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Dataset

 

ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged methane from Sentinel-5P, generated with the WFM-DOAS algorithm, version 1.2, November 2017 - July 2020

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2021-09-02
DOI Publication Date: 2021-09-08
Download Stats: last 12 months

Abstract

This product is the column-average dry-air mole fraction of atmospheric methane, denoted XCH4. It has been retrieved from radiance measurements from the TROPOspheric Monitoring Instrument (TROPOMI) on the Sentinel-5 Precursor satellite in the 2.3 µm spectral range of the solar spectral range, using the Weighting Function Modified Differential Optical Absorption Spectroscopy (WFM-DOAS or WFMD) retrieval algorithm. This dataset is also referred to as CH4_S5P_WFMD. This version of the product is version 1.2, and covers the period from November 2017 - July 2020.

The WFMD algorithm is based on iteratively fitting a simulated radiance spectrum to the measured spectrum using a least-squares method. The algorithm is very fast as it is based on a radiative transfer model based look-up table scheme. The product is limited to cloud-free scenes on the Earth's day side.

These data were produced as part of the European Space Agency's (ESA) Greenhouse Gases (GHG) Climate Change Initiative (CCI) project.

When citing this dataset, please also cite the following peer-reviewed publication:
Schneising, O., Buchwitz, M., Reuter, M., Bovensmann, H., Burrows, J. P., Borsdorff, T., Deutscher, N. M., Feist, D. G., Griffith, D. W. T., Hase, F., Hermans, C., Iraci, L. T., Kivi, R., Landgraf, J., Morino, I., Notholt, J., Petri, C., Pollard, D. F., Roche, S., Shiomi, K., Strong, K., Sussmann, R., Velazco, V. A., Warneke, T., and Wunch, D.: A scientific algorithm to simultaneously retrieve carbon monoxide and methane from TROPOMI onboard Sentinel-5 Precursor, Atmos. Meas. Tech., 12, 6771–6802, https://doi.org/10.5194/amt-12-6771-2019, 2019.

Citable as:  Schneising, O.; Buchwitz, M.; Reuter, M.; Bovensmann, H.; Burrows, J.P. (2021): ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged methane from Sentinel-5P, generated with the WFM-DOAS algorithm, version 1.2, November 2017 - July 2020. NERC EDS Centre for Environmental Data Analysis, 08 September 2021. doi:10.5285/1c9c816d0b8a4fbf878e7e0bfef5d79f. http://dx.doi.org/10.5285/1c9c816d0b8a4fbf878e7e0bfef5d79f
Abbreviation: Not defined
Keywords: ESA, CCI, satellite, Sentinel-5 Precursor, TROPOMI, atmosphere, methane, carbon monoxide

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
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: https://artefacts.ceda.ac.uk/licences/specific_licences/esacci_ghg_terms_and_conditions.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were processed by the ESA Climate Change Initiative (CCI) Greenhouse Gas project team and supplied to CEDA as part of the ESA CCI Open Data Portal.

Data Quality:
Data are as given by the data provider, no quality control has been performed by the Centre for Environmental Data Analysis (CEDA)
File Format:
Data are netCDF formatted.

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

TROPOspheric Monitoring Instrument (TROPOMI) Deployed on: Sentinel 5 Precursor

Computation Element: 1

Title Derivation of the CH4_S5P_WFMD product from the WFM-DOAS Retrieval algorithm
Abstract The Weighting Function Modified Differential Optical Absorption Spectroscopy (WFM-DOAS) algorithm is a least-squares retrieval method based on scaling (or shifting) pre-selected atmospheric vertical profiles. The column-averaged dry air mole fractions of methane (denoted XCH4) are derived from the vertical column amounts of methane by normalising with the dry air column, which is obtained from the European Centre for Medium-Range Weather Forecasts (ECMWF) analysis. The corresponding vertical columns of CH4 are retrieved from the measured sun-normalised radiance using spectral fitting windows in the SWIR spectral region (2311-2315.5 nm and 2320-2338 nm). For further details see the documentation section.
Input Description None
Output Description None
Software Reference None
Output Description None
  • units: 1e-9
  • long_name: 1-sigma uncertainty of the retrieved column-averaged dry air mole fraction of atmospheric carbon monoxide
  • var_id: xco_uncertainty
  • names: 1-sigma uncertainty of the retrieved column-averaged dry air mole fraction of atmospheric carbon monoxide
  • units: 1e-9
  • var_id: xch4_uncertainty
  • long_name: 1-sigma uncertainty of the retrieved column-averaged dry air mole fraction of atmospheric methane
  • names: 1-sigma uncertainty of the retrieved column-averaged dry air mole fraction of atmospheric methane
  • units: g cm-2
  • long_name: 1-sigma uncertainty of the retrieved vertical column of atmospheric water vapour
  • var_id: h2o_column_uncertainty
  • names: 1-sigma uncertainty of the retrieved vertical column of atmospheric water vapour
  • units: 1e-9
  • long_name: a priori dry air mole fraction profile of atmospheric carbon monoxide
  • var_id: co_profile_apriori
  • names: a priori dry air mole fraction profile of atmospheric carbon monoxide
  • units: 1e-9
  • var_id: ch4_profile_apriori
  • long_name: a priori dry air mole fraction profile of atmospheric methane
  • names: a priori dry air mole fraction profile of atmospheric methane
  • units: 1
  • long_name: across track dimension index
  • var_id: ground_pixel
  • names: across track dimension index
  • units: 1
  • long_name: along track dimension index
  • var_id: scanline
  • names: along track dimension index
  • units: m
  • standard_name: altitude
  • var_id: altitude
  • long_name: altitude
  • names: altitude
  • units: 1
  • long_name: apparent surface albedo
  • var_id: apparent_albedo
  • names: apparent surface albedo
  • units: degree
  • long_name: azimuth difference
  • var_id: azimuth_difference
  • names: azimuth difference
  • units: 1
  • long_name: cloud parameter from strong water vapour absorption
  • var_id: cloud_parameter
  • names: cloud parameter from strong water vapour absorption
  • units: 1e-9
  • long_name: column-averaged dry air mole fraction of atmospheric carbon monoxide
  • var_id: xco
  • names: column-averaged dry air mole fraction of atmospheric carbon monoxide
  • units: 1e-9
  • var_id: xch4
  • long_name: column-averaged dry air mole fraction of atmospheric methane
  • standard_name: dry_atmosphere_mole_fraction_of_methane
  • names: column-averaged dry air mole fraction of atmospheric methane, dry_atmosphere_mole_fraction_of_methane
  • units: 1e-2
  • long_name: land fraction
  • var_id: land_fraction
  • names: land fraction
  • units: degree_north
  • var_id: latitude_corners
  • long_name: latitude_corners
  • names: latitude_corners
  • units: degree_east
  • var_id: longitude_corners
  • long_name: longitude_corners
  • names: longitude_corners
  • units: 1
  • long_name: orbit number
  • var_id: orbit_number
  • names: orbit number
  • units: hPa
  • long_name: pressure levels
  • var_id: pressure_levels
  • names: pressure levels
  • units: 1
  • long_name: pressure weight
  • var_id: pressure_weight
  • names: pressure weight
  • long_name: quality flag
  • var_id: quality_flag
  • names: quality flag
  • units: degree
  • standard_name: sensor_zenith_angle
  • var_id: sensor_zenith_angle
  • long_name: sensor_zenith_angle
  • names: sensor_zenith_angle, sensor zenith angle
  • units: degree
  • var_id: solar_zenith_angle
  • standard_name: solar_zenith_angle
  • long_name: solar_zenith_angle
  • names: solar zenith angle, solar_zenith_angle
  • var_id: h2o_column
  • units: g cm-2
  • long_name: vertical column of water vapour
  • names: vertical column of water vapour
  • units: 1
  • var_id: xch4_averaging_kernel
  • long_name: xch4 averaging kernel
  • names: xch4 averaging kernel
  • units: 1
  • long_name: xco averaging kernel
  • var_id: xco_averaging_kernel
  • names: xco averaging kernel

Co-ordinate Variables

  • units: degree_north
  • standard_name: latitude
  • var_id: latitude
  • long_name: latitude
  • names: latitude
  • units: degree_east
  • standard_name: longitude
  • var_id: longitude
  • long_name: longitude
  • names: longitude
  • long_name: time
  • standard_name: time
  • var_id: time
  • names: time
Coverage
Temporal Range
Start time:
2017-11-10T00:00:00
End time:
2020-07-31T23:59:59
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°