| 1 | subroutine albedocaps(zls,ngrid,piceco2,psolaralb,emisref) |
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| 2 | |
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| 3 | ! routine which changes the albedo (and emissivity) of the surface |
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| 4 | ! depending on the presence of CO2 ice on the surface |
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| 5 | |
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| 6 | ! to use the 'getin' routine |
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| 7 | use ioipsl_getincom |
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| 8 | |
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| 9 | implicit none |
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| 10 | |
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| 11 | #include"dimensions.h" |
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| 12 | #include"dimphys.h" |
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| 13 | #include"surfdat.h" |
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| 14 | |
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| 15 | ! arguments: |
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| 16 | real,intent(in) :: zls ! solar longitude (rad) |
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| 17 | integer,intent(in) :: ngrid |
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| 18 | real,intent(in) :: piceco2(ngrid) ! amount of CO2 ice on the surface (kg/m2) |
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| 19 | real,intent(out) :: psolaralb(ngrid,2) ! albedo of the surface |
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| 20 | real,intent(out) :: emisref(ngrid) ! emissivity of the surface |
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| 21 | |
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| 22 | |
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| 23 | ! local variables: |
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| 24 | logical,save :: firstcall=.true. |
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| 25 | integer :: ig,icap |
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| 26 | |
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| 27 | ! 1. Initializations |
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| 28 | if (firstcall) then |
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| 29 | ! find out if user wants to use TES cap albedoes or not |
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| 30 | TESicealbedo=.false. ! default value |
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| 31 | write(*,*)" albedocaps: Use TES Cap albedoes ?" |
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| 32 | call getin("TESicealbedo",TESicealbedo) |
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| 33 | write(*,*)" albedocaps: TESicealbedo = ",TESicealbedo |
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| 34 | |
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| 35 | ! if using TES albedoes, load coeffcients |
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| 36 | if (TESicealbedo) then |
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| 37 | write(*,*)" albedocaps: Coefficient for Northern Cap ?" |
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| 38 | TESice_Ncoef=1.0 ! default value |
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| 39 | call getin("TESice_Ncoef",TESice_Ncoef) |
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| 40 | write(*,*)" albedocaps: TESice_Ncoef = ",TESice_Ncoef |
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| 41 | |
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| 42 | write(*,*)" albedocaps: Coefficient for Southern Cap ?" |
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| 43 | TESice_Scoef=1.0 ! default value |
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| 44 | call getin("TESice_Scoef",TESice_Scoef) |
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| 45 | write(*,*)" albedocaps: TESice_Scoef = ",TESice_Scoef |
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| 46 | endif |
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| 47 | |
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| 48 | firstcall=.false. |
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| 49 | endif ! of if (firstcall) |
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| 50 | |
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| 51 | do ig=1,ngrid |
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| 52 | if (ig.gt.ngrid/2+1) then |
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| 53 | icap=2 ! Southern hemisphere |
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| 54 | else |
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| 55 | icap=1 ! Northern hemisphere |
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| 56 | endif |
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| 57 | |
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| 58 | if (piceco2(ig).gt.0) then |
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| 59 | ! set emissivity of surface to be the ice emissivity |
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| 60 | emisref(ig)=emisice(icap) |
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| 61 | ! set the surface albedo to be the ice albedo |
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| 62 | if (TESicealbedo) then |
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| 63 | ! write(*,*) "albedocaps: call TES_icecap_albedo" |
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| 64 | ! write(*,*) "albedocaps: zls=",zls," ig=",ig |
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| 65 | call TES_icecap_albedo(zls,ig,psolaralb(ig,1)) |
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| 66 | ! write(*,*) "albedocaps: psolaralb(ig,1)=",psolaralb(ig,1) |
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| 67 | psolaralb(ig,2)=psolaralb(ig,1) |
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| 68 | else |
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| 69 | psolaralb(ig,1)=albedice(icap) |
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| 70 | psolaralb(ig,2)=albedice(icap) |
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| 71 | endif |
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| 72 | else |
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| 73 | ! set emissivity of surface to be bare ground emissivity |
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| 74 | emisref(ig)=emissiv |
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| 75 | ! set the surface albedo to bare ground albedo |
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| 76 | psolaralb(ig,1)=albedodat(ig) |
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| 77 | psolaralb(ig,2)=albedodat(ig) |
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| 78 | endif ! of if (piceco2(ig).gt.0) |
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| 79 | enddo ! of ig=1,ngrid |
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| 80 | |
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| 81 | end subroutine albedocaps |
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| 82 | |
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| 83 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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| 84 | subroutine TES_icecap_albedo(zls,ig,alb) |
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| 85 | |
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| 86 | implicit none |
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| 87 | #include"dimensions.h" |
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| 88 | #include"dimphys.h" |
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| 89 | #include"surfdat.h" |
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| 90 | #include"comgeomfi.h" |
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| 91 | #include"netcdf.inc" |
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| 92 | #include"datafile.h" |
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| 93 | |
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| 94 | ! arguments: |
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| 95 | real,intent(in) :: zls ! solar longitude (rad) |
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| 96 | integer,intent(in) :: ig ! grid point index |
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| 97 | real,intent(out) :: alb ! (interpolated) TES ice albedo at that grid point |
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| 98 | |
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| 99 | ! local variables: |
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| 100 | logical,save :: firstcall=.true. |
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| 101 | real,save :: zls_old ! value of zls from a previous call |
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| 102 | integer,save :: tinf,tsup ! encompassing time indexes of TES data |
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| 103 | real,save :: reltime ! relative position in-between time indexes (in [0;1]) |
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| 104 | integer :: latinf,latsup ! encompassing latitude indexes of TES data |
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| 105 | real :: rellat ! relative position in-between latitude indexes (in[0;1]) |
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| 106 | integer :: loninf,lonsup ! encompassing longitude indexes of TES data |
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| 107 | real :: rellon !relative position in-between longitude indexes (in[0;1]) |
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| 108 | real,save :: pi,radeg ! to convert radians to degrees |
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| 109 | real :: zlsd ! solar longitude, in degrees |
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| 110 | real :: latd ! latitude, in degrees |
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| 111 | real :: lond ! longitude, in degrees |
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| 112 | integer :: i |
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| 113 | integer :: icap ! =1: Northern hemisphere =2: Southern hemisphere |
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| 114 | |
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| 115 | ! TES datasets: (hard coded fixed length/sizes; for now) |
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| 116 | integer,parameter :: TESlonsize=72 |
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| 117 | real,parameter :: TESdeltalon=5.0 ! step in longitude in TES files |
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| 118 | ! longitudes, in TES files, in degrees, from TESlon(1)=-177.5 to TESlon(72)=177.5 |
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| 119 | real,save :: TESlon(TESlonsize) |
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| 120 | integer,parameter :: TESlatsize=30 |
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| 121 | real,parameter :: TESdeltalat=2.0 ! step in latitude in TES files |
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| 122 | ! latitudes (north hemisphere file), in degrees, from TESlatn(1)=31, |
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| 123 | ! to TESlatn(30)=89 ; TESlatn(8)=45 |
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| 124 | real,parameter :: TESlatnmin=45. ! minimum TES latitude (North hemisphere) |
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| 125 | real,parameter :: TESlatsmax=-45. ! maximum TES latitude (South hemisphere) |
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| 126 | real,save :: TESlatn(TESlatsize) |
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| 127 | ! latitudes (south hemisphere file), in degrees, from TESlats(1)=-89, |
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| 128 | ! to TESlats(30)=-31 ; TESlats(23)=-45 |
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| 129 | real,save :: TESlats(TESlatsize) |
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| 130 | integer,parameter :: TESlssize=72 |
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| 131 | real,parameter :: TESdeltals=5.0 ! step in solar longitude in TES files |
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| 132 | ! Solar longitude in TES files, TESls(1)=2.5 to TESls(72)=357.5 |
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| 133 | real,save :: TESls(TESlssize) |
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| 134 | ! TES North albedo (=-1 for missing values) |
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| 135 | real,save :: TESalbn(TESlonsize,TESlatsize,TESlssize) |
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| 136 | ! TES South albedo (=-1 for missing values) |
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| 137 | real,save :: TESalbs(TESlonsize,TESlatsize,TESlssize) |
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| 138 | ! encompassing nodes arranged as follow : 4 3 |
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| 139 | real :: val(4) ! 1 2 |
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| 140 | |
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| 141 | !NetCDF variables: |
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| 142 | integer :: ierr ! NetCDF status |
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| 143 | integer :: nid ! NetCDF file ID |
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| 144 | integer :: nvarid ! NetCDF variable ID |
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| 145 | |
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| 146 | ! 0. Preliminary stuff |
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| 147 | if (firstcall) then |
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| 148 | ! Load TES albedoes for Northern Hemisphere |
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| 149 | ! Note: datafile() is defined in "datafile.h" |
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| 150 | ierr=NF_OPEN(trim(datafile)//"/npsc_albedo.nc",NF_NOWRITE,nid) |
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| 151 | IF (ierr.NE.NF_NOERR) THEN |
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| 152 | write(*,*)'Problem opening npsc_albedo.nc (phymars/albedocaps.F90)' |
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| 153 | write(*,*)'It should be in :',trim(datafile),'/' |
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| 154 | write(*,*)'1) You can change this directory address in ' |
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| 155 | write(*,*)' file phymars/datafile.h' |
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| 156 | write(*,*)'2) If necessary, npsc_albedo.nc (and other datafiles)' |
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| 157 | write(*,*)' can be obtained online on:' |
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| 158 | write(*,*)' http://www.lmd.jussieu.fr/~forget/datagcm/datafile' |
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| 159 | CALL ABORT |
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| 160 | ENDIF |
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| 161 | |
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| 162 | ierr=NF_INQ_VARID(nid,"longitude",nvarid) |
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| 163 | if (ierr.ne.NF_NOERR) then |
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| 164 | write(*,*) "Failed to find longitude in file!" |
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| 165 | else |
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| 166 | ierr=NF_GET_VAR_REAL(nid,nvarid,TESlon) |
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| 167 | endif |
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| 168 | |
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| 169 | ierr=NF_INQ_VARID(nid,"latitude",nvarid) |
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| 170 | if (ierr.ne.NF_NOERR) then |
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| 171 | write(*,*) "Failed to find latitude in file!" |
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| 172 | else |
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| 173 | ierr=NF_GET_VAR_REAL(nid,nvarid,TESlatn) |
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| 174 | endif |
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| 175 | |
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| 176 | ierr=NF_INQ_VARID(nid,"time",nvarid) |
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| 177 | if (ierr.ne.NF_NOERR) then |
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| 178 | write(*,*) "Failed to find time in file!" |
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| 179 | else |
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| 180 | ierr=NF_GET_VAR_REAL(nid,nvarid,TESls) |
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| 181 | endif |
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| 182 | |
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| 183 | ierr=NF_INQ_VARID(nid,"albedo",nvarid) |
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| 184 | if (ierr.ne.NF_NOERR) then |
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| 185 | write(*,*) "Failed to find albedo in file!" |
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| 186 | else |
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| 187 | ierr=NF_GET_VAR_REAL(nid,nvarid,TESalbn) |
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| 188 | endif |
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| 189 | |
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| 190 | ! Load albedoes for Southern Hemisphere |
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| 191 | ierr=NF_OPEN(trim(datafile)//"/spsc_albedo.nc",NF_NOWRITE,nid) |
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| 192 | IF (ierr.NE.NF_NOERR) THEN |
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| 193 | write(*,*)'Problem opening spsc_albedo.nc (phymars/albedocaps.F90)' |
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| 194 | write(*,*)'It should be in :',trim(datafile),'/' |
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| 195 | write(*,*)'1) You can change this directory address in ' |
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| 196 | write(*,*)' file phymars/datafile.h' |
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| 197 | write(*,*)'2) If necessary, spsc_albedo.nc (and other datafiles)' |
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| 198 | write(*,*)' can be obtained online on:' |
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| 199 | write(*,*)' http://www.lmd.jussieu.fr/~forget/datagcm/datafile' |
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| 200 | CALL ABORT |
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| 201 | ENDIF |
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| 202 | |
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| 203 | ierr=NF_INQ_VARID(nid,"latitude",nvarid) |
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| 204 | if (ierr.ne.NF_NOERR) then |
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| 205 | write(*,*) "Failed to find latitude in file!" |
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| 206 | else |
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| 207 | ierr=NF_GET_VAR_REAL(nid,nvarid,TESlats) |
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| 208 | endif |
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| 209 | |
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| 210 | ierr=NF_INQ_VARID(nid,"albedo",nvarid) |
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| 211 | if (ierr.ne.NF_NOERR) then |
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| 212 | write(*,*) "Failed to find albedo in file!" |
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| 213 | else |
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| 214 | ierr=NF_GET_VAR_REAL(nid,nvarid,TESalbs) |
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| 215 | endif |
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| 216 | |
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| 217 | ! constants: |
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| 218 | pi=acos(-1.) |
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| 219 | radeg=180/pi |
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| 220 | |
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| 221 | zls_old=-999 ! dummy initialization |
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| 222 | |
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| 223 | firstcall=.false. |
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| 224 | endif ! of if firstcall |
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| 225 | |
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| 226 | ! 1. Identify hemisphere and encompassing latitudes |
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| 227 | if (ig.GT.ngridmx/2+1) then |
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| 228 | icap=2 ! Southern hemisphere |
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| 229 | else |
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| 230 | icap=1 ! Northern hemisphere |
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| 231 | endif |
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| 232 | |
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| 233 | ! Check that latitude is such that there is TES data to use |
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| 234 | ! (ie: latitude 45 deg and poleward) otherwise use 'default' albedoes |
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| 235 | latd=lati(ig)*radeg ! latitude, in degrees |
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| 236 | if (icap.eq.1) then |
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| 237 | ! North hemisphere |
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| 238 | if (latd.lt.TESlatnmin) then |
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| 239 | alb=albedice(1) |
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| 240 | ! the job is done; quit this routine |
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| 241 | return |
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| 242 | else |
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| 243 | ! find encompassing latitudes |
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| 244 | if (latd.ge.TESlatn(TESlatsize)) then |
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| 245 | latinf=TESlatsize |
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| 246 | latsup=TESlatsize |
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| 247 | rellat=0. |
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| 248 | else |
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| 249 | do i=1,TESlatsize-1 |
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| 250 | if ((latd.ge.TESlatn(i)).and.(latd.lt.TESlatn(i+1))) then |
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| 251 | latinf=i |
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| 252 | latsup=i+1 |
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| 253 | rellat=(latd-TESlatn(i))/TESdeltalat |
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| 254 | exit ! found encompassing indexes; quit loop |
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| 255 | endif |
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| 256 | enddo |
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| 257 | endif |
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| 258 | endif ! of if (latd.lt.TESlatnmin) |
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| 259 | else ! icap=2 |
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| 260 | ! South hemisphere |
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| 261 | if (latd.gt.TESlatsmax) then |
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| 262 | alb=albedice(2) |
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| 263 | ! the job is done; quit this routine |
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| 264 | return |
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| 265 | else |
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| 266 | ! find encompassing latitudes |
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| 267 | if (latd.lt.TESlats(1)) then |
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| 268 | latinf=1 |
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| 269 | latsup=1 |
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| 270 | rellat=0. |
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| 271 | else |
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| 272 | do i=1,TESlatsize-1 |
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| 273 | if ((latd.ge.TESlats(i)).and.(latd.lt.TESlats(i+1))) then |
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| 274 | latinf=i |
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| 275 | latsup=i+1 |
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| 276 | rellat=(latd-TESlats(i))/TESdeltalat |
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| 277 | exit ! found encompassing indexes; quit loop |
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| 278 | endif |
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| 279 | enddo |
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| 280 | endif |
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| 281 | endif ! of if (latd.gt.-45.) |
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| 282 | endif ! of if (icap.eq.1) |
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| 283 | |
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| 284 | ! 2. Identify encompassing time indexes |
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| 285 | if (zls.ne.zls_old) then |
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| 286 | zlsd=zls*radeg ! solar longitude, in degrees |
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| 287 | |
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| 288 | if (zlsd.lt.TESls(1)) then |
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| 289 | tinf=TESlssize |
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| 290 | tsup=1 |
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| 291 | reltime=0.5+zlsd/TESdeltals |
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| 292 | else |
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| 293 | if (zlsd.ge.TESls(TESlssize)) then |
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| 294 | tinf=TESlssize |
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| 295 | tsup=1 |
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| 296 | reltime=(360.-zlsd)/TESdeltals |
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| 297 | else |
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| 298 | ! look for encompassing indexes |
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| 299 | do i=1,TESlssize-1 |
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| 300 | if ((zlsd.ge.TESls(i)).and.(zlsd.lt.TESls(i+1))) then |
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| 301 | tinf=i |
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| 302 | tsup=i+1 |
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| 303 | reltime=(zlsd-TESls(i))/TESdeltals |
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| 304 | exit ! quit loop, we found the indexes |
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| 305 | endif |
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| 306 | enddo |
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| 307 | endif |
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| 308 | endif ! of if (zlsd.lt.TESls(1)) |
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| 309 | |
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| 310 | zls_old=zls ! store current zls |
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| 311 | endif ! of if (zls.ne.zls_old) |
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| 312 | |
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| 313 | ! 3. Identify encompassing longitudes |
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| 314 | lond=long(ig)*radeg ! east longitude, in degrees |
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| 315 | if (lond.lt.TESlon(1)) then |
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| 316 | loninf=TESlonsize |
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| 317 | lonsup=1 |
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| 318 | rellon=0.5+(180.+lond)/TESdeltalon |
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| 319 | else |
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| 320 | if (lond.ge.TESlon(TESlonsize)) then |
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| 321 | loninf=TESlonsize |
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| 322 | lonsup=1 |
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| 323 | rellon=(180-lond)/TESdeltalon |
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| 324 | else |
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| 325 | do i=1,TESlonsize-1 |
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| 326 | if ((lond.ge.TESlon(i)).and.(lond.lt.TESlon(i+1))) then |
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| 327 | loninf=i |
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| 328 | lonsup=i+1 |
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| 329 | rellon=(lond-TESlon(i))/TESdeltalon |
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| 330 | exit ! quit loop, we found the indexes |
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| 331 | endif |
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| 332 | enddo |
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| 333 | endif ! of if (lond.ge.TESlon(TESlonsize)) |
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| 334 | endif ! of if (lond.lt.TESlon(1)) |
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| 335 | |
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| 336 | ! 4. Use linear interpolation in time to build encompassing nodal values |
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| 337 | ! encompassing nodes are arranged as follow : 4 3 |
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| 338 | ! 1 2 |
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| 339 | if (icap.eq.1) then |
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| 340 | ! Northern hemisphere |
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| 341 | val(1)=(1.-reltime)*TESalbn(loninf,latinf,tinf) & |
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| 342 | +reltime*TESalbn(loninf,latinf,tsup) |
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| 343 | val(2)=(1.-reltime)*TESalbn(lonsup,latinf,tinf) & |
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| 344 | +reltime*TESalbn(lonsup,latinf,tsup) |
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| 345 | val(3)=(1.-reltime)*TESalbn(lonsup,latsup,tinf) & |
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| 346 | +reltime*TESalbn(lonsup,latsup,tsup) |
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| 347 | val(4)=(1.-reltime)*TESalbn(loninf,latsup,tinf) & |
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| 348 | +reltime*TESalbn(loninf,latsup,tsup) |
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| 349 | else |
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| 350 | ! Southern hemisphere |
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| 351 | val(1)=(1.-reltime)*TESalbs(loninf,latinf,tinf) & |
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| 352 | +reltime*TESalbs(loninf,latinf,tsup) |
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| 353 | val(2)=(1.-reltime)*TESalbs(lonsup,latinf,tinf) & |
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| 354 | +reltime*TESalbs(lonsup,latinf,tsup) |
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| 355 | val(3)=(1.-reltime)*TESalbs(lonsup,latsup,tinf) & |
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| 356 | +reltime*TESalbs(lonsup,latsup,tsup) |
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| 357 | val(4)=(1.-reltime)*TESalbs(loninf,latsup,tinf) & |
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| 358 | +reltime*TESalbs(loninf,latsup,tsup) |
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| 359 | endif ! of if (icap.eq.1) |
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| 360 | |
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| 361 | ! 5. Use bilinear interpolation to compute albedo |
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| 362 | alb=(1.-rellon)*(1.-rellat)*val(1) & |
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| 363 | +rellon*(1.-rellat)*val(2) & |
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| 364 | +rellon*rellat*val(3) & |
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| 365 | +(1.-rellon)*rellat*val(4) |
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| 366 | |
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| 367 | ! 6. Apply coefficient to interpolated TES albedo |
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| 368 | if (icap.eq.1) then |
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| 369 | alb=alb*TESice_Ncoef |
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| 370 | else |
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| 371 | alb=alb*TESice_Scoef |
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| 372 | endif ! of if (icap.eq.1) |
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| 373 | |
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| 374 | end subroutine TES_icecap_albedo |
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| 375 | |
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