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Preprints
https://doi.org/10.5194/essd-2020-123
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-123
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Jul 2020

07 Jul 2020

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A revised version of this preprint is currently under review for the journal ESSD.

Carbon Monitoring System Flux Net Biosphere Exchange 2020 (CMS-Flux NBE 2020)

Junjie Liu1,2, Latha Baskaran1, Kevin Bowman1, David Schimel1, A. Anthony Bloom1, Nicholas C. Parazoo1, Tomohiro Oda3,4, Dustin Carroll5, Dimitris Menemenlis1, Joanna Joiner3, Roisin Commane6, Bruce Daube7, Lucianna V. Gatii8, Kathryn McKain9,10, John Miller9, Britton B. Stephens11, Colm Sweeney9, and Steven Wofsy7 Junjie Liu et al.
  • 1Jet Propulsion Laboratory, Caltech, CA, USA
  • 2Caltech, CA, USA
  • 3Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 4Goddard Earth Sciences Technology and Research, Universities Space ResearchvAssociation, Columbia, MD, USA
  • 5Moss Landing Marine Laboratories, San José State University, California, CA, USA
  • 6Lamont-Doherty Earth Observatory of Columbia University, NY, USA
  • 7Harvard University, Cambridge, MA, USA
  • 8LaGEE, CCST, INPE-National Institute for Space Researc, Brazil
  • 9NOAA, Global Monitoring Laboratory, Boulder, CO 80305, USA
  • 10University of Colorado, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, USA
  • 11National Center for Atmospheric Research, Boulder, CO 80301, USA

Abstract. Here we present a global and regionally-resolved terrestrial net biosphere exchange (NBE) dataset with corresponding uncertainties between 2010–2018: CMS-Flux NBE 2020. It is estimated using the NASA Carbon Monitoring System Flux (CMS-Flux) top-down flux inversion system that assimilates column CO2 observations from Greenhouse gases Observing SATellite (GOSAT) and the NASA’s Observing Carbon Observatory-2 (OCO-2). The regional monthly fluxes are readily accessible as tabular files, and the gridded fluxes are available in NetCDF format. The fluxes and their uncertainty estimates are evaluated by extensively comparing the posterior CO2 mole fractions with aircraft CO2 observations. We describe the characteristics of the dataset as global total, regional climatological mean, and regional annual fluxes and seasonal cycles. We find that the global total fluxes of the dataset agree with atmospheric CO2 growth observed by the surface-observation network within uncertainty. Averaged between 2010 and 2018, the tropical regions range from close-to neutral in tropical South America to a net source in Africa; these contrast the extra-tropics, which are a net sink of 2.5 ± 0.3 gigaton carbon per year. The regional satellite-constrained NBE estimates provide a unique perspective for understanding the terrestrial biosphere carbon dynamics and monitoring changes in regional contributions to the changes of atmospheric CO2 growth rate. The gridded and regional aggregated dataset can be accessed at: https://doi.org/10.25966%2F4v02-c391 (Liu et al., 2020).

Junjie Liu et al.

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