What is hya£¨A one-dimensional array equal to the hybrid A coefficients. Must be unitless£©£¿

Hello everybody:
     Recently, I want to interpolation pressure-levels to isentropic-levels.
     But now, I am puzzled on the function pres_hybrid_ccm(ps, p0, hya, hyb). The explain of hya and hyb is that a one-dimensional array equal to the hybrid A(B) coefficients. Must be unitless.
     In model output have hya and hyb automatical, but in Reanalysis Data without these paramters. Can anybody tell me how to setting the hya and hyb?
     Thanks!
             Jin Dachao
             2012/03/19
 ;****************************************************************
     Follow are the hya and hyb of CAM's output data. And I can't understand of it.
 ;****************************************************************
 Variable: hya
Type: double
Total Size: 208 bytes
            26 values
Number of Dimensions: 1
Dimensions and sizes: [lev | 26]
Coordinates:
            lev: [3.54463800000001..992.5560999999998]
Number Of Attributes: 1
  long_name : hybrid A coefficient at layer midpoints
(0) 0.00354463800000001
(1) 0.007388813500000008
(2) 0.01396721400000001
(3) 0.023944625
(4) 0.03723029000000011
(5) 0.0531146050000002
(6) 0.07005915000000029
(7) 0.07791257000000029
(8) 0.07660701000000025
(9) 0.07507108500000026
(10) 0.07326415000000019
(11) 0.07113838500000003
(12) 0.06863753499999992
(13) 0.06569541499999998
(14) 0.06223415500000007
(15) 0.05816216500000015
(16) 0.05337168000000014
(17) 0.04773592500000012
(18) 0.04110575500000002
(19) 0.03330569999999999
(20) 0.02496844000000004
(21) 0.01709591000000002
(22) 0.01021471000000002
(23) 0.004803175000000007
(24) 0.00126068
(25) 0
 
 
Variable: hyb
Type: double
Total Size: 208 bytes
            26 values
Number of Dimensions: 1
Dimensions and sizes: [lev | 26]
Coordinates:
            lev: [3.54463800000001..992.5560999999998]
Number Of Attributes: 1
  long_name : hybrid B coefficient at layer midpoints
(0) 0
(1) 0
(2) 0
(3) 0
(4) 0
(5) 0
(6) 0
(7) 0.007526545000000023
(8) 0.02390768500000004
(9) 0.04317925
(10) 0.06585124500000028
(11) 0.09252368500000041
(12) 0.1239024000000004
(13) 0.1608178500000004
(14) 0.2042470000000001
(15) 0.2553391000000005
(16) 0.3154463000000014
(17) 0.386159300000001
(18) 0.4693495000000016
(19) 0.5672185000000027
(20) 0.6718278500000032
(21) 0.7706061500000025
(22) 0.8569460500000012
(23) 0.9248457000000023
(24) 0.9692941500000014
(25) 0.9925560999999998

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Received on Mon Mar 19 03:59:58 2012