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Post-flight radiometric calibration of the Korean geostationary satellite COMS meteorological imager |
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| Authors: | Bo-Ra Kim Seung-Hee Ham Dohyeong Kim Byung-Ju Sohn |
| Institution: | 1. School of Earth and Environmental Science Seoul National University, Seoul, Korea 2. NASA Langley Research Center, Hampton, Virginia, USA 3. National Meteorological Satellite Center/KMA, Jincheon, Korea 4. School of Earth and Environmental Sciences, Seoul National University, 1 Gwanak-ro, Gwanakgu, Seoul, 151-747, Korea |
| Abstract: | The first Korean geostationary satellite, the Communication, Ocean, Meteorological Satellite (COMS) carries the Meteorological Imager (MI) that measures solar radiance at 0.675 μm and infrared (IR) brightness temperatures at four spectral bands centered at 3.8, 6.7, 10.8, and 12.0 μm. This study reports the calibration status of the COMS MI solar and four IR channels, based mainly on a comparison with Moderate Resolution Imaging Spectroradiometer (MODIS) measurements. The results obtained from four months of COMS MI solar channel measurements demonstrate that the solar channel has a dark bias of about 9–10%. On the other hand, the four IR channels appear to be well-calibrated as evidenced by a high correlation and near-unity slope between COMS and MODIS data. Nevertheless, existing biases of tenths of a kelvin are still considered to be substantial. Overall, the interpretation of COMS-derived meteorological products should take into account some uncertainty caused by possible calibration errors. |
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