S2S Parameters

PARAMETERS

Below is a list of all agreed upon parameters. Participating Centers are expected to produce output fields in GRIB2 data format and with consistent units. All units are defined by the WMO in the GRIB2 manual . For more information please refer to Guide to the WMO Table Driven Code Form.

Rules for parameter exchanges and GRIB2 encoding can be found here.

Pressure level parameters

The following parameters are available on ten pressure levels (1000, 925, 850, 700, 500, 300, 200, 100, 50 and 10 hPa)

Name	Abbreviation	Unit
Geopotential height	gh	gpm
Temperature	t	K
U-velocity	u	m s^-1
V-velocity	v	m s^-1

The following parameters are available on seven pressure levels (1000, 925, 850, 700, 500, 300 and 200 hPa)

Name	Abbreviation	Unit
Specific humidity	q	kg kg^-1

The following parameter are available on 1 pressure level (500 hPa)

Name	Abbreviation	Unit
Vertical velocity	w	pa s^-1

Potential temperature level parameters

The following parameters are available on one potential temperature level (320 K)

Name	Abbreviation	Unit
Potential vorticity	pv	K m² kg^-1 s^-1

Single-level parameters

The following parameters are available on single levels

Name	Abbreviation	Unit
10 metre u-velocity	10u	m s^-1
10 metre v-velocity	10v	m s^-1
CAPE	cape	J kg^-1
Skin temperature	skt	K
Snow depth water equivalent	sd	kg m^-2
Snow density	sden	kg m^-3
Snow fall water equivalent	sf	kg m^-2
Snow albedo	asn	%
Soil moisture top 20cm	sm20	kg m^-3
Soil moisture top 100 cm	sm100	kg m^-3
Soil temperature top 20 cm	st20	K
Soil temperature top 100 cm	st100	K
Surface air maximum temperature	mx2t6	K
Surface air minimum temperature	mn2t6	K
Surface air temperature	2t	K
Surface air dewpoint temperature	2d	2d
Sea Surface Temperature	sstk	K
Sea ice cover	ci	proportion
Surface pressure	sp	Pa
Time-integrated outgoing long-wave radiation	ttr	W m^-2 s
Time-integrated surface latent heat flux	sshlf	W m^-2 s
Time-integrated surface net solar radiation	sssr	W m^-2 s
Time-integrated surface net thermal radiation	str	W m^-2 s
Time-integrated surface sensible heat flux	sshf	W m^-2 s
Time-integrated surface solar radiation downwards	ssrd	W m^-2 s
Time-integrated surface thermal radiation downwards	strd	W m^-2 s
Total cloud cover	tcc	%
Total column water	tcw	kg m^_-2
Total precipitation	tp	kg m^-2
Convective precipitation	cp	kg m^-2
Northward turbulent surface stress	nsss	N m^-2 s
Eastward turbulent surface stress	ewss	N m^-2 s
Mean sea-level pressure	msl	Pa
Water runoff	ro	kg m^-2
Surface water runoff	sro	kg m^-2
Land sea mask	lsm	Proportion of land
Orography	orog	gpm
Soil type	slt	Categorical

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