L40 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:

 

 

 

 

 

 

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 2000.000000 0.000000 20.0000 10.0000 31054.95 31207.11 227.70 0.015299
2 4000.000000 0.000000 40.0000 30.0000 23848.75 23938.39 220.50 0.047396
3 6000.000000 0.000000 60.0000 50.0000 20576.18 20642.87 217.23 0.080184
4 8000.000000 0.000000 80.0000 70.0000 18441.83 18495.38 216.65 0.112556
5 9988.882838 0.000197 100.0886 90.0443 16844.92 16889.59 216.65 0.144786
6 11914.524469 0.001511 120.6766 110.3826 15553.41 15591.49 216.65 0.177489
7 13722.942942 0.004884 142.1783 131.4274 14446.75 14479.60 216.65 0.211328
8 15369.730856 0.011076 164.9202 153.5493 13460.18 13488.69 216.65 0.246899
9 16819.476269 0.020678 189.1466 177.0334 12557.63 12582.44 216.65 0.284660
10 18045.183587 0.034121 215.0251 202.0859 11718.27 11739.87 216.65 0.324943
11 19027.694476 0.051690 242.6522 228.8387 10930.02 10948.81 217.10 0.367189
12 19755.108757 0.073534 272.0592 257.3557 10175.26 10191.54 222.01 0.403822
13 20222.205309 0.099675 303.2174 287.6383 9444.61 9458.63 226.76 0.441886
14 20429.862967 0.130023 336.0439 319.6307 8737.51 8749.51 231.36 0.481280
15 20384.481428 0.164384 370.4072 353.2256 8054.20 8064.40 235.80 0.521847
16 20097.402147 0.202476 406.1328 388.2700 7395.38 7403.97 240.08 0.563389
17 19584.329243 0.243933 443.0085 424.5707 6761.89 6769.08 244.20 0.605674
18 18864.750393 0.288323 480.7907 461.8996 6154.67 6160.62 248.14 0.648445
19 17961.357741 0.335155 519.2093 500.0000 5574.58 5579.46 251.92 0.691426
20 16899.468794 0.383892 557.9734 538.5913 5022.43 5026.39 255.50 0.734331
21 15706.447321 0.433963 596.7774 577.3754 4498.91 4502.09 258.91 0.776863
22 14411.124261 0.484772 635.3061 616.0417 4004.59 4007.11 262.12 0.818729
23 13043.218618 0.535710 673.2403 654.2732 3539.96 3541.93 265.14 0.859634
24 11632.758364 0.586168 710.2627 691.7515 3105.35 3106.86 267.97 0.899295
25 10209.501340 0.635547 746.0635 728.1631 2701.00 2702.14 270.59 0.937436
26 8802.356155 0.683269 780.3455 763.2045 2327.04 2327.89 273.02 0.973801
27 7438.803092 0.728786 812.8302 796.5879 1983.49 1984.11 275.26 1.008150
28 6144.315003 0.771597 843.2634 828.0468 1670.26 1670.70 277.29 1.040269
29 4941.778213 0.811253 871.4203 857.3419 1387.12 1387.43 279.13 1.069971
30 3850.913422 0.847375 897.1117 884.2660 1133.73 1133.93 280.78 1.097099
31 2887.696603 0.879657 920.1893 908.6505 909.57 909.70 282.24 1.121533
32 2063.779905 0.907884 940.5512 930.3702 713.97 714.05 283.51 1.143192
33 1385.912553 0.931940 958.1476 949.3494 546.06 546.11 284.60 1.162039
34 855.361750 0.951822 972.9868 965.5672 404.72 404.74 285.52 1.178087
35 467.333577 0.967645 985.1399 979.0633 288.55 288.57 286.27 1.191403
36 210.393894 0.979663 994.7472 989.9435 195.85 195.85 286.88 1.202112
37 65.889243 0.988270 1002.0236 998.3854 124.48 124.48 287.34 1.210406
38 7.367743 0.994019 1007.2639 1004.6437 71.89 71.89 287.68 1.216546
39 0.000000 0.997630 1010.8487 1009.0563 34.97 34.97 287.92 1.220871
40 0.000000 1.000000 1013.2500 1012.0493 10.00 10.00 288.09 1.223803

A description of how model levels should be interpreted is available here.