1# CODE TABLE 3 Fixed levels or layers for which the data are included 20 0 Reserved 31 sfc Surface (of the Earth, which includes sea surface) 42 sfc Cloud base level 53 sfc Cloud top level 64 sfc 0 deg (C) isotherm level 75 5 Adiabatic condensation level (parcel lifted from surface) 86 6 Maximum wind speed level 97 7 Tropopause level 108 sfc Nominal top of atmosphere 119 9 Sea bottom 12# 10-19 Reserved 1320 20 Isothermal level Temperature in 1/100 K 14# 21-99 Reserved 15100 pl Isobaric level pressure in hectoPascals (hPa) (2 octets) 16101 101 Layer between two isobaric levels pressure of top (kPa) pressure of bottom (kPa) 17102 sfc Mean sea level 0 0 18103 103 Fixed height level height above mean sea level (MSL) in meters 19104 104 Layer between two specfied altitudes above mean sea level - altitude of top, altitude of bottom (hm) 20105 sfc Fixed height above ground height in meters (2 octets) 21106 106 Layer between two height levels above ground - height of top, height of bottom (hm) 22107 107 Sigma level sigma value in 1/10000 (2 octets) 23108 108 Layer between two sigma levels sigma value at top in 1/100 sigma value at bottom in 1/100 24109 ml Hybrid level level number (2 octets) 25110 ml Layer between two hybrid levels level number of top level number of bottom 26111 sfc Depth below land surface centimeters (2 octets) 27112 sfc Layer between two depths below land surface - depth of upper surface, depth of lower surface (cm) 28113 pt Isentropic (theta) level Potential Temp. degrees K (2 octets) 29114 114 Layer between two isentropic levels 475K minus theta of top in Deg. K 475K minus theta of bottom in Deg. K 30115 115 Level at specified pressure difference from ground to level hPa (2 octets) 31116 116 Layer between two levels at specified pressure differences from ground to levels pressure difference from ground to top level hPa pressure difference from ground to bottom level hPa 32117 pv Potential vorticity surface 10-9 K m2 kg-1 s-1 33# 118 Reserved 34119 119 ETA level: ETA value in 1/10000 (2 octets) 35120 120 Layer between two ETA levels: ETA value at top of layer in 1/100, ETA value at bottom of layer in 1/100 36121 121 Layer between two isobaric surfaces (high precision) 1100 hPa minus pressure of top, in hPa 1100 hPa minus pressure of bottom, in hPa 37# 122-124 Reserved 38125 125 Height level above ground (high precision) centimeters (2 octets) 39# 126-127 Reserved 40128 128 Layer between two sigma levels (high precision) 1.1 minus sigma of top, in 1/1000 of sigma 1.1 minus sigma of bottom, in 1/1000 of sigma 41# 129-140 Reserved 42141 141 Layer between two isobaric surfaces (mixed precision) pressure of top, in kPa 1100hPa minus pressure of bottom, in hPa 43# 142-159 Reserved 44160 dp Depth below sea level meters (2 octets) 45# 161-199Reserved 46200 sfc Entire atmosphere considered as a single layer 0 (2 octets) 47201 201 Entire ocean considered as a single layer 0 (2 octets) 48# 202-209 Reserved 49210 pl Isobaric surface (Pa) (ECMWF extension) 50# 211-254 Reserved for local use 51255 255 Indicates a missing value 52