There are 46 Surface and Near Surface variables described in terms of the ECMWF GRIB Code Table 128.

GRIB Parameter Code	Parameter Name	Description	Units	Comments
27	CVL	Low vegetation cover	(0-1)	-
28	CVH	High vegetation cover	(0-1)	-
29	TVL	Type of low vegetation	-	Table index
30	TVH	Type of high vegetation	-	Table index
31	CI	Sea-ice cover	(0-1)	-
32	ASN	Snow albedo	(0-1)	-
33	RSN	Snow density	kg m**-3	-
34	SSTK	Sea surface temperature	K	_
35	ISTL1	Ice surface temperature layer 1	K	-
36	ISTL2	Ice surface temperature layer 2	K	-
37	ISTL3	Ice surface temperature layer 3	K	-
38	ISTL4	Ice surface temperature layer 4	K	-
39	SWVL1	Volumetric soil water layer 1	m**3 m**-3	ECMWF has a description of the soil water units on their web site
40	SWVL2	Volumetric soil water layer 2	m**3 m**-3	ECMWF has a description of the soil water units on their web site
41	SWVL3	Volumetric soil water layer 3	m**3 m**-3	ECMWF has a description of the soil water units on their web site
42	SWVL4	Volumetric soil water layer 4	m**3 m**-3	ECMWF has a description of the soil water units on their web site
129	Z	Geopotential	m**2 s**-2	At the surface - orography
136	TCW	Total column water	kg m**-2	Liquid + ice + vapour
137	TCWV	Total column water vapour	kg m**-2	-
139	STL1	Soil temperature level 1	K	Soil temperature (ST) before 19930804
141	SD	Snow depth	m of water equivalent	-
148	CHNK	Charnock	-	Surface stress (SS) before 19980519
151	MSL	Mean sea level pressure	Pa	-
160	SDOR	Standard deviation of orography	-	-
161	ISOR	Anisotropy of sub-gridscale orography	-	-
162	ANOR	Angle of sub-gridscale orography	rad	-
163	SLOR	Slope of sub-gridscale orography	-	-
164	TCC	Total cloud cover	(0 - 1)	-
165	10U	10 metre U wind component	m s**-1	-
166	10V	10 metre V wind component	m s**-1	-
167	2T	2 metre temperature	K	-
168	2D	2 metre dewpoint temperature	K	-
170	STL2	Soil temperature level 2	K	Deep soil temperature (DST) before 19930804
172	LSM	Land-sea mask	(0, 1)	-
173	SR	Surface roughness	m	-
174	AL	Albedo	(0 - 1)	-
183	STL3	Soil temperature level 3	K	Climatological deep soil temperature (CDST) before 19930804
186	LCC	Low cloud cover	(0 - 1)	-
187	MCC	Medium cloud cover	(0 - 1)	-
188	HCC	High cloud cover	(0 - 1)	-
198	SRC	Skin reservoir content	m of water	-
206	TCO3	Total column ozone	kg m**-2	Before 20010612 was in Dobsons. 1 Dobson = 2.1415E-5 kg m**-2
234	LSRH	Logarithm of surface roughness length for heat		-
235	SKT	Skin temperature	K	-
236	STL4	Soil temperature level 4	K	-
238	TSN	Temperature of snow layer	K	-