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Dataset

 

ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the SRFP (RemoTeC) Full Physics algorithm (CH4_GOS_SRFP), version 2.3.8

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2018-03-19
Download Stats: last 12 months

Abstract

The CH4_GOS_SRFP dataset is comprised of level 2, column-averaged mole fractiona (mixing ratioa) of methane (XCH4). It has been produced using data acquired from the Thermal and Near Infrared Sensor for Carbon Observations (TANSO-FTS) NIR and SWIR spectra onboard the Japanese Greenhouse gases Observing Satellite (GOSAT) using the SRFP (RemoTec) algorithm. It has been generated as part of the European Space Agency (ESA) Greenhouse Gases Climate Change Initiative (GHG_cci). This version of the dataset is v2.3.8 and forms part of the Climate Research Data Package 4.

The RemoTeC SRFP baseline algorithm is a Full Physics algorithm. The data product is stored per day in a single NetCDF file. Retrieval results are provided for the individual GOSAT spatial footprints, no averaging having been applied. The product file contains the key products with and without bias correction. Information relevant for the use of the data is also included in the data file, such as the vertical layering and averaging kernels. Additionally, the parameters retrieved simultaneously with XCH4 are included (e.g. surface albedo), as well as retrieval diagnostics like retrieval errors and the quality of the fit.

For further information on the product, including the RemoTeC Full Physics algorithm and the TANSO-FTS instrument please see the Product User Guide (PUG) or the Algorithm Theoretical Basis Document.

Citable as:  ESA CCI GHG project team (2018): ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the SRFP (RemoTeC) Full Physics algorithm (CH4_GOS_SRFP), version 2.3.8. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/46d136149d0a4f1cb8de7efbe8abf4b2
Abbreviation: Not defined
Keywords: ESA, GHG, CCI, FP, CH4

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 CCI GHG project team and supplied to CEDA as part of the ESA CCI Open Data Portal Project

File Format:
Data are in NetCDF format

Process overview

  • units: 1e-9
  • long_name: 1-sigma uncertainty of the retrieved column-average dry-air mole fraction of atmospheric methane
  • var_id: xch4_uncertainty
  • names: 1-sigma uncertainty of the retrieved column-average dry-air mole fraction of atmospheric methane
  • units: 1
  • long_name: Aerosol optical thickness per retrieval window
  • standard_name: optical_thickness_of_atmosphere_layer_due_to_ambient_aerosol
  • var_id: optical_thickness_of_atmosphere_layer_due_to_ambient_aerosol
  • names: optical_thickness_of_atmosphere_layer_due_to_ambient_aerosol, Aerosol optical thickness per retrieval window
  • units: K
  • standard_name: air_temperature
  • var_id: air_temperature
  • long_name: Air temperature at each level
  • names: air_temperature, Air temperature at each level
  • units: m
  • standard_name: altitude
  • var_id: altitude
  • long_name: Altitude
  • names: altitude, Altitude
  • units: 1
  • long_name: Chi-squared
  • var_id: chi2
  • names: Chi-squared
  • units: m-2
  • long_name: Dry airmass per layer
  • var_id: dry_airmass_layer
  • names: Dry airmass per layer
  • units: m-2
  • long_name: H2O total column
  • var_id: h2o_column
  • names: H2O total column
  • units: W cm-2
  • long_name: Intensity offset in the O2A-band
  • var_id: intensity_offset_o2a
  • names: Intensity offset in the O2A-band
  • units: 1
  • long_name: Level 1B name
  • var_id: l1b_name
  • names: Level 1B name
  • units: 1e-9
  • var_id: raw_xch4
  • long_name: Raw retrieved XCH4 column
  • names: Raw retrieved XCH4 column
  • units: 1e-9
  • long_name: Raw uncertainty on the XCH4 total column
  • var_id: raw_xch4_err
  • names: Raw uncertainty on the XCH4 total column
  • units: m
  • long_name: Retrieved aerosol peak height
  • var_id: aerosol_central_height
  • names: Retrieved aerosol peak height
  • units: m-2
  • long_name: Retrieved aerosol total column
  • var_id: aerosol_total_column
  • names: Retrieved aerosol total column
  • units: 1
  • long_name: Retrieved size parameter of the aerosol distribution
  • var_id: aerosol_size
  • names: Retrieved size parameter of the aerosol distribution
  • units: degrees
  • long_name: Sensor zenith angle
  • standard_name: sensor_zenith_angle
  • var_id: sensor_zenith_angle
  • names: Sensor zenith angle, sensor_zenith_angle
  • units: degrees
  • long_name: Solar zenith angle
  • var_id: solar_zenith_angle
  • standard_name: solar_zenith_angle
  • names: Solar zenith angle, solar_zenith_angle
  • units: m
  • long_name: Standard deviation of the surface elevation
  • var_id: surface_altitude_stdv
  • names: Standard deviation of the surface elevation
  • units: 1
  • long_name: Surface albedo at 1593 nm
  • var_id: surface_albedo_1593
  • names: Surface albedo at 1593 nm
  • units: 1
  • long_name: Surface albedo at 1629 nm
  • var_id: surface_albedo_1629
  • names: Surface albedo at 1629 nm
  • units: 1
  • long_name: Surface albedo at 2042 nm
  • var_id: surface_albedo_2042
  • names: Surface albedo at 2042 nm
  • units: 1
  • long_name: Surface albedo at 758 nm
  • var_id: surface_albedo_758
  • names: Surface albedo at 758 nm
  • units: 1e-9
  • long_name: a priori dry-air mole fraction profile of atmospheric methane
  • var_id: ch4_profile_apriori
  • names: a priori dry-air mole fraction profile of atmospheric methane
  • units: 1e-9
  • long_name: column-average dry-air mole fraction of atmospheric methane
  • var_id: xch4
  • standard_name: dry_atmosphere_mole_fraction_of_methane
  • names: column-average dry-air mole fraction of atmospheric methane, dry_atmosphere_mole_fraction_of_methane
  • units: 1
  • long_name: exposure id
  • var_id: exposure_id
  • names: exposure id
  • units: 1
  • long_name: flag for land / ocean soundings
  • var_id: flag_landtype
  • names: flag for land / ocean soundings
  • units: 1
  • long_name: flag for normal / sunglint soundings
  • var_id: flag_sunglint
  • names: flag for normal / sunglint soundings
  • units: 1
  • long_name: gain
  • var_id: gain
  • names: gain
  • units: m s-1
  • standard_name: x_wind
  • var_id: x_wind
  • long_name: grid_eastward_wind
  • names: x_wind, grid_eastward_wind
  • units: m s-1
  • standard_name: y_wind
  • var_id: y_wind
  • long_name: grid_northward_wind
  • names: y_wind, grid_northward_wind
  • units: 1
  • long_name: normalized column averaging kernel
  • var_id: xch4_averaging_kernel
  • names: normalized column averaging kernel
  • 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
  • units: 1
  • long_name: signal to noise ratio
  • var_id: signal_to_noise_window
  • names: signal to noise ratio
  • units: 1
  • long_name: xch4_quality flag
  • var_id: xch4_quality_flag
  • names: xch4_quality flag

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: latitude
  • long_name: latitude
  • names: latitude
  • units: degrees_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:
2009-03-31T23:00:00
End time:
2015-12-30T23:59:59
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°