Research on DOAS algorithm based on discrete wavelength
NO2 slant column density is retrieved using eight discrete wavelengths(DW)combined with differential optical absorption spectroscopy(DOAS)technique,and the difference between DW-DOAS and the traditional DOAS technique using continuous wavelengths is compared and discussed.The feasibility of DW-DOAS is validated using the ground-based data and the satellite-based data from environmental trace gases monitoring instrument(EMI)in the study.The results show that compared with the traditional DOAS,the average errors of the two data retrieved using DW-DOAS are both less than 7％,and the correlations are above 0.9,proving that the DW-DOAS retrieve method has certain application value in retrieving trace gas column density.In addition,it is also shown that the DW-DOAS algorithm can quickly and efficiently retrieve the NO2 slant column density only using a small amount of spectral information.This work not only provides a basis for further research on subsequent algorithms,but also indicates that based on DW-DOAS algorithm,simpler and more efficient instruments can be designed for monitoring NO2 with high spatial and temporal resolution.
万方数据
维普
