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
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#
Dataset identifier: esacci.GHG.satellite-orbit-frequency.L2.CH4.TANSO-FTS.GOSAT.SRFP.v2-3-8.r1 Data store: cciodp
Pressure levels define the boundaries of the averaging kernel and mole fraction profile layers. Surface pressure is represented by the 1st element, i.e., profiles are ordered from surface to top of atmosphere.
The normalized column-averaging kernel represents the sensitivity of the retrieved XCH4 to the atmospheric methane mole fraction depending on pressure (height). All values represent layer averages within the corresponding pressure levels. Values near one are ideal and indicate that the influence of the a priori is minimal. Profiles are ordered from surface to top of atmosphere.
a priori dry-air mole fraction profile of atmospheric methane
units
1e-9
comment
A priori dry-air mole fraction profile of atmospheric methane in ppb (http://www.atmos-meas-tech.net/5/1349/2012/amt-5-1349-2012.html). All values represent layer averages within the corresponding pressure levels. Profiles are ordered from surface to top of atmosphere.
The signal to noise ratio per retrieval window for both polarization directions. Window 1 ranges between 757 nm and 773 nm, Window 2 ranges between 1.59 um and 1.62 um, Window 3 ranges between 1.63 um and 1.65 um and Window 4 ranges between 2.04 um and 2.08 um
\"x\" indicates a vector component along the grid x-axis, positive with increasing x. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.)
\"y\" indicates a vector component along the grid y-axis, positive with increasing y. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.)
\"Layer\" means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is reduced by a factor exp(-optical_thickness) on traversing the path. A coordinate variable of radiation_wavelength or radiation_frequency can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. \"Aerosol\" means the suspended liquid or solid particles in air (except cloud droplets). \"Ambient aerosol\" is aerosol that has taken up ambient water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the aerosol. The specification of a physical process by the phrase due_to_process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. Window 1 ranges between 757 nm and 773 nm, window 2 ranges from 1.59 um and 1.62 um, window 3 ranges between 1.63 um and 1.65 um and window 4 ranges between 2.04 um and 2.08 um
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
source
GOSAT L1B version v201
history
30.08.2016 - product generated with RemoTeC v2.3.8
These data were produced at SRON Netherlands Institute for Space Research in the frame of the ESA GHG CCI project
project
Climate Change Initiative - European Space Agency
ecv
GHG
institute
Netherlands Institute for Space Research
processing_level
L2
product_string
SRFP
data_type
CH4
sensor_id
TANSO-FTS
platform_id
GOSAT
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.
