Level at specified pressure difference from ground to level Level at specified pressure difference from ground to level Level at specified pressure difference from ground to level 108 Bottom of thermally active sediment layer Bottom of thermally active sediment layer Bottom of thermally active sediment layer 164 Entire atmosphere Entire atmosphere Entire atmosphere 10 Level of cloud tops Level of cloud tops Level of cloud tops 3 Sea bottom Sea bottom Sea bottom 9 Hybrid pressure level Hybrid pressure level Hybrid pressure level 119 Nominal top of the atmosphere Nominal top of the atmosphere Nominal top of the atmosphere 8 Hybrid height level Hybrid height level Hybrid height level 118 Isothermal level Isothermal level Isothermal level 20 Lake or river bottom Lake or river bottom Lake or river bottom 162 Mean sea level Mean sea level Mean sea level 101 Isentropic (theta) level Isentropic (theta) level Isentropic (theta) level 107 Hybrid level Hybrid level Hybrid level 105 Bottom of root zone Bottom of root zone Bottom of root zone 167 Depth below water surface Depth below water surface Depth below water surface 161 Cloud base level Cloud base level Cloud base level 2 Maximum wind level Maximum wind level Maximum wind level 6 Snow level Snow level Snow level 114 Tropopause Tropopause Tropopause 7 Specified height level above ground Specified height level above ground Specified height level above ground 103 Mixed layer depth Mixed layer depth Mixed layer depth 117 1 Generalized vertical height coordinate Generalized vertical height coordinate Generalized vertical height coordinate 150 Isobaric surface Isobaric surface Isobaric surface 100 Depth below land surface Depth below land surface Depth below land surface 106 Sigma level Sigma level Sigma level 104 Mixing layer Mixing layer Mixing layer 166 Depth below sea level Depth below sea level Depth below sea level 160 Fixed surface types and units Ground or water surface Ground or water surface Ground or water surface 1 Cumulonimbus (CB) top Cumulonimbus (CB) top Cumulonimbus (CB) top 12 Level of adiabatic condensation lifted from the surface Level of adiabatic condensation lifted from the surface Level of adiabatic condensation lifted from the surface 5 Potential vorticity surface Potential vorticity surface Potential vorticity surface 109 Bottom of sediment layer penetrated by thermal wave Bottom of sediment layer penetrated by thermal wave Bottom of sediment layer penetrated by thermal wave 165 Logarithmic hybrid level Logarithmic hybrid level Logarithmic hybrid level 113 Level of 0°C isotherm Level of 0°C isotherm Level of 0°C isotherm 4 Cumulonimbus (CB) base Cumulonimbus (CB) base Cumulonimbus (CB) base 11 Code-table 4.5 - Fixed surface types and units. Fixed surface types and units Missing Missing Missing 255 Specific altitude above mean sea level Specific altitude above mean sea level Specific altitude above mean sea level 102 2014-09-03T09:53:28.985Z Eta level Eta level Eta level 111 Bottom of sediment layer Bottom of sediment layer Bottom of sediment layer 163