| 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 : 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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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! namflx : flux formulation namlist |
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| 12 | !! sbc_flx : flux formulation as ocean surface boundary condition (forced mode, fluxes read in NetCDF files) |
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| 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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| 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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| 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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| 22 | USE sbcwave ! wave physics |
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| 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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| 25 | USE wrk_nemo ! work arrays |
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| 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 :: jpfld = 6 ! maximum number of files to read |
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| 33 | INTEGER :: jp_utau ! index of wind stress (i-component) file |
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| 34 | INTEGER :: jp_vtau ! index of wind stress (j-component) file |
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| 35 | INTEGER :: jp_qtot ! index of total (non solar+solar) heat file |
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| 36 | INTEGER :: jp_qsr ! index of solar heat file |
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| 37 | INTEGER :: jp_emp ! index of evaporation-precipation file |
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| 38 | INTEGER :: jp_press ! index of pressure for UKMO shelf fluxes |
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| 39 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) |
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| 40 | LOGICAL , PUBLIC :: ln_shelf_flx = .FALSE. ! UKMO SHELF specific flux flag |
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| 41 | LOGICAL , PUBLIC :: ln_rel_wind = .FALSE. ! UKMO SHELF specific flux flag - relative winds |
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| 42 | REAL(wp) :: rn_wfac ! multiplication factor for ice/ocean velocity in the calculation of wind stress (clem) |
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| 43 | INTEGER :: jpfld_local ! maximum number of files to read (locally modified depending on ln_shelf_flx) |
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| 44 | |
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| 45 | !! * Substitutions |
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| 46 | # include "domzgr_substitute.h90" |
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| 47 | # include "vectopt_loop_substitute.h90" |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! NEMO/OPA 3.3 , NEMO-consortium (2010) |
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| 50 | !! $Id$ |
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| 51 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 52 | !!---------------------------------------------------------------------- |
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| 53 | CONTAINS |
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| 54 | |
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| 55 | SUBROUTINE sbc_flx( kt ) |
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| 56 | !!--------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE sbc_flx *** |
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| 58 | !! |
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| 59 | !! ** Purpose : provide at each time step the surface ocean fluxes |
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| 60 | !! (momentum, heat, freshwater and runoff) |
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| 61 | !! |
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| 62 | !! ** Method : - READ each fluxes in NetCDF files: |
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| 63 | !! i-component of the stress utau (N/m2) |
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| 64 | !! j-component of the stress vtau (N/m2) |
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| 65 | !! net downward heat flux qtot (watt/m2) |
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| 66 | !! net downward radiative flux qsr (watt/m2) |
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| 67 | !! net upward freshwater (evapo - precip) emp (kg/m2/s) |
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| 68 | !! |
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| 69 | !! CAUTION : - never mask the surface stress fields |
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| 70 | !! - the stress is assumed to be in the (i,j) mesh referential |
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| 71 | !! |
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| 72 | !! ** Action : update at each time-step |
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| 73 | !! - utau, vtau i- and j-component of the wind stress |
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| 74 | !! - taum wind stress module at T-point |
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| 75 | !! - wndm 10m wind module at T-point |
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| 76 | !! - qns non solar heat flux including heat flux due to emp |
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| 77 | !! - qsr solar heat flux |
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| 78 | !! - emp upward mass flux (evap. - precip.) |
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| 79 | !! - sfx salt flux; set to zero at nit000 but possibly non-zero |
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| 80 | !! if ice is present (computed in limsbc(_2).F90) |
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| 81 | !!---------------------------------------------------------------------- |
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| 82 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 83 | !! |
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| 84 | INTEGER :: ji, jj, jf ! dummy indices |
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| 85 | INTEGER :: ierror ! return error code |
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| 86 | INTEGER :: ios ! Local integer output status for namelist read |
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| 87 | REAL(wp) :: zfact ! temporary scalar |
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| 88 | REAL(wp) :: zrhoa = 1.22 ! Air density kg/m3 |
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| 89 | REAL(wp) :: zcdrag = 1.5e-3 ! drag coefficient |
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| 90 | REAL(wp) :: totwind ! UKMO SHELF: Module of wind speed |
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| 91 | REAL(wp) :: ztx, zty, zmod, zcoef ! temporary variables |
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| 92 | !! |
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| 93 | CHARACTER(len=100) :: cn_dir ! Root directory for location of flx files |
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| 94 | NAMELIST/namsbc_flx/ ln_shelf_flx, ln_rel_wind, rn_wfac ! Put here to allow merging with another UKMO branch |
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| 95 | LOGICAL :: ln_readtau ! Is it necessary to read tau from file? |
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| 96 | TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist information structures |
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| 97 | TYPE(FLD_N) :: sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp ! informations about the fields to be read |
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| 98 | NAMELIST/namsbc_flx/ cn_dir, sn_utau, sn_vtau, sn_qtot, sn_qsr, sn_emp |
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| 99 | !!--------------------------------------------------------------------- |
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| 100 | ! |
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| 101 | ln_readtau = .NOT. (ln_wave .AND. ln_tauw ) |
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| 102 | |
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| 103 | ! prepare the index of the fields that have to be read |
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| 104 | jpfld = 0 |
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| 105 | IF( ln_readtau ) THEN |
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| 106 | jp_utau = jpfld+1 |
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| 107 | jp_vtau = jpfld+2 |
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| 108 | jpfld = jpfld+2 |
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| 109 | ELSE |
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| 110 | jp_utau = 0 ; jp_vtau = 0 |
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| 111 | ENDIF |
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| 112 | jp_qtot = jpfld+1 |
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| 113 | jp_qsr = jpfld+2 |
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| 114 | jp_emp = jpfld+3 |
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| 115 | jp_press = jpfld+4 |
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| 116 | jpfld = jpfld+4 |
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| 117 | |
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| 118 | IF( kt == nit000 ) THEN ! First call kt=nit000 |
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| 119 | ! set file information |
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| 120 | REWIND( numnam_ref ) ! Namelist namsbc_flx in reference namelist : Files for fluxes |
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| 121 | READ ( numnam_ref, namsbc_flx, IOSTAT = ios, ERR = 901) |
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| 122 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_flx in reference namelist', lwp ) |
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| 123 | |
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| 124 | REWIND( numnam_cfg ) ! Namelist namsbc_flx in configuration namelist : Files for fluxes |
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| 125 | READ ( numnam_cfg, namsbc_flx, IOSTAT = ios, ERR = 902 ) |
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| 126 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_flx in configuration namelist', lwp ) |
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| 127 | IF(lwm) WRITE ( numond, namsbc_flx ) |
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| 128 | ! |
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| 129 | IF(lwp) THEN ! Namelist print |
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| 130 | WRITE(numout,*) |
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| 131 | WRITE(numout,*) 'sbc_flx : Flux forcing' |
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| 132 | WRITE(numout,*) '~~~~~~~~~~~' |
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| 133 | WRITE(numout,*) ' Namelist namsbc_flx : shelf seas configuration (force with winds instead of momentum)' |
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| 134 | WRITE(numout,*) ' shelf seas configuration ln_shelf_flx = ', ln_shelf_flx |
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| 135 | WRITE(numout,*) ' relative wind speed ln_rel_wind = ', ln_rel_wind |
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| 136 | WRITE(numout,*) ' wind multiplication factor rn_wfac = ', rn_wfac |
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| 137 | ENDIF |
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| 138 | ! ! check: do we plan to use ln_dm2dc with non-daily forcing? |
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| 139 | IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) & |
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| 140 | & CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' ) |
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| 141 | ! |
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| 142 | ! ! store namelist information in an array |
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| 143 | IF( ln_readtau ) THEN |
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| 144 | slf_i(jp_utau) = sn_utau ; slf_i(jp_vtau) = sn_vtau |
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| 145 | ENDIF |
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| 146 | slf_i(jp_qtot) = sn_qtot ; slf_i(jp_qsr ) = sn_qsr |
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| 147 | slf_i(jp_emp ) = sn_emp |
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| 148 | ! |
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| 149 | ALLOCATE( sf(jpfld), STAT=ierror ) ! set sf structure |
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| 150 | IF( ierror > 0 ) THEN |
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| 151 | CALL ctl_stop( 'sbc_flx: unable to allocate sf structure' ) ; RETURN |
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| 152 | ENDIF |
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| 153 | DO ji= 1, jpfld |
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| 154 | ALLOCATE( sf(ji)%fnow(jpi,jpj,1) ) |
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| 155 | IF( slf_i(ji)%ln_tint ) ALLOCATE( sf(ji)%fdta(jpi,jpj,1,2) ) |
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| 156 | END DO |
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| 157 | ! ! fill sf with slf_i and control print |
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| 158 | CALL fld_fill( sf, slf_i, cn_dir, 'sbc_flx', 'flux formulation for ocean surface boundary condition', 'namsbc_flx' ) |
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| 159 | ! |
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| 160 | 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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| 161 | ! |
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| 162 | ENDIF |
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| 163 | |
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| 164 | CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step |
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| 165 | |
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| 166 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN ! update ocean fluxes at each SBC frequency |
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| 167 | |
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| 168 | !!UKMO SHELF wind speed relative to surface currents - put here to allow merging with coupling branch |
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| 169 | IF( ln_shelf_flx .AND. ln_readtau ) THEN |
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| 170 | CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j ) |
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| 171 | |
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| 172 | IF( ln_rel_wind ) THEN |
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| 173 | DO jj = 2, jpjm1 |
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| 174 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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| 175 | 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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| 176 | 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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| 177 | END DO |
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| 178 | END DO |
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| 179 | CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. ) |
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| 180 | CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. ) |
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| 181 | ELSE |
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| 182 | zwnd_i(:,:) = sf(jp_utau)%fnow(:,:,1) |
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| 183 | zwnd_j(:,:) = sf(jp_vtau)%fnow(:,:,1) |
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| 184 | ENDIF |
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| 185 | ENDIF |
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| 186 | |
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| 187 | IF( ln_dm2dc ) THEN ; qsr(:,:) = sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) ! modify now Qsr to include the diurnal cycle |
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| 188 | ELSE ; qsr(:,:) = sf(jp_qsr)%fnow(:,:,1) |
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| 189 | ENDIF |
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| 190 | !CDIR COLLAPSE |
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| 191 | DO jj = 1, jpj ! set the ocean fluxes from read fields |
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| 192 | DO ji = 1, jpi |
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| 193 | utau(ji,jj) = sf(jp_utau)%fnow(ji,jj,1) |
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| 194 | vtau(ji,jj) = sf(jp_vtau)%fnow(ji,jj,1) |
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| 195 | qns (ji,jj) = sf(jp_qtot)%fnow(ji,jj,1) - sf(jp_qsr)%fnow(ji,jj,1) |
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| 196 | emp (ji,jj) = sf(jp_emp )%fnow(ji,jj,1) |
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| 197 | END DO |
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| 198 | END DO |
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| 199 | ! ! add modification due to drag coefficient read from wave forcing |
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| 200 | ! ! this code is inefficient but put here to allow merging with another UKMO branch |
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| 201 | IF( ln_shelf_flx .AND. ln_readtau ) THEN |
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| 202 | IF( ln_cdgw .AND. nn_drag == jp_std ) THEN |
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| 203 | IF( cpl_wdrag ) THEN |
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| 204 | ! reset utau and vtau to the wind components: the momentum will |
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| 205 | ! be calculated from the coupled value of the drag coefficient |
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| 206 | DO jj = 1, jpj |
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| 207 | DO ji = 1, jpi |
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| 208 | utau(ji,jj) = zwnd_i(ji,jj) |
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| 209 | vtau(ji,jj) = zwnd_j(ji,jj) |
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| 210 | END DO |
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| 211 | END DO |
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| 212 | ELSE |
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| 213 | DO jj = 1, jpj |
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| 214 | DO ji = 1, jpi |
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| 215 | totwind = sqrt(zwnd_i(ji,jj)*zwnd_i(ji,jj) + zwnd_j(ji,jj)*zwnd_j(ji,jj)) |
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| 216 | utau(ji,jj) = zrhoa * cdn_wave(ji,jj) * zwnd_i(ji,jj) * totwind |
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| 217 | vtau(ji,jj) = zrhoa * cdn_wave(ji,jj) * zwnd_j(ji,jj) * totwind |
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| 218 | END DO |
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| 219 | END DO |
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| 220 | ENDIF |
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| 221 | ELSE IF( nn_drag == jp_const ) THEN |
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| 222 | DO jj = 1, jpj |
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| 223 | DO ji = 1, jpi |
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| 224 | totwind = sqrt(zwnd_i(ji,jj)*zwnd_i(ji,jj) + zwnd_j(ji,jj)*zwnd_j(ji,jj)) |
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| 225 | utau(ji,jj) = zrhoa * zcdrag * zwnd_i(ji,jj) * totwind |
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| 226 | vtau(ji,jj) = zrhoa * zcdrag * zwnd_j(ji,jj) * totwind |
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| 227 | END DO |
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| 228 | END DO |
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| 229 | ENDIF |
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| 230 | ENDIF |
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| 231 | ! ! add to qns the heat due to e-p |
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| 232 | qns(:,:) = qns(:,:) - emp(:,:) * sst_m(:,:) * rcp ! mass flux is at SST |
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| 233 | ! |
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| 234 | ! ! module of wind stress and wind speed at T-point |
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| 235 | IF( ln_readtau ) THEN |
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| 236 | zcoef = 1. / ( zrhoa * zcdrag ) |
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| 237 | !CDIR NOVERRCHK |
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| 238 | DO jj = 2, jpjm1 |
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| 239 | !CDIR NOVERRCHK |
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| 240 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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| 241 | ztx = utau(ji-1,jj ) + utau(ji,jj) |
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| 242 | zty = vtau(ji ,jj-1) + vtau(ji,jj) |
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| 243 | zmod = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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| 244 | taum(ji,jj) = zmod |
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| 245 | IF( ln_shelf_flx ) THEN |
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| 246 | ! winds as received, not relative to the current |
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| 247 | ztx = sf(jp_utau)%fnow(ji-1,jj ) + sf(jp_utau)%fnow(ji,jj) |
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| 248 | zty = sf(jp_vtau)%fnow(ji ,jj-1) + sf(jp_vtau)%fnow(ji,jj) |
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| 249 | wndm(ji,jj) = 0.5 * SQRT( ztx * ztx + zty * zty ) |
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| 250 | ELSE |
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| 251 | wndm(ji,jj) = SQRT( zmod * zcoef ) |
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| 252 | ENDIF |
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| 253 | END DO |
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| 254 | END DO |
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| 255 | taum(:,:) = taum(:,:) * tmask(:,:,1) ; wndm(:,:) = wndm(:,:) * tmask(:,:,1) |
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| 256 | CALL lbc_lnk( taum(:,:), 'T', 1. ) ; CALL lbc_lnk( wndm(:,:), 'T', 1. ) |
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| 257 | ENDIF |
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| 258 | |
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| 259 | IF( nitend-nit000 <= 100 .AND. lwp ) THEN ! control print (if less than 100 time-step asked) |
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| 260 | WRITE(numout,*) |
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| 261 | WRITE(numout,*) ' read daily momentum, heat and freshwater fluxes OK' |
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| 262 | DO jf = 1, jpfld |
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| 263 | IF( jf == jp_utau .OR. jf == jp_vtau ) zfact = 1. |
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| 264 | IF( jf == jp_qtot .OR. jf == jp_qsr ) zfact = 0.1 |
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| 265 | IF( jf == jp_emp ) zfact = 86400. |
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| 266 | WRITE(numout,*) |
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| 267 | WRITE(numout,*) ' day: ', ndastp , TRIM(sf(jf)%clvar), ' * ', zfact |
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| 268 | CALL prihre( sf(jf)%fnow, jpi, jpj, 1, jpi, 20, 1, jpj, 10, zfact, numout ) |
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| 269 | END DO |
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| 270 | CALL FLUSH(numout) |
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| 271 | ENDIF |
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| 272 | ! |
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| 273 | IF( ln_shelf_flx .AND. ln_readtau ) THEN |
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| 274 | CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j ) |
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| 275 | ENDIF |
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| 276 | ! |
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| 277 | ENDIF |
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| 278 | ! |
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| 279 | END SUBROUTINE sbc_flx |
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| 280 | |
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| 281 | !!====================================================================== |
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| 282 | END MODULE sbcflx |
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