L60 model level definitions

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:

A description of how model levels should be interpreted is available in the IFS documentation Part III- chapter 2 (DISCRETISATION --> Vertical discretisation)

 

 

 

 

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 20.000000 0.000000 0.2000 0.1000 64947.31 65616.42 231.60 0.000150
2 38.425343 0.000000 0.3843 0.2921 57350.89 57872.01 252.87 0.000402
3 63.647804 0.000000 0.6365 0.5104 53125.16 53572.02 264.70 0.000672
4 95.636963 0.000000 0.9564 0.7964 49623.45 50013.12 270.65 0.001025
5 134.483307 0.000000 1.3448 1.1506 46709.58 47054.67 269.84 0.001485
6 180.584351 0.000000 1.8058 1.5753 44259.61 44569.33 262.98 0.002087
7 234.779053 0.000000 2.3478 2.0768 42156.09 42436.98 257.09 0.002814
8 298.495789 0.000000 2.9850 2.6664 40294.73 40551.28 251.88 0.003688
9 373.971924 0.000000 3.7397 3.3623 38600.97 38836.35 247.13 0.004740
10 464.618134 0.000000 4.6462 4.1930 37018.28 37234.70 242.70 0.006018
11 575.651001 0.000000 5.7565 5.2013 35500.64 35699.63 238.45 0.007599
12 713.218079 0.000000 7.1322 6.4443 34017.99 34200.66 234.30 0.009582
13 883.660522 0.000000 8.8366 7.9844 32561.15 32728.48 230.22 0.012082
14 1094.834717 0.000000 10.9483 9.8925 31127.02 31279.89 227.78 0.015130
15 1356.474609 0.000000 13.5647 12.2565 29702.74 29841.91 226.35 0.018863
16 1680.640259 0.000000 16.8064 15.1856 28287.36 28413.56 224.94 0.023518
17 2082.273926 0.000000 20.8227 18.8146 26880.84 26994.77 223.53 0.029322
18 2579.888672 0.000000 25.7989 23.3108 25483.11 25585.48 222.13 0.036557
19 3196.421631 0.000000 31.9642 28.8816 24094.12 24185.62 220.74 0.045579
20 3960.291504 0.000000 39.6029 35.7836 22713.82 22795.11 219.36 0.056826
21 4906.708496 0.000000 49.0671 44.3350 21342.15 21413.91 217.99 0.070849
22 6018.019531 0.000000 60.1802 54.6236 20014.52 20077.62 216.66 0.087826
23 7306.631348 0.000000 73.0663 66.6233 18755.37 18810.77 216.65 0.107127
24 8765.053711 0.000076 87.7274 80.3968 17563.62 17612.18 216.65 0.129274
25 10376.126953 0.000461 104.2288 95.9781 16440.20 16482.75 216.65 0.154328
26 12077.446289 0.001815 122.6137 113.4212 15381.19 15418.43 216.65 0.182375
27 13775.325195 0.005081 142.9017 132.7577 14382.89 14415.44 216.65 0.213467
28 15379.805664 0.011143 165.0886 153.9952 13441.79 13470.22 216.65 0.247616
29 16819.474609 0.020678 189.1466 177.1176 12554.62 12579.42 216.65 0.284796
30 18045.183594 0.034121 215.0251 202.0859 11718.27 11739.87 216.65 0.324943
31 19027.695313 0.051690 242.6523 228.8387 10930.02 10948.81 217.10 0.367189
32 19755.109375 0.073534 272.0593 257.3558 10175.26 10191.54 222.01 0.403822
33 20222.205078 0.099675 303.2174 287.6383 9444.61 9458.63 226.76 0.441886
34 20429.863281 0.130023 336.0439 319.6307 8737.51 8749.51 231.36 0.481280
35 20384.480469 0.164384 370.4072 353.2256 8054.20 8064.40 235.80 0.521847
36 20097.402344 0.202476 406.1328 388.2700 7395.38 7403.97 240.08 0.563389
37 19584.330078 0.243933 443.0086 424.5707 6761.89 6769.08 244.20 0.605674
38 18864.750000 0.288323 480.7907 461.8996 6154.67 6160.62 248.14 0.648445
39 17961.357422 0.335155 519.2093 500.0000 5574.58 5579.46 251.92 0.691426
40 16899.468750 0.383892 557.9734 538.5913 5022.43 5026.39 255.50 0.734331
41 15706.447266 0.433963 596.7774 577.3754 4498.91 4502.09 258.91 0.776863
42 14411.124023 0.484772 635.3060 616.0417 4004.59 4007.11 262.12 0.818729
43 13043.218750 0.535710 673.2403 654.2732 3539.96 3541.93 265.14 0.859634
44 11632.758789 0.586168 710.2627 691.7515 3105.35 3106.86 267.97 0.899295
45 10209.500977 0.635547 746.0635 728.1631 2701.00 2702.14 270.59 0.937436
46 8802.356445 0.683269 780.3455 763.2045 2327.04 2327.89 273.02 0.973801
47 7438.803223 0.728786 812.8303 796.5879 1983.49 1984.11 275.26 1.008150
48 6144.314941 0.771597 843.2634 828.0468 1670.26 1670.70 277.29 1.040270
49 4941.778320 0.811253 871.4203 857.3419 1387.12 1387.43 279.13 1.069971
50 3850.913330 0.847375 897.1118 884.2660 1133.73 1133.93 280.78 1.097099
51 2887.696533 0.879657 920.1893 908.6505 909.57 909.70 282.24 1.121533
52 2063.779785 0.907884 940.5511 930.3702 713.97 714.05 283.51 1.143192
53 1385.912598 0.931940 958.1477 949.3494 546.06 546.11 284.60 1.162039
54 855.361755 0.951822 972.9868 965.5672 404.72 404.74 285.52 1.178087
55 467.333588 0.967645 985.1399 979.0633 288.55 288.57 286.27 1.191403
56 210.393890 0.979663 994.7472 989.9435 195.85 195.85 286.88 1.202112
57 65.889244 0.988270 1002.0236 998.3854 124.48 124.48 287.34 1.210406
58 7.367743 0.994019 1007.2639 1004.6437 71.89 71.89 287.68 1.216546
59 0.000000 0.997630 1010.8487 1009.0563 34.97 34.97 287.92 1.220871
60 0.000000 1.000000 1013.2500 1012.0494 10.00 10.00 288.09 1.223803