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: For a description of how model levels should be interpreted see IFS Documentation Part III - Chapter 2, Section 2.2.1.
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 |