Dataset: ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged methane from GOSAT-2, generated with the SRPR (RemoTeC) proxy retrieval algorithm (CH4_GO2_SRPR), version 2.0.0#

Dataset identifier: esacci.GHG.satellite-orbit-frequency.L2.CH4.TANSO-FTS-2.GOSAT-2.SRPR.v2-0-0.r1
Data store: cciodp

How to open this dataset in AVL JupyterLab  

cciodp_store = new_data_store('cciodp')
ds = cciodp_store.open_data('esacci.GHG.satellite-orbit-frequency.L2.CH4.TANSO-FTS-2.GOSAT-2.SRPR.v2-0-0.r1')

Bounding box map#

Bounding box map
Map tiles and data from OpenStreetMap, under the ODbL.

Basic information#

Parameter Value
Bounding box longitude (°) -180.0 to 180.0
Bounding box latitude (°) -90.0 to 90.0
Time range 2019-02-05 to 2020-08-30

Click here for full dataset metadata.

Variable list#

Click on a variable name to jump to the variable’s full metadata.

Variable Long name Units
solar_zenith_angle solar zenith angle degrees
sensor_zenith_angle sensor zenith angle degrees
pressure_levels pressure_levels hPa
pressure_weight pressure weight 1
xch4_averaging_kernel normalized column averaging kernel 1
ch4_profile_apriori a priori dry-air mole fraction profile of atmospheric methane 1e-9
xch4_quality_flag xch4_quality flag 1
flag_landtype flag for land / ocean soundings 1
flag_sunglint flag for normal / sunglint soundings 1
exposure_id exposure id 1
signal_to_noise_window signal to noise ratio 1
dry_airmass_layer Dry airmass per layer m-2
altitude Altitude m
air_temperature Air temperature at each level K
surface_altitude_stdv Standard deviation of the surface elevation m
x_wind grid_eastward_wind m s-1
y_wind grid_northward_wind m s-1
chi2 Chi-squared [none]
optical_thickness_of_atmosphere_layer_due_to_ambient_aerosol Aerosol optical thickness per retrieval window [none]
h2o_column_1593 H2O total column at 1593 nm m-2
h2o_column_1629 H2O total column at 1629 nm m-2
h2o_column4_2042 H2O total column at 2042 nm m-2
surface_albedo_758 Surface albedo at 758 nm 1
surface_albedo_1593 Surface albedo at 1593 nm 1
surface_albedo_1629 Surface albedo at 1629 nm 1
surface_albedo_2042 Surface albedo at 2042 nm 1
intensity_offset_o2a Intensity offset in the O2A-band W cm-2
co2_profile_apriori a priori dry-air mole fraction profile of atmospheric carbondioxide 1e-6
xch4 column-average dry-air mole fraction of atmospheric methane 1e-9
xch4_no_bias_correction Not bias-corrected XCH4 column 1e-9
raw_xch4 Raw retrieved XCH4 column 1e-9
xch4_uncertainty 1-sigma uncertainty of the retrieved column-average dry-air mole fraction of atmospheric methane 1e-9
raw_xch4_err Raw uncertainty on the XCH4 total column 1e-9
xco2_apriori Apriori XCO2 total column 1e-6
xco2_averaging_kernel normalized column averaging kernel 1
raw_xco2 Raw retrieved XCO2 column 1e-6
raw_xco2_err Raw uncertainty on the XCO2 total column 1e-6

Full variable metadata#

solar_zenith_angle#

Field Value
long_name solar zenith angle
units degrees
comment Solar zenith angle is the angle between the line of sight to the sun and the local vertical.
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

sensor_zenith_angle#

Field Value
comment Sensor zenith angle is the angle between the line of sight to the sensor and the local vertical.
long_name sensor zenith angle
units degrees
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

pressure_levels#

Field Value
long_name pressure_levels
units hPa
comment 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.
orig_data_type float32
fill_value None
size 25905
shape 5181, 5
chunk_sizes 5181, 5
file_chunk_sizes 5181, 5
data_type float32
dimensions sounding_dim, level_dim
file_dimensions sounding_dim, level_dim

pressure_weight#

Field Value
long_name pressure weight
units 1
comment Pressure weights are the layer dependent weights needed to apply the averaging kernels.
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, layer_dim
file_dimensions sounding_dim, layer_dim

xch4_averaging_kernel#

Field Value
long_name normalized column averaging kernel
units 1
comment 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.
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, layer_dim
file_dimensions sounding_dim, layer_dim

ch4_profile_apriori#

Field Value
long_name 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.
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, layer_dim
file_dimensions sounding_dim, layer_dim

xch4_quality_flag#

Field Value
long_name xch4_quality flag
units 1
values 0, 1
meanings Quality flag for XCH4 retrieval
comment 0=good, 1=bad
orig_data_type int32
fill_value 9223372036854775807
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type int64
dimensions sounding_dim
file_dimensions sounding_dim

flag_landtype#

Field Value
long_name flag for land / ocean soundings
units 1
comment 0 = no glint, 1 = glint
orig_data_type int32
fill_value 9223372036854775807
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type int64
dimensions sounding_dim
file_dimensions sounding_dim

flag_sunglint#

Field Value
long_name flag for normal / sunglint soundings
units 1
comment 0 = no glint, 1 = glint
orig_data_type int32
fill_value 9223372036854775807
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type int64
dimensions sounding_dim
file_dimensions sounding_dim

exposure_id#

Field Value
long_name exposure id
units 1
comment Exposure identification number of the sounding
orig_data_type int32
fill_value 9223372036854775807
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type int64
dimensions sounding_dim
file_dimensions sounding_dim

signal_to_noise_window#

Field Value
long_name signal to noise ratio
units 1
comment 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
orig_data_type float32
fill_value None
size 41448
shape 5181, 2, 4
chunk_sizes 5181, 2, 4
file_chunk_sizes 5181, 2, 4
data_type float32
dimensions sounding_dim, polarization_dim, window_dim
file_dimensions sounding_dim, polarization_dim, window_dim

dry_airmass_layer#

Field Value
long_name Dry airmass per layer
units m-2
comment The dry airmass per layer, units are molecules m-2
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, layer_dim
file_dimensions sounding_dim, layer_dim

altitude#

Field Value
long_name Altitude
units m
comment Altitude is the surface elevation in meters
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

air_temperature#

Field Value
long_name Air temperature at each level
units K
comment
orig_data_type float32
fill_value None
size 25905
shape 5181, 5
chunk_sizes 5181, 5
file_chunk_sizes 5181, 5
data_type float32
dimensions sounding_dim, level_dim
file_dimensions sounding_dim, level_dim

surface_altitude_stdv#

Field Value
long_name Standard deviation of the surface elevation
units m
comment Standard deviation of the surface elevation within the area of the GOSAT-2 sounding, as derived from the SRTM database
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

x_wind#

Field Value
long_name grid_eastward_wind
units m s-1
comment '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.)
orig_data_type float32
fill_value None
size 25905
shape 5181, 5
chunk_sizes 5181, 5
file_chunk_sizes 5181, 5
data_type float32
dimensions sounding_dim, level_dim
file_dimensions sounding_dim, level_dim

y_wind#

Field Value
long_name grid_northward_wind
units m s-1
comment '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.)
orig_data_type float32
fill_value None
size 25905
shape 5181, 5
chunk_sizes 5181, 5
file_chunk_sizes 5181, 5
data_type float32
dimensions sounding_dim, level_dim
file_dimensions sounding_dim, level_dim

chi2#

Field Value
long_name Chi-squared
unit 1
comment Chi_squared value of the sounding
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

optical_thickness_of_atmosphere_layer_due_to_ambient_aerosol#

Field Value
long_name Aerosol optical thickness per retrieval window
unit 1
comment '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
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, window_dim
file_dimensions sounding_dim, window_dim

h2o_column_1593#

Field Value
long_name H2O total column at 1593 nm
units m-2
comment The retrieved H2O total column in units of molecules m-2 at 1593 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

h2o_column_1629#

Field Value
long_name H2O total column at 1629 nm
units m-2
comment The retrieved H2O total column in units of molecules m-2 at 1629 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

h2o_column4_2042#

Field Value
long_name H2O total column at 2042 nm
units m-2
comment The retrieved H2O total column in units of molecules m-2 at 2042 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

surface_albedo_758#

Field Value
long_name Surface albedo at 758 nm
units 1
comment The retrieved surface albedo for window 1, at 758 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

surface_albedo_1593#

Field Value
long_name Surface albedo at 1593 nm
units 1
comment The retrieved surface albedo for window 2, at 1593 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

surface_albedo_1629#

Field Value
long_name Surface albedo at 1629 nm
units 1
comment The retrieved surface albedo for window 3, at 1629 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

surface_albedo_2042#

Field Value
long_name Surface albedo at 2042 nm
units 1
comment The retrieved surface albedo for window 4, at 2042 nm
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

intensity_offset_o2a#

Field Value
long_name Intensity offset in the O2A-band
units W cm-2
comment The retrieved intensity offset in the O2A-band
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

co2_profile_apriori#

Field Value
long_name a priori dry-air mole fraction profile of atmospheric carbondioxide
units 1e-6
comment A priori dry-air mole fraction profile of atmospheric carbondioxide in ppm (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.
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, layer_dim
file_dimensions sounding_dim, layer_dim

xch4#

Field Value
long_name column-average dry-air mole fraction of atmospheric methane
units 1e-9
comment Retrieved column-average dry-air mole fraction of atmospheric methane (XCH4) in ppb
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

xch4_no_bias_correction#

Field Value
long_name Not bias-corrected XCH4 column
units 1e-9
comment The retrieved XCH4 total column before bias correction
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

raw_xch4#

Field Value
long_name Raw retrieved XCH4 column
units 1e-9
comments The retrieved raw XCH4 total column
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

xch4_uncertainty#

Field Value
long_name 1-sigma uncertainty of the retrieved column-average dry-air mole fraction of atmospheric methane
units 1e-9
comment 1-sigma uncertainty of the retrieved column-average dry-air mole fraction of atmospheric methane (XCH4) in ppb
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

raw_xch4_err#

Field Value
long_name Raw uncertainty on the XCH4 total column
units 1e-9
comment The raw uncertainty due to measurement noise on the XCH4 total column
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

xco2_apriori#

Field Value
long_name Apriori XCO2 total column
units 1e-6
comment The apriori XCO2 total column
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

xco2_averaging_kernel#

Field Value
long_name normalized column averaging kernel
units 1
comment The normalized column-averaging kernel represents the sensitivity of the retrieved XCO2 to the atmospheric carbondioxide 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.
orig_data_type float32
fill_value None
size 20724
shape 5181, 4
chunk_sizes 5181, 4
file_chunk_sizes 5181, 4
data_type float32
dimensions sounding_dim, layer_dim
file_dimensions sounding_dim, layer_dim

raw_xco2#

Field Value
long_name Raw retrieved XCO2 column
units 1e-6
comments The retrieved raw XCO2 total column
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

raw_xco2_err#

Field Value
long_name Raw uncertainty on the XCO2 total column
units 1e-6
comment The raw uncertainty due to measurement noise on the XCO2 total column
orig_data_type float32
fill_value None
size 5181
shape 5181
chunk_sizes 5181
file_chunk_sizes 5181
data_type float32
dimensions sounding_dim
file_dimensions sounding_dim

Full dataset metadata#

Field Value
title ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged methane from GOSAT-2, generated with the SRPR (RemoTeC) proxy retrieval algorithm (CH4_GO2_SRPR), version 2.0.0
source GOSAT2 L1B version v210
history 02.11.2022 - product generated with RemoTeC v2.0.0
references http://www.esa-ghg-cii.org/ http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50332/abstract http://onlinelibrary.wiley.com/doi/10.1029/2011GL047888/abstract
product_version v2-0-0
comment 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 SRPR
data_type CH4
sensor_id TANSO-FTS-2
platform_id GOSAT-2
abstract This dataset contains column-averaged dry-air mole fractions (mixing ratios) of methane (XCH4). It has been produced using data acquired from the Thermal and Near Infrared Sensor for Carbon Observations - Fourier Transform Spectrometer-2 (TANSO-FTS-2) Near Infrared (NIR) and Shortwave Infrared (SWIR) spectra, onboard the Japanese Greenhouse gases Observing Satellite (GOSAT-2), using the Remote Sensing of Greenhouse Gases for Carbon Cycle Modeling (RemoTeC) SRON Proxy (SRPR) retrieval algorithm. Results are provided for the individual GOSAT-2 spatial footprints. These data have been produced as part of the European Space Agency (ESA)'s Climate Change Initiative (CCI) programme.
publication_date 2023-02-14T10:08:00
uuid 6ecb706ac16c4e05aab75ed2cc3ec119
catalog_url https://catalogue.ceda.ac.uk/uuid/6ecb706ac16c4e05aab75ed2cc3ec119
cci_project GHG