| [888] | 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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| [2528] | 6 | !! History : 1.0 ! 2006-06 (G. Madec) Original code |
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| 7 | !! 3.3 ! 2010-10 (S. Masson) add diurnal cycle |
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| [888] | 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! namflx : flux formulation namlist |
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| [2528] | 12 | !! sbc_flx : flux formulation as ocean surface boundary condition (forced mode, fluxes read in NetCDF files) |
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| [888] | 13 | !!---------------------------------------------------------------------- |
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| 14 | USE oce ! ocean dynamics and tracers |
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| 15 | USE dom_oce ! ocean space and time domain |
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| [2528] | 16 | USE sbc_oce ! surface boundary condition: ocean fields |
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| 17 | USE sbcdcy ! surface boundary condition: diurnal cycle on qsr |
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| [888] | 18 | USE phycst ! physical constants |
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| 19 | USE fldread ! read input fields |
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| 20 | USE iom ! IOM library |
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| 21 | USE in_out_manager ! I/O manager |
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| [8415] | 22 | USE sbcwave ! wave physics |
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| [888] | 23 | USE lib_mpp ! distribued memory computing library |
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| 24 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| [8415] | 25 | USE wrk_nemo ! work arrays |
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| [888] | 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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| 29 | |
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| 30 | PUBLIC sbc_flx ! routine called by step.F90 |
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| 31 | |
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| 32 | INTEGER , PARAMETER :: jpfld = 5 ! maximum number of files to read |
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| 33 | INTEGER , PARAMETER :: jp_utau = 1 ! index of wind stress (i-component) file |
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| 34 | INTEGER , PARAMETER :: jp_vtau = 2 ! index of wind stress (j-component) file |
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| 35 | INTEGER , PARAMETER :: jp_qtot = 3 ! index of total (non solar+solar) heat file |
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| 36 | INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat file |
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| 37 | INTEGER , PARAMETER :: jp_emp = 5 ! index of evaporation-precipation file |
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| 38 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) |
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| [7792] | 39 | LOGICAL , PUBLIC :: ln_shelf_flx = .FALSE. ! UKMO SHELF specific flux flag |
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| [8415] | 40 | LOGICAL , PUBLIC :: ln_rel_wind = .FALSE. ! UKMO SHELF specific flux flag - relative winds |
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| 41 | REAL(wp) :: rn_wfac ! multiplication factor for ice/ocean velocity in the calculation of wind stress (clem) |
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| [7792] | 42 | INTEGER :: jpfld_local ! maximum number of files to read (locally modified depending on ln_shelf_flx) |
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| [888] | 43 | |
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| 44 | !! * Substitutions |
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| 45 | # include "domzgr_substitute.h90" |
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| [1029] | 46 | # include "vectopt_loop_substitute.h90" |
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| [888] | 47 | !!---------------------------------------------------------------------- |
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| [2528] | 48 | !! NEMO/OPA 3.3 , NEMO-consortium (2010) |
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| [1156] | 49 | !! $Id$ |
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| [2715] | 50 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| [888] | 51 | !!---------------------------------------------------------------------- |
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| 52 | CONTAINS |
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| 53 | |
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| 54 | SUBROUTINE sbc_flx( kt ) |
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| 55 | !!--------------------------------------------------------------------- |
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| 56 | !! *** ROUTINE sbc_flx *** |
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| 57 | !! |
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| 58 | !! ** Purpose : provide at each time step the surface ocean fluxes |
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| 59 | !! (momentum, heat, freshwater and runoff) |
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| 60 | !! |
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| 61 | !! ** Method : - READ each fluxes in NetCDF files: |
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| 62 | !! i-component of the stress utau (N/m2) |
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| 63 | !! j-component of the stress vtau (N/m2) |
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| 64 | !! net downward heat flux qtot (watt/m2) |
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| 65 | !! net downward radiative flux qsr (watt/m2) |
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| 66 | !! net upward freshwater (evapo - precip) emp (kg/m2/s) |
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| 67 | !! |
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| 68 | !! CAUTION : - never mask the surface stress fields |
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| [3625] | 69 | !! - the stress is assumed to be in the (i,j) mesh referential |
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| [888] | 70 | !! |
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| 71 | !! ** Action : update at each time-step |
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| [1695] | 72 | !! - utau, vtau i- and j-component of the wind stress |
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| 73 | !! - taum wind stress module at T-point |
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| 74 | !! - wndm 10m wind module at T-point |
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| [3625] | 75 | !! - qns non solar heat flux including heat flux due to emp |
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| 76 | !! - qsr solar heat flux |
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| 77 | !! - emp upward mass flux (evap. - precip.) |
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| 78 | !! - sfx salt flux; set to zero at nit000 but possibly non-zero |
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| 79 | !! if ice is present (computed in limsbc(_2).F90) |
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| [888] | 80 | !!---------------------------------------------------------------------- |
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| 81 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 82 | !! |
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| [1695] | 83 | INTEGER :: ji, jj, jf ! dummy indices |
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| 84 | INTEGER :: ierror ! return error code |
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| [4147] | 85 | INTEGER :: ios ! Local integer output status for namelist read |
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| [1695] | 86 | REAL(wp) :: zfact ! temporary scalar |
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| 87 | REAL(wp) :: zrhoa = 1.22 ! Air density kg/m3 |
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| 88 | REAL(wp) :: zcdrag = 1.5e-3 ! drag coefficient |
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| [7792] | 89 | REAL(wp) :: totwind ! UKMO SHELF: Module of wind speed |
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| [1695] | 90 | REAL(wp) :: ztx, zty, zmod, zcoef ! temporary variables |
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| [888] | 91 | !! |
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| 92 | CHARACTER(len=100) :: cn_dir ! Root directory for location of flx files |
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| [8415] | 93 | NAMELIST/namsbc_flx/ ln_shelf_flx, ln_rel_wind, rn_wfac ! Put here to allow merging with another UKMO branch |
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| [888] | 94 | TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist information structures |
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| 95 | TYPE(FLD_N) :: sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp ! informations about the fields to be read |
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| 96 | NAMELIST/namsbc_flx/ cn_dir, sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp |
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| 97 | !!--------------------------------------------------------------------- |
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| [2528] | 98 | ! |
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| 99 | IF( kt == nit000 ) THEN ! First call kt=nit000 |
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| [888] | 100 | ! set file information |
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| [4147] | 101 | REWIND( numnam_ref ) ! Namelist namsbc_flx in reference namelist : Files for fluxes |
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| 102 | READ ( numnam_ref, namsbc_flx, IOSTAT = ios, ERR = 901) |
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| 103 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_flx in reference namelist', lwp ) |
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| 104 | |
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| 105 | REWIND( numnam_cfg ) ! Namelist namsbc_flx in configuration namelist : Files for fluxes |
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| 106 | READ ( numnam_cfg, namsbc_flx, IOSTAT = ios, ERR = 902 ) |
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| 107 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_flx in configuration namelist', lwp ) |
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| [4624] | 108 | IF(lwm) WRITE ( numond, namsbc_flx ) |
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| [2528] | 109 | ! |
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| 110 | ! ! check: do we plan to use ln_dm2dc with non-daily forcing? |
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| 111 | IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) & |
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| 112 | & CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' ) |
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| 113 | ! |
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| 114 | ! ! store namelist information in an array |
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| [888] | 115 | slf_i(jp_utau) = sn_utau ; slf_i(jp_vtau) = sn_vtau |
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| 116 | slf_i(jp_qtot) = sn_qtot ; slf_i(jp_qsr ) = sn_qsr |
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| 117 | slf_i(jp_emp ) = sn_emp |
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| [2528] | 118 | ! |
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| 119 | ALLOCATE( sf(jpfld), STAT=ierror ) ! set sf structure |
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| [1133] | 120 | IF( ierror > 0 ) THEN |
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| 121 | CALL ctl_stop( 'sbc_flx: unable to allocate sf structure' ) ; RETURN |
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| [888] | 122 | ENDIF |
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| [1200] | 123 | DO ji= 1, jpfld |
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| [2528] | 124 | ALLOCATE( sf(ji)%fnow(jpi,jpj,1) ) |
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| 125 | IF( slf_i(ji)%ln_tint ) ALLOCATE( sf(ji)%fdta(jpi,jpj,1,2) ) |
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| [1200] | 126 | END DO |
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| [2528] | 127 | ! ! fill sf with slf_i and control print |
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| [1133] | 128 | CALL fld_fill( sf, slf_i, cn_dir, 'sbc_flx', 'flux formulation for ocean surface boundary condition', 'namsbc_flx' ) |
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| [888] | 129 | ! |
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| [3625] | 130 | sfx(:,:) = 0.0_wp ! salt flux due to freezing/melting (non-zero only if ice is present; set in limsbc(_2).F90) |
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| 131 | ! |
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| [888] | 132 | ENDIF |
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| 133 | |
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| [2528] | 134 | CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step |
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| 135 | |
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| 136 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN ! update ocean fluxes at each SBC frequency |
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| [888] | 137 | |
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| [8415] | 138 | !!UKMO SHELF wind speed relative to surface currents - put here to allow merging with coupling branch |
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| 139 | IF( ln_shelf_flx ) THEN |
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| 140 | CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j ) |
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| 141 | |
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| 142 | IF( ln_rel_wind ) THEN |
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| 143 | DO jj = 2, jpjm1 |
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| 144 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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| 145 | zwnd_i(ji,jj) = ( sf(jp_utau)%fnow(ji,jj,1) - rn_wfac * 0.5 * ( ssu_m(ji-1,jj ) + ssu_m(ji,jj) )) |
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| 146 | zwnd_j(ji,jj) = ( sf(jp_vtau)%fnow(ji,jj,1) - rn_wfac * 0.5 * ( ssv_m(ji ,jj-1) + ssv_m(ji,jj) )) |
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| 147 | END DO |
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| 148 | END DO |
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| 149 | CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. ) |
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| 150 | CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. ) |
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| 151 | ELSE |
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| 152 | zwnd_i(:,:) = sf(jp_utau)%fnow(:,:,1) |
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| 153 | zwnd_j(:,:) = sf(jp_vtau)%fnow(:,:,1) |
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| 154 | ENDIF |
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| 155 | ENDIF |
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| 156 | |
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| [2528] | 157 | IF( ln_dm2dc ) THEN ; qsr(:,:) = sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) ! modify now Qsr to include the diurnal cycle |
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| 158 | ELSE ; qsr(:,:) = sf(jp_qsr)%fnow(:,:,1) |
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| 159 | ENDIF |
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| [888] | 160 | !CDIR COLLAPSE |
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| [2528] | 161 | DO jj = 1, jpj ! set the ocean fluxes from read fields |
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| [1274] | 162 | DO ji = 1, jpi |
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| [2528] | 163 | utau(ji,jj) = sf(jp_utau)%fnow(ji,jj,1) |
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| 164 | vtau(ji,jj) = sf(jp_vtau)%fnow(ji,jj,1) |
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| 165 | qns (ji,jj) = sf(jp_qtot)%fnow(ji,jj,1) - sf(jp_qsr)%fnow(ji,jj,1) |
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| 166 | emp (ji,jj) = sf(jp_emp )%fnow(ji,jj,1) |
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| [1274] | 167 | END DO |
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| [888] | 168 | END DO |
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| [7792] | 169 | ! ! add modification due to drag coefficient read from wave forcing |
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| 170 | ! ! this code is inefficient but put here to allow merging with another UKMO branch |
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| 171 | IF( ln_shelf_flx ) THEN |
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| 172 | IF( ln_cdgw .AND. nn_drag == jp_std ) THEN |
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| 173 | IF( cpl_wdrag ) THEN |
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| 174 | ! reset utau and vtau to the wind components: the momentum will |
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| 175 | ! be calculated from the coupled value of the drag coefficient |
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| 176 | DO jj = 1, jpj |
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| 177 | DO ji = 1, jpi |
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| [8415] | 178 | utau(ji,jj) = zwnd_i(ji,jj) |
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| [8502] | 179 | vtau(ji,jj) = zwnd_j(ji,jj) |
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| [7792] | 180 | END DO |
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| 181 | END DO |
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| 182 | ELSE |
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| 183 | DO jj = 1, jpj |
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| 184 | DO ji = 1, jpi |
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| [8415] | 185 | totwind = sqrt(zwnd_i(ji,jj)*zwnd_i(ji,jj) + zwnd_j(ji,jj)*zwnd_j(ji,jj)) |
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| 186 | utau(ji,jj) = zrhoa * cdn_wave(ji,jj) * zwnd_i(ji,jj) * totwind |
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| 187 | vtau(ji,jj) = zrhoa * cdn_wave(ji,jj) * zwnd_j(ji,jj) * totwind |
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| [7792] | 188 | END DO |
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| 189 | END DO |
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| 190 | ENDIF |
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| 191 | ELSE IF( nn_drag == jp_const ) THEN |
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| 192 | DO jj = 1, jpj |
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| 193 | DO ji = 1, jpi |
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| [8415] | 194 | totwind = sqrt(zwnd_i(ji,jj)*zwnd_i(ji,jj) + zwnd_j(ji,jj)*zwnd_j(ji,jj)) |
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| 195 | utau(ji,jj) = zrhoa * zcdrag * zwnd_i(ji,jj) * totwind |
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| 196 | vtau(ji,jj) = zrhoa * zcdrag * zwnd_j(ji,jj) * totwind |
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| [7792] | 197 | END DO |
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| 198 | END DO |
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| 199 | ENDIF |
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| 200 | ENDIF |
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| [3625] | 201 | ! ! add to qns the heat due to e-p |
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| 202 | qns(:,:) = qns(:,:) - emp(:,:) * sst_m(:,:) * rcp ! mass flux is at SST |
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| 203 | ! |
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| [2528] | 204 | ! ! module of wind stress and wind speed at T-point |
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| 205 | zcoef = 1. / ( zrhoa * zcdrag ) |
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| [1695] | 206 | !CDIR NOVERRCHK |
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| 207 | DO jj = 2, jpjm1 |
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| 208 | !CDIR NOVERRCHK |
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| 209 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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| 210 | ztx = utau(ji-1,jj ) + utau(ji,jj) |
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| 211 | zty = vtau(ji ,jj-1) + vtau(ji,jj) |
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| 212 | zmod = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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| 213 | taum(ji,jj) = zmod |
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| [7792] | 214 | IF( ln_shelf_flx ) THEN |
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| [8415] | 215 | ! winds as received, not relative to the current |
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| [7792] | 216 | ztx = sf(jp_utau)%fnow(ji-1,jj ) + sf(jp_utau)%fnow(ji,jj) |
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| 217 | zty = sf(jp_vtau)%fnow(ji ,jj-1) + sf(jp_vtau)%fnow(ji,jj) |
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| 218 | wndm(ji,jj) = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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| 219 | ELSE |
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| [1695] | 220 | wndm(ji,jj) = SQRT( zmod * zcoef ) |
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| [7792] | 221 | ENDIF |
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| [1695] | 222 | END DO |
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| 223 | END DO |
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| [4990] | 224 | taum(:,:) = taum(:,:) * tmask(:,:,1) ; wndm(:,:) = wndm(:,:) * tmask(:,:,1) |
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| [1695] | 225 | CALL lbc_lnk( taum(:,:), 'T', 1. ) ; CALL lbc_lnk( wndm(:,:), 'T', 1. ) |
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| 226 | |
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| [2528] | 227 | IF( nitend-nit000 <= 100 .AND. lwp ) THEN ! control print (if less than 100 time-step asked) |
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| [888] | 228 | WRITE(numout,*) |
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| [1274] | 229 | WRITE(numout,*) ' read daily momentum, heat and freshwater fluxes OK' |
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| 230 | DO jf = 1, jpfld |
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| 231 | IF( jf == jp_utau .OR. jf == jp_vtau ) zfact = 1. |
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| 232 | IF( jf == jp_qtot .OR. jf == jp_qsr ) zfact = 0.1 |
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| 233 | IF( jf == jp_emp ) zfact = 86400. |
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| 234 | WRITE(numout,*) |
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| 235 | WRITE(numout,*) ' day: ', ndastp , TRIM(sf(jf)%clvar), ' * ', zfact |
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| 236 | CALL prihre( sf(jf)%fnow, jpi, jpj, 1, jpi, 20, 1, jpj, 10, zfact, numout ) |
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| 237 | END DO |
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| 238 | CALL FLUSH(numout) |
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| 239 | ENDIF |
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| 240 | ! |
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| [8415] | 241 | IF( ln_shelf_flx ) THEN |
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| 242 | CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j ) |
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| 243 | ENDIF |
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| 244 | ! |
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| [888] | 245 | ENDIF |
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| 246 | ! |
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| 247 | END SUBROUTINE sbc_flx |
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| 248 | |
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| 249 | !!====================================================================== |
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| 250 | END MODULE sbcflx |
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