Fig. 1. Flow chart for solving radiative transfer equation with SBDART model

Fig. 2. Absorption spectra of atmospheric molecules in visible light region. (a) Oxygen; (b) water vapor

Fig. 3. Transmittance of atmospheric molecules in visible light region in summer and winter at mid-latitude

Fig. 4. Extinction and scattering characteristics of four aerosol models versus particle radius. (a) Extinction efficiency factor; (b) scattering efficiency factor; (c) single scattering albedo; (d) asymmetric factor

Fig. 5. Relation between increment of aerosol extinction optical depth and height in mid-latitude summer atmospheric model

Fig. 6. Background radiation brightness distributions for different aerosol models. (a) Without aerosols; (b) rural aerosols; (c) urban aerosols; (d) oceanic aerosols

Fig. 7. Trends of solar direct radiation and atmospheric scattered radiation transfer varying with height under different aerosol models

Fig. 8. Comparison between phase function of Legendre matrix expansion and H-G phase function under different asymmetric factors. (a) 32-order; (b) 106-order

Fig. 9. Aerosol data obtained by Lidar detection retrieval. (a) Increment of aerosol extinction optical depth; (b) asymmetric factor

Fig. 10. Distributions of sky background radiation brightness at different heights. (a) 0 km;(b) 3 km;(c) 5 km;(d) 10 km

Fig. 11. Comparison of solar direct radiation at ground by Sun photometer and computational result obtained by SBDART model. (a) Trend comparison; (b) correlation analysis

Fig. 12. Trends of sky background radiation brightness and contrast versus height at different observation positions. (a) Sky background radiation brightness; (b) contrast