Fig. 1. Structural design drawing of CDIAL system

Fig. 2. Flow chart of simulation of echo signal by CDIAL

Fig. 3. Simulation results of echo signal. (a) Aerosol backscattering coefficient; (b) standard atmospheric model; (c) CO₂ volume fraction profile; (d) simulated echo signal

Fig. 4. Variation of DAOD with drift of λon at different heights

Fig. 5. Variation of CO₂ molecular absorption cross section with wavelength

Fig. 6. RSE introduced by wavelength shift in DAOD at different altitudes

Fig. 7. Variation of DAOD with increasing temperature offset at different heights

Fig. 8. CO₂ molecular absorption cross section difference

Fig. 9. RSE of DAOD at different altitudes induced by temperature bias

Fig. 10. Variation of DAOD with increasing pressure offset at different heights

Fig. 11. RSE of DAOD at different altitudes induced by pressure bias

Fig. 12. SNR of echo output varies with height under different aerosol conditions

Fig. 13. Random error of CO₂ volume fraction varies with height under different aerosol conditions

Fig. 14. RSE of volume fraction inversion caused by wavelength drift

Fig. 15. RSE of volume fraction inversion caused by temperature uncertainty

Fig. 16. RSE of CO₂ molecular number density caused by temperature uncertainty

Fig. 17. RSE of volume fraction inversion caused by pressure uncertainty

Fig. 18. RSE of CO₂ molecular number density caused by pressure uncertainty

Fig. 19. RSE of CO₂ volume fraction caused by measurement deviation of water vapor volume mixing ratio