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Attribute Name	Value	Examples	Comment
Conventions	CF_convention_string C3S-0.1 [Other convention] :...	"CF-1.6 C3S-0.1"	Multiple conventions may be included (separated by blank spaces)
title	"<short institution name> seasonal forecast model output prepared for C3S" CF: Free text ACDD (highly recommended)	"ECMWF seasonal forecast model output prepared for C3S"	A short phrase or sentence describing the dataset. In many discovery systems, the title will be displayed in the results list from a search, and therefore should be human readable and reasonable to display in a list of such names <short institution name> is the first element of the comma-separated list of values of the corresponding "institution" attribute
references	URIs (such as a URL or DOI) for papers or other references. A valid doi is recommended CF: Free text	"doi:10.5194/gmd-8-1509-2015"	Published or web-based references that describe the data or methods used to produce it.
source	A methodology to build this attribute will be provided	"world model v.0.1" "model-generated, GloSea5-GC2" "IPSL-CM5A-LR (2010) : atmos : LMDZ4 (LMDZ4_v5, 96x95x39); ocean : ORCA2 (NEMOV2_3, 2x2L31); seaIce : LIM2 (NEMOV2_3); ocnBgchem : PISCES (NEMOV2_3); land : ORCHIDEE (orchidee_1_9_4_AR5)"	The method of production of the original data. If it was model-generated, source should name the model and its version, as specifically as it could be useful
institute_id	Controlled Vocabulary: "ecmf" for ECMWF "egrr" for Met Office "lfpw" for Météo-France "edzw" for DWD "cmcc" for CMCC	"edzw"	Standardized 4 characters identifier of the institution that produced the data; NOTE all the values come from abbreviations of WMO/GRIB "originating centre" table, except CMCC (not available there)
The following template should be followed in constructing this string: '<model_id> : atmosphere: <model_name> (<technical_name>, <resolution_and_levels>); ocean: <model_name> (<technical_name>, <resolution_and_levels>); sea ice: <model_name> (<technical_name>); land: <model_name> (<technical_name>)'' Additional explanatory information may follow the required information. NOTE that for some models, it may not make much sense to include all these components. The first portion of the string, “model_id”, should be built using the following template: "model_name_vYYYYMMDD" where YYYYMMDD is the release date of that version of the model (the date when it was first used)		The method of production of the original data. If it was model-generated, source should name the model and its version, as specifically as it could be useful. It is a character string fully identifying the model and version used to generate the output. It should include information concerning the component models. Note that information about changes in the individual components respect to the "official" releases should be included (e.g. a different bathymetry) The "source" attribute should include as much information as possible to not just identify the model but to brief the user about it
institute_id	Controlled Vocabulary: "ecmf" for ECMWF "egrr" for Met Office "lfpw" for Météo-France "edzw" for DWD "cmcc" for CMCC	"edzw"	Standardized 4 characters identifier of the institution that produced the data; NOTE all the values come from abbreviations of WMO/GRIB "originating centre" table, except CMCC (not available there)
institution	Controlled Vocabulary: "ECMWF, European Centre for Medium-	institution	Controlled Vocabulary: "ECMWF, European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom" "Met Office, Exeter, United Kingdom" "Météo-France, Toulouse, France" "DWD, Deutscher Wetterdienst, Offenbach, Germany" "CMCC, Centro Euro-Mediterraneo sui Cambiamenti Climatici, Bologna, Italy" CF: Free text	"Météo-France, Toulouse, France"	Specifies where the original data was produced. The name of the institution principally responsible for originating this data. NOTE: The first element of the comma-separated list of values will be used as a shortened version of this attribute in some of the other global attributes ('summary', 'title')
contact	Copernicus User Support URI should be used http://copernicus-support.ecmwf.int CF: Free text	"http://copernicus-support.ecmwf.int"
project	"C3S Seasonal Forecast" should be used CF: Free text	"C3S Seasonal Forecast"
creation_date	SPECS: YYYY-MM-DDThh:mm:ss<zone> ISO 8601:2004 extended format	"2011-06-24T02:53:46Z"	The date on which this version of the data was created. Modification of values implies a new version, hence this would be assigned the date of the most recent values modification. Metadata changes are not considered when assigning the creation_date NOTE: The ACDD 1.3 names this attribute as "date_create". The name "creation_date" has been used following SPECS convention.
comment	Free text	"Produced by University of Hamburg for DWD at ECMWF HPC facilities" "Run by CMCC at CINECA"	Miscellaneous information about the data, not captured elsewhere.
forecast_type	Controlled Vocabulary "forecast" or "hindcast"	"forecast"	To identify the type of data
modeling_realm	Controlled Vocabullary "atmos", "ocean", "land", "landIce", "seaIce", "aerosol", "atmosChem", "ocnBgchem"	"seaIce"	A string that indicates the high-level modelling component that is particularly relevant to the variable encoded Controlled vocabulary taken from SPECS
frequency	Controlled Vocabulary "mon", "day", "12hr", "6hr", "fix"	"day"	A string indicating the interval between individual time-samples. Controlled vocabulary taken from SPECS (extended to include "12hr" data)
level_type	Controlled Vocabulary "surface", "pressure", "soil"	"pressure"	A string indicating the type of the level where the variable comes from
history	Each line should begin with a timestamp indicating the date and time of day when the program was executed CF: Free Text	"Produced using CDS Toolbox on 1/6/2016" "Model raw output postprocessing with modelling environment (IMDI) at DKRZ: URL: http://svn-mad.zmaw.de/svn/mad/Model/IMDI/trunk, REV: 3436 2011-07-17T15:14:45Z CMOR rewrote data to comply with CF standards and CMIP5 requirements."	To record relevant information, such as the command history which led to this file being produced. Provides an audit trail for modifications to the original data. Well-behaved generic netCDF filters will automatically append their name and the parameters with which they were invoked to the global history attribute of an input netCDF file
commit, iso_lineage or lineage	Free text (ISO Lineage model 19115-2)	"Produced using CDS Toolbox v1.0"	Trace of the tools/scripts used. Either this attribute or the "history" attribute needs to include information about the versioning of the software used to create the data. This is related with some of the EQC activities (WP4 of QA4SEAS). ISO 19115-2 defines a linage model where this is been considered.
summary	Controlled Vocabulary: "Seasonal Forecast data produced by <short institution name> as its contribution to the seasonal forecast activity of the Copernicus Climate Change Service (C3S). The data has global coverage with a 1-degree horizontal resolution and spans for around 6 months since the start date" ACDD (highly recommended)	"Seasonal Forecast data produced by DWD as its contribution to the seasonal forecast activity of the Copernicus Climate Change Service (C3S). The data has global coverage with a 1-degree horizontal resolution and spans for around 6 months since the start date"	A short paragraph describing the dataset <short institution name> is the first element of the comma-separated list of values of the corresponding "institution" attribute
keywords	Fixed string "Seasonal Forecasts, C3S, ECMWF, Copernicus, Climate Change, Climate Services, Earth Science Services, Environmental Advisories, Climate Advisories" ACDD (highly recommended)		A comma separated list of key words and phrases. NOTE: This attribute is likely to be modified in the future, once the contents of the Thesaurus for CDS faceting will be defined
forecast_reference_time	SPECS: YYYY-MM-DDThh:mm:ssZ NOTE: This is ISO 8601:2004 extended format, but time zone is required to be UTC	"2011-06-01T00:00:00Z"	time of the analysis from which the forecast was made Introduced as global attribute to keep compatibility with SPECS (note that works fine for SPECS data structure, i.e. one variable per start time per file)

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Info

To represent cells we add the attribute bounds to the appropriate coordinate variable(s). The value of bounds is the name of the variable that contains the vertices of the cell boundaries. We refer to this type of variable as a "boundary variable." A boundary variable will have one more dimension than its associated coordinate or auxiliary coordinate variable. The additional dimension should be the most rapidly varying one, and its size is the maximum number of cell vertices. Since a boundary variable is considered to be part of a coordinate variable’s metadata, it is not necessary to provide it with attributes such as long_name and units

...

Values (1x1deg grid) prescribed:

[0., 1.], [1., 2.], ... [359., 360.]

...

Grid mapping

As described in section 5.6 Grid Mappings and Projections of CF convention.

Info
When the coordinate variables for a horizontal grid are longitude and latitude, a grid mapping variable with `grid_mapping_name` of `latitude_longitude` may be used to specify the ellipsoid and prime meridian.

Code Block
char hcrs ; hcrs:grid_mapping_name = "latitude_longitude" ;

Variables

Common attributes

The following attributes must be included in all the variables

...

dimension should be the most rapidly varying one, and its size is the maximum number of cell vertices. Since a boundary variable is considered to be part of a coordinate variable’s metadata, it is not necessary to provide it with attributes such as long_name and units

Bounds Name	Dimensions	Comments
time_bnds	leadtime, bnds
leadtime_bnds	leadtime, bnds
lat_bnds	lat, bnds	Values (1x1deg grid) prescribed: [-90., 89.], [-89., -88.], ... [89., 90.]
lon_bnds	lon, bnds	Values (1x1deg grid) prescribed: [0., 1.], [1., 2.], ... [359., 360.]
depth_bnds	depth,bnds	Should define the full vertical extent of the soil model layers

Grid mapping

As described in section 5.6 Grid Mappings and Projections of CF convention.

Info
When the coordinate variables for a horizontal grid are longitude and latitude, a grid mapping variable with `grid_mapping_name` of `latitude_longitude` may be used to specify the ellipsoid and prime meridian.

Code Block
char hcrs ; hcrs:grid_mapping_name = "latitude_longitude" ;

Variables

Common attributes

The following attributes must be included in all the variables

attribute name	value	comment
grid_mapping	hcrs
_FillValue	1.0e20	Those attributes must be included JUST when the variable has missing values. It needs to be enforced that they are not present if they should not be there.
missing_value	1.0e20

Static Fields

attributes

name
(CMIP5)

dimensions

standard_name

long_name
(CMIP5)

units

coordinates

NOTES

sftlf

lat,lon

land_area_fraction

"Land Area Fraction"

1

"lat lon"

orog

lat,lon

surface_altitude

"Surface Altitude"

m

"lat lon"

Surface Fields (defined at a given height level)

name (CMIP5/6&C3S)	dimensions	standard_name	long_name (CMIP5/6&C3S)	units	coordinates	cell_methods	NOTES
		attributes
tas	time,lat,lon	air_temperature	"Near-Surface Air Temperature"	K	"reftime realization time leadtime height lat lon"	"time: point" C3S: required CF: recommended	height is usually 2m
tasmax	time,lat,lon	air_temperature	"Daily Maximum Near-Surface Air Temperature"	K	"reftime realization time leadtime height lat lon"	"time: maximum (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional	height is usually 2m C3S: The interval is required to have a value<=3 hours)
tasmin	time,lat,lon	air_temperature	"Daily Minimum Near-Surface Air Temperature"	K	"reftime realization time leadtime height lat lon"	"time: minimum (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional	height is usually 2m C3S: The interval is required to have a value<=3 hours)
tdps	time,lat,lon	dew_point_temperature	"2m dewpoint temperature"	K	"reftime realization time leadtime height lat lon"	"time: point" C3S: required CF: recommended	height is usually 2m
uas	time,lat,lon	x_wind	Eastward Near-Surface Wind	m s-1

Static Fields

...

"lat lon"

...

Surface Fields (defined at a given height level)

K 2m"time: point"
C3S: required
CF: recommended "time: point"
C3S: required
CF: recommended vas

name (CMIP5/6&C3S)	dimensions	standard_name	long_name (CMIP5/6&C3S)	units	coordinates	cell_methods	NOTES
		attributes
tas	time,lat,lon	air_temperature	"Near-Surface Air Temperature"		"reftime realization time leadtime height lat lon"	"time: point" C3S: required CF: recommended	height is usually	10m
tasmaxvas	time,lat,lon	airy_temperaturewind	"Daily Maximum Northward Near-Surface Air Temperature"Wind	m s-1K	"reftime realization time leadtime height lat lon"	"time: maximum (interval: <value> <unit>)point" C3S: interval is required. CF: interval is optionalrecommended	height is usually 2m C3S: The interval is required to have a value<=3 hours) tasmin 10m
wsgmax N/A in CMIP	time,lat,lon	air_temperature	"Daily Minimum Near-Surface Air Temperature"	wind_speed_of_gust	"Maximum Wind Speed of Gust" N/A in CMIP	m s-1K	"reftime realization time leadtime height lat lon"	"timetime: minimum maximum (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional	height is usually 2m10m C3S: The interval is required to have a value<=3 hours)	tdps	time,lat,lon	dew_point_temperature	"2m dewpoint temperature"	K	"reftime realization time leadtime height lat lon"	height is usually 2m	uas	time,lat,lon	x_wind	Eastward Near-Surface Wind	m s-1	"reftime realization time leadtime height lat lon"	height is usually 10m

Surface Fields (not defined at a height level)

name (CMIP5/6&C3S)	dimensions	standard_name	long_name (CMIP5/6&C3S)	units	coordinates	cell_methods	NOTES
		attributes
psl	time,lat,lon

y_windNorthward Near-Surface Wind

air_pressure_at_sea_level

"Sea Level Pressure"

Pa

m s-1

"reftime realization time leadtime

height

lat lon"

"time: point"

C3S: required
CF: recommended

height is usually 10m

wsgmax

N/A in CMIP

clt	time,lat,lon

wind

cloud_

speedm s-

area_

of_gust

"Maximum Wind Speed of Gust"

N/A in CMIP

fraction

"Total Cloud Fraction"

1	"reftime realization time leadtime

height

lat lon"

"

time: maximum (interval: <value> <unit>)

time: point"

C3S:

interval is

required

.

CF:

interval is optional

recommended

height is usually 10m

C3S: The interval is required to have a value<=3 hours)

Surface Fields (not defined at a height level)

clttsosic

lweprc

N/A in CMIP

lwepr

N/A in CMIPLiquid Water Equivalent Thickness of Total Precipitation Amount"

N/A in CMIP

lweprsn

N/A in CMIPlwethicknessofsnowfall_amountmtime: sum"
rsdsSurface Downwelling rldssurfacedownwelling_in_airSurface Downwelling requiredTOA Net Downward Shortwave Radiation"

N/A in CMIP

rsdttauutauv

"Liquid Water Equivalent of Evaporation Amount"

N/A in CMIP

name (CMIP5/6&C3S)	dimensions	standard_name	long_name (CMIP5/6&C3S)	units	coordinates	cell_methods	NOTES
tsl	time,lat,lon	soil_temperature	"Temperature of Soil"	K	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
tso
		attributes
psl	time,lat,lon	airsea_pressure_at_sea_levelsurface_temperature	"Sea Level PressureSurface Temperature"	PaK	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
sitemptop	N/A in CMIP	time,lat,lon	cloudsea_areaice_fractiontemperature	"Surface temperature of sea ice" N/A in CMIP	KTotal Cloud Fraction"1	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
tslsic	time,lat,lon	soil_temperature	"Temperature of Soil"	sea_ice_area_fraction	"Sea Ice Area Fraction"	1K	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
	N/A in CMIP	time,depth,lat,lon	sea_surface_temperature	"Sea Surface Temperature"	mass_content_of_water_in_soil_layer	N/A in CMIP	kg m^-2K	"reftime realization time leadtime depth lat lon"	"time: point" C3S: required CF: recommended
sitemptoplwesnw N/A in CMIP	time,lat,lon	sea_ice_temperature	lwe_thickness_of_surface_snow_amount	"Liquid Water Equivalent Thickness of Surface Snow Amount"Surface temperature of sea ice" N/A in CMIP	Km	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
rhosn	N/A in CMIP	time,lat,lon	sea_ice_area_fraction	"Sea Ice Area Fraction"	snow_density	"Snow density" N/A in CMIP	kg m^-31	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
lweprs N/A in CMIP	time,depth,lat,lon	masslwe_contentthickness_of_water_instratiform_soil_layerprecipitation_amount	"Liquid Water Equivalent Thickness of Stratiform Precipitation Amount" N/A in CMIP	kg m^-2	"reftime realization time leadtime depth lat lon"	"time: pointsum" C3S: required CF: recommended
lwesnwlweprc N/A in CMIP	time,lat,lon	lwe_thickness_of_surfaceconvective_snowprecipitation_amount	"Liquid Water Equivalent Thickness of Surface Snow Convective Precipitation Amount" N/A in CMIP	m	"reftime realization time leadtime lat lon"	"time: pointsum" C3S: required	CF: recommended
rhosnlwepr N/A in CMIP	time,lat,lon	snow_density	lwe_thickness_of_precipitation_amount	"Liquid Water Equivalent Thickness of Total Precipitation Amount"Snow density" N/A in CMIP	kg m^-3	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended sum"
lweprsn lweprs N/A in CMIP	time,lat,lon	lwe_thickness_of_stratiformsnowfall_precipitation_amount	"Liquid Water Equivalent Thickness of Stratiform Precipitation Snowfall Amount" N/A in CMIP	m	"reftime realization time leadtime lat lon"	"time: sum"
hfss	time,lat,lon	surface_upward_sensible_heat_flux	"Surface Upward Sensible Heat Flux"	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
hfls	time,lat,lon	lwesurface_thicknessupward_oflatent_convectiveheat_precipitation_amount	"Liquid Water Equivalent Thickness of Convective Precipitation Amount" N/A in CMIP	flux	"Surface Upward Latent Heat Flux"	W m^-2m	"reftime realization time leadtime lat lon"	"time: sum"		time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rsds	time,lat,lon	lwesurface_downwelling_thicknessshortwave_offlux_precipitationin_amountair	"	Surface Downwelling Shortwave Radiation"	W m^-2m	"reftime realization time leadtime lat lon"	"time: sum"		time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rlds	time,lat,lon	surface_downwelling_	longwave_	flux_	in_air	"Surface Downwelling Longwave Radiation"	W m^-2	"Liquid Water Equivalent Thickness of Snowfall Amount" N/A in CMIP		"reftime realization time leadtime lat lon"	"	time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
hfssrss	time,lat,lon	surface_upwardnet_sensibledownward_heatshortwave_flux	"Surface Upward Sensible Heat FluxNet Shortwave Surface Radiation"	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
hflsrls	time,lat,lon	surface_upwardnet_latentdownward_heatlongwave_flux	"Surface Upward Latent Heat FluxNet Longwave Surface Radiation"	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rst	N/A in CMIP	time,lat,lon	surfacetoa_net_downwellingdownward_shortwave_flux_in_air	"	TOA Net Downward Shortwave Radiation" N/A in CMIP	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rlt	N/A in CMIP	time,lat,lon	toa_net_	downward_longwave_flux		"	TOA Net Downward Longwave Radiation" N/A in CMIP	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is	r equired. CF: interval is optional
rssrsdt	time,lat,lon	surfacetoa_netincoming_downward_shortwave_flux	"Net TOA Incident Shortwave Surface Radiation"	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rlstauu	time,lat,lon	surface_net_downward_longwaveeastward_fluxstress	"Net Longwave Surface RadiationSurface Downward Eastward Wind Stress"	W m^-2Pa	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional		rst N/A in CMIP
tauv	time,lat,lon	toasurface_net_downward_shortwavenorthward_fluxstress	"	Surface Downward Northward Wind Stress"	Pa	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rltlwee N/A in CMIP	time,lat,lon	toalwe_thickness_netof_downwardwater_longwaveevaporation_fluxamount	"TOA Net Downward Longwave RadiationLiquid Water Equivalent of Evaporation Amount" N/A in CMIP	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is r equired. CF: interval is optional		"	"time: sum"
N/A in CMIP		time,lat,lon	toa_incoming_shortwave_flux	"TOA Incident Shortwave Radiation"	runoff_amount	N/A in CMIP	kg W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional		time: sum"
N/A in CMIP		time,lat,lon	surface_downward_eastward_stress	"Surface Downward Eastward Wind Stress"	runoff_amount	N/A in CMIP	kg m^-2Pa	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional		time: sum"
N/A in CMIP		time,lat,lon	surfacesubsurface_downward_northward_stress	"Surface Downward Northward Wind Stress"	runoff_amount	N/A in CMIP	kg m^-2Pa	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional		lwee N/A in CMIP	time,lat,lon	lwe_thickness_of_water_evaporation_amount	time: sum"

Pressure Level Fields

name (CMIP5)	dimensions	standard_name	long_name (CMIP5)	units	coordinates	cell_methods	NOTES
		attributes
zg	time,plev,lat,lon	geopotential_height	"Geopotential Height"	m	"reftime realization time leadtime plev lat lon"	"time:

sum

point"

C3S: required

CF: recommended

N/A in CMIP

ta	time,plev,lat,lon

runoff

air_

amount

N/A in CMIP

kg m^-2

temperature

"Air Temperature"

K

"reftime realization time leadtime plev lat lon"

"time:

sum

point"

C3S: required

CF: recommended

N/A in CMIP

hus	time,plev,lat,lon

surface

specific_

runoff_amount

N/A in CMIP

humidity

"Specific Humidity"

1

kg m^-2

"reftime realization time leadtime plev lat lon"

"time:

sum

point"

C3S: required
CF: recommended

N/A in CMIP

time,plev,lat,lon

subsurface

atmosphere_

runoff

relative_

amount

vorticity

N/A in CMIP

kg m^-2"reftime realization time leadtime lat lon""time: sum"

Pressure Level Fields

zg

name (CMIP5)	dimensions	standard_name	long_name (CMIP5)	units	coordinates	cell_methods	NOTES
s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
N/A in CMIP
		attributes
	time,plev,lat,lon	geopotential_height	"Geopotential Height"	divergence_of_wind	N/A in CMIP	s^-1m	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
taua	time,plev,lat,lon	airx_temperaturewind	"Air TemperatureEastward Wind"	Km s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
husva	time,plev,lat,lon	specificy_humiditywind	"Specific HumidityNorthward Wind"	m s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended

N/A in CMIP

...

N/A in CMIP

...

N/A in CMIP

...

N/A in CMIP

...

character string fully identifying the model and version used to
generate the output. The first portion of the string should be a copy of the
global attribute “model_id”. Additionally, this attribute must include the
year (i.e., model vintage) when this model version was first used in a
scientific application. Finally, it should include information concerning the
component models. The following template should be followed in
constructing this string: '<model_id> <year> atmosphere: <model_name>
(<technical_name>, <resolution_and_levels>); ocean: <model_name>
(<technical_name>, <resolution_and_levels>); sea ice: <model_name>
(<technical_name>); land: <model_name> (<technical_name>)'' For
some models, it may not make much sense to include all these components,
and nothing following “<year>” is absolutely mandatory. As an example,
"source" might contain the string: 'CCSM2 2002 atmosphere: CAM2
(cam2_0_brnchT_itea_2, T42L26); ocean:
POP (pop2_0_ver_1.4.3,
2x3L15); sea ice: CSIM4; land: CLM2.0'. For some models it might be
appropriate to list only a single component, in which case the descriptor
(e.g., 'atmosphere') may be omitted along with the other model components
(e.g., for an aquaplanet experiment: 'CAM2 2002 (cam2_0_brnchT_itea_2,
7T42L26)'). Additional explanatory information may follow the required
information.

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Key

Grid mapping

Variables

Common attributes

Grid mapping

Variables

Common attributes

Static Fields

Surface Fields (defined at a given height level)

Static Fields

Surface Fields (defined at a given height level)

Surface Fields (not defined at a height level)

Surface Fields (not defined at a height level)

Pressure Level Fields

Pressure Level Fields