Dataset
ESA Greenhouse Gases Climate Change Initiative (GHG_cci): GOSAT CH4 Full Physics Level 2 Data Product (CH4_GOS_SRFP), version 2.3.6, generated with the SRFP (RemoTeC) algorithm
Abstract
Created as part of The European Space Agency's (ESA) GHG CCI project, the XCH4 GOS Full Physics (FP) data product is a level 2, column-averaged mole fraction (mixing ratio) of methane (CH4). The product is part of Climate Research Data Package Number 2 (CRDP#2) and is based upon data generated for the years 2009-2013. 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). By contrast to the Proxy (PR) versions of the product generated with proxy algorithms, the record pages for which are provided in linked documentation, the FP products have been produced using full physics algorithms, in this case the RemoTeC SRFP baseline 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 in the documentation section.
The GHG-CCI team encourage all users of their products to register with them to receive information on any updates or issues regarding the data products and to receive notification of new product releases.
To register, please use the following link: http://www.iup.uni-bremen.de/sciamachy/NIR_NADIR_WFM_DOAS/CRDP_REG/
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(s): 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: 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
- long_name: Not bias-corrected XCH4 column
- var_id: xch4_no_bias_correction
- names: Not bias-corrected XCH4 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: 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: 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
- 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: 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 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° |