| 1 | ! Fortran module for computation of aerosol opacities |
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| 2 | ! author : Antoine Bierjon, November 2022 |
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| 3 | |
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| 4 | MODULE aeropt_mod |
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| 5 | |
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| 6 | IMPLICIT NONE |
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| 7 | |
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| 8 | integer,save :: nwvl ! Number of wavelengths in the domain (VIS or IR) |
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| 9 | integer,save :: nsize ! Number of particle sizes stored in the file |
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| 10 | real,dimension(:),save,allocatable :: wvl ! Wavelength axis [m] |
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| 11 | real,dimension(:),save,allocatable :: radiusdyn ! Particle size axis [m] |
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| 12 | real,dimension(:,:),save,allocatable :: Qext ! Extinction efficiency coefficient [/] |
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| 13 | real,dimension(:,:),save,allocatable :: omeg ! Single scattering albedo [/] |
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| 14 | |
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| 15 | integer,save :: aeroptlogfileID = 100 ! Log file's unit ID |
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| 16 | |
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| 17 | CONTAINS |
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| 18 | |
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| 19 | !******************************************************************************* |
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| 20 | SUBROUTINE read_optpropfile(datadir,optpropfile) |
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| 21 | !============================================================================== |
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| 22 | ! Purpose: |
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| 23 | ! Read optical properties from ASCII file given as input |
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| 24 | ! and store them in Fortran arrays |
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| 25 | !============================================================================== |
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| 26 | |
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| 27 | use netcdf |
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| 28 | |
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| 29 | implicit none |
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| 30 | |
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| 31 | !============================================================================== |
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| 32 | ! Arguments: |
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| 33 | !============================================================================== |
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| 34 | character(len=256), intent(in) :: datadir ! directory containing the ASCII file |
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| 35 | character(len=128), intent(in) :: optpropfile ! name of the ASCII optical properties file |
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| 36 | |
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| 37 | ! No intent(out) arguments, since only aeropt_mod module variable are updated |
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| 38 | ! by this subroutine : wvl,radiusdyn,Qext,omeg |
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| 39 | |
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| 40 | !============================================================================== |
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| 41 | ! Local variables: |
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| 42 | !============================================================================== |
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| 43 | logical :: file_ok ! to know if the file can be opened |
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| 44 | integer :: file_unit = 60 ! ASCII file ID |
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| 45 | integer :: jfile ! ASCII file scan index |
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| 46 | logical :: endwhile ! Reading loop boolean |
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| 47 | character(len=132) :: scanline ! ASCII file scanning line |
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| 48 | integer :: read_ok ! to know if the line is well read |
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| 49 | integer :: iwvl,isize ! Wavelength and Particle size loop indices |
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| 50 | |
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| 51 | !============================================================================== |
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| 52 | ! aeropt_mod module variables used here: |
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| 53 | !============================================================================== |
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| 54 | ! nwvl,nsize,wvl,radiusdyn,Qext,omeg |
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| 55 | |
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| 56 | !========================================================================== |
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| 57 | ! 1. Open the ASCII file |
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| 58 | !========================================================================== |
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| 59 | INQUIRE(FILE=trim(datadir)//'/'//trim(optpropfile),EXIST=file_ok) |
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| 60 | if(.not.file_ok) then |
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| 61 | write(*,*)'Problem opening ',trim(optpropfile) |
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| 62 | write(*,*)'It should be in: ',trim(datadir) |
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| 63 | stop |
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| 64 | endif |
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| 65 | OPEN(UNIT=file_unit,FILE=trim(datadir)//'/'//trim(optpropfile),FORM='formatted') |
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| 66 | |
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| 67 | !========================================================================== |
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| 68 | ! 2. Retrieve the optical properties' dimensions |
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| 69 | !========================================================================== |
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| 70 | jfile = 1 |
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| 71 | endwhile = .false. |
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| 72 | DO WHILE (.NOT.endwhile) |
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| 73 | READ(file_unit,*,iostat=read_ok) scanline |
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| 74 | if (read_ok.ne.0) then |
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| 75 | write(*,*)'Error reading file ',& |
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| 76 | trim(datadir)//'/'//trim(optpropfile) |
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| 77 | stop |
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| 78 | endif |
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| 79 | IF ((scanline(1:1).ne.'#').and.(scanline(1:1).ne.' ')) THEN |
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| 80 | BACKSPACE(file_unit) |
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| 81 | reading1_seq: SELECT CASE (jfile) ! FIRST READING SEQUENCE |
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| 82 | CASE(1) reading1_seq ! nwvl ---------------------------- |
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| 83 | read(file_unit,*,iostat=read_ok) nwvl |
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| 84 | if (read_ok.ne.0) then |
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| 85 | write(*,*)'reading1_seq: Error while reading line: ',& |
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| 86 | trim(scanline) |
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| 87 | write(*,*)' of file ',& |
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| 88 | trim(datadir)//'/'//trim(optpropfile) |
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| 89 | stop |
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| 90 | endif |
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| 91 | jfile = jfile+1 |
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| 92 | CASE(2) reading1_seq ! nsize --------------------------- |
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| 93 | read(file_unit,*,iostat=read_ok) nsize |
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| 94 | if (read_ok.ne.0) then |
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| 95 | write(*,*)'reading1_seq: Error while reading line: ',& |
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| 96 | trim(scanline) |
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| 97 | write(*,*)' of file ',& |
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| 98 | trim(datadir)//'/'//trim(optpropfile) |
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| 99 | stop |
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| 100 | endif |
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| 101 | endwhile = .true. |
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| 102 | CASE DEFAULT reading1_seq ! default -------------------- |
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| 103 | write(*,*) 'reading1_seq: ',& |
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| 104 | 'Error while loading optical properties.' |
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| 105 | stop |
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| 106 | END SELECT reading1_seq ! ============================== |
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| 107 | ENDIF |
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| 108 | ENDDO ! DO WHILE(.NOT.endwhile) |
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| 109 | |
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| 110 | write(*,*) "nwvl=",nwvl," ; nsize=",nsize |
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| 111 | |
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| 112 | ALLOCATE(wvl(nwvl)) ! Wavelength axis |
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| 113 | ALLOCATE(radiusdyn(nsize)) ! Aerosol radius axis |
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| 114 | ALLOCATE(Qext(nwvl,nsize)) ! Extinction efficiency coeff |
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| 115 | ALLOCATE(omeg(nwvl,nsize)) ! Single scattering albedo |
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| 116 | |
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| 117 | !========================================================================== |
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| 118 | ! 3. Retrieve the optical properties |
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| 119 | !========================================================================== |
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| 120 | jfile = 1 |
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| 121 | endwhile = .false. |
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| 122 | DO WHILE (.NOT.endwhile) |
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| 123 | READ(file_unit,*) scanline |
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| 124 | IF ((scanline(1:1).ne.'#').and.(scanline(1:1).ne.' ')) THEN |
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| 125 | BACKSPACE(file_unit) |
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| 126 | reading2_seq: SELECT CASE (jfile) ! SECOND READING SEQUENCE |
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| 127 | CASE(1) reading2_seq ! wvl ----------------------------- |
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| 128 | read(file_unit,*,iostat=read_ok) wvl |
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| 129 | if (read_ok.ne.0) then |
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| 130 | write(*,*)'reading2_seq: Error while reading line: ',& |
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| 131 | trim(scanline) |
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| 132 | write(*,*)' of file ',& |
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| 133 | trim(datadir)//'/'//trim(optpropfile) |
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| 134 | stop |
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| 135 | endif |
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| 136 | jfile = jfile+1 |
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| 137 | CASE(2) reading2_seq ! radiusdyn ----------------------- |
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| 138 | read(file_unit,*,iostat=read_ok) radiusdyn |
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| 139 | if (read_ok.ne.0) then |
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| 140 | write(*,*)'reading2_seq: Error while reading line: ',& |
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| 141 | trim(scanline) |
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| 142 | write(*,*)' of file ',& |
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| 143 | trim(datadir)//'/'//trim(optpropfile) |
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| 144 | stop |
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| 145 | endif |
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| 146 | jfile = jfile+1 |
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| 147 | CASE(3) reading2_seq ! Qext ---------------------------- |
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| 148 | isize = 1 |
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| 149 | DO WHILE (isize .le. nsize) |
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| 150 | READ(file_unit,*,iostat=read_ok) scanline |
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| 151 | if (read_ok.ne.0) then |
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| 152 | write(*,*)'reading2_seq: Error while reading line: ',& |
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| 153 | trim(scanline) |
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| 154 | write(*,*)' of file ',& |
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| 155 | trim(datadir)//'/'//trim(optpropfile) |
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| 156 | stop |
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| 157 | endif |
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| 158 | IF ((scanline(1:1).ne.'#').and.(scanline(1:1).ne.' ')) THEN |
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| 159 | BACKSPACE(file_unit) |
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| 160 | read(file_unit,*) Qext(:,isize) |
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| 161 | isize = isize + 1 |
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| 162 | ENDIF |
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| 163 | ENDDO |
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| 164 | jfile = jfile+1 |
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| 165 | CASE(4) reading2_seq ! omeg ---------------------------- |
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| 166 | isize = 1 |
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| 167 | DO WHILE (isize .le. nsize) |
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| 168 | READ(file_unit,*,iostat=read_ok) scanline |
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| 169 | if (read_ok.ne.0) then |
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| 170 | write(*,*)'reading2_seq: Error while reading line: ',& |
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| 171 | trim(scanline) |
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| 172 | write(*,*)' of file ',& |
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| 173 | trim(datadir)//'/'//trim(optpropfile) |
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| 174 | stop |
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| 175 | endif |
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| 176 | IF ((scanline(1:1).ne.'#').and.(scanline(1:1).ne.' ')) THEN |
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| 177 | BACKSPACE(file_unit) |
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| 178 | read(file_unit,*) omeg(:,isize) |
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| 179 | isize = isize + 1 |
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| 180 | ENDIF |
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| 181 | ENDDO |
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| 182 | endwhile = .true. |
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| 183 | CASE DEFAULT reading2_seq ! default -------------------- |
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| 184 | write(*,*) 'reading2_seq: ',& |
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| 185 | 'Error while loading optical properties.' |
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| 186 | stop |
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| 187 | END SELECT reading2_seq ! ============================== |
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| 188 | ENDIF |
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| 189 | ENDDO |
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| 190 | |
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| 191 | ! Close the file |
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| 192 | CLOSE(file_unit) |
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| 193 | |
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| 194 | write(*,*)"" |
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| 195 | write(*,*) "Wavelength array loaded from file ",trim(datadir)//'/'//trim(optpropfile) |
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| 196 | write(*,*) "ranging from ",wvl(1)," to ",wvl(nwvl)," meters" |
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| 197 | write(*,*) "Effective radius array loaded from file ",trim(datadir)//'/'//trim(optpropfile) |
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| 198 | write(*,*) "ranging from ",radiusdyn(1)," to ",radiusdyn(nsize)," meters" |
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| 199 | |
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| 200 | |
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| 201 | END SUBROUTINE read_optpropfile |
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| 202 | |
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| 203 | |
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| 204 | !******************************************************************************* |
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| 205 | |
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| 206 | SUBROUTINE interp_wvl_reff(wvl_val,reff_val,missval,& |
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| 207 | Qext_val,omeg_val) |
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| 208 | !============================================================================== |
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| 209 | ! Purpose: |
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| 210 | ! Interpolate the optical properties to a given wavelength and effective radius |
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| 211 | ! from properties tables |
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| 212 | !============================================================================== |
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| 213 | |
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| 214 | use netcdf |
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| 215 | |
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| 216 | implicit none |
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| 217 | |
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| 218 | !============================================================================== |
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| 219 | ! Arguments: |
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| 220 | !============================================================================== |
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| 221 | real, intent(in) :: wvl_val ! Reference wavelength [m] |
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| 222 | real, intent(in) :: reff_val ! Input reff [m] |
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| 223 | real, intent(in) :: missval ! Value to put in outfile when the reff is out of bounds |
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| 224 | |
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| 225 | real, intent(out) :: Qext_val ! Qext after both interpolations |
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| 226 | real, intent(out) :: omeg_val ! omega after both interpolations |
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| 227 | |
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| 228 | |
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| 229 | !============================================================================== |
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| 230 | ! Local variables: |
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| 231 | !============================================================================== |
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| 232 | integer :: iwvl,isize ! Wavelength and Particle size loop indices |
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| 233 | integer :: iwvl1,iwvl2,isize1,isize2 ! Wavelength and Particle size indices for the interpolation |
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| 234 | real :: coeff ! Interpolation coefficient |
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| 235 | real,dimension(2) :: reffQext ! Qext after reff interpolation |
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| 236 | real,dimension(2) :: reffomeg ! omeg after reff interpolation |
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| 237 | |
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| 238 | !============================================================================== |
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| 239 | ! aeropt_mod module variables used here: |
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| 240 | !============================================================================== |
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| 241 | ! nwvl,nsize,wvl,radiusdyn,Qext,omeg,aeroptlogfileID |
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| 242 | |
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| 243 | !========================================================================== |
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| 244 | ! 1. Get the optpropfile wavelength values encompassing the ref wavelength |
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| 245 | !========================================================================== |
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| 246 | iwvl=1 |
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| 247 | DO WHILE ((iwvl.lt.nwvl).and.(wvl(iwvl).lt.wvl_val)) |
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| 248 | iwvl=iwvl+1 |
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| 249 | ENDDO |
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| 250 | if ((wvl(nwvl).lt.wvl_val).or.(wvl(1).gt.wvl_val)) then |
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| 251 | write(*,*) "ERROR: the reference wavelength (",wvl_val,"m) is out of the bounds" |
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| 252 | write(*,*) "of the optical properties' tables" |
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| 253 | write(*,*) "(wvl_inf=",wvl(1),"m ; wvl_sup=",wvl(nwvl),"m)" |
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| 254 | write(*,*) "Ensure you wrote it well (in meters)," |
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| 255 | write(*,*) "or supply new optical properties' tables." |
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| 256 | stop |
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| 257 | endif |
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| 258 | if (wvl(iwvl).eq.wvl_val) then |
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| 259 | ! if the ref wavelength is in the optpropfile |
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| 260 | iwvl1 = iwvl |
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| 261 | iwvl2 = iwvl |
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| 262 | else ! wvl(iwvl)>wvl_val and wvl(iwvl-1)<wvl_val |
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| 263 | iwvl1 = iwvl-1 |
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| 264 | iwvl2 = iwvl |
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| 265 | endif |
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| 266 | |
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| 267 | !========================================================================== |
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| 268 | ! 2. Get the optpropfile reff values encompassing the input reff |
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| 269 | !========================================================================== |
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| 270 | |
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| 271 | isize=1 |
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| 272 | DO WHILE ((isize.lt.nsize).and.(radiusdyn(isize).lt.reff_val)) |
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| 273 | isize=isize+1 |
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| 274 | ENDDO |
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| 275 | |
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| 276 | if (reff_val.eq.missval) then |
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| 277 | ! if the effective radius is a missing value, |
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| 278 | ! put a missing value for the optical properties |
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| 279 | Qext_val = missval |
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| 280 | omeg_val = missval |
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| 281 | ! write(*,*) "reff missing value detected" |
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| 282 | |
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| 283 | else if ((radiusdyn(nsize).lt.reff_val).or.(radiusdyn(1).gt.reff_val)) then |
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| 284 | write(aeroptlogfileID,*) "WARNING: the effective radius (",reff_val,"m) is out of the bounds" |
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| 285 | write(aeroptlogfileID,*) "of the optical properties' tables" |
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| 286 | write(aeroptlogfileID,*) "(reff_inf=",radiusdyn(1),"m ; reff_sup=",radiusdyn(nsize),"m)" |
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| 287 | write(aeroptlogfileID,*) "A missing value will be written for optical properties." |
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| 288 | |
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| 289 | Qext_val = missval |
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| 290 | omeg_val = missval |
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| 291 | |
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| 292 | else |
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| 293 | |
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| 294 | !========================================================================== |
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| 295 | ! 3. Interpolate the properties |
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| 296 | !========================================================================== |
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| 297 | if (radiusdyn(isize).eq.reff_val) then |
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| 298 | ! if the user reff is exactly in the optpropfile |
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| 299 | isize1 = isize |
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| 300 | isize2 = isize |
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| 301 | else ! radius(isize)>reff and radiusdyn(isize-1)<reff |
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| 302 | isize1 = isize-1 |
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| 303 | isize2 = isize |
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| 304 | endif |
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| 305 | |
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| 306 | ! Qext COMPUTATION |
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| 307 | ! Linear interpolation in effective radius |
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| 308 | if (isize2.ne.isize1) then |
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| 309 | coeff = (reff_val-radiusdyn(isize1))/(radiusdyn(isize2)-radiusdyn(isize1)) |
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| 310 | else |
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| 311 | coeff = 0. |
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| 312 | endif |
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| 313 | reffQext(1) = Qext(iwvl1,isize1)+coeff*(Qext(iwvl1,isize2)-Qext(iwvl1,isize1)) |
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| 314 | reffQext(2) = Qext(iwvl2,isize1)+coeff*(Qext(iwvl2,isize2)-Qext(iwvl2,isize1)) |
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| 315 | ! Linear interpolation in wavelength |
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| 316 | if (iwvl2.ne.iwvl1) then |
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| 317 | coeff = (wvl_val-wvl(iwvl1))/(wvl(iwvl2)-wvl(iwvl1)) |
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| 318 | else |
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| 319 | coeff = 0. |
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| 320 | endif |
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| 321 | Qext_val = reffQext(1)+coeff*(reffQext(2)-reffQext(1)) |
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| 322 | |
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| 323 | |
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| 324 | ! omeg COMPUTATION |
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| 325 | ! Linear interpolation in effective radius |
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| 326 | if (isize2.ne.isize1) then |
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| 327 | coeff = (reff_val-radiusdyn(isize1))/(radiusdyn(isize2)-radiusdyn(isize1)) |
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| 328 | else |
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| 329 | coeff = 0. |
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| 330 | endif |
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| 331 | reffomeg(1) = omeg(iwvl1,isize1)+coeff*(omeg(iwvl1,isize2)-omeg(iwvl1,isize1)) |
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| 332 | reffomeg(2) = omeg(iwvl2,isize1)+coeff*(omeg(iwvl2,isize2)-omeg(iwvl2,isize1)) |
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| 333 | ! Linear interpolation in wavelength |
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| 334 | if (iwvl2.ne.iwvl1) then |
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| 335 | coeff = (wvl_val-wvl(iwvl1))/(wvl(iwvl2)-wvl(iwvl1)) |
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| 336 | else |
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| 337 | coeff = 0. |
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| 338 | endif |
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| 339 | omeg_val = reffomeg(1)+coeff*(reffomeg(2)-reffomeg(1)) |
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| 340 | |
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| 341 | endif |
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| 342 | |
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| 343 | END SUBROUTINE interp_wvl_reff |
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| 344 | |
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| 345 | !******************************************************************************* |
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| 346 | SUBROUTINE end_aeropt_mod |
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| 347 | !============================================================================== |
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| 348 | ! Purpose: |
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| 349 | ! Deallocate module variables |
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| 350 | !============================================================================== |
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| 351 | |
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| 352 | implicit none |
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| 353 | |
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| 354 | !============================================================================== |
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| 355 | ! aeropt_mod module variables used here: |
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| 356 | !============================================================================== |
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| 357 | ! wvl,radiusdyn,Qext,omeg |
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| 358 | |
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| 359 | if (allocated(wvl)) deallocate(wvl) |
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| 360 | if (allocated(radiusdyn)) deallocate(radiusdyn) |
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| 361 | if (allocated(Qext)) deallocate(Qext) |
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| 362 | if (allocated(omeg)) deallocate(omeg) |
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| 363 | |
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| 364 | END SUBROUTINE end_aeropt_mod |
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| 365 | |
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| 366 | !******************************************************************************* |
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| 367 | SUBROUTINE create_logfile(filename) |
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| 368 | !============================================================================== |
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| 369 | ! Purpose: |
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| 370 | ! Deallocate module variables |
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| 371 | !============================================================================== |
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| 372 | |
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| 373 | implicit none |
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| 374 | |
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| 375 | !============================================================================== |
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| 376 | ! Arguments: |
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| 377 | !============================================================================== |
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| 378 | character(len=128),intent(in) :: filename ! name of the aeropt log file |
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| 379 | !============================================================================== |
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| 380 | ! aeropt_mod module variables used here: |
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| 381 | !============================================================================== |
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| 382 | ! aeroptlogfileID |
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| 383 | |
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| 384 | ! Create output file |
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| 385 | write(*,*) "Creating aeropt log file: ",trim(filename) |
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| 386 | write(*,*) "It will overwrite any existing file with the same name." |
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| 387 | OPEN(UNIT=aeroptlogfileID,FILE=trim(filename),FORM='formatted',STATUS='replace') |
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| 388 | ! NB: STATUS='replace' will overwrite any existing file with the same name |
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| 389 | |
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| 390 | END SUBROUTINE create_logfile |
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| 391 | |
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| 392 | !******************************************************************************* |
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| 393 | |
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| 394 | END MODULE aeropt_mod |
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