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.
http://doi.org/10.2151/jmsj.2016-027 Graphical Abstract with 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.