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institution

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)
institution	Controlled Vocabulary: "ECMWF, European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom" "Met Office, Exeter, United Kingdom" " 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" "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 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.	" "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	forecast_type	"forecast" or "hindcast"	"forecast"	To identify the type of data
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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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

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"

...

time time time time time time time

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	"reftime realization time leadtime height	lat lon"	"time: point" C3S: required CF: recommended	height is usually 10m
vas	time,lat,lon	y_wind	Northward Near-Surface Wind	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	time,lat,lon	wind_speed_of_gust	"Maximum Wind Speed of Gust" N/A in CMIP	m s-1	"reftime realization time leadtime height	lat lon"	"time: maximum (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional	height is usually 10m C3S: The interval is required to have a value<=3 hours)

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name (CMIP5/6&C3S)	dimensions	standard_name	long_name (CMIP5/6&C3S)	units	coordinates	cell_methods	NOTES
		attributes
psl	time,lat,lon	air_pressure_at_sea_level	"Sea Level Pressure"	Pa	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
clt	time,lat,lon	cloud_area_fraction	"Total Cloud Fraction"	1	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
tsl	time,lat,lon	soil_temperature	"Temperature of Soil"	K	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
tso	time,lat,lon	sea_surface_temperature	"Sea Surface Temperature"	K	Temperature"	K	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
sitemptop N/A in CMIP	time,lat,lon	sea_ice_temperature	"Surface temperature of sea ice" N/A in CMIP	K	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
sic	time,lat,lon	sea_ice_area_fraction	"Sea Ice Area Fraction"	1	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
N/A in CMIP	time,depth,lat,lon	mass_content_of_water_in_soil_layer	N/A in CMIP	kg m^-2	"reftime realization time leadtime depth lat lon"	"time: point" C3S: required CF: recommended
lwesnw N/A in CMIP	time,lat,lon	lwe_thickness_of_surface_snow_amount	"Liquid Water Equivalent Thickness of Surface Snow Amount" N/A in CMIP	m	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
rhosn N/A in CMIP	time,lat,lon	snow_density	"Snow density" N/A in CMIP	kg m^-3	"reftime realization time leadtime lat lon"	"time: point" C3S: required CF: recommended
lweprs N/A in CMIP	time,lat,lon	lwe_thickness_of_stratiform_precipitation_amount	"Liquid Water Equivalent Thickness of Stratiform Precipitation Amount" N/A in CMIP	m	"reftime realization time leadtime lat lon"	"time: sum"
lweprc N/A in CMIP	time,lat,lon	lwe_thickness_of_convective_precipitation_amount	"Liquid Water Equivalent Thickness of Convective Precipitation Amount" N/A in CMIP	m	"reftime realization time leadtime lat lon"	"time: sum"
lwepr N/A in CMIP	time,lat,lon	lwe_thickness_of_precipitation_amount	"Liquid Water Equivalent Thickness of Total Precipitation Amount" N/A in CMIP	m		m	"reftime realization time leadtime lat lon"	"time: sum"
lweprsn N/A in CMIP	time,lat,lon	lwe_thickness_of_snowfall_amount	"Liquid Water Equivalent Thickness of 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	surface_upward_latent_heat_flux	"Surface Upward Latent Heat Flux"	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rsds	time,lat,lon	surface_downwelling_shortwave_flux_in_air	"Surface Downwelling Shortwave Radiation"	W m^-2	"reftime realization time leadtime lat lon"	"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	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
rss	time,lat,lon	surface_net_downward_shortwave_flux	"Net 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
rls	time,lat,lon	surface_net_downward_longwave_flux	"Net 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	toa_net_downward_shortwave_flux	"TOA Net Downward Shortwave Radiation" N/A in CMIP	W m^-2	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
rsdt	time,lat,lon	toa_incoming_shortwave_flux	"TOA Incident Shortwave Radiation"	W m^-2	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
tauu	time,lat,lon	surface_downward_eastward_stress	"Surface Downward Eastward Wind Stress"	Pa	"reftime realization time leadtime lat lon"	"time: mean (interval: <value> <unit>)" C3S: interval is required. CF: interval is optional
tauv	time,lat,lon	surface_downward_northward_stress	"Surface Downward Northward Wind Stress"	Pa	"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	"Liquid Water Equivalent of Evaporation Amount" N/A in CMIP	m	"reftime realization time leadtime lat lon"	"time: sum"
N/A in CMIP	time,lat,lon	runoff_amount	N/A in CMIP	kg m^-2	"reftime realization time leadtime lat lon"	"time: sum"
N/A in CMIP	time,lat,lon	surface_runoff_amount	N/A in CMIP	kg m^-2	"reftime realization time leadtime lat lon"	"time: sum"
N/A in CMIP	time,lat,lon	subsurface_runoff_amount	N/A in CMIP	kg m^-2	^-2	"reftime realization time leadtime lat lon"	"time: sum"

Pressure Level Fields

name (CMIP5)	dimensions	standard_name	long_name (CMIP5)	units	coordinates	cell_methods
		attributes
zg	time,plev,lat,lon	geopotential_height	"Geopotential Height"	m	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
ta	time,plev,lat,lon	air_temperature	"Air Temperature"	K	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
hus	time,plev,lat,lon	specific_humidity	"Specific Humidity"	1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
N/A in CMIP	time,plev,lat,lon	atmosphere_relative_vorticity	N/A in CMIP	s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
N/A in CMIP	time,plev,lat,lon	divergence_of_wind	N/A in CMIP	s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
ua	time,plev,lat,lon	x_wind	"Eastward Wind"	m s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended
va	time,plev,lat,lon	y_wind	"Northward Wind"	m s^-1	"reftime realization time leadtime plev lat lon"	"time: point" C3S: required CF: recommended

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Pressure Level Fields