| 1 | MODULE sbcflx |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcflx *** |
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| 4 | !! Ocean forcing: momentum, heat and freshwater flux formulation |
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| 5 | !!===================================================================== |
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| 6 | !! History : 9.0 ! 06-06 (G. Madec) Original code |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! namflx : flux formulation namlist |
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| 11 | !! sbc_flx : flux formulation as ocean surface boundary condition |
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| 12 | !! (forced mode, fluxes read in NetCDF files) |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! question diverses |
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| 15 | !! * ajouter un test sur la division entier de freqh et rdttra ??? |
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| 16 | !! ** ajoute dans namelist: 1 year forcing files |
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| 17 | !! or forcing file starts at the begining of the run |
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| 18 | !! *** we assume that the forcing file start and end with the previous |
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| 19 | !! year last record and the next year first record (useful for |
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| 20 | !! time interpolation, required even if no time interp???) |
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| 21 | !! * ajouter un test sur la division de la frequence en pas de temps |
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| 22 | !! ==> daymod ajout de nsec_year = number of second since the begining of the year |
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| 23 | !! assumed to be 0 at 0h january the 1st (i.e. 24h december the 31) |
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| 24 | !! |
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| 25 | !! *** regrouper dtatem et dtasal |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | USE oce ! ocean dynamics and tracers |
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| 28 | USE dom_oce ! ocean space and time domain |
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| 29 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 30 | USE phycst ! physical constants |
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| 31 | USE daymod ! calendar |
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| 32 | USE fldread ! read input fields |
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| 33 | USE iom ! IOM library |
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| 34 | USE in_out_manager ! I/O manager |
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| 35 | USE lib_mpp ! distribued memory computing library |
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| 36 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 37 | |
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| 38 | IMPLICIT NONE |
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| 39 | PRIVATE |
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| 40 | |
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| 41 | PUBLIC sbc_flx ! routine called by step.F90 |
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| 42 | |
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| 43 | INTEGER , PARAMETER :: jpfld = 5 ! maximum number of files to read |
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| 44 | INTEGER , PARAMETER :: jp_utau = 1 ! index of wind stress (i-component) file |
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| 45 | INTEGER , PARAMETER :: jp_vtau = 2 ! index of wind stress (j-component) file |
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| 46 | INTEGER , PARAMETER :: jp_qtot = 3 ! index of total (non solar+solar) heat file |
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| 47 | INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat file |
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| 48 | INTEGER , PARAMETER :: jp_emp = 5 ! index of evaporation-precipation file |
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| 49 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) |
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| 50 | |
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| 51 | REAL(wp) :: rhoa = 1.22 ! Air density kg/m3 |
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| 52 | REAL(wp) :: cdrag = 1.5e-3 ! drag coefficient |
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| 53 | |
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| 54 | !! * Substitutions |
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| 55 | # include "domzgr_substitute.h90" |
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| 56 | # include "vectopt_loop_substitute.h90" |
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| 57 | !!---------------------------------------------------------------------- |
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| 58 | !! OPA 9.0 , LOCEAN-IPSL (2006) |
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| 59 | !! $ Id: $ |
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| 60 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | |
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| 63 | CONTAINS |
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| 64 | |
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| 65 | SUBROUTINE sbc_flx( kt ) |
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| 66 | !!--------------------------------------------------------------------- |
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| 67 | !! *** ROUTINE sbc_flx *** |
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| 68 | !! |
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| 69 | !! ** Purpose : provide at each time step the surface ocean fluxes |
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| 70 | !! (momentum, heat, freshwater and runoff) |
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| 71 | !! |
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| 72 | !! ** Method : - READ each fluxes in NetCDF files: |
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| 73 | !! i-component of the stress utau (N/m2) |
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| 74 | !! j-component of the stress vtau (N/m2) |
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| 75 | !! net downward heat flux qtot (watt/m2) |
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| 76 | !! net downward radiative flux qsr (watt/m2) |
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| 77 | !! net upward freshwater (evapo - precip) emp (kg/m2/s) |
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| 78 | !! Assumptions made: |
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| 79 | !! - each file content an entire year (read record, not the time axis) |
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| 80 | !! - first and last record are part of the previous and next year |
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| 81 | !! (useful for time interpolation) |
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| 82 | !! - the number of records is 2 + 365*24 / freqh(jf) |
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| 83 | !! or 366 in leap year case |
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| 84 | !! |
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| 85 | !! CAUTION : - never mask the surface stress fields |
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| 86 | !! - the stress is assumed to be in the mesh referential |
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| 87 | !! i.e. the (i,j) referential |
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| 88 | !! |
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| 89 | !! ** Action : update at each time-step |
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| 90 | !! - utau & vtau : stress components in (i,j) referential |
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| 91 | !! - qns : non solar heat flux |
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| 92 | !! - qsr : solar heat flux |
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| 93 | !! - emp : evap - precip (volume flux) |
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| 94 | !! - emps : evap - precip (concentration/dillution) |
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| 95 | !!---------------------------------------------------------------------- |
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| 96 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 97 | !! |
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| 98 | INTEGER :: ji, jj, jf ! dummy indices |
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| 99 | INTEGER :: ierror ! return error code |
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| 100 | REAL(wp) :: zfact ! temporary scalar |
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| 101 | REAL(wp) :: ztx, zty, ztau, zcoef |
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| 102 | !! |
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| 103 | CHARACTER(len=100) :: cn_dir ! Root directory for location of flx files |
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| 104 | TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist information structures |
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| 105 | TYPE(FLD_N) :: sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp ! informations about the fields to be read |
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| 106 | NAMELIST/namsbc_flx/ cn_dir, sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp |
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| 107 | !!--------------------------------------------------------------------- |
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| 108 | ! ! ====================== ! |
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| 109 | IF( kt == nit000 ) THEN ! First call kt=nit000 ! |
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| 110 | ! ! ====================== ! |
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| 111 | ! set file information |
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| 112 | cn_dir = './' ! directory in which the model is executed |
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| 113 | ! ... default values (NB: frequency positive => hours, negative => months) |
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| 114 | ! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! |
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| 115 | ! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! |
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| 116 | sn_utau = FLD_N( 'utau' , 24. , 'utau' , .false. , .false. , 'yearly' ) |
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| 117 | sn_vtau = FLD_N( 'vtau' , 24. , 'vtau' , .false. , .false. , 'yearly' ) |
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| 118 | sn_qtot = FLD_N( 'qtot' , 24. , 'qtot' , .false. , .false. , 'yearly' ) |
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| 119 | sn_qsr = FLD_N( 'qsr' , 24. , 'qsr' , .false. , .false. , 'yearly' ) |
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| 120 | sn_emp = FLD_N( 'emp' , 24. , 'emp' , .false. , .false. , 'yearly' ) |
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| 121 | |
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| 122 | REWIND ( numnam ) ! ... read in namlist namflx |
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| 123 | READ ( numnam, namsbc_flx ) |
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| 124 | |
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| 125 | ! store namelist information in an array |
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| 126 | slf_i(jp_utau) = sn_utau ; slf_i(jp_vtau) = sn_vtau |
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| 127 | slf_i(jp_qtot) = sn_qtot ; slf_i(jp_qsr ) = sn_qsr |
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| 128 | slf_i(jp_emp ) = sn_emp |
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| 129 | |
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| 130 | ! set sf structure |
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| 131 | ALLOCATE( sf(jpfld), STAT=ierror ) |
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| 132 | IF( ierror > 0 ) THEN |
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| 133 | CALL ctl_stop( 'sbc_flx: unable to allocate sf structure' ) ; RETURN |
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| 134 | ENDIF |
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| 135 | |
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| 136 | ! fill sf with slf_i and control print |
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| 137 | CALL fld_fill( sf, slf_i, cn_dir, 'sbc_flx', 'flux formulation for ocean surface boundary condition', 'namsbc_flx' ) |
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| 138 | ! |
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| 139 | ENDIF |
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| 140 | |
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| 141 | CALL fld_read( kt, nn_fsbc, sf ) ! Read input fields and provides the |
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| 142 | ! ! input fields at the current time-step |
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| 143 | |
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| 144 | ! set the ocean fluxes from read fields |
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| 145 | !CDIR COLLAPSE |
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| 146 | DO jj = 1, jpj |
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| 147 | DO ji = 1, jpi |
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| 148 | utau(ji,jj) = sf(jp_utau)%fnow(ji,jj) |
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| 149 | vtau(ji,jj) = sf(jp_vtau)%fnow(ji,jj) |
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| 150 | qns (ji,jj) = sf(jp_qtot)%fnow(ji,jj) - sf(jp_qsr)%fnow(ji,jj) |
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| 151 | qsr (ji,jj) = sf(jp_qsr )%fnow(ji,jj) |
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| 152 | emp (ji,jj) = sf(jp_emp )%fnow(ji,jj) |
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| 153 | END DO |
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| 154 | END DO |
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| 155 | |
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| 156 | ! Estimation of wind speed as a function of wind stress ( |tau|=rhoa*Cd*|U|^2 ) |
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| 157 | zcoef = 0.5 / ( rhoa * cdrag ) |
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| 158 | !CDIR NOVERRCHK |
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| 159 | DO jj = 2, jpjm1 |
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| 160 | !CDIR NOVERRCHK |
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| 161 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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| 162 | ztx = utau(ji-1,jj ) + utau(ji,jj) |
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| 163 | zty = vtau(ji ,jj-1) + vtau(ji,jj) |
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| 164 | ztau = SQRT( ztx * ztx + zty * zty ) |
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| 165 | wndm(ji,jj) = SQRT ( ztau * zcoef ) * tmask(ji,jj,1) |
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| 166 | END DO |
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| 167 | END DO |
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| 168 | CALL lbc_lnk( wndm(:,:) , 'T', 1. ) |
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| 169 | |
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| 170 | ! control print (if less than 100 time-step asked) |
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| 171 | IF( nitend-nit000 <= 100 .AND. lwp ) THEN |
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| 172 | WRITE(numout,*) |
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| 173 | WRITE(numout,*) ' read daily momentum, heat and freshwater fluxes OK' |
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| 174 | DO jf = 1, jpfld |
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| 175 | IF( jf == jp_utau .OR. jf == jp_vtau ) zfact = 1. |
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| 176 | IF( jf == jp_qtot .OR. jf == jp_qsr ) zfact = 0.1 |
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| 177 | IF( jf == jp_emp ) zfact = 86400. |
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| 178 | WRITE(numout,*) |
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| 179 | WRITE(numout,*) ' day: ', ndastp , TRIM(sf(jf)%clvar), ' * ', zfact |
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| 180 | CALL prihre( sf(jf)%fnow, jpi, jpj, 1, jpi, 20, 1, jpj, 10, 1., numout ) |
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| 181 | END DO |
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| 182 | CALL FLUSH(numout) |
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| 183 | ENDIF |
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| 184 | ! |
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| 185 | END SUBROUTINE sbc_flx |
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| 186 | |
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| 187 | !!====================================================================== |
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| 188 | END MODULE sbcflx |
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