distribution is discussed.