Graphical Abstract

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Ota, Y., and R. Imasu, 2016: CO₂ Retrieval using thermal infrared radiation observation by Interferometric Monitor for Greenhouse Gases (IMG) onboard Advanced Earth Observing Satellite (ADEOS). J. Meteor. Soc. Japan, 94, 471-490.
https://doi.org/10.2151/jmsj.2016-027   Graphical Abstract with highlights

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Highlights:

• CO₂ concentrations in the upper troposphere were retrieved from thermal infrared spectra as observed by the only spaceborne hyperspectral sounder launched in the 1990s: the Interferometric Monitor for Greenhouse gases (IMG) onboard the Advanced Earth Observing Satellite (ADEOS).
• The effective optical path difference (EOPD) of IMG was evaluated in order to optimize the actual instrumental line shape function of IMG in orbit.
• CO₂ retrieval method was based on maximum a posteriori (MAP) retrieval method and on a priori temperature field of ERA-40 re-analysis meteorological data. CO₂ retrieval noises of the MAP retrieval were estimated respectively as 2.5% and 2.0% at pressure levels of 500 hPa and 300 hPa.
• The CO₂ retrieval method was applied to IMG data measured in April, 1997. Although assuming uniform CO₂ concentration as a priori, the results showed that latitudinal gradient of zonal mean concentration was consistent with climatological features presented by previous studies at pressure levels of 500 hPa and 300 hPa.