Dataset
ESA Greenhouse Gases Climate Change Initiative (GHG_cci): GOSAT CH4 Proxy Level 2 Data Product (CH4_GOS_SRPR), version 2.3.6, generated with the SRPR (RemoTeC) algorithm
Abstract
Part of the European Space Agency's (ESA) Greenhouse Gases (GHG) Climate Change Initiative (CCI) project and the Climate Research Data Package Number 2 (CRDP#2), the XCH4 GOS SRPR (Proxy) product comprises a level 2, column-averaged dry-air mole fraction (mixing ratio) for methane (CH4). The product 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).
This proxy version of the product has been generated using the RemoTeC SRPR algorithm, which is being jointly developed at SRON and KIT. This has been designated as an 'alternative' GHG CCI algorithm, and a separate product has also been generated by applying the baseline GHG CCI proxy algorithm (the University of Leicester OCPR algorithm). The link to this product's record page is provided in the documentation section. However, it is advised that users who aren't sure whether to use the baseline or alternative product use the OCPR product generated with the baseline algorithm. For more information regarding the differences between the baseline and alternative algorithms please see the GHG-CCI data products webpage.
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. As well as containing the key product, the product file contains information relevant for the use of the data, such as the vertical layering and averaging kernels. The parameters which are retrieved simultaneously with XCH4 are also included (e.g. surface albedo), in addition to retrieval diagnostics like quality of the fit and retrieval errors. For further details on the product, including the RemoTeC algorithm and the TANSO-FTS instrument, please see the associated product user guide (PUG) or the Algorithm Theoretical Basis Documents in the documentation section.
Details
| Previous Info: |
No news update for this record
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| Previously used record identifiers: |
No related previous 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: 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: |
The data are stored in Netcdf format which can be read with standard tools in the common
programming languages (IDL, Matlab, Python, Fortran90, C++, etc).
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Related Documents
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: 1e-6
- long_name: Apriori XCO2 model total column
- var_id: xco2_apriori
- names: Apriori XCO2 model total column
- 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 at 1593 nm
- var_id: h2o_column_1593
- names: H2O total column at 1593 nm
- units: m-2
- long_name: H2O total column at 1629 nm
- var_id: h2o_column_1629
- names: H2O total column at 1629 nm
- units: m-2
- long_name: H2O total column at 2042 nm
- var_id: h2o_column_2042
- names: H2O total column at 2042 nm
- 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
- long_name: Non-scattering retrieved XCH4 column
- var_id: xch4_nonscat
- names: Non-scattering retrieved XCH4 column
- units: 1e-6
- long_name: Non-scattering retrieved XCO2 column
- var_id: xco2_nonscat
- names: Non-scattering retrieved XCO2 column
- units: 1e-9
- long_name: Not bias-corrected XCH4 column
- var_id: xch4_no_bias_correction
- names: Not bias-corrected XCH4 column
- 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: height_stdev
- names: Standard deviation of the surface elevation
- units: 1e-9
- long_name: Statistical uncertainty on the XCH4 total column
- var_id: xch4_statistical_uncertainty
- names: Statistical uncertainty on the XCH4 total column
- units: 1e-6
- long_name: Statistical uncertainty on the XCO2 total column
- var_id: xco2_statistical_uncertainty
- names: Statistical uncertainty on the XCO2 total column
- 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-6
- long_name: a priori dry-air mole fraction profile of atmospheric carbon dioxide
- var_id: co2_profile_apriori
- names: a priori dry-air mole fraction profile of atmospheric carbon dioxide
- 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
- names: column-average dry-air mole fraction of atmospheric methane
- units: 1
- long_name: exposure id
- var_id: idexpo
- 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: xco2_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 weights
- var_id: pressure_weights
- names: pressure weights
- 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
Temporal Range
2009-01-01T00:00:00
2013-12-31T00:00:00
Geographic Extent
90.0000° |
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-180.0000° |
180.0000° |
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-90.0000° |