Figure 3
Validation of AHI AOD aerosol retrievals with AERONET over coast from May 2016 to February 2019. (a–c) Density scatter plots of AHI AOD retrievals versus AERONET observations. (d–f) Box plots of AOD bias (AHI AOD-AERONET AOD) against AERONET observations. The blue dots, red center lines, and red boxes in the vertical of these panels indicate the means, medians, and 1 standard deviation of the AOD differences, respectively. The linear regression to mean biases (blue solid circles), i.e. expected accuracy (EA), are denoted by the blue line. Meanwhile, the linear regressions of the 1 standard deviation of the biases, i.e. the expected precision (EP), are denoted by the upper and lower limits of the red boxes. The two grey lines represent the expected error (EE) calculated by the formula of EA ± EP. (g–i) Mean percentage error of AHI AOD retrievals at each AERONET site. The validation results of different AHI L3 AOD datasets (AODmean, AODpure and AODmerged) are listed in columns 1, 2 and 3, respectively. The figure is generated by the software package M_Map39 (version 1.4 m; www.eoas.ubc.ca/~rich/map.html).
