| 1 | subroutine interpolateN2CH4(wn,temp,presN2,presCH4,abcoef,firstcall,ind) |
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| 2 | |
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| 3 | !================================================================== |
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| 4 | ! |
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| 5 | ! Purpose |
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| 6 | ! ------- |
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| 7 | ! Calculates the N2-CH4 CIA opacity, using a lookup table from |
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| 8 | ! Turbet et al. 2020, Icarus, Volume 346, article id. 113762 |
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| 9 | ! |
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| 10 | ! Authors |
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| 11 | ! ------- |
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| 12 | ! M. Turbet (2023) |
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| 13 | ! |
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| 14 | !================================================================== |
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| 15 | |
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| 16 | use datafile_mod, only: datadir |
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| 17 | implicit none |
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| 18 | |
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| 19 | ! input |
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| 20 | double precision wn ! wavenumber (cm^-1) |
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| 21 | double precision temp ! temperature (Kelvin) |
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| 22 | double precision presN2 ! N2 partial pressure (Pascals) |
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| 23 | double precision presCH4 ! CH4 partial pressure (Pascals) |
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| 24 | |
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| 25 | ! output |
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| 26 | double precision abcoef ! absorption coefficient (m^-1) |
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| 27 | |
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| 28 | integer nS,nT |
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| 29 | parameter(nS=240) |
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| 30 | parameter(nT=6) |
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| 31 | double precision, parameter :: losch = 2.6867774e19 |
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| 32 | ! Loschmit's number (molecule cm^-3 at STP) |
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| 33 | ! converts cm^5 molecule^-2 --> cm^-1 amagat^-2 |
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| 34 | ! see Richard et al. 2011, JQSRT for details |
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| 35 | |
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| 36 | double precision amagatN2 |
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| 37 | double precision amagatCH4 |
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| 38 | double precision wn_arr(nS) |
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| 39 | double precision temp_arr(nT) |
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| 40 | double precision abs_arr(nS,nT) |
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| 41 | |
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| 42 | integer k,iT |
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| 43 | logical firstcall |
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| 44 | |
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| 45 | save wn_arr, temp_arr, abs_arr !read by master |
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| 46 | |
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| 47 | character*100 dt_file |
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| 48 | integer strlen,ios |
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| 49 | |
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| 50 | character(LEN=*), parameter :: fmat1 = "(A21,F10.3,F10.3,I7,F7.1,E10.3,F5.3)" |
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| 51 | |
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| 52 | character*21 bleh |
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| 53 | double precision blah, Ttemp |
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| 54 | integer nres |
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| 55 | integer ind |
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| 56 | |
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| 57 | if(temp.gt.600)then |
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| 58 | print*,'Your temperatures are too high for this N2-CH4 CIA dataset.' |
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| 59 | print*,'Please run mixed N2-CH4 atmospheres below T = 600 K.' |
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| 60 | stop |
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| 61 | endif |
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| 62 | |
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| 63 | if(temp.lt.100)then |
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| 64 | print*,'Your temperatures are too low for this N2-CH4 CIA dataset.' |
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| 65 | print*,'Please run mixed N2-CH4 atmospheres above T = 100 K.' |
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| 66 | stop |
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| 67 | endif |
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| 68 | |
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| 69 | amagatN2 = (273.15/temp)*(presN2/101325.0) |
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| 70 | amagatCH4 = (273.15/temp)*(presCH4/101325.0) |
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| 71 | |
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| 72 | if(firstcall)then ! called by sugas_corrk only |
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| 73 | print*,'----------------------------------------------------' |
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| 74 | print*,'Initialising N2-CH4 continuum from Turbet et al. 2020' |
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| 75 | |
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| 76 | ! 1.1 Open the ASCII files |
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| 77 | dt_file=TRIM(datadir)//'/continuum_data/N2-CH4_TURBET2020.cia' |
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| 78 | |
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| 79 | |
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| 80 | !$OMP MASTER |
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| 81 | open(33,file=dt_file,form='formatted',status='old',iostat=ios) |
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| 82 | if (ios.ne.0) then ! file not found |
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| 83 | write(*,*) 'Error from interpolateN2CH4' |
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| 84 | write(*,*) 'Data file ',trim(dt_file),' not found.' |
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| 85 | write(*,*) 'Check that your path to datagcm:',trim(datadir) |
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| 86 | write(*,*) 'is correct. You can change it in callphys.def with:' |
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| 87 | write(*,*) 'datadir = /absolute/path/to/datagcm' |
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| 88 | write(*,*) 'Also check that the continuum data continuum_data/N2-CH4_TURBET2020.cia is there.' |
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| 89 | call abort |
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| 90 | else |
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| 91 | |
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| 92 | do iT=1,nT |
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| 93 | |
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| 94 | read(33,fmat1) bleh,blah,blah,nres,Ttemp |
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| 95 | if(nS.ne.nres)then |
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| 96 | print*,'Resolution given in file: ',trim(dt_file) |
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| 97 | print*,'is ',nres,', which does not match nS.' |
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| 98 | print*,'Please adjust nS value in interpolateN2CH4.F90' |
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| 99 | stop |
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| 100 | endif |
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| 101 | temp_arr(iT)=Ttemp |
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| 102 | |
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| 103 | do k=1,nS |
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| 104 | read(33,*) wn_arr(k),abs_arr(k,it) |
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| 105 | write(*,*) 'for k = ', k, ' we have ', wn_arr(k),abs_arr(k,it) |
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| 106 | end do |
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| 107 | |
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| 108 | end do |
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| 109 | |
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| 110 | endif |
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| 111 | close(33) |
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| 112 | !$OMP END MASTER |
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| 113 | !$OMP BARRIER |
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| 114 | |
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| 115 | print*,'interpolateN2CH4: At wavenumber ',wn,' cm^-1' |
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| 116 | print*,' temperature ',temp,' K' |
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| 117 | print*,' N2 partial pressure ',presN2,' Pa' |
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| 118 | print*,' and CH4 partial pressure ',presCH4,' Pa' |
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| 119 | |
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| 120 | endif |
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| 121 | |
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| 122 | call bilinearbig(nS,nT,wn_arr,temp_arr,abs_arr,wn,temp,abcoef,ind) |
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| 123 | |
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| 124 | ! print*,'the absorption is ',abcoef,' cm^5 molecule^-2' |
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| 125 | ! print*,'or ',abcoef*losch**2,' cm^-1 amagat^-2' |
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| 126 | |
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| 127 | abcoef=abcoef*100.0*amagatN2*amagatCH4 ! convert to m^-1 |
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| 128 | |
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| 129 | ! print*,'We have ',amagatN2,' amagats of N2' |
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| 130 | ! print*,'and ',amagaCH4,' amagats of CH4' |
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| 131 | ! print*,'So the absorption is ',abcoef,' m^-1' |
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| 132 | |
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| 133 | |
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| 134 | ! unlike for Rayleigh scattering, we do not currently weight by the BB function |
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| 135 | ! however our bands are normally thin, so this is no big deal. |
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| 136 | |
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| 137 | |
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| 138 | return |
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| 139 | end subroutine interpolateN2CH4 |
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| 140 | |
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