S2S

Models

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.

1、Level Type: 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	Frequency
Geopotential height	gh	gpm	Instantaneous once a day (00Z)
Temperature	t	K	Instantaneous once a day (00Z)
U-velocity	u	m s^-1	Instantaneous once a day (00Z)
V-velocity	v	m s^-1	Instantaneous once a day (00Z)

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

Name	Abbreviation	Unit	Frequency
Specific humidity	q	kg kg^-1	Instantaneous once a day (00Z)

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

Name	Abbreviation	Unit	Frequency
Vertical velocity	w	pa s^-1	Instantaneous once a day (00Z)

2、Level Type: Potential temperature level parameterss

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

Name	Abbreviation	Unit	Frequency
Potential vorticity	pv	K m² kg^-1 s^-1	Instantaneous once a day (00Z)

3、Level Type: Single-level parameters

The following parameters are available on single levels

Name	Abbreviation	Unit	Frequency
10 metre u-velocity	10u	m s^-1	Instantaneous once a day (00Z)
10 metre v-velocity	10v	m s^-1	Instantaneous once a day (00Z)
CAPE	cape	J kg^-1	Daily averaged
Skin temperature	skt	K	Daily averaged
Snow depth water equivalent	sd	kg m^-2	Daily averaged
Snow density	rsn	kg m^-3	Daily averaged
Snow fall water equivalent	sf	kg m^-2	Accumulated, archived every 24 hours
Snow albedo	asn	%	Daily averaged
Soil moisture top 20cm	sm20	kg m^-3	Daily averaged
Soil moisture top 100 cm	sm100	kg m^-3	Daily averaged
Soil temperature top 20 cm	st20	K	Daily averaged
Soil temperature top 100 cm	st100	K	Daily averaged
Surface air maximum temperature	mx2t6	K	6-hourly
Surface air minimum temperature	mn2t6	K	6-hourly
Surface air temperature	2t	K	Daily averaged
Surface air dewpoint temperature	2d	2d	Daily averaged
Sea surface temperature	sst	K	Daily averaged
Sea surface temperature wtmp	wtmp	K	Daily averaged
Sea ice cover	ci	proportion	Daily averaged
Surface pressure	sp	Pa	Instantaneous once a day (00Z)
Time-integrated top net thermal radiation	ttr	W m^-2 s	Accumulated, archived every 24 hours
Time-integrated surface latent heat flux	slhf	W m^-2 s	Accumulated, archived every 24 hours
Time-integrated surface net solar radiation	ssr	W m^-2 s	Accumulated, archived every 24 hours
Time-integrated surface net thermal radiation	str	W m^-2 s	Accumulated, archived every 24 hours
Time-integrated surface sensible heat flux	sshf	W m^-2 s	Accumulated, archived every 24 hours
Time-integrated surface solar radiation downwards	ssrd	W m^-2 s	Accumulated, archived every 24 hours
Time-integrated surface thermal radiation downwards	strd	W m^-2 s	Accumulated, archived every 24 hours
Total cloud cover	tcc	%	Daily averaged
Total column water	tcw	kg m^_-2	Daily averaged
Total precipitation	tp	kg m^-2	Accumulated, ~~archived every 24 hours~~ 6-hourly
Convective precipitation *	cp	kg m^-2	Accumulated, archived every 24 hours
Northward turbulent surface stress *	nsss	N m^-2 s	Accumulated, archived every 24 hours
Eastward turbulent surface stress *	ewss	N m^-2 s	Accumulated, archived every 24 hours
Mean sea-level pressure	msl	Pa	Instantaneous once a day (00Z)
Water runoff and drainage *	ro	kg m^-2	Accumulated, archived every 24 hours
Surface water runoff *	sro	kg m^-2	Accumulated, archived every 24 hours
Land sea mask	lsm	Proportion of land	Instantaneous once a day (00Z) Only control forecast
Orography	orog	gpm	Instantaneous once a day (00Z) Only control forecast
Soil type	slt	Categorical	Instantaneous once a day (00Z) Only control forecast