Parameters forming part of the Climate Change Adaptation Digital Twin (DT) are investigated here. See the encodings below, which are current for ecCodes 2.33.0.

Please note that additional keys are often necessary in addition to the base parameter definition below. For example for:

statistical processing (e.g. time interval of processing)
level information (e.g. a given pressure level, say 300 hPa)

Any entry with localTablesVersion=1 should not be used in production outside ECMWF.

Legend:

Parameter ready for GRIB2 archiving

Parameter with clarifications required for GRIB2 archiving

Parameter which needs to be created/modified for GRIB2 archiving

Contents:

Instantaneous encodings

Fields on a single level or surface

Atmosphere

Time resolution: Hourly

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	local Tables Version	comments
78	Total column cloud liquid water	tclw	kg m**-2	0	1	69	1			8				GG
79	Total column cloud ice water	tciw	kg m**-2	0	1	70	1			8
134	Surface pressure	sp	Pa	0	3	0	1							GG
137	Total column vertically-integrated water vapour	tcwv	kg m**-2	0	1	64	1			8				GG
141	Snow depth	sd	m of water equivalent	0	1	254	1						1	GG. Depth of snow with conversion to water. ECMWF unit.
148	Charnock	chnk	Numeric	10	0	76	1							GG
151	Mean sea level pressure	msl	Pa	0	3	0	101							GG
159	Boundary layer height	blh	m	0	3	18	1							GG
164	Total cloud cover	tcc	(0 - 1)	0	6	192	1			8			1	GG. ECMWF unit.
165	10 metre U wind component	10u	m s**-1	0	2	2	103	0	10					GG
166	10 metre V wind component	10v	m s**-1	0	2	3	103	0	10					GG
167	2 metre temperature	2t	K	0	0	0	103	0	2					GG
168	2 metre dewpoint temperature	2d	K	0	0	6	103	0	2					GG
186	Low cloud cover	lcc	(0 - 1)	0	6	193	1			100	0	80000	1	GG. ECMWF unit.
187	Medium cloud cover	mcc	(0 - 1)	0	6	194	100	0	80000	100	0	45000	1	GG. ECMWF unit.
188	High cloud cover	hcc	(0 - 1)	0	6	195	100	0	45000	8			1	GG. ECMWF unit.
235	Skin temperature	skt	K	0	0	17	1							GG
260048	Total precipitation rate	tprate	kg m-2 s-1	0	1	52	1							GG
~~3066~~	~~Snow depth~~	~~sde~~	m	0	1	11	~~114~~							~~GG. Depth of snow without conversion to water.~~ Not yet supported by ClimateDT IFS.
~~3073~~	~~Low cloud cover~~	~~lcc~~	%	0	6	3	1			~~100~~	0	~~80000~~		GG. WMO unit. Not yet supported by ClimateDT IFS.
~~3074~~	~~Medium cloud cover~~	~~mcc~~	%	0	6	4	~~100~~	0	~~80000~~	~~100~~	0	~~45000~~		GG. WMO unit. Not yet supported by ClimateDT IFS.
~~3075~~	~~High cloud cover~~	~~hcc~~	%	0	6	5	~~100~~	0	~~45000~~	8				GG. WMO unit. Not yet supported by ClimateDT IFS.
~~228141~~	~~Snow depth water equivalent~~	sd	~~kg m**-2~~	0	1	60	1							GG. Depth of snow with conversion to water. WMO unit. Not yet supported by ClimateDT IFS.
~~228164~~	~~Total Cloud Cover~~	~~tcc~~	%	0	6	1	1			8				~~GG.~~ ~~WMO unit.~~ Not yet supported by ClimateDT IFS.
~~210061~~	~~Carbon dioxide mass mixing ratio~~	~~co2~~	~~kg kg**-1~~	0	20	2								~~GG. With key {chemicalConstituent=3; is_chemical=1} for CO2. Need also productionStatusOfProcessedData=12 to get DE pseudocentre encoding.~~ Not yet supported by ClimateDT IFS.
~~260510~~	~~Cloudy brightness temperature~~	~~clbt~~	K	3	1	14								~~GG.~~ Needs Simulated Satellite mode on, which we won't activate for ClimateDT.

Sea ice

Time resolution: Hourly (when produced)

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	comments
262000	Sea ice thickness	sithick	m	10	2	1	174	missing	missing	176	missing	missing	O2D
262001	Sea ice area fraction	siconc	Fraction	10	2	0	174	missing	missing	176	missing	missing	O2D
262003	Eastward sea ice velocity	siue	m s**-1	10	2	4	174	missing	missing	176	missing	missing	O2D
262004	Northward sea ice velocity	sivn	m s**-1	10	2	5	174	missing	missing	176	missing	missing	O2D
262008	Sea ice volume per unit area	sivol	m3 m-2	10	2	15	174	missing	missing	176	missing	missing	O2D
262009	Snow volume over sea ice per unit area	snvol	m3 m-2	10	2	16	173	missing	missing	175	missing	missing	O2D
262021	X-component of sea ice velocity	six	m s**-1	10	2	24	174	missing	missing	176	missing	missing	O2D
262022	Y-component of sea ice velocity	siy	m s**-1	10	2	25	174	missing	missing	176	missing	missing	O2D

Ocean

Time resolution: Hourly (when produced)

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	comments
262100	Sea surface practical salinity	sos	g kg**-1	10	3	3	160	0	0	missing	missing	missing	O2D
262101	Sea surface temperature	tos	K	10	3	0	160	0	0	missing	missing	missing	O2D
262121	Vertically-integrated heat content in the upper 300 m	hc300m	J m**-2	10	4	22	160	0	0	160	0	300	O2D
262122	Vertically-integrated heat content in the upper 700 m	hc700m	J m**-2	10	4	22	160	0	0	160	0	700	O2D
262124	Sea surface height	zos	m	10	3	1	160	0	0	missing	missing	missing	O2D
~~262145~~	~~Sea surface salinity~~	~~sss~~	~~kg kg**-1~~	10	3	21	~~160~~	0	0	~~missing~~	~~missing~~	~~missing~~	~~O2D.~~ Will use practical salinity.
XXX	Vertically integrated meridional volume transport	XXX	m3 m-1 s**-1	10	4	44							O2D. Awaiting input from ClimateDT.

Fields on pressure levels

Time resolution: Hourly

19 pressure levels: (1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10, 5, 1)

param Id	name	short Name	units	parameter Category	parameter Number	type Of First Fixed Surface	comments
60	Potential vorticity	pv	K m2 kg-1 s**-1	2	14	100	GG
129	Geopotential	z	m2 s-2	3	4	100	GG
130	Temperature	t	K	0	0	100	GG
131	U component of wind	u	m s**-1	2	2	100	GG
132	V component of wind	v	m s**-1	2	3	100	GG
133	Specific humidity	q	kg kg**-1	1	0	100	GG
135	Vertical velocity	w	Pa s**-1	2	8	100	GG. This is in "Pa s-1" not "m s-1".
157	Relative humidity	r	%	1	1	100	GG
246	Specific cloud liquid water content	clwc	kg kg**-1	1	83	100	GG
~~138~~	~~Vorticity (relative)~~	vo	~~s**-1~~	2	12	~~100~~	~~SH.~~ Not needed if we have U and V wind components.
~~155~~	~~Divergence~~	d	~~s**-1~~	2	13	~~100~~	~~SH.~~ Not needed if we have U and V wind components.
~~156~~	~~Geopotential height~~	gh	~~gpm~~	3	5	~~100~~	~~GG.~~ Not yet supported by ClimateDT IFS. Can be computed using geopotential - added below.

Fields on model levels

Atmosphere

Time resolution: ...

~~137 model levels: (137, 136, ..., 1) - L137 model level definitions~~

~~param Id~~	~~name~~	~~short Name~~	~~units~~	~~parameter Category~~	~~parameter Number~~	~~type Of First Fixed Surface~~	~~comments~~
77	~~Eta-coordinate vertical velocity~~	~~etadot~~	~~s**-1~~	2	32	~~105~~	~~GG. Not in official portfolio.~~
~~248~~	~~Fraction of cloud cover~~	cc	~~(0-1)~~	6	32	~~105~~	~~GG. Not in official portfolio.~~
~~260238~~	~~Geometric vertical velocity~~	wz	~~m s**-1~~	2	9	~~105~~	~~GG. Not in official portfolio. Replaces 120; Exper. product~~
~~247~~	~~Specific cloud ice water content~~	~~ciwc~~	~~kg kg**-1~~	1	84	~~105~~	~~GG. Not in official portfolio.~~
~~246~~	~~Specific cloud liquid water content~~	~~clwc~~	~~kg kg**-1~~	1	83	~~105~~	~~GG. Not in official portfolio.~~
~~133~~	~~Specific humidity~~	q	~~kg kg**-1~~	1	0	~~105~~	~~GG. Not in official portfolio.~~
75	~~Specific rain water content~~	~~crwc~~	~~kg kg**-1~~	1	85	~~105~~	~~GG. Not in official portfolio.~~
76	~~Specific snow water content~~	~~cswc~~	~~kg kg**-1~~	1	86	~~105~~	~~GG. Not in official portfolio.~~
~~130~~	~~Temperature~~	t	K	0	0	~~105~~	~~GG. Not in official portfolio.~~
~~131~~	~~U component of wind~~	u	~~m s**-1~~	2	2	~~105~~	~~GG. Not in official portfolio.~~
~~132~~	~~V component of wind~~	v	~~m s**-1~~	2	3	~~105~~	~~GG. Not in official portfolio.~~
~~135~~	~~Vertical velocity~~	w	~~Pa s**-1~~	2	8	~~105~~	~~GG. Also called omega. Not in official portfolio.~~

Ocean

Time resolution: Hourly (when produced)

75 model levels: (1, ..., 75)

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	type Of Second Fixed Surface	comments
262500	Sea water practical salinity	so	g kg**-1	10	4	21	168	168	O3D
262501	Sea water potential temperature	thetao	K	10	4	18	168	168	O3D
262505	Northward sea water velocity	von	m s**-1	10	4	24	168	168	O3D
262506	Eastward sea water velocity	uoe	m s**-1	10	4	23	168	168	O3D
262507	Upward sea water velocity	wo	m s**-1	10	4	27	168	168	O3D
~~262516~~	~~Sea water salinity~~	~~salo~~	~~kg kg**-1~~	10	4	3	~~168~~	~~168~~	~~O3D.~~ Will use practical salinity.

Sea-ice/snow/soil

Time resolution: Hourly
5 model levels: (1, ..., 5)

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	type Of Statistical Processing	local Tables Version	comments
228141	Snow depth water equivalent	sd	kg m**-2	0	1	60	114								GG. Depth of snow with conversion to water. WMO unit.

Fields on height levels

Time resolution: Hourly

Currently 100m only. These are only for height levels >10m to preserve backwards compatibility with longstanding model fields (2t, 10u, 10v,...)

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	type Of Statistical Processing	local Tables Version	comments
228246	100 metre U wind component	100u	m s**-1	0	2	2	103	0	100						GG
228247	100 metre V wind component	100v	m s**-1	0	2	3	103	0	100						GG

Mean encodings

Fields on a single level or surface

Atmosphere

Not in output for now.

Time resolution: 1 x hourly, 1 x monthly

~~param Id~~	~~name~~	~~short Name~~	~~units~~	~~parameter Category~~	~~parameter Number~~	~~type Of First Fixed Surface~~	~~scale Factor Of First Fixed Surface~~	~~scaled Value Of First Fixed Surface~~	~~comments~~
~~235031~~	~~Mean snowfall rate~~	~~msr~~	~~kg m-2 s-1~~	1	53	1			~~GG. WMO unit.~~
~~235033~~	~~Mean surface sensible heat flux~~	~~msshf~~	~~W m**-2~~	0	11	1			~~GG.~~
~~235034~~	~~Mean surface latent heat flux~~	~~mslhf~~	~~W m**-2~~	0	10	1			~~GG.~~
~~235035~~	~~Mean surface downward short-wave radiation flux~~	~~msdwswrf~~	~~W m**-2~~	4	7	1			~~GG.~~
~~235036~~	~~Mean surface downward long-wave radiation flux~~	~~msdwlwrf~~	~~W m**-2~~	5	3	1			~~GG.~~
~~235037~~	~~Mean surface net short-wave radiation flux~~	~~msnswrf~~	~~W m**-2~~	4	9	1			~~GG.~~
~~235038~~	~~Mean surface net long-wave radiation flux~~	~~msnlwrf~~	~~W m**-2~~	5	5	1			~~GG.~~
~~235039~~	~~Mean top net short-wave radiation flux~~	~~mtnswrf~~	~~W m**-2~~	4	9	8			~~GG.~~
~~235040~~	~~Mean top net long-wave radiation flux~~	~~mtnlwrf~~	~~W m**-2~~	5	5	8			~~GG.~~
~~235043~~	~~Mean evaporation rate~~	~~mer~~	~~kg m-2 s-1~~	1	79	1			~~GG. WMO unit.~~
~~235053~~	~~Mean top downward short-wave radiation flux~~	~~mtdwswrf~~	~~W m**-2~~	4	7	8			~~GG.~~
~~235055~~	~~Mean total precipitation rate~~	~~mtpr~~	~~kg m-2 s-1~~	1	52	1			~~GG. WMO unit.~~
~~228004~~	~~Mean 2 metre temperature~~	~~mean2t~~	K	0	0	~~103~~	0	2	~~GG.~~

Sea ice

Time resolution: 1 x daily~~, 1 x monthly~~

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	comments
263000	Time-mean sea ice thickness	avg_sithick	m	10	2	1	174	missing	missing	176	missing	missing	O2D
263001	Time-mean sea ice area fraction	avg_siconc	Fraction	10	2	0	174	missing	missing	176	missing	missing	O2D
263003	Time-mean eastward sea ice velocity	avg_siue	m s**-1	10	2	4	174	missing	missing	176	missing	missing	O2D
263004	Time-mean northward sea ice velocity	avg_sivn	m s**-1	10	2	5	174	missing	missing	176	missing	missing	O2D
263008	Time-mean sea ice volume per unit area	avg_sivol	m3 m-2	10	2	15	174	missing	missing	176	missing	missing	O2D
263009	Time-mean snow volume over sea ice per unit area	avg_snvol	m3 m-2	10	2	16	173	missing	missing	175	missing	missing	O2D
263021	Time-mean X-component of sea ice velocity	avg_six	m s**-1	10	2	24	174	missing	missing	176	missing	missing	O2D
263022	Time-mean Y-component of sea ice velocity	avg_siy	m s**-1	10	2	25	174	missing	missing	176	missing	missing	O2D

Ocean

Time resolution: 1 x daily~~, 1 x monthly~~

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	scale Factor Of First Fixed Surface	scaled Value Of First Fixed Surface	type Of Second Fixed Surface	scale Factor Of Second Fixed Surface	scaled Value Of Second Fixed Surface	comments
263100	Time-mean sea surface practical salinity	avg_sos	g kg**-1	10	3	3	160	0	0	missing	missing	missing	O2D
263101	Time-mean sea surface temperature	avg_tos	K	10	3	0	160	0	0	missing	missing	missing	O2D
263121	Time-mean vertically-integrated heat content in the upper 300 m	avg_hc300m	J m**-2	10	4	22	160	0	0	160	0	300	O2D
263122	Time-mean vertically-integrated heat content in the upper 700 m	avg_hc700m	J m**-2	10	4	22	160	0	0	160	0	700	O2D
263124	Time-mean sea surface height	avg_zos	m	10	3	1	160	0	0	missing	missing	missing	O2D
~~263145~~	~~Time-mean sea surface salinity~~	~~avg_sss~~	~~kg kg**-1~~	10	3	21	~~160~~	0	0	~~missing~~	~~missing~~	~~missing~~	~~O2D.~~ Will use practical salinity.
XXX	Vertically integrated meridional volume transport	XXX	m3 m-1 s**-1	10	4	44							O2D. Awaiting input from ClimateDT.

Fields on model levels

Ocean

Time resolution: 1 x daily~~, 1 x monthly~~

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	type Of Second Fixed Surface	type Of Statistical Processing	comments
263500	Time-mean sea water practical salinity	avg_so	g kg**-1	10	4	21	168	168	0	O3D
263501	Time-mean sea water potential temperature	avg_thetao	K	10	4	18	168	168	0	O3D
263505	Time-mean northward sea water velocity	avg_von	m s**-1	10	4	24	168	168	0	O3D
263506	Time-mean eastward sea water velocity	avg_uoe	m s**-1	10	4	23	168	168	0	O3D
263507	Time-mean upward sea water velocity	avg_wo	m s**-1	10	4	27	168	168	0	O3D
~~263516~~	~~Time-mean sea water salinity~~	~~salo~~	~~kg kg**-1~~	10	4	3	~~168~~	~~168~~		~~O3D.~~ Will use practical salinity.

Accumulated encodings

Fields on a single level or surface

Atmosphere

Time resolution: Hourly accumulation

param Id	name	short Name	units	discipline	parameter Category	parameter Number	type Of First Fixed Surface	type Of Second Fixed Surface	type Of Statistical Processing	local Tables Version	comments
8	Surface runoff	sro	m	2	0	202	1		1	1	GG. ECMWF unit.
9	Sub-surface runoff	ssro	m	2	0	204	1		1	1	GG. ECMWF unit.
144	Snowfall	sf	m of water equivalent	0	1	198	1		1	1	GG. ECMWF unit.
146	Surface sensible heat flux	sshf	J m**-2	0	0	11	1		1		GG
147	Surface latent heat flux	slhf	J m**-2	0	0	10	1		1		GG
169	Surface short-wave (solar) radiation downwards	ssrd	J m**-2	0	4	7	1		1		GG
175	Surface long-wave (thermal) radiation downwards	strd	J m**-2	0	5	3	1		1		GG
176	Surface net short-wave (solar) radiation	ssr	J m**-2	0	4	9	1		1		GG
177	Surface net long-wave (thermal) radiation	str	J m**-2	0	5	5	1		1		GG
178	Top net short-wave (solar) radiation	tsr	J m**-2	0	4	9	8		1		GG
179	Top net long-wave (thermal) radiation	ttr	J m**-2	0	5	5	8		1		GG
180	Time-integrated eastward turbulent surface stress	ewss	N m**-2 s	0	2	62	1		1		GG
181	Time-integrated northward turbulent surface stress	nsss	N m**-2 s	0	2	63	1		1		GG
182	Evaporation	e	m of water equivalent	0	1	199	1		1	1	GG. ECMWF unit.
212	TOA incident short-wave (solar) radiation	tisr	J m**-2	0	4	7	8		1		GG
228	Total precipitation	tp	m	0	1	193	1	255	1	1	GG. ECMWF unit.
~~228144~~	~~Snowfall water equivalent~~	sf	~~kg m**-2~~	0	1	53	1		1		~~GG.~~ ~~WMO unit.~~ Not yet supported by ClimateDT IFS.
~~228228~~	~~Total Precipitation~~	tp	~~kg m**-2~~	0	1	52	1		1		~~GG.~~ ~~WMO unit.~~ Not yet supported by ClimateDT IFS.
~~231010~~	~~Surface runoff~~	~~surfro~~	~~kg m**-2~~	2	0	51	1		1		~~GG.~~ ~~WMO unit.~~ Not yet supported by ClimateDT IFS.
~~231012~~	~~Sub-surface runoff~~	~~ssurfro~~	~~kg m**-2~~	2	0	52	1		1		~~GG.~~ ~~WMO unit.~~ Not yet supported by ClimateDT IFS.
~~260259~~	~~Evaporation~~	~~eva~~	~~kg m**-2~~	0	1	79	1		1		~~GG.~~ ~~WMO unit.~~ Not yet supported by ClimateDT IFS.

Maximum encodings

There are no maximum encodings for this dataset.

Minimum encodings

There are no minimum encodings for this dataset.

Conversions

The conversion between the base parameter, mean and accumulation is as follows for relevant parameters:

Inst paramId	Mean paramId	Accum paramId
260049	235031	228144
231	235033	146
X	235034	147
X	235035	169
X	235036	175
X	235037	176
X	235038	177
X	235039	178
X	235040	179
232	235043	260259
X	235053	212
260048	235055	228228
167	228004	X