Dataset: ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the OCPR (UoL-PR) Proxy algorithm (CH4_GOS_OCPR), v7.0

Dataset: ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the OCPR (UoL-PR) Proxy algorithm (CH4_GOS_OCPR), v7.0#

Dataset identifier: esacci.GHG.satellite-orbit-frequency.L2.CH4.TANSO-FTS.GOSAT.OCPR.v7-0.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.GOSAT.OCPR.v7-0.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	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_quality_flag	xch4_quality_flag	1
ch4_profile_apriori	ch4_profile_apriori	1e-9
air_temperature_apriori	air_temperature_apriori	K
surface_air_pressure_apriori	surface_air_pressure_apriori	hPa
solar_zenith_angle	solar_zenith_angle	degree
pressure_levels	pressure_levels	hPa
co2_profile_apriori	co2_profile_apriori	1e-6
xch4_uncertainty	xch4_uncertainty	1e-9
gain	gain	1
xch4_averaging_kernel	xch4_averaging_kernel	1
raw_xco2	raw_xco2	1e-6
retr_flag	retr_flag	1
raw_xco2_error	raw_xco2_error	1e-6
xch4	xch4	1e-9
raw_xch4	raw_xch4	1e-9
surface_altitude_stdev	surface_altitude_stdev	m
sensor_zenith_angle	sensor_zenith_angle	degree
h2o_profile_apriori	h2o_profile_apriori	1e-6
model_xco2	model_xco2	1e-6
raw_xch4_error	raw_xch4_error	1e-9
model_xco2_median_diff	model_xco2_median_diff	1e-6
surface_air_pressure_apriori_std	surface_air_pressure_apriori_std	hPa
model_xco2_range	model_xco2_range	1e-6
surface_altitude	surface_altitude	m
xco2_averaging_kernel	xco2_averaging_kernel	1
pressure_weight	pressure_weight	1

Full variable metadata#

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	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	uint16
dimensions	n
file_dimensions	n

ch4_profile_apriori#

Field	Value
units	1e-9
short_description	A priori mole fraction profile of atmospheric CH4 in ppm.
long_name	ch4_profile_apriori
orig_data_type	float32
fill_value	None
size	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

air_temperature_apriori#

Field	Value
long_name	air_temperature_apriori
units	K
short_description	Air temperature is the bulk temperature of the air, not the surface (skin) temperature.
orig_data_type	float32
fill_value	None
size	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

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	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

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.
units	degree
long_name	solar_zenith_angle
standard_name	solar_zenith_angle
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

pressure_levels#

Field	Value
long_name	pressure_levels
units	hPa
short_description	Vertical altitude coordinate in pressure units as used for averaging kernels
orig_data_type	float32
fill_value	None
size	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 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	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

xch4_uncertainty#

Field	Value
long_name	xch4_uncertainty
units	1e-9
short_description	Statistical uncertainty of XCH4 in ppb (1-sigma).
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

gain#

Field	Value
_Unsigned	false
long_name	gain
units	1
short_description	GOSAT TANSO-FTS instrument gain mode. 0 indicates high gain. 1 indicates medium gain.
orig_data_type	uint8
fill_value	65535
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	uint16
dimensions	n
file_dimensions	n

xch4_averaging_kernel#

Field	Value
short_description	XCH4 averaging kernel (a profile = vector for each single observation). Quantifies the altitude sensitivity of the XCH4 retrieval.
units	1
long_name	xch4_averaging_kernel
orig_data_type	float32
fill_value	None
size	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

raw_xco2#

Field	Value
short_description	Retrieved column-averaged dry-air mole fraction of atmospheric carbon dioxide (XCO2) in ppm. No bias correction applied.
long_name	raw_xco2
units	1e-6
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

retr_flag#

Field	Value
_Unsigned	false
short_description	Retrieval type flag (0 = land, 1 = glint).
long_name	retr_flag
units	1
orig_data_type	uint8
fill_value	65535
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	uint16
dimensions	n
file_dimensions	n

raw_xco2_error#

Field	Value
long_name	raw_xco2_error
units	1e-6
short_description	Uncertainty on retrieved column-averaged dry-air mole fraction of atmospheric carbon dioxide (XCO2) in ppm. No bias correction applied.
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

xch4#

Field	Value
units	1e-9
short_description	Proxy retrieved column-averaged dry-air mole fraction of atmospheric methane (XCH4) in ppb.
long_name	xch4
standard_name	dry_atmosphere_mole_fraction_of_methane
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

raw_xch4#

Field	Value
long_name	raw_xch4
units	1e-9
short_description	Proxy retrieved column-averaged dry-air mole fraction of atmospheric methane (XCH4) in ppb. No bias correction applied.
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

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	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

sensor_zenith_angle#

Field	Value
long_name	sensor_zenith_angle
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.
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
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	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

model_xco2#

Field	Value
long_name	model_xco2
units	1e-6
short_description	model xco2 component of the final proxy data product
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

raw_xch4_error#

Field	Value
short_description	Uncertainty on proxy retrieved column-averaged dry-air mole fraction of atmospheric methane (XCH4) in ppb. No bias correction applied.
long_name	raw_xch4_error
units	1e-9
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

model_xco2_median_diff#

Field	Value
long_name	model_xco2_median_diff
units	1e-6
short_description	Maximum difference (in ppm) between model XCO2 ensemble members and ensemble median
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

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	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

model_xco2_range#

Field	Value
short_description	Maximum difference (in ppm) between model XCO2 from GEOS-Chem, CarbonTracker and LMDZ
long_name	model_xco2_range
units	1e-6
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

surface_altitude#

Field	Value
units	m
short_description	Altitude is the (geometric) height above the geoid, which is the reference geopotential surface.
long_name	surface_altitude
standard_name	surface_altitude
orig_data_type	float32
fill_value	None
size	1326
shape	1326
chunk_sizes	1326
file_chunk_sizes	1326
data_type	float32
dimensions	n
file_dimensions	n

xco2_averaging_kernel#

Field	Value
short_description	XCO2 averaging kernel (a profile = vector for each single observation). Quantifies the altitude sensitivity of the XCO2 retrieval.
long_name	xco2_averaging_kernel
units	1
orig_data_type	float32
fill_value	None
size	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

pressure_weight#

Field	Value
short_description	Pressure weights as used for averaging kernels
long_name	pressure_weight
units	1
orig_data_type	float32
fill_value	None
size	26520
shape	1326, 20
chunk_sizes	1326, 20
file_chunk_sizes	1326, 20
data_type	float32
dimensions	n, m
file_dimensions	n, m

Full dataset metadata#

Field	Value
title	ESA Greenhouse Gases Climate Change Initiative (GHG_cci): Column-averaged CH4 from GOSAT generated with the OCPR (UoL-PR) Proxy algorithm (CH4_GOS_OCPR), v7.0
source	GOSAT L1B version v161
references	http://www.esa-ghg-cci.org/ http://dx.doi.org/10.1029/2011GL047871
product_version	v7-0
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 Agenc outgrp.geospatial_lat_min = -90.0
ecv	GHG
institute	University of Leicester
processing_level	L2
product_string	OCPR
data_type	CH4
sensor_id	TANSO-FTS
platform_id	GOSAT
abstract	This CH4_GOS_OCPR dataset is comprised of level 2, column-averaged dry-air mole fractions (mixing ratios) of methane (XCH4.) 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), using the OCPR University of Leicester Proxy Retrieval Algorithm. It has been generated as part of the European Space Agency (ESA) Greenhouse Gases Climate Change Initiative (GHG_cci). This version of the data is v7.0 and forms part of the Climate Research Data Package 4. This algorithm has been designated the baseline algorithm for the GHG CCI proxy methane retrievals. A second product has also been generated from the TANSO-FTS data using an alternative algorithm, the RemoTeC Proxy algorithm. It is advised that users who aren't sure whether to use the baseline or alternative product use this product generated with the OCPR baseline algorithm. For more information regarding the differences between baseline and alternative algorithms please see the GHG-CCI data products webpage. The product is stored in NetCDF format with all GOSAT soundings on a single day stored in one file. For further details on the product, including the UoL-PR algorithm and the TANSO-FTS instrument, please see the associated product user guide (PUG) or the Algorithm Theoretical Basis Documents.
publication_date	2018-03-19T21:23:20
uuid	f9154243fd8744bdaf2a59c39033e659
catalog_url	https://catalogue.ceda.ac.uk/uuid/f9154243fd8744bdaf2a59c39033e659
cci_project	GHG