L91 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:

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

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