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Posterior South American monthly mean surface flux of methane (2010-2018) produced using the INVICAT 4D-Var inverse model.

Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2021-02-11
DOI Publication Date: 2021-02-17
Download Stats: last 12 months


This data set consist of a single file which contains a set of optimised global surface fluxes of methane (CH4), produced through variational inverse methods using the TOMCAT chemical transport model, and the INVICAT inverse transport model. These surface fluxes are produced as monthly mean values on the (approximately) 5.6-degree horizontal model grid. The associated uncertainty for the flux from each grid cell is also included. The fluxes and uncertainties are global and cover the period Jan 2010 - Dec 2018. The emissions from fossil fuels are labelled FF_FLUX, whilst the uncertainties are labelled FF_ERROR. The emissions from natural, agricultural and biomass burning sources are labelled NAT_FLUX, whilst the uncertainties are labelled NAT_ERROR. These two sectors (fossil fuel and non-fossil fuel) are solved for separately in the inversion. Flux and uncertainty units are kg(CH4)/m2/s, and time units are days since January 1st 2010. These emissions show improved performance relative to independent observations when included in the TOMCAT model. Further details about the data can be found in Wilson et al. (2020) in the documentation section.

Citable as:  Wilson, C.; Chipperfield, M.; Gloor, M.; Parker, R.; Boesch, H. (2021): Posterior South American monthly mean surface flux of methane (2010-2018) produced using the INVICAT 4D-Var inverse model.. Centre for Environmental Data Analysis, 17 February 2021. doi:10.5285/88224a922439441fa6644b4564dcd90c.
Abbreviation: Not defined
Keywords: CH4, Methane, Amazon, agriculture, biomass, TOMCAT, INVICAT


Previous Info:
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Previously used record identifiers:
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Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).

Data Quality:
Data checked by provider prior to archiving. Data passed CEDA quality control procedure, ceda-cc.
File Format:

Process overview

This dataset was generated by the computation detailed below.
Title Monthly mean surface flux methane produced using the INVICAT 4D-Var inverse model.
Abstract Emissions estimates were produced through assimilation of surface flask samples of methane produced by the National Oceanic and Atmospheric Administration’s Global Monitoring Division (NOAA GMD), and column-averaged dry-air mole fractions of CH4 (XCH4) from the University of Leicester Proxy retrieval scheme v7.2 for GOSAT (Parker et al., 2011, 2020). This data was produced using the INVICAT inverse chemical transport model at the University of Leeds, in 2020. For further information on the model please see the documentation section.
Input Description None
Output Description None
Software Reference None
  • units: degrees_north
  • var_id: LAT_EDGE
  • units: degrees_east
  • var_id: LON_EDGE
  • units: degrees_north
  • var_id: latitude
  • units: degrees_east
  • var_id: longitude
  • units: kg m-2 s-1
  • long_name: posterior_surface_flux_of_methane_from_fossil_fuel_emissions
  • var_id: FF_FLUX
  • names: posterior_surface_flux_of_methane_from_fossil_fuel_emissions
  • units: kg m-2 s-1
  • long_name: posterior_surface_flux_of_methane_from_natural_agriculture_fire_emissions
  • var_id: NAT_FLUX
  • names: posterior_surface_flux_of_methane_from_natural_agriculture_fire_emissions
  • units: kg m-2 s-1
  • long_name: posterior_surface_flux_uncertainty_for_methane_from_fossi_fuel_emissions
  • var_id: FF_ERROR
  • names: posterior_surface_flux_uncertainty_for_methane_from_fossi_fuel_emissions
  • units: kg m-2 s-1
  • long_name: posterior_surface_flux_uncertainty_for_methane_from_natural_agriculture_fire_emissions
  • var_id: NAT_ERROR
  • names: posterior_surface_flux_uncertainty_for_methane_from_natural_agriculture_fire_emissions
  • var_id: time

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