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

  • Junjie Liu
  • , Latha Baskaran
  • , Kevin Bowman
  • , David Schimel
  • , A. Anthony Bloom
  • , C. Nicholas Parazoo
  • , Tomohiro Oda
  • , Dustin Carroll
  • , Dimitris Menemenlis
  • , Joanna Joiner
  • , Roisin Commane
  • , Bruce Daube
  • , V. Lucianna Gatti
  • , Kathryn McKain
  • , John Miller
  • , B. Britton Stephens
  • , Colm Sweeney
  • , Steven Wofsy

    Research output: Contribution to journalArticlepeer-review

    74 Scopus citations

    Abstract

    Here we present a global and regionally resolved terrestrial net biosphere exchange (NBE) dataset with corresponding uncertainties between 2010-2018: Carbon Monitoring System Flux Net Biosphere Exchange 2020 (CMS-Flux NBE 2020). It is estimated using the NASA Carbon Monitoring System Flux (CMS-Flux) top-down flux inversion system that assimilates column CO<span classCombining double low line"inline-formula">2</span> observations from the Greenhouse Gases Observing Satellite (GOSAT) and 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 uncertainties are evaluated by extensively comparing the posterior CO<span classCombining double low line"inline-formula">2</span> mole fractions with CO<span classCombining double low line"inline-formula">2</span> observations from aircraft and the NOAA marine boundary layer reference sites. We describe the characteristics of the dataset as the 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 CO<span classCombining double low line"inline-formula">2</span> 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 with the extra-tropics, which are a net sink of <span classCombining double low line"inline-formula">2.5±0.3</span> Gt C/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 CO<span classCombining double low line"inline-formula">2</span> growth rate. The gridded and regional aggregated dataset can be accessed at <a hrefCombining double low line"http://doi.org/10.25966/4v02-c391">http://doi.org/10.25966/4v02-c391</a> (Liu et al., 2020)..

    Original languageEnglish
    Pages (from-to)299-330
    Number of pages32
    JournalEarth System Science Data
    Volume13
    Issue number2
    DOIs
    StatePublished - Feb 10 2021

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