17 October 2007 Carbon dioxide retrieval from reflected sunlight spectra in the presence of cirrus cloud: model studies
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The results of model study for CO2 retrievals from numerically synthesized GOSAT (Greenhouse gases Observing SATellite) observation data are presented. The GOSAT is scheduled to be launched in 2008 to monitor column amounts of CO2 and CH4. A nadir-looking Fourier-Transform Spectrometer (FTS) of Short Wavelength Infrared (SWIR, 1.6 μm and 2 μm) and 0.76 μm oxygen A-band regions will be mounted on GOSAT. To assess CO2 sources and sinks, the monthly averaged CO2 column amounts estimated by satellite-based measurements should have a precision of within 1% or better to provide an advantage over existing ground-based measurement networks. This study focuses on CO2 retrievals in the presence of cirrus clouds. An important feature of this problem is to apply radiance data measured in several spectral channels. In particular, 1.58 μm spectral band was utilized for CO2 total column amount retrievals. The cloud correction was performed using an original approach that is based on the application of the equivalence theorem with parameterization of photon path-length probability density function (PPDF). The PPDF parameters were estimated using nadir radiance in the oxygen A-band and in the H2O-saturated area of the 2.0 μm spectral band.
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Andrey Bril, Andrey Bril, Sergey Oshchepkov, Sergey Oshchepkov, Tatsuya Yokota, Tatsuya Yokota, } "Carbon dioxide retrieval from reflected sunlight spectra in the presence of cirrus cloud: model studies", Proc. SPIE 6745, Remote Sensing of Clouds and the Atmosphere XII, 674502 (17 October 2007); doi: 10.1117/12.737233; https://doi.org/10.1117/12.737233

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