| 1 | subroutine interpolateH2Ocont(wn,temp,presS,presF,abcoef,firstcall) |
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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 H2O continuum opacity, using a lookup table from |
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| 8 | ! Clough (2005) |
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| 9 | ! |
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| 10 | ! Authors |
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| 11 | ! ------- |
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| 12 | ! R. Wordsworth (2011) |
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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 presS ! self-pressure (Pascals) |
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| 23 | double precision presF ! foreign (air) 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=1001) |
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| 30 | parameter(nT=11) |
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| 31 | |
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| 32 | double precision kB |
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| 33 | parameter(kB=1.3806488e-23) |
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| 34 | |
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| 35 | double precision amagatS, amagatF, abcoefS, abcoefF, Nmolec |
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| 36 | double precision wn_arr(nS) |
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| 37 | double precision temp_arr(nT) |
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| 38 | double precision abs_arrS(nS,nT) |
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| 39 | double precision abs_arrF(nS,nT) |
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| 40 | double precision data_tmp(nT) |
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| 41 | |
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| 42 | integer k |
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| 43 | logical firstcall |
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| 44 | |
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| 45 | save wn_arr, temp_arr, abs_arrS, abs_arrF |
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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 | amagatS=(273.15/temp)*(presS/101325.0) |
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| 51 | amagatF=(273.15/temp)*(presF/101325.0) |
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| 52 | |
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| 53 | if(firstcall)then ! called by sugas_corrk only |
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| 54 | print*,'----------------------------------------------------' |
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| 55 | print*,'Initialising H2O continuum from MT_CKD data...' |
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| 56 | |
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| 57 | ! 1.1 Open the ASCII files |
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| 58 | |
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| 59 | ! nu array |
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| 60 | dt_file=TRIM(datadir)//'/continuum_data/H2O_CONT_NU.dat' |
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| 61 | open(33,file=dt_file,form='formatted',status='old',iostat=ios) |
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| 62 | if (ios.ne.0) then ! file not found |
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| 63 | write(*,*) 'Error from interpolateH2O_cont' |
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| 64 | write(*,*) 'Data file ',trim(dt_file),' not found.' |
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| 65 | write(*,*)'Check that your path to datagcm:',trim(datadir) |
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| 66 | write(*,*)' is correct. You can change it in callphys.def with:' |
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| 67 | write(*,*)' datadir = /absolute/path/to/datagcm' |
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| 68 | write(*,*)' Also check that there is a continuum_data/H2O_CONT_NU.dat there.' |
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| 69 | call abort |
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| 70 | else |
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| 71 | do k=1,nS |
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| 72 | read(33,*) wn_arr(k) |
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| 73 | enddo |
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| 74 | endif |
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| 75 | close(33) |
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| 76 | |
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| 77 | ! self broadening |
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| 78 | dt_file=TRIM(datadir)//'/continuum_data/H2O_CONT_SELF.dat' |
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| 79 | open(34,file=dt_file,form='formatted',status='old',iostat=ios) |
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| 80 | if (ios.ne.0) then ! file not found |
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| 81 | write(*,*) 'Error from interpolateH2O_cont' |
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| 82 | write(*,*) 'Data file ',trim(dt_file),' not found.' |
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| 83 | write(*,*)'Check that your path to datagcm:',trim(datadir) |
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| 84 | write(*,*)' is correct. You can change it in callphys.def with:' |
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| 85 | write(*,*)' datadir = /absolute/path/to/datagcm' |
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| 86 | write(*,*)' Also check that there is a continuum_data/H2O_CONT_SELF.dat there.' |
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| 87 | call abort |
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| 88 | else |
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| 89 | do k=1,nS |
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| 90 | read(34,*) data_tmp |
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| 91 | abs_arrS(k,1:nT)=data_tmp(1:nT) |
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| 92 | end do |
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| 93 | endif |
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| 94 | close(34) |
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| 95 | |
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| 96 | ! foreign (N2+O2+Ar) broadening |
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| 97 | dt_file=TRIM(datadir)//'/continuum_data/H2O_CONT_FOREIGN.dat' |
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| 98 | open(35,file=dt_file,form='formatted',status='old',iostat=ios) |
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| 99 | if (ios.ne.0) then ! file not found |
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| 100 | write(*,*) 'Error from interpolateH2O_cont' |
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| 101 | write(*,*) 'Data file ',trim(dt_file),' not found.' |
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| 102 | write(*,*)'Check that your path to datagcm:',trim(datadir) |
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| 103 | write(*,*)' is correct. You can change it in callphys.def with:' |
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| 104 | write(*,*)' datadir = /absolute/path/to/datagcm' |
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| 105 | write(*,*)' Also check that there is a continuum_data/H2O_CONT_FOREIGN.dat there.' |
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| 106 | call abort |
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| 107 | else |
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| 108 | do k=1,nS |
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| 109 | read(35,*) data_tmp |
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| 110 | abs_arrF(k,1:nT)=data_tmp(1:nT) |
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| 111 | end do |
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| 112 | endif |
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| 113 | close(35) |
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| 114 | |
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| 115 | temp_arr(1) = 200. |
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| 116 | temp_arr(2) = 250. |
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| 117 | temp_arr(3) = 300. |
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| 118 | temp_arr(4) = 350. |
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| 119 | temp_arr(5) = 400. |
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| 120 | temp_arr(6) = 450. |
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| 121 | temp_arr(7) = 500. |
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| 122 | temp_arr(8) = 550. |
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| 123 | temp_arr(9) = 600. |
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| 124 | temp_arr(10) = 650. |
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| 125 | temp_arr(11) = 700. |
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| 126 | |
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| 127 | print*,'interpolateH2Ocont: At wavenumber ',wn,' cm^-1' |
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| 128 | print*,' temperature ',temp,' K' |
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| 129 | print*,' H2O pressure ',presS,' Pa' |
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| 130 | print*,' air pressure ',presF,' Pa' |
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| 131 | |
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| 132 | call bilinearH2Ocont(wn_arr,temp_arr,abs_arrS,wn,temp,abcoefS) |
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| 133 | print*,'the self absorption is ',abcoefS,' cm^2 molecule^-1' |
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| 134 | |
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| 135 | call bilinearH2Ocont(wn_arr,temp_arr,abs_arrF,wn,temp,abcoefF) |
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| 136 | print*,'the foreign absorption is ',abcoefF,' cm^2 molecule^-1' |
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| 137 | |
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| 138 | print*,'We have ',amagatS,' amagats of H2O vapour' |
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| 139 | print*,'and ',amagatF,' amagats of air' |
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| 140 | |
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| 141 | abcoef = abcoefS*amagatS + abcoefF*amagatF ! Eq. (15) in Clough (1989) |
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| 142 | |
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| 143 | Nmolec = (presS+presF)/(kB*temp) |
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| 144 | |
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| 145 | print*,'Total number of molecules per m^3 is',Nmolec |
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| 146 | |
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| 147 | abcoef = abcoef*Nmolec/(100.0**2) ! convert to m^-1 |
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| 148 | abcoef = abcoef*(presS/(presF+presS)) ! take H2O mixing ratio into account |
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| 149 | |
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| 150 | print*,'So the total absorption is ',abcoef,' m^-1' |
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| 151 | print*,'And optical depth / km : ',1000.0*abcoef |
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| 152 | |
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| 153 | else |
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| 154 | |
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| 155 | call bilinearH2Ocont(wn_arr,temp_arr,abs_arrS,wn,temp,abcoefS) |
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| 156 | call bilinearH2Ocont(wn_arr,temp_arr,abs_arrF,wn,temp,abcoefF) |
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| 157 | |
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| 158 | abcoef = abcoefS*amagatS + abcoefF*amagatF ! Eq. (15) in Clough (1989) |
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| 159 | |
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| 160 | !abcoef = (presS/100000.0)*3.0e-24 |
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| 161 | !print*,'Matsui TEST' |
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| 162 | |
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| 163 | Nmolec = (presS+presF)/(kB*temp) ! sure this is correct?? |
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| 164 | abcoef = abcoef*Nmolec/(100.0**2) ! convert to m^-1 |
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| 165 | abcoef = abcoef*(presS/(presF+presS)) ! take H2O mixing ratio into account |
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| 166 | |
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| 167 | |
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| 168 | ! unlike for Rayleigh scattering, we do not currently weight by the BB function |
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| 169 | ! however our bands are normally thin, so this is no big deal. |
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| 170 | |
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| 171 | |
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| 172 | endif |
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| 173 | |
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| 174 | return |
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| 175 | end subroutine interpolateH2Ocont |
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| 176 | |
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| 177 | |
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| 178 | |
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| 179 | |
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| 180 | !------------------------------------------------------------------------- |
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| 181 | subroutine bilinearH2Ocont(x_arr,y_arr,f2d_arr,x_in,y_in,f) |
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| 182 | ! Necessary for interpolation of continuum data |
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| 183 | |
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| 184 | implicit none |
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| 185 | |
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| 186 | integer nX,nY,i,j,a,b |
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| 187 | parameter(nX=1001) |
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| 188 | parameter(nY=11) |
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| 189 | |
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| 190 | real*8 x_in,y_in,x,y,x1,x2,y1,y2 |
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| 191 | real*8 f,f11,f12,f21,f22,fA,fB |
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| 192 | real*8 x_arr(nX) |
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| 193 | real*8 y_arr(nY) |
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| 194 | real*8 f2d_arr(nX,nY) |
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| 195 | |
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| 196 | integer strlen |
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| 197 | character*100 label |
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| 198 | label='subroutine bilinear' |
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| 199 | |
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| 200 | x=x_in |
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| 201 | y=y_in |
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| 202 | |
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| 203 | ! 1st check we're within the wavenumber range |
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| 204 | if ((x.lt.x_arr(2)).or.(x.gt.x_arr(nX-2))) then |
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| 205 | f=0.0D+0 |
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| 206 | return |
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| 207 | else |
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| 208 | |
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| 209 | ! in the x (wavenumber) direction 1st |
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| 210 | i=1 |
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| 211 | 10 if (i.lt.(nX+1)) then |
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| 212 | if (x_arr(i).gt.x) then |
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| 213 | x1=x_arr(i-1) |
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| 214 | x2=x_arr(i) |
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| 215 | a=i-1 |
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| 216 | i=9999 |
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| 217 | endif |
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| 218 | i=i+1 |
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| 219 | goto 10 |
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| 220 | endif |
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| 221 | endif |
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| 222 | |
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| 223 | if ((y.lt.y_arr(1)).or.(y.gt.y_arr(nY))) then |
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| 224 | write(*,*) 'Warning from bilinearH2Ocont:' |
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| 225 | write(*,*) 'Outside continuum temperature range!' |
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| 226 | if(y.lt.y_arr(1))then |
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| 227 | y=y_arr(1)+0.01 |
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| 228 | endif |
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| 229 | if(y.gt.y_arr(nY))then |
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| 230 | y=y_arr(nY)-0.01 |
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| 231 | endif |
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| 232 | else |
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| 233 | |
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| 234 | ! in the y (temperature) direction 2nd |
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| 235 | j=1 |
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| 236 | 20 if (j.lt.(nY+1)) then |
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| 237 | if (y_arr(j).gt.y) then |
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| 238 | y1=y_arr(j-1) |
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| 239 | y2=y_arr(j) |
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| 240 | b=j-1 |
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| 241 | j=9999 |
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| 242 | endif |
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| 243 | j=j+1 |
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| 244 | goto 20 |
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| 245 | endif |
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| 246 | endif |
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| 247 | |
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| 248 | f11=f2d_arr(a,b) |
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| 249 | f21=f2d_arr(a+1,b) |
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| 250 | f12=f2d_arr(a,b+1) |
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| 251 | f22=f2d_arr(a+1,b+1) |
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| 252 | |
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| 253 | ! 1st in x-direction |
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| 254 | fA=f11*(x2-x)/(x2-x1)+f21*(x-x1)/(x2-x1) |
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| 255 | fB=f12*(x2-x)/(x2-x1)+f22*(x-x1)/(x2-x1) |
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| 256 | |
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| 257 | ! then in y-direction |
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| 258 | f=fA*(y2-y)/(y2-y1)+fB*(y-y1)/(y2-y1) |
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| 259 | |
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| 260 | return |
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| 261 | end subroutine bilinearH2Ocont |
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