Abstract
Proper recovery of the depth and the shape of the carbon dioxide (CO2) absorption profile around 2 $\mu \text{m}$ on the solar radiance spectra of earth’s atmosphere calls for a correction due to water vapor (H2O) absorption at the adjacent wavelengths. This work proposes a method for such correction by comparison with the spectral radiance of Mars’ atmosphere where CO2 is the major component. It compares the radiance spectra derived from the images of the Airborne Visible Infrared Spectrometer—Next Generation (AVIRIS-NG) and Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) with the MODTRAN-simulated synthetic spectra and establishes that the truncation of CO2 absorption depth due to H2O absorption can be rectified by a proportionality constant. This method is easy and is expected to be suitable for all-purpose imaging spectrometers with medium spectral resolution.
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