GRIB2 - CODE TABLE 4.5

FIXED SURFACE TYPES AND UNITS

In Section 4, Octets 23 and 29

Revised 07/02/2014
Red text depicts changes made since 04/08/2013



Code Figure Meaning
0
Reserved

1
Ground or Water Surface

2
Cloud Base Level

3
Level of Cloud Tops

4
Level of 0o C Isotherm

5
Level of Adiabatic Condensation Lifted from the Surface

6
Maximum Wind Level

7
Tropopause

8
Nominal Top of the Atmosphere

9
Sea Bottom

10 Entire Atmosphere
11 Cumulonimbus Base (CB) m
12 Cumulonimbus Top (CT) m
13-19
Reserved
20
Isothermal Level
K
21-99
Reserved
100
Isobaric Surface
Pa
101
Mean Sea Level

102
Specific Altitude Above Mean Sea Level
m
103
Specified Height Level Above Ground
m
104
Sigma Level

105
Hybrid Level

106
Depth Below Land Surface
m
107
Isentropic (theta) Level
K
108
Level at Specified Pressure Difference from Ground to Level
Pa
109
Potential Vorticity Surface
K m2 kg-1 s-1
110
Reserved
111
Eta Level
112 Reserved
113 Logarithmic Hybrid Level
114 Snow Level Numeric
115-116 Reserved
117
Mixed Layer Depth
m
118 Hybrid Height Level
119 Hybrid Pressure Level
120-149 Reserved
150 Generalized Vertical Height Coordinate (see Note 5)
151-159 Reserved
160
Depth Below Sea Level
m
161 Depth Below Water Surface m
162 Lake or River Bottom
163 Bottom Of Sediment Layer
164 Bottom Of Thermally Active Sediment Layer
165 Bottom Of Sediment Layer Penetrated By Thermal Wave
166 Maxing Layer
167 Bottom of Root Zone
168-191
Reserved
192-254
Reserved for Local Use

200
Entire atmosphere (considered as a single layer)
201
Entire ocean (considered as a single layer)
204
Highest tropospheric freezing level
206
Grid scale cloud bottom level
207
Grid scale cloud top level
209
Boundary layer cloud bottom level
210
Boundary layer cloud top level
211
Boundary layer cloud layer
212
Low cloud bottom level
213
Low cloud top level
214
Low cloud layer
215
Cloud ceiling
220 Planetary Boundary Layer
221 Layer Between Two Hybrid Levels
222
Middle cloud bottom level
223
Middle cloud top level
224
Middle cloud layer
232
High cloud bottom level
233
High cloud top level
234
High cloud layer
235
Ocean Isotherm Level (1/10 ° C)
236
Layer between two depths below ocean surface

237
Bottom of Ocean Mixed Layer (m)
238
Bottom of Ocean Isothermal Layer (m)
239
Layer Ocean Surface and 26C Ocean Isothermal Level
240
Ocean Mixed Layer
241
Ordered Sequence of Data
242
Convective cloud bottom level
243
Convective cloud top level
244
Convective cloud layer
245
Lowest level of the wet bulb zero
246
Maximum equivalent potential temperature level
247
Equilibrium level
248
Shallow convective cloud bottom level
249
Shallow convective cloud top level
251
Deep convective cloud bottom level
252
Deep convective cloud top level
253
Lowest bottom level of supercooled liquid water layer
254
Highest top level of supercooled liquid water layer
255 Missing



Notes:

(1).  The Eta vertical coordinate system involves normalizing the pressure at some point on a specific level by the mean sea level pressure at that point.

(2).  Hybrid height level (Code figure 118) can be defined as:
z(k)=A(k)+B(k)* orog
(k=1,..., NLevels; orog=orography; z(k)=height in meters at level(k)

(3).  Hybrid pressure level, for which code figure 119 shall be used insteaf of 105, can be defined as:
p(k)=A(k) + B(k) * sp
(k=1,...,NLevels, sp=surface pressure; p(k)=pressure at level (k)

(4).  Ice internal pressure or stress (Pa m) is the integrated pressure across the vertical thickness of a layer of ice. It is produced when concentrated ice reacts to external foreces such as wind and ocean currents

(5).  The definition of a generalized vertical height coordinate implies the absence of coordinate values in section 4 but the presence of an external 3D-GRIB message that specifies the height of every model grid point in meters (see Notes for section 4), i.e., this GRIB message will contain the field with discipline = 0, category = 3, parameterm = 6 (Geometric height).



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