The following is the list of a(n) and b(n) coefficients defining the model levels, accompanied by the corresponding half-level, ph, and full-level, pf, values of pressure for a surface pressure of 1013.250 hPa. Also provided are the Geopotential and Geometric heights, the temperature and density of the level based on the 1976 version of the International Civil Aviation Organization (ICAO) Standard Atmosphere as described at:

 

 

 

 

 

n a [Pa] b ph [hPa] pf [hPa] Geopotential Altitude [m] Geometric Altitude [m] Temperature [K] Density [kg/m^3]
0 0.000000 0.000000 0.000000 - - - - -
1 2.000040 0.000000 0.0200 0.0100 79302.74 80302.61 198.04 0.000018
2 3.980832 0.000000 0.0398 0.0299 72744.48 73584.94 211.16 0.000049
3 7.387186 0.000000 0.0739 0.0568 68689.83 69438.73 221.12 0.000090
4 12.908319 0.000000 0.1291 0.1015 64847.81 65514.87 231.88 0.000152
5 21.413612 0.000000 0.2141 0.1716 61203.87 61797.72 242.08 0.000247
6 33.952858 0.000000 0.3395 0.2768 57748.06 58276.46 251.76 0.000383
7 51.746601 0.000000 0.5175 0.4285 54470.24 54940.11 260.93 0.000572
8 76.167656 0.000000 0.7617 0.6396 51360.33 51777.87 269.64 0.000826
9 108.715561 0.000000 1.0872 0.9244 48442.75 48814.03 270.65 0.001190
10 150.986023 0.000000 1.5099 1.2985 45759.10 46090.25 267.18 0.001693
11 204.637451 0.000000 2.0464 1.7781 43332.12 43628.96 260.38 0.002379
12 271.356506 0.000000 2.7136 2.3800 41136.44 41403.86 254.23 0.003261
13 352.824493 0.000000 3.5282 3.1209 39141.66 39383.70 248.65 0.004372
14 450.685791 0.000000 4.5069 4.0176 37322.40 37542.40 243.55 0.005746
15 566.519226 0.000000 5.6652 5.0860 35657.28 35858.04 238.89 0.007417
16 701.813354 0.000000 7.0181 6.3417 34128.22 34312.09 234.61 0.009416
17 857.945801 0.000000 8.5795 7.7988 32719.80 32888.77 230.67 0.011778
18 1036.166504 0.000000 10.3617 9.4706 31417.81 31573.56 228.07 0.014466
19 1237.585449 0.000000 12.3759 11.3688 30201.49 30345.38 226.85 0.017458
20 1463.163940 0.000000 14.6316 13.5037 29061.56 29194.77 225.71 0.020842
21 1713.709595 0.000000 17.1371 15.8844 27991.33 28114.89 224.64 0.024633
22 1989.874390 0.000000 19.8987 18.5179 26984.85 27099.67 223.63 0.028846
23 2292.155518 0.000000 22.9216 21.4101 26036.84 26143.71 222.69 0.033493
24 2620.898438 0.000000 26.2090 24.5653 25142.55 25242.19 221.79 0.038584
25 2976.302246 0.000000 29.7630 27.9860 24297.75 24390.80 220.95 0.044125
26 3358.425781 0.000000 33.5843 31.6736 23498.64 23585.66 220.15 0.050120
27 3767.196045 0.000000 37.6720 35.6281 22741.78 22823.27 219.39 0.056572
28 4202.416504 0.000000 42.0242 39.8481 22024.08 22100.50 218.67 0.063480
29 4663.776367 0.000000 46.6378 44.3310 21342.73 21414.49 217.99 0.070843
30 5150.859863 0.000000 51.5086 49.0732 20695.19 20762.65 217.35 0.078655
31 5663.156250 0.000000 56.6316 54.0701 20079.13 20142.64 216.73 0.086910
32 6199.839355 0.000000 61.9984 59.3150 19492.24 19552.08 216.65 0.095375
33 6759.727051 0.000000 67.5973 64.7978 18931.56 18988.00 216.65 0.104191
34 7341.469727 0.000000 73.4150 70.5061 18396.14 18449.43 216.65 0.113370
35 7942.926270 0.000014 79.4434 76.4292 17884.58 17934.94 216.65 0.122894
36 8564.624023 0.000055 85.7016 82.5725 17394.28 17441.91 216.65 0.132772
37 9208.305664 0.000131 92.2162 88.9589 16921.83 16966.91 216.65 0.143041
38 9873.560547 0.000279 99.0182 95.6172 16464.09 16506.76 216.65 0.153747
39 10558.881836 0.000548 106.1445 102.5813 16018.24 16058.63 216.65 0.164945
40 11262.484375 0.001000 113.6382 109.8913 15581.70 15619.91 216.65 0.176699
41 11982.662109 0.001701 121.5502 117.5942 15152.05 15188.19 216.65 0.189085
42 12713.897461 0.002765 129.9403 125.7453 14727.04 14761.17 216.65 0.202192
43 13453.225586 0.004267 138.8558 134.3981 14305.00 14337.21 216.65 0.216105
44 14192.009766 0.006322 148.3260 143.5909 13885.42 13915.75 216.65 0.230887
45 14922.685547 0.009035 158.3816 153.3538 13468.26 13496.80 216.65 0.246585
46 15638.053711 0.012508 169.0545 163.7180 13053.52 13080.33 216.65 0.263250
47 16329.560547 0.016860 180.3786 174.7166 12641.18 12666.32 216.65 0.280935
48 16990.623047 0.022189 192.3889 186.3837 12231.23 12254.76 216.65 0.299695
49 17613.281250 0.028610 205.1222 198.7556 11823.65 11845.64 216.65 0.319588
50 18191.029297 0.036227 218.6172 211.8697 11418.44 11438.95 216.65 0.340675
51 18716.968750 0.045146 232.9140 225.7656 11015.57 11034.66 216.65 0.363019
52 19184.544922 0.055474 248.0547 240.4844 10613.07 10630.79 219.17 0.382249
53 19587.513672 0.067316 264.0833 256.0690 10207.82 10224.21 221.80 0.402186
54 19919.796875 0.080777 281.0456 272.5644 9800.09 9815.19 224.45 0.423040
55 20175.394531 0.095964 298.9895 290.0175 9389.89 9403.75 227.12 0.444844
56 20348.916016 0.112979 317.9651 308.4773 8977.23 8989.90 229.80 0.467635
57 20434.158203 0.131935 338.0245 327.9948 8562.14 8573.66 232.50 0.491453
58 20426.218750 0.152934 359.2221 348.6233 8144.61 8155.04 235.21 0.516334
59 20319.011719 0.176091 381.6144 370.4182 7724.68 7734.06 237.94 0.542320
60 20107.031250 0.201520 405.2606 393.4375 7302.35 7310.73 240.68 0.569453
61 19785.357422 0.229315 430.2069 417.7337 6877.76 6885.19 243.44 0.597764
62 19348.775391 0.259554 456.4813 443.3441 6451.33 6457.87 246.22 0.627270
63 18798.822266 0.291993 483.8505 470.1659 6025.61 6031.31 248.98 0.657826
64 18141.296875 0.326329 512.0662 497.9584 5604.74 5609.68 251.72 0.689139
65 17385.595703 0.362203 540.8577 526.4620 5192.42 5196.66 254.40 0.720911
66 16544.585938 0.399205 569.9401 555.3989 4791.93 4795.53 257.00 0.752832
67 15633.566406 0.436906 599.0310 584.4855 4406.04 4409.09 259.51 0.784601
68 14665.645508 0.475016 627.9668 613.4989 4036.32 4038.88 261.91 0.815991
69 13653.219727 0.513280 656.6129 642.2899 3683.17 3685.30 264.21 0.846863
70 12608.383789 0.551458 684.8491 670.7310 3346.69 3348.45 266.40 0.877102
71 11543.166992 0.589317 712.5573 698.7032 3026.84 3028.28 268.48 0.906605
72 10471.310547 0.626559 739.5739 726.0656 2723.84 2725.01 270.45 0.935249
73 9405.222656 0.662934 765.7697 752.6718 2437.96 2438.89 272.30 0.962904
74 8356.252930 0.698224 791.0376 778.4036 2169.15 2169.89 274.05 0.989474
75 7335.164551 0.732224 815.2774 803.1575 1917.26 1917.84 275.69 1.014877
76 6353.920898 0.764679 838.3507 826.8141 1682.35 1682.80 277.21 1.039015
77 5422.802734 0.795385 860.1516 849.2512 1464.53 1464.87 278.63 1.061788
78 4550.215820 0.824185 880.6080 870.3798 1263.63 1263.88 279.94 1.083128
79 3743.464355 0.850950 899.6602 890.1341 1079.33 1079.52 281.13 1.102991
80 3010.146973 0.875518 917.2205 908.4403 911.48 911.61 282.23 1.121323
81 2356.202637 0.897767 933.2247 925.2226 759.99 760.08 283.21 1.138067
82 1784.854614 0.917651 947.6584 940.4415 624.53 624.59 284.09 1.153202
83 1297.656128 0.935157 960.5245 954.0914 504.53 504.57 284.87 1.166736
84 895.193542 0.950274 971.8169 966.1707 399.50 399.52 285.55 1.178683
85 576.314148 0.963007 981.5301 976.6735 309.03 309.04 286.14 1.189047
86 336.772369 0.973466 989.7322 985.6311 232.49 232.50 286.64 1.197870
87 162.043427 0.982238 996.8732 993.3027 167.39 167.39 287.06 1.205414
88 54.208336 0.989153 1002.8013 999.8373 112.26 112.26 287.42 1.211831
89 6.575628 0.994204 1007.4431 1005.1222 67.88 67.88 287.71 1.217015
90 0.003160 0.997630 1010.8487 1009.1459 34.22 34.22 287.93 1.220959
91 0.000000 1.000000 1013.2500 1012.0494 10.00 10.00 288.09 1.223803

A description of how model levels should be interpreted is available in Section 2.2 of III. Dynamics and numerical procedures.