| 1 | subroutine calc_cpp_mugaz |
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| 2 | |
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| 3 | !================================================================== |
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| 4 | ! Purpose |
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| 5 | ! ------- |
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| 6 | ! Check to see if the atmospheric specific heat capacity and |
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| 7 | ! mean molar mass for the gas mixture defined in gases.def |
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| 8 | ! corresponds to what we're using. If it doesn't, abort run |
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| 9 | ! unless option 'check_cpp_match' is set to false in |
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| 10 | ! callphys.def. |
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| 11 | ! |
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| 12 | ! Authors |
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| 13 | ! ------- |
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| 14 | ! Robin Wordsworth (2009) |
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| 15 | ! A. Spiga: make the routine OK with latest changes in rcm1d |
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| 16 | ! |
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| 17 | !================================================================== |
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| 18 | |
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| 19 | use gases_h |
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| 20 | use comcstfi_mod, only: cpp, mugaz |
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| 21 | use callkeys_mod, only: check_cpp_match,force_cpp |
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| 22 | implicit none |
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| 23 | |
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| 24 | real cpp_c |
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| 25 | real mugaz_c |
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| 26 | |
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| 27 | integer igas |
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| 28 | |
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| 29 | cpp_c = 0.0 |
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| 30 | mugaz_c = 0.0 |
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| 31 | |
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| 32 | |
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| 33 | ! compute mugaz |
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| 34 | do igas=1,ngasmx |
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| 35 | |
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| 36 | ! all values at 300 K from Engineering Toolbox |
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| 37 | if(igas.eq.igas_N2)then |
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| 38 | mugaz_c = mugaz_c + 28.01*gfrac(igas,nivref) |
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| 39 | elseif(igas.eq.igas_H2)then |
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| 40 | mugaz_c = mugaz_c + 2.01*gfrac(igas,nivref) |
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| 41 | elseif(igas.eq.igas_CH4)then |
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| 42 | mugaz_c = mugaz_c + 16.04*gfrac(igas,nivref) |
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| 43 | else |
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| 44 | print*,'Error in calc_cpp_mugaz: Gas species not recognised!' |
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| 45 | call abort |
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| 46 | endif |
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| 47 | enddo |
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| 48 | |
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| 49 | !compute cpp |
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| 50 | do igas=1,ngasmx |
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| 51 | |
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| 52 | ! all values at 300 K from Engineering Toolbox |
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| 53 | if(igas.eq.igas_N2)then |
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| 54 | cpp_c = cpp_c + 1.040*gfrac(igas,nivref)*28.01/mugaz_c |
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| 55 | elseif(igas.eq.igas_H2)then |
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| 56 | cpp_c = cpp_c + 14.31*gfrac(igas,nivref)*2.01/mugaz_c |
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| 57 | elseif(igas.eq.igas_CH4)then |
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| 58 | cpp_c = cpp_c + 2.226*gfrac(igas,nivref)*16.04/mugaz_c |
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| 59 | else |
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| 60 | print*,'Error in calc_cpp_mugaz: Gas species not recognised!' |
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| 61 | call abort |
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| 62 | endif |
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| 63 | enddo |
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| 64 | |
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| 65 | cpp_c = 1000.0*cpp_c |
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| 66 | |
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| 67 | print*,'Cp in calc_cpp_mugaz is ',cpp_c,'J kg^-1 K^-1' |
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| 68 | print*,'Mg in calc_cpp_mugaz is ',mugaz_c,'amu' |
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| 69 | print*,'Predefined Cp in physics is ',cpp,'J kg^-1 K^-1' |
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| 70 | print*,'Predefined Mg in physics is ',mugaz,'amu' |
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| 71 | |
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| 72 | if (check_cpp_match) then |
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| 73 | print*,'REQUEST TO CHECK cpp_match :' |
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| 74 | if((abs(1.-cpp/cpp_c).gt.1.e-6) .or. & |
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| 75 | (abs(1.-mugaz/mugaz_c).gt.1.e-6)) then |
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| 76 | ! Ehouarn: tolerate a small mismatch between computed/stored values |
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| 77 | print*,'--> Values do not match!' |
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| 78 | print*,' Either adjust cpp / mugaz via newstart to calculated values,' |
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| 79 | print*,' or set check_cpp_match to .false. in callphys.def.' |
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| 80 | stop |
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| 81 | else |
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| 82 | print*,'--> OK. Settings match composition.' |
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| 83 | endif |
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| 84 | endif |
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| 85 | |
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| 86 | if (.not.force_cpp) then |
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| 87 | print*,'*** Setting cpp & mugaz to computations in calc_cpp_mugaz.' |
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| 88 | mugaz = mugaz_c |
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| 89 | cpp = cpp_c |
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| 90 | else |
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| 91 | print*,'*** Setting cpp & mugaz to predefined values.' |
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| 92 | endif |
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| 93 | |
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| 94 | |
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| 95 | return |
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| 96 | end subroutine calc_cpp_mugaz |
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