| 1 | subroutine setspi |
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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 | ! Set up spectral intervals and Planck function in the longwave. |
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| 8 | ! |
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| 9 | ! Authors |
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| 10 | ! ------- |
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| 11 | ! Adapted from setspi in the NASA Ames radiative code by |
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| 12 | ! Robin Wordsworth (2009). |
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| 13 | ! |
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| 14 | ! Called by |
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| 15 | ! --------- |
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| 16 | ! callcorrk.F |
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| 17 | ! |
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| 18 | ! Calls |
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| 19 | ! ----- |
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| 20 | ! none |
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| 21 | ! |
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| 22 | !================================================================== |
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| 23 | |
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| 24 | use radinc_h, only: L_NSPECTI,corrkdir,banddir,NTstar,NTstop,NTfac |
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| 25 | use radcommon_h, only: BWNI,BLAMI,WNOI,DWNI,WAVEI,planckir,sigma |
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| 26 | use datafile_mod, only: datadir |
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| 27 | |
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| 28 | implicit none |
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| 29 | |
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| 30 | #include "callkeys.h" |
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| 31 | #include "comcstfi.h" |
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| 32 | |
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| 33 | logical file_ok |
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| 34 | integer nw, nt, m, mm, file_entries |
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| 35 | real*8 a, b, ans, y, bpa, bma, T, dummy |
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| 36 | |
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| 37 | character(len=30) :: temp1 |
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| 38 | character(len=200) :: file_id |
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| 39 | character(len=200) :: file_path |
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| 40 | |
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| 41 | ! C1 and C2 values from Goody and Yung (2nd edition) MKS units |
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| 42 | ! These values lead to a "sigma" (sigma*T^4) of 5.67032E-8 W m^-2 K^-4 |
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| 43 | |
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| 44 | real*8 :: c1 = 3.741832D-16 ! W m^-2 |
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| 45 | real*8 :: c2 = 1.438786D-2 ! m K |
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| 46 | |
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| 47 | real*8 :: lastband(2), plancksum |
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| 48 | |
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| 49 | !! used to count lines |
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| 50 | integer :: nb |
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| 51 | integer :: ierr |
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| 52 | |
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| 53 | logical forceEC, planckcheck |
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| 54 | |
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| 55 | real*8 :: x(12) = [ -0.981560634246719D0, -0.904117256370475D0, & |
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| 56 | -0.769902674194305D0, -0.587317954286617D0, & |
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| 57 | -0.367831498998180D0, -0.125233408511469D0, & |
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| 58 | 0.125233408511469D0, 0.367831498998180D0, & |
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| 59 | 0.587317954286617D0, 0.769902674194305D0, & |
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| 60 | 0.904117256370475D0, 0.981560634246719D0 ] |
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| 61 | |
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| 62 | real*8 :: w(12) = [ 0.047175336386512D0, 0.106939325995318D0, & |
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| 63 | 0.160078328543346D0, 0.203167426723066D0, & |
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| 64 | 0.233492536538355D0, 0.249147045813403D0, & |
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| 65 | 0.249147045813403D0, 0.233492536538355D0, & |
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| 66 | 0.203167426723066D0, 0.160078328543346D0, & |
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| 67 | 0.106939325995318D0, 0.047175336386512D0 ] |
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| 68 | mm=0 |
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| 69 | |
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| 70 | forceEC=.true. |
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| 71 | planckcheck=.true. |
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| 72 | |
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| 73 | !======================================================================= |
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| 74 | ! Set up spectral bands - wavenumber [cm^(-1)]. Go from smaller to |
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| 75 | ! larger wavenumbers. |
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| 76 | |
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| 77 | write(temp1,'(i2.2)') L_NSPECTI |
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| 78 | !file_id='/corrk_data/' // corrkdir(1:LEN_TRIM(corrkdir)) // '/narrowbands_IR.in' |
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| 79 | file_id='/corrk_data/'//trim(adjustl(banddir))//'/narrowbands_IR.in' |
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| 80 | file_path=TRIM(datadir)//TRIM(file_id) |
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| 81 | |
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| 82 | ! check that the file exists |
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| 83 | inquire(FILE=file_path,EXIST=file_ok) |
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| 84 | if(.not.file_ok) then |
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| 85 | write(*,*)'The file ',TRIM(file_path) |
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| 86 | write(*,*)'was not found by setspi.F90, exiting.' |
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| 87 | write(*,*)'Check that your path to datagcm:',trim(datadir) |
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| 88 | write(*,*)' is correct. You can change it in callphys.def with:' |
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| 89 | write(*,*)' datadir = /absolute/path/to/datagcm' |
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| 90 | write(*,*)'Also check that the corrkdir you chose in callphys.def exists.' |
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| 91 | call abort |
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| 92 | endif |
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| 93 | |
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| 94 | nb=0 |
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| 95 | ierr=0 |
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| 96 | ! check that the file contains the right number of bands |
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| 97 | open(131,file=file_path,form='formatted') |
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| 98 | read(131,*,iostat=ierr) file_entries |
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| 99 | do while (ierr==0) |
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| 100 | read(131,*,iostat=ierr) dummy |
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| 101 | ! write(*,*) 'setspi: file_entries:',dummy,'ierr=',ierr |
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| 102 | if (ierr==0) nb=nb+1 |
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| 103 | enddo |
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| 104 | close(131) |
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| 105 | |
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| 106 | write(*,*) 'setspi: L_NSPECTI = ',L_NSPECTI, 'in the model ' |
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| 107 | write(*,*) ' there are ',nb, 'entries in ',TRIM(file_path) |
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| 108 | if(nb.ne.L_NSPECTI) then |
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| 109 | write(*,*) 'MISMATCH !! I stop here' |
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| 110 | call abort |
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| 111 | endif |
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| 112 | |
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| 113 | ! load and display the data |
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| 114 | open(111,file=file_path,form='formatted') |
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| 115 | read(111,*) |
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| 116 | do M=1,L_NSPECTI-1 |
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| 117 | read(111,*) BWNI(M) |
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| 118 | end do |
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| 119 | read(111,*) lastband |
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| 120 | close(111) |
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| 121 | BWNI(L_NSPECTI) =lastband(1) |
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| 122 | BWNI(L_NSPECTI+1)=lastband(2) |
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| 123 | |
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| 124 | print*,'' |
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| 125 | print*,'setspi: IR band limits:' |
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| 126 | do M=1,L_NSPECTI+1 |
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| 127 | print*,m,'-->',BWNI(M),' cm^-1' |
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| 128 | end do |
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| 129 | |
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| 130 | ! Set up mean wavenumbers and wavenumber deltas. Units of |
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| 131 | ! wavenumbers is cm^(-1); units of wavelengths is microns. |
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| 132 | |
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| 133 | do M=1,L_NSPECTI |
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| 134 | WNOI(M) = 0.5D0*(BWNI(M+1)+BWNI(M)) |
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| 135 | DWNI(M) = BWNI(M+1)-BWNI(M) |
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| 136 | WAVEI(M) = 1.0D+4/WNOI(M) |
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| 137 | BLAMI(M) = 0.01D0/BWNI(M) |
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| 138 | end do |
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| 139 | BLAMI(M) = 0.01D0/BWNI(M) |
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| 140 | ! note M=L_NSPECTI+1 after loop due to Fortran bizarreness |
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| 141 | |
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| 142 | !======================================================================= |
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| 143 | ! For each IR wavelength interval, compute the integral of B(T), the |
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| 144 | ! Planck function, divided by the wavelength interval, in cm-1. The |
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| 145 | ! integration is in MKS units, the final answer is the same as the |
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| 146 | ! original planck.f; W m^-2 wavenumber^-1, where wavenumber is in CM^-1. |
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| 147 | |
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| 148 | print*,'' |
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| 149 | print*,'setspi: Current Planck integration range:' |
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| 150 | print*,'T = ',dble(NTstar)/NTfac, ' to ',dble(NTstop)/NTfac,' K.' |
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| 151 | |
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| 152 | do NW=1,L_NSPECTI |
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| 153 | a = 1.0D-2/BWNI(NW+1) |
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| 154 | b = 1.0D-2/BWNI(NW) |
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| 155 | bpa = (b+a)/2.0D0 |
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| 156 | bma = (b-a)/2.0D0 |
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| 157 | do nt=NTstar,NTstop |
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| 158 | T = dble(NT)/NTfac |
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| 159 | ans = 0.0D0 |
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| 160 | |
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| 161 | do mm=1,12 |
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| 162 | y = bma*x(mm)+bpa |
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| 163 | ans = ans + w(mm)*c1/(y**5*(exp(c2/(y*T))-1.0D0)) |
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| 164 | end do |
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| 165 | |
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| 166 | planckir(NW,nt-NTstar+1) = ans*bma/(PI*DWNI(NW)) |
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| 167 | end do |
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| 168 | end do |
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| 169 | |
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| 170 | ! force planck=sigma*eps*T^4 for each temperature in array |
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| 171 | if(forceEC)then |
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| 172 | print*,'setspi: Force F=sigma*eps*T^4 for all values of T!' |
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| 173 | do nt=NTstar,NTstop |
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| 174 | plancksum=0.0D0 |
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| 175 | T=dble(NT)/NTfac |
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| 176 | |
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| 177 | do NW=1,L_NSPECTI |
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| 178 | plancksum=plancksum+ & |
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| 179 | planckir(NW,nt-NTstar+1)*DWNI(NW)*pi |
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| 180 | end do |
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| 181 | |
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| 182 | do NW=1,L_NSPECTI |
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| 183 | planckir(NW,nt-NTstar+1)= & |
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| 184 | planckir(NW,nt-NTstar+1)* & |
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| 185 | sigma*(dble(nt)/NTfac)**4/plancksum |
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| 186 | end do |
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| 187 | end do |
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| 188 | endif |
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| 189 | |
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| 190 | if(planckcheck)then |
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| 191 | ! check energy conservation at lower temperature boundary |
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| 192 | plancksum=0.0D0 |
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| 193 | nt=NTstar |
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| 194 | do NW=1,L_NSPECTI |
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| 195 | plancksum=plancksum+planckir(NW,nt-NTstar+1)*DWNI(NW)*pi |
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| 196 | end do |
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| 197 | print*,'setspi: At lower limit:' |
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| 198 | print*,'in model sig*T^4 = ',plancksum,' W m^-2' |
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| 199 | print*,'actual sig*T^4 = ',sigma*(dble(nt)/NTfac)**4,' W m^-2' |
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| 200 | |
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| 201 | ! check energy conservation at upper temperature boundary |
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| 202 | plancksum=0.0D0 |
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| 203 | nt=NTstop |
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| 204 | do NW=1,L_NSPECTI |
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| 205 | plancksum=plancksum+planckir(NW,nt-NTstar+1)*DWNI(NW)*pi |
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| 206 | end do |
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| 207 | print*,'setspi: At upper limit:' |
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| 208 | print*,'in model sig*T^4 = ',plancksum,' W m^-2' |
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| 209 | print*,'actual sig*T^4 = ',sigma*(dble(nt)/NTfac)**4,' W m^-2' |
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| 210 | print*,'' |
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| 211 | endif |
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| 212 | |
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| 213 | return |
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| 214 | end subroutine setspi |
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