Improvement of the retrieval algorithm for GOSAT SWIR XCO <sub>2</sub> and XCH <sub>4</sub> and their validation using TCCON data

Yukio Yoshida(National Institute for Environmental Studies), N. Kikuchi(National Institute for Environmental Studies), Isamu Morino(National Institute for Environmental Studies), Osamu Uchino(National Institute for Environmental Studies), Sergey Oshchepkov(National Institute for Environmental Studies), Аndrey Bril(National Institute for Environmental Studies), Tazu Saeki(National Institute for Environmental Studies), Nick Schutgens(University of Oxford), Geoffrey C. Toon(Jet Propulsion Laboratory), Debra Wunch(California Institute of Technology), Coleen M. Roehl(California Institute of Technology), P. O. Wennberg(California Institute of Technology), David Griffith(University of Wollongong), Nicholas M. Deutscher(University of Bremen), Thorsten Warneke(University of Bremen), Justus Notholt(University of Bremen), John Robinson(National Institute of Water and Atmospheric Research), V. Sherlock(National Institute of Water and Atmospheric Research), B. J. Connor, Markus Rettinger(Karlsruhe Institute of Technology), Ralf Sussmann(Karlsruhe Institute of Technology), P. Ahonen(Finnish Meteorological Institute), Pauli Heikkinen(Finnish Meteorological Institute), E. Kyrö(Finnish Meteorological Institute), Joseph Mendonca(University of Toronto), Kimberly Strong(University of Toronto), Frank Hase(Karlsruhe Institute of Technology), S. Dohe(Karlsruhe Institute of Technology), Tatsuya Yokota(National Institute for Environmental Studies)
Atmospheric measurement techniques
June 7, 2013
10.5194/amt-6-1533-2013
Cited by 385Open Access
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Abstract

Abstract. The column-averaged dry-air mole fractions of carbon dioxide and methane (XCO2 and XCH4) have been retrieved from Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed (SWIR) observations and released as a SWIR L2 product from the National Institute for Environmental Studies (NIES). XCO2 and XCH4 retrieved using the version 01.xx retrieval algorithm showed large negative biases and standard deviations (−8.85 and 4.75 ppm for XCO2 and −20.4 and 18.9 ppb for XCH4, respectively) compared with data of the Total Carbon Column Observing Network (TCCON). Multiple reasons for these error characteristics (e.g., solar irradiance database, handling of aerosol scattering) are identified and corrected in a revised version of the retrieval algorithm (version 02.xx). The improved retrieval algorithm shows much smaller biases and standard deviations (−1.48 and 2.09 ppm for XCO2 and −5.9 and 12.6 ppb for XCH4, respectively) than the version 01.xx. Also, the number of post-screened measurements is increased, especially at northern mid- and high-latitudinal areas.

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