Fig. 1. Distributional characteristics of calibration values of each wavelength and every day

Fig. 2. Range distribution of calibration values of each wavelength

Fig. 3. Initial and screened result of calibration values in clear day under; (a) 500 nm and (b) 675 nm (The dotted purple and solid cyan lines denote upper-lower limit of the fitting and expectation method, respectively)

Fig. 4. Mean value (a) and standard deviation (b) of calibration values of each wavelength before and after data screening

Fig. 5. Diurnal variation types of AOD(500 nm). (a) Flat type, (b) ascending type, (c) descending type, (d) concave type, (e) convex type

Fig. 6. Frequency distribution of diurnal types of AOD

Fig. 7. Monthly (a) and seasonal mean values(b) , and frequencies (c) of AOD; Monthly (d) and seasonal mean values(e) , and frequencies (f) of AE