Number |
Meaning |
Units
|
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
|
|
10-19
|
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 (see note below)
|
|
112-116
|
Reserved |
|
117
|
Mixed Layer Depth
|
m
|
118-159
|
Reserved |
|
160
|
Depth Below Sea Level
|
m
|
161-191
|
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 |
|
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 deg C) |
|
236
|
Layer
between two depths below ocean surface
|
|
237
|
Bottom of
Ocean Mixed Layer (m) |
|
238
|
Bottom of
Ocean Isothermal Layer (m) |
|
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
|
|