Dataset: ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the OCFP (UoL-FP) algorithm (CH4_GOS_OCFP), version 2.1

Dataset: ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the OCFP (UoL-FP) algorithm (CH4_GOS_OCFP), version 2.1#

Dataset identifier: esacci.GHG.satellite-orbit-frequency.L2.CH4.TANSO-FTS.GOSAT.OCFP.v2-1.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.GOSAT.OCFP.v2-1.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	2009-04-17 to 2015-12-31

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
xch4_averaging_kernel	xch4_averaging_kernel	1
surface_air_pressure_apriori_std	surface_air_pressure_apriori_std	hPa
pressure_weight	pressure_weight	1
xch4_uncertainty	xch4_uncertainty	1e-9
pressure_levels	pressure_levels	hPa
co2_profile_apriori	co2_profile_apriori	1e-6
solar_zenith_angle	solar_zenith_angle	degree
xch4_no_bias_correction	xch4_no_bias_correction	1e-9
surface_air_pressure_apriori	surface_air_pressure_apriori	hPa
surface_altitude	surface_altitude	m
air_temperature_apriori	air_temperature_apriori	K
gain	gain	1
h2o_profile_apriori	h2o_profile_apriori	1e-6
retr_flag	retr_flag	1
total_aod	total_aod	1
ch4_profile_apriori	ch4_profile_apriori	1e-9
surface_altitude_stdev	surface_altitude_stdev	m
xch4	xch4	1e-9
sensor_zenith_angle	sensor_zenith_angle	degree
cirrus	cirrus	1
xch4_quality_flag	xch4_quality_flag	1
aod_type1	aod_type1	1
aod_type2	aod_type2	1

Full variable metadata#

xch4_averaging_kernel#

Field	Value
long_name	xch4_averaging_kernel
units	1
short_description	XCH4 averaging kernel (a profile = vector for each single observation). Quantifies the altitude sensitivity of the XCH4 retrieval.
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

surface_air_pressure_apriori_std#

Field	Value
short_description	a priori surface pressure standard deviation
long_name	surface_air_pressure_apriori_std
units	hPa
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

pressure_weight#

Field	Value
long_name	pressure_weight
units	1
short_description	Pressure weights as used for averaging kernels
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

xch4_uncertainty#

Field	Value
units	1e-9
short_description	Statistical uncertainty of XCH4 in ppb (1-sigma).
long_name	xch4_uncertainty
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

pressure_levels#

Field	Value
short_description	Vertical altitude coordinate in pressure units as used for averaging kernels
long_name	pressure_levels
units	hPa
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

co2_profile_apriori#

Field	Value
long_name	co2_profile_apriori
units	1e-6
short_description	A priori mole fraction profile of atmospheric CO2 in ppm.
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

solar_zenith_angle#

Field	Value
short_description	Solar zenith angle is the the angle between the line of sight to the sun and the local vertical.
long_name	solar_zenith_angle
standard_name	solar_zenith_angle
units	degree
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

xch4_no_bias_correction#

Field	Value
short_description	Retrieved column-averaged dry-air mole fraction of atmospheric methane (XCH4) in ppb. No bias correction applied.
long_name	xch4_no_bias_correction
standard_name	dry_atmosphere_mole_fraction_of_methane
units	1e-9
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

surface_air_pressure_apriori#

Field	Value
long_name	surface_air_pressure_apriori
units	hPa
short_description	a priori surface pressure value
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

surface_altitude#

Field	Value
short_description	Altitude is the (geometric) height above the geoid, which is the reference geopotential surface.
long_name	surface_altitude
standard_name	surface_altitude
units	m
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

air_temperature_apriori#

Field	Value
short_description	Air temperature is the bulk temperature of the air, not the surface (skin) temperature.
units	K
long_name	air_temperature_apriori
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

gain#

Field	Value
_Unsigned	false
short_description	GOSAT TANSO-FTS instrument gain mode. 0 indicates high gain. 1 indicates medium gain.
units	1
long_name	gain
orig_data_type	uint8
fill_value	65535
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	uint16
dimensions	n
file_dimensions	n

h2o_profile_apriori#

Field	Value
short_description	A priori mole fraction profile of atmospheric H2O in ppm.
long_name	h2o_profile_apriori
units	1e-6
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

retr_flag#

Field	Value
_Unsigned	false
long_name	retr_flag
units	1
short_description	Retrieval type flag (0 = land, 1 = glint).
orig_data_type	uint8
fill_value	65535
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	uint16
dimensions	n
file_dimensions	n

total_aod#

Field	Value
short_description	Total aerosol and cirrus optical depth
long_name	total_aod
units	1
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

ch4_profile_apriori#

Field	Value
short_description	A priori mole fraction profile of atmospheric CH4 in ppb.
long_name	ch4_profile_apriori
units	1e-9
orig_data_type	float32
fill_value	None
size	15200
shape	760, 20
chunk_sizes	760, 20
file_chunk_sizes	760, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

surface_altitude_stdev#

Field	Value
long_name	surface_altitude_stdev
units	m
short_description	Standard deviation of the surface elevation within the area of the GOSAT sounding, as derived from the SRTM database.
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

xch4#

Field	Value
short_description	Retrieved column-averaged dry-air mole fraction of atmospheric methane (XCH4) in ppb. No bias correction applied.
units	1e-9
long_name	xch4
standard_name	dry_atmosphere_mole_fraction_of_methane
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

sensor_zenith_angle#

Field	Value
standard_name	sensor_zenith_angle
units	degree
short_description	Sensor zenith angle is the angle between the line of sight to the sensor and the local vertical.
long_name	sensor_zenith_angle
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

cirrus#

Field	Value
long_name	cirrus
units	1
short_description	Total cirrus optical depth
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

xch4_quality_flag#

Field	Value
_Unsigned	false
long_name	xch4_quality_flag
units	1
short_description	good_quality potentially_bad_quality: 0=good, 1=bad
orig_data_type	uint8
fill_value	65535
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	uint16
dimensions	n
file_dimensions	n

aod_type1#

Field	Value
long_name	aod_type1
units	1
short_description	Total aerosol optical depth for type 1
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

aod_type2#

Field	Value
long_name	aod_type2
units	1
short_description	Total aerosol optical depth for type 2
orig_data_type	float32
fill_value	None
size	760
shape	760
chunk_sizes	760
file_chunk_sizes	760
data_type	float32
dimensions	n
file_dimensions	n

Full dataset metadata#

Field	Value
title	ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the OCFP (UoL-FP) algorithm (CH4_GOS_OCFP), version 2.1
source	GOSAT L1B version v201
references	http://www.esa-ghg-cci.org/ http://dx.doi.org/10.1029/2011GL047871
product_version	v2-1
comment	These data were produced at the Univeristy of Leicester in the frame of the ESA GHG CCI project
project	Climate Change Initiative - European Space Agency
ecv	GHG
institute	University of Leicester
processing_level	L2
product_string	OCFP
data_type	CH4
sensor_id	TANSO-FTS
platform_id	GOSAT
abstract	The CH4_GOS_OCFP dataset is comprised of level 2, 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 (TANSO-FTS) NIR and SWIR spectra, onboard the Japanese Greenhouse gases Observing Satellite (GOSAT), using the University of Leicester Full-Physics Retrieval Algorithm. It has been generated as part of the European Space Agency (ESA) Greenhouse Gases Climate Change Initiative (GHG_cci) project. This version is version 2.1 and forms part of the Climate Research Data Package 4. The University of Leicester Full-Physics Retrieval Algorithm is based on the original Orbiting Carbon Observatory (OCO) Full Physics Retrieval Algorithm and has been modified for use on GOSAT spectra. A second GOSAT CH4 product, generated using the SRFP algorithm, is also available. The XCH4 product is stored in NetCDF format with all GOSAT soundings on a single day stored in one file. For further information, including details of the OCFP algorithm and the TANSO-FTS instrument, please see the associated product user guide (PUG).
publication_date	2018-03-19T21:28:51
uuid	56f81895cb094bd8a1638aa12d6c7499
catalog_url	https://catalogue.ceda.ac.uk/uuid/56f81895cb094bd8a1638aa12d6c7499
cci_project	GHG