Abstract
ABSTRACT Reducing temperature and water vapor estimation errors is indispensable for retrieving a CO 2 concentration profile or columnar amount from thermal infrared spectrum data because spectral radiance in the thermal infrared region is much more sensitive to temperature and water vapor concentration changes than it is to CO 2 concentration changes. This study presents a data analysis procedure to estimate the CO 2 columnar amount from the thermal infrared spectrum. The fi rst step retrieves the temperature vertical profile, water vapor vertical profile, and the surface temperature from spectra in the strong absorption bands of CO 2 and H 2 O. Then the spectral biases that are attributable to temperature and water vapor retrieval errors are reduced by comparing observed and synthesized radiances in the atmospheric window region. The final step estimates the CO 2 columnar amount from the corrected sp ectra of a weak absorption band of CO 2 that is located around 940 cm -1 .This method was applied to analysis of spectrum data from IMG sensor aboard the ADEOS satellite. Some preliminary results are shown. Keywords : Carbon dioxide, CO
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