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Progress in Earth and Planetary Science
Fig. 10 | Progress in Earth and Planetary Science

Fig. 10

From: Rapid, accurate computation of narrow-band sky radiance in the 940 nm gas absorption region using the correlated k-distribution method for sun-photometer observations

Fig. 10

The top row (a) shows time-series PWV from sky-radiometer (SKYR) observations derived using the SN-CKD (red) and WV-CKD-2 (blue) in 2019 at Chiba. The middle row (b) is the difference in PWV between the sky-radiometer and microwave radiometer. The bottom row (c) shows differences in AOT at 675 (red), 870 (blue), and 1020 (black) nm between the DSRAD algorithm and AERONET retrieval results. Circles and error bars in the middle and bottom rows represent means and standard deviations, respectively. SN-CKD is a standard lookup table for the CKD method in the radiative transfer model RSTAR, and WV-CKD-2 is a lookup table for the CKD method in the water vapor absorption region of 940 nm at 2-\({\mathrm{cm}}^{-1}\) intervals. DSRAD estimates AOT and PWV from the calibrated direct solar irradiance from sky-radiometer observations

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