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Journal Articles Remote Sensing Year : 2020

Bias Correction of the Ratio of Total Column CH4 to CO2 Retrieved from GOSAT Spectra

Haruki Oshio
Yukio Yoshida
Tsuneo Matsunaga
Nicholas Deutscher
Manvendra Dubey
  • Function : Author
David Griffith
  • Function : Author
Frank Hase
  • Function : Author
Laura Iraci
Rigel Kivi
Cheng Liu
  • Function : Author
Isamu Morino
Justus Notholt
  • Function : Author
Young-Suk Oh
Hirofumi Ohyama
Christof Petri
  • Function : Author
David Pollard
Coleen Roehl
  • Function : Author
Kei Shiomi
  • Function : Author
Ralf Sussmann
  • Function : Author
Voltaire Velazco
Thorsten Warneke
  • Function : Author
Debra Wunch


The proxy method, using the ratio of total column CH4 to CO2 to reduce the effects of common biases, has been used to retrieve column-averaged dry-air mole fraction of CH4 from satellite data. The present study characterizes the remaining scattering effects in the CH4/CO2 ratio component of the Greenhouse gases Observing SATellite (GOSAT) retrieval and uses them for bias correction. The variation of bias between the GOSAT and Total Carbon Column Observing Network (TCCON) ratio component with GOSAT data-derived variables was investigated. Then, it was revealed that the variability of the bias could be reduced by using four variables for the bias correction—namely, airmass, 2 μm band radiance normalized with its noise level, the ratio between the partial column-averaged dry-air mole fraction of CH4 for the lower atmosphere and that for the upper atmosphere, and the difference in surface albedo between the CH4 and CO2 bands. The ratio of partial column CH4 reduced the dependence of bias on the cloud fraction and the difference between hemispheres. In addition to the reduction of bias (from 0.43% to 0%), the precision (standard deviation of the difference between GOSAT and TCCON) was reduced from 0.61% to 0.55% by the correction. The bias and its temporal variation were reduced for each site: the mean and standard deviation of the mean bias for individual seasons were within 0.2% for most of the sites.
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hal-03958622 , version 1 (27-01-2023)


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Haruki Oshio, Yukio Yoshida, Tsuneo Matsunaga, Nicholas Deutscher, Manvendra Dubey, et al.. Bias Correction of the Ratio of Total Column CH4 to CO2 Retrieved from GOSAT Spectra. Remote Sensing, 2020, 12 (19), pp.3155. ⟨10.3390/rs12193155⟩. ⟨hal-03958622⟩
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