EGU21-10193, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

An 11 year record of GOSAT XCO2 measurements from NASA's ACOS version 9 retrieval algorithms: comparisons to models, TCCON, and OCO-2

Thomas Taylor1, Christopher O'Dell1, Annmarie Eldering2, David Crisp2, Michael Gunson2, Brendan Fisher2, Robert Nelson2, Vivienne Payne2, Hannakaisa Lindqvist3, Kivi Rigel4, David Griffith5, Greg Osterman2, Debra Wunch6, and Akihiko Kuze7
Thomas Taylor et al.
  • 1Colorado State University, Cooperative Institute for Research in the Atmosphere, Fort Collins, United States of America (
  • 2Jet Propulsion Laboratory (JPL), California Institute of Technology, Pasadena, CA, 91109, USA.
  • 3Finnish Meteorological Institute (FMI), 00560 Helsinki, Finland
  • 4Finnish Meteorological Institute, 99600 Sodankylä, Finland
  • 5University of Wollongong, Centre for Atmospheric Chemistry, Australia
  • 6Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 7Japan Aerospace Exploration Agency (JAXA), Tskuba, Ibaraki, Japan

The GOSAT TANSO-FTS sensor has been collecting high spectral resolution measurements of reflected solar radiation in the Oxygen A-band (0.76 microns) and two shortwave-infrared carbon dioxide (CO2) absorption bands (1.6 and 2.0 microns) since April, 2009. The measured radiances allow for estimates of the total column carbon dioxide (XCO2) via retrieval inversion. An eleven year long record of XCOretrieved via NASA’s Atmospheric Carbon Observations from Space (ACOS) build 9 software suite is analyzed and discussed. The v9 XCOdata has been publicly available on the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) since the spring of 2020.

The ACOS GOSAT v9 XCO2  is evaluated against COflux inversion models, observations from the Total Carbon Column Observation Network (TCCON), as well as against collocated measurements from NASA’s OCO-2 satellite. The results indicate a product that agrees with OCO-2 and models within approximately 0.25 ppm with less than 1 ppm standard deviation (σ). Agreement with TCCON is within approximately 0.1 ppm with approximately 1 ppm σ for daily overpass mean aggregated data. The ACOS GOSAT v9 XCOproduct will allow COflux inversion modelers and terrestrial ecologists to address questions about long term (decadal) carbon cycle dynamics related to net and gross carbon fluxes.

How to cite: Taylor, T., O'Dell, C., Eldering, A., Crisp, D., Gunson, M., Fisher, B., Nelson, R., Payne, V., Lindqvist, H., Rigel, K., Griffith, D., Osterman, G., Wunch, D., and Kuze, A.: An 11 year record of GOSAT XCO2 measurements from NASA's ACOS version 9 retrieval algorithms: comparisons to models, TCCON, and OCO-2, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10193,, 2021.

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