Zadvornykh I.   Gribanov K.   Zakharov V.   Imasu R.  

Methane retrieval from dual-band spectral measurements: method, software and comparative characterization

Reporter: Gribanov K.

Atmospheric vertical profile of main isotopologue of methane can be retrieved with better accuracy and vertical resolution if inversion method involves simultaneously satellite spectral measurements in thermal and near infrared spectral ranges, as measured by GOSAT [1]. We propose the method and software for joint retrieval of methane vertical profile from themal (TIR) and shortwave infrared (SWIR) spectral ranges of TANSO-FTS/GOSAT sensor [2]. Also we showed [3] that joint dual-band retrieval of methane vertical profile improves vertical resolution compared to single-band retrieval. In this paper we performed full characterization of joint retrieval in the frame of optimal estimation method [4]. Averaging kernels, a posteriory covariance matrices, degrees of freedom are analyzed.

The study was supported by Russian Science Foundation grant No.18-11-00024.

1. Greenhouse gases observing satellite GOSAT «IBUKI». About GOSAT. [Электрон. ресурс]. URL:
2. Zadvornykh I.V., Gribanov K.G., Zakharov V.I., Imasu R. Radiative Transfer Code for the Thermal and Near-Infrared Regions with Multiple Scattering // Atmospheric and Oceanic Optics. 2017. V. 30, № 4 .P. 305–310.
3. Zadvornykh I.V., Gribanov K.G., Zakharov V.I., Imasu R.The joint methane profiles retrieval  approach from GOSAT TIR and  SWIR spectra // Proc. of SPIE. 2017. doi: 10.1117/12.2288700.
4. Rodgers C. Inverse methods for atmospheric sounding: Theory and practice. World Scientific Publishing, Singapore, London, 2000.

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