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,NTstart,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 | use comcstfi_mod, only: pi |
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28 | |
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29 | implicit none |
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30 | |
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31 | logical file_ok |
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32 | integer nw, nt, m, mm, file_entries |
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33 | real*8 a, b, ans, y, bpa, bma, T, dummy |
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34 | |
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35 | character(len=30) :: temp1 |
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36 | character(len=200) :: file_id |
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37 | character(len=200) :: file_path |
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38 | |
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39 | ! C1 and C2 values from Goody and Yung (2nd edition) MKS units |
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40 | ! These values lead to a "sigma" (sigma*T^4) of 5.67032E-8 W m^-2 K^-4 |
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41 | |
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42 | real*8 :: c1 = 3.741832D-16 ! W m^-2 |
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43 | real*8 :: c2 = 1.438786D-2 ! m K |
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44 | |
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45 | real*8 :: lastband(2), plancksum |
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46 | |
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47 | !! used to count lines |
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48 | integer :: nb |
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49 | integer :: ierr |
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50 | |
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51 | logical forceEC, planckcheck |
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52 | |
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53 | real*8 :: x(12) = [ -0.981560634246719D0, -0.904117256370475D0, & |
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54 | -0.769902674194305D0, -0.587317954286617D0, & |
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55 | -0.367831498998180D0, -0.125233408511469D0, & |
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56 | 0.125233408511469D0, 0.367831498998180D0, & |
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57 | 0.587317954286617D0, 0.769902674194305D0, & |
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58 | 0.904117256370475D0, 0.981560634246719D0 ] |
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59 | |
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60 | real*8 :: w(12) = [ 0.047175336386512D0, 0.106939325995318D0, & |
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61 | 0.160078328543346D0, 0.203167426723066D0, & |
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62 | 0.233492536538355D0, 0.249147045813403D0, & |
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63 | 0.249147045813403D0, 0.233492536538355D0, & |
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64 | 0.203167426723066D0, 0.160078328543346D0, & |
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65 | 0.106939325995318D0, 0.047175336386512D0 ] |
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66 | mm=0 |
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67 | |
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68 | forceEC=.true. |
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69 | planckcheck=.true. |
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70 | |
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71 | !======================================================================= |
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72 | ! Set up spectral bands - wavenumber [cm^(-1)]. Go from smaller to |
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73 | ! larger wavenumbers. |
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74 | |
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75 | write(temp1,'(i2.2)') L_NSPECTI |
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76 | !file_id='/corrk_data/' // corrkdir(1:LEN_TRIM(corrkdir)) // '/narrowbands_IR.in' |
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77 | file_id='/corrk_data/'//trim(adjustl(banddir))//'/narrowbands_IR.in' |
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78 | file_path=TRIM(datadir)//TRIM(file_id) |
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79 | |
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80 | ! check that the file exists |
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81 | inquire(FILE=file_path,EXIST=file_ok) |
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82 | if(.not.file_ok) then |
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83 | write(*,*)'The file ',TRIM(file_path) |
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84 | write(*,*)'was not found by setspi.F90, exiting.' |
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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 corrkdir you chose in callphys.def exists.' |
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89 | call abort |
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90 | endif |
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91 | |
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92 | !$OMP MASTER |
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93 | nb=0 |
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94 | ierr=0 |
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95 | ! check that the file contains the right number of bands |
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96 | open(131,file=file_path,form='formatted') |
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97 | read(131,*,iostat=ierr) file_entries |
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98 | do while (ierr==0) |
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99 | read(131,*,iostat=ierr) dummy |
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100 | ! write(*,*) 'setspi: file_entries:',dummy,'ierr=',ierr |
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101 | if (ierr==0) nb=nb+1 |
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102 | enddo |
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103 | close(131) |
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104 | |
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105 | write(*,*) 'setspi: L_NSPECTI = ',L_NSPECTI, 'in the model ' |
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106 | write(*,*) ' there are ',nb, 'entries in ',TRIM(file_path) |
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107 | if(nb.ne.L_NSPECTI) then |
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108 | write(*,*) 'MISMATCH !! I stop here' |
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109 | call abort |
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110 | endif |
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111 | |
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112 | ! load and display the data |
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113 | open(111,file=file_path,form='formatted') |
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114 | read(111,*) |
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115 | do M=1,L_NSPECTI-1 |
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116 | read(111,*) BWNI(M) |
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117 | end do |
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118 | read(111,*) lastband |
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119 | close(111) |
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120 | BWNI(L_NSPECTI) =lastband(1) |
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121 | BWNI(L_NSPECTI+1)=lastband(2) |
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122 | !$OMP END MASTER |
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123 | !$OMP BARRIER |
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124 | |
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125 | print*,'' |
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126 | print*,'setspi: IR band limits:' |
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127 | do M=1,L_NSPECTI+1 |
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128 | print*,m,'-->',BWNI(M),' cm^-1' |
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129 | end do |
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130 | |
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131 | ! Set up mean wavenumbers and wavenumber deltas. Units of |
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132 | ! wavenumbers is cm^(-1); units of wavelengths is microns. |
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133 | |
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134 | do M=1,L_NSPECTI |
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135 | WNOI(M) = 0.5D0*(BWNI(M+1)+BWNI(M)) |
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136 | DWNI(M) = BWNI(M+1)-BWNI(M) |
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137 | WAVEI(M) = 1.0D+4/WNOI(M) |
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138 | BLAMI(M) = 0.01D0/BWNI(M) |
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139 | end do |
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140 | BLAMI(M) = 0.01D0/BWNI(M) |
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141 | ! note M=L_NSPECTI+1 after loop due to Fortran bizarreness |
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142 | |
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143 | !======================================================================= |
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144 | ! For each IR wavelength interval, compute the integral of B(T), the |
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145 | ! Planck function, divided by the wavelength interval, in cm-1. The |
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146 | ! integration is in MKS units, the final answer is the same as the |
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147 | ! original planck.f; W m^-2 wavenumber^-1, where wavenumber is in CM^-1. |
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148 | |
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149 | print*,'' |
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150 | print*,'setspi: Current Planck integration range:' |
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151 | print*,'T = ',dble(NTstart)/NTfac, ' to ',dble(NTstop)/NTfac,' K.' |
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152 | |
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153 | IF(.NOT.ALLOCATED(planckir)) ALLOCATE(planckir(L_NSPECTI,NTstop-NTstart+1)) |
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154 | |
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155 | do NW=1,L_NSPECTI |
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156 | a = 1.0D-2/BWNI(NW+1) |
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157 | b = 1.0D-2/BWNI(NW) |
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158 | bpa = (b+a)/2.0D0 |
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159 | bma = (b-a)/2.0D0 |
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160 | do nt=NTstart,NTstop |
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161 | T = dble(NT)/NTfac |
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162 | ans = 0.0D0 |
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163 | |
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164 | do mm=1,12 |
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165 | y = bma*x(mm)+bpa |
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166 | ans = ans + w(mm)*c1/(y**5*(exp(c2/(y*T))-1.0D0)) |
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167 | end do |
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168 | |
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169 | planckir(NW,nt-NTstart+1) = ans*bma/(PI*DWNI(NW)) |
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170 | end do |
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171 | end do |
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172 | |
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173 | ! force planck=sigma*eps*T^4 for each temperature in array |
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174 | if(forceEC)then |
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175 | print*,'setspi: Force F=sigma*eps*T^4 for all values of T!' |
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176 | do nt=NTstart,NTstop |
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177 | plancksum=0.0D0 |
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178 | T=dble(NT)/NTfac |
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179 | |
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180 | do NW=1,L_NSPECTI |
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181 | plancksum=plancksum+ & |
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182 | planckir(NW,nt-NTstart+1)*DWNI(NW)*pi |
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183 | end do |
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184 | |
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185 | do NW=1,L_NSPECTI |
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186 | planckir(NW,nt-NTstart+1)= & |
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187 | planckir(NW,nt-NTstart+1)* & |
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188 | sigma*(dble(nt)/NTfac)**4/plancksum |
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189 | end do |
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190 | end do |
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191 | endif |
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192 | |
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193 | if(planckcheck)then |
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194 | ! check energy conservation at lower temperature boundary |
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195 | plancksum=0.0D0 |
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196 | nt=NTstart |
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197 | do NW=1,L_NSPECTI |
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198 | plancksum=plancksum+planckir(NW,nt-NTstart+1)*DWNI(NW)*pi |
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199 | end do |
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200 | print*,'setspi: At lower limit:' |
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201 | print*,'in model sig*T^4 = ',plancksum,' W m^-2' |
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202 | print*,'actual sig*T^4 = ',sigma*(dble(nt)/NTfac)**4,' W m^-2' |
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203 | |
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204 | ! check energy conservation at upper temperature boundary |
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205 | plancksum=0.0D0 |
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206 | nt=NTstop |
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207 | do NW=1,L_NSPECTI |
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208 | plancksum=plancksum+planckir(NW,nt-NTstart+1)*DWNI(NW)*pi |
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209 | end do |
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210 | print*,'setspi: At upper limit:' |
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211 | print*,'in model sig*T^4 = ',plancksum,' W m^-2' |
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212 | print*,'actual sig*T^4 = ',sigma*(dble(nt)/NTfac)**4,' W m^-2' |
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213 | print*,'' |
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214 | endif |
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215 | |
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216 | return |
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217 | end subroutine setspi |
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