21 February 2001 Development of radiative transfer model for GCOM-A1/ODUS
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Abstract
The accuracy of the scalar and vector versions of the STAR code is tested for the Rayleigh atmosphere. The scalar STAR is compared with MODTRAN4.0, however, the comparison revealed major discrepancies between the original STAR and MODTRAN4.0. After the solar irradiance data in STAR was modified and the wavenumber was used for solar irradiance calculation, the relative differences that appear like spikes in the spectral domain were greatly reduced. However, relative differences in the UV-B band are still a bit large (up to +/- 6%) and spikes remain. Examining these two codes, we found that the ozone cross section data used in STAR differs from that in MODTRAN4.0 due to a 15 cm-1 shift toward higher wavenumbers. Then relative differences between STAR and MODTRAN4.0 were reduced to 2% for wavelengths exceeding 310 nm. For wavelengths shorter than 310 nm, however, the differences increased as wavelengths decreased and reached 5.5% at 300 nm. This resulted from dividing by small radiances because of strong ozone absorption. Increasing the number of atmospheric layers from 36 to 50 in MODTRAN4.0 resulted in differences of less than 2% for wavelengths exceeding 306 nm and 4.5% at 300 nm. The vector STAR is compared with the tables from Coulson et al. (1960) and they are in very good agreement.
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Wenying Su, Wenying Su, Makoto Suzuki, Makoto Suzuki, Ryosuke Nakamura, Ryosuke Nakamura, Toshihiro Ogawa, Toshihiro Ogawa, "Development of radiative transfer model for GCOM-A1/ODUS", Proc. SPIE 4150, Optical Remote Sensing of the Atmosphere and Clouds II, (21 February 2001); doi: 10.1117/12.416948; https://doi.org/10.1117/12.416948
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