[ncl-talk] ncep cfsr: hybrid a / hybrid a

Mon Jun 4 16:44:16 MDT 2018

   You did not give any information on the source dataset you are using.
   Hence, hard to answer.
   Maybe the following will help:

   Source: https://rda.ucar.edu/datasets/ds093.1/docs/FAQs_hrly_
   timeseries.html

   The Climate Forecast System uses a hybrid vertical coordinate that is
   defined by:
      Pk = Ak + Bk*Psfc
      where Pk is the pressure at level k, and Psfc is the surface pressure
   The values of Ak and Bk (units are Pa) are given in the following table:
      kAB
      0 0.0 1.0
      1 0.0 0.99467117 (This is Hybrid Level 1)
      2 0.57499999 0.99862660
      3 5.7410002 0.98174226
      4 21.516001 0.97386760
      5 55.712002 0.96482760
      6 116.89900 0.95443410
      7 214.01500 0.94249105
      8 356.22299 0.92879730
      9 552.71997 0.91315103
      10 812.48901 0.89535499
      11 1143.9880 0.87522358
      12 1554.7889 0.85259068
      13 2051.1499 0.82731885
      14 2637.5530 0.79930973
      15 3316.2170 0.76851469
      16 4086.6140 0.73494524
      17 4945.0288 0.69868290
      18 5884.2061 0.65988702
      19 6893.1172 0.61879963
      20 7956.9082 0.57574666
      21 9057.0508 0.53113484
      22 10171.712 0.48544332
      23 11276.348 0.43921080
      24 12344.490 0.39301825
      25 13348.671 0.34746850
      26 14261.435 0.30316412
      27 15056.342 0.26068544
      28 15708.893 0.22057019
      29 16197.315 0.18329623
      30 16503.145 0.14926878
      31 16611.604 0.11881219
      32 16511.736 0.092166908
      33 16197.967 0.069474578
      34 15683.489 0.050646842
      35 14993.074 0.035441618
      36 14154.316 0.023555880
      37 13197.065 0.014637120
      38 12152.937 0.082940198
      39 11054.853 0.041067102
      40 9936.6143 0.016359100
      41 8832.5371 0.0043106001
      42 7777.1499 0.00036969999
      43 6804.8740 0.0
      44 5937.0498 0.0
      45 5167.1460 0.0
      46 4485.4932 0.0
      47 3883.0520 0.0
      48 3351.4600 0.0
      49 2883.0381 0.0
      50 2470.7881 0.0
      51 2108.3660 0.0
      52 1790.0510 0.0
      53 1510.7111 0.0
      54 1265.7520 0.0
      55 1051.0800 0.0
      56 863.05798 0.0
      57 698.45697 0.0
      58 554.42401 0.0
      59 428.43399 0.0
      60 318.26599 0.0
      61 221.95799 0.0
      62 137.78999 0.0
      63 64.247002 0.0
      64 0.0 0.0

On Mon, Jun 4, 2018 at 2:33 PM, Matt Masarik <mattmasarik at boisestate.edu>
wrote:

> I'm interested in plotting PV on isentropic surfaces from the NCEP CFSRR
> (reforecast) data set.  I'm planning to interpolate variables to isentropes
> using (http://www.ncl.ucar.edu/Applications/Scripts/isent_1.ncl) and then
> calculate PV on those surfaces using (http://www.ncl.ucar.edu/
> Document/Functions/Contributed/pot_vort_hybrid.shtml).
>
> A helper function in there (pres_hybrid_ccm) requires Hybrid A and Hybrid
> B coefficients for mid- model levels.  I haven't been able to find anything
> for these constants in CFS on www..  Can someone point me to how I can find
> these?
>
> Thank you,
> Matt
>
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