Fig. 1. Aerosol extinction coefficient profiles. (a) Night; (b) day

Fig. 2. Diurnal variation of aerosol scale height

Fig. 3. Distribution of surface extinction coefficient

Fig. 4. Comparison of surface extinction coefficients from MPL and visibility

Fig. 5. Diurnal variation of AOD

Fig. 6. Day-night comparion of aerosol scale height (a) and AOD (b) in January 2020

Fig. 7. Relationship between aerosol scale height and relative humidity

Fig. 8. The relationship between AOD and visibility. (a) Day; (b) night; (c) all day