[3] | 1 | MODULE zdfbfr |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfbfr *** |
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| 4 | !! Ocean physics: Bottom friction |
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| 5 | !!====================================================================== |
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[1662] | 6 | !! History : OPA ! 1997-06 (G. Madec, A.-M. Treguier) Original code |
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[1601] | 7 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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[1708] | 8 | !! 3.2 ! 2009-09 (A.C.Coward) Correction to include barotropic contribution |
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[2528] | 9 | !! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase |
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[3633] | 10 | !! 3.4 ! 2011-11 (H. Liu) implementation of semi-implicit bottom friction option |
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| 11 | !! ! 2012-06 (H. Liu) implementation of Log Layer bottom friction option |
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[1601] | 12 | !!---------------------------------------------------------------------- |
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[3] | 13 | |
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| 14 | !!---------------------------------------------------------------------- |
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[4381] | 15 | !! zdf_bfr : update bottom friction coefficient (non-linear bottom friction only) |
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[1601] | 16 | !! zdf_bfr_init : read in namelist and control the bottom friction parameters. |
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[3] | 17 | !!---------------------------------------------------------------------- |
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| 18 | USE oce ! ocean dynamics and tracers variables |
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[3764] | 19 | USE dom_oce ! ocean space and time domain variables |
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[3] | 20 | USE zdf_oce ! ocean vertical physics variables |
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| 21 | USE in_out_manager ! I/O manager |
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| 22 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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[1671] | 23 | USE lib_mpp ! distributed memory computing |
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[258] | 24 | USE prtctl ! Print control |
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[3294] | 25 | USE timing ! Timing |
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[4381] | 26 | USE wrk_nemo ! Memory Allocation |
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[3633] | 27 | USE phycst, ONLY: vkarmn |
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| 28 | |
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[3] | 29 | IMPLICIT NONE |
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| 30 | PRIVATE |
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| 31 | |
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[2528] | 32 | PUBLIC zdf_bfr ! called by step.F90 |
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[4381] | 33 | PUBLIC zdf_bfr_init ! called by nemogcm.F90 |
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[2715] | 34 | |
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[4147] | 35 | ! !!* Namelist nambfr: bottom friction namelist * |
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| 36 | INTEGER , PUBLIC :: nn_bfr ! = 0/1/2/3 type of bottom friction (PUBLIC for TAM) |
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| 37 | REAL(wp), PUBLIC :: rn_bfri1 ! bottom drag coefficient (linear case) (PUBLIC for TAM) |
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| 38 | REAL(wp), PUBLIC :: rn_bfri2 ! bottom drag coefficient (non linear case) (PUBLIC for TAM) |
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[4381] | 39 | REAL(wp), PUBLIC :: rn_bfri2_max ! Maximum bottom drag coefficient (non linear case and ln_loglayer=T) (PUBLIC for TAM) |
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[4147] | 40 | REAL(wp), PUBLIC :: rn_bfeb2 ! background bottom turbulent kinetic energy [m2/s2] (PUBLIC for TAM) |
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| 41 | REAL(wp), PUBLIC :: rn_bfrien ! local factor to enhance coefficient bfri (PUBLIC for TAM) |
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| 42 | LOGICAL , PUBLIC :: ln_bfr2d ! logical switch for 2D enhancement (PUBLIC for TAM) |
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[4990] | 43 | REAL(wp), PUBLIC :: rn_tfri1 ! top drag coefficient (linear case) (PUBLIC for TAM) |
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| 44 | REAL(wp), PUBLIC :: rn_tfri2 ! top drag coefficient (non linear case) (PUBLIC for TAM) |
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| 45 | REAL(wp), PUBLIC :: rn_tfri2_max ! Maximum top drag coefficient (non linear case and ln_loglayer=T) (PUBLIC for TAM) |
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| 46 | REAL(wp), PUBLIC :: rn_tfeb2 ! background top turbulent kinetic energy [m2/s2] (PUBLIC for TAM) |
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| 47 | REAL(wp), PUBLIC :: rn_tfrien ! local factor to enhance coefficient tfri (PUBLIC for TAM) |
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| 48 | LOGICAL , PUBLIC :: ln_tfr2d ! logical switch for 2D enhancement (PUBLIC for TAM) |
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| 49 | |
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[4147] | 50 | LOGICAL , PUBLIC :: ln_loglayer ! switch for log layer bfr coeff. (PUBLIC for TAM) |
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| 51 | REAL(wp), PUBLIC :: rn_bfrz0 ! bottom roughness for loglayer bfr coeff (PUBLIC for TAM) |
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[4990] | 52 | REAL(wp), PUBLIC :: rn_tfrz0 ! bottom roughness for loglayer bfr coeff (PUBLIC for TAM) |
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[4381] | 53 | LOGICAL , PUBLIC :: ln_bfrimp ! logical switch for implicit bottom friction |
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[4990] | 54 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: bfrcoef2d, tfrcoef2d ! 2D bottom/top drag coefficient (PUBLIC for TAM) |
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[3] | 55 | |
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| 56 | !! * Substitutions |
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[2528] | 57 | # include "vectopt_loop_substitute.h90" |
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[3] | 58 | # include "domzgr_substitute.h90" |
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| 59 | !!---------------------------------------------------------------------- |
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[2715] | 60 | !! NEMO/OPA 4.0 , NEMO Consortium (2011) |
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[2528] | 61 | !! $Id$ |
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| 62 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 63 | !!---------------------------------------------------------------------- |
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| 64 | CONTAINS |
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| 65 | |
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[2715] | 66 | INTEGER FUNCTION zdf_bfr_alloc() |
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| 67 | !!---------------------------------------------------------------------- |
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| 68 | !! *** FUNCTION zdf_bfr_alloc *** |
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| 69 | !!---------------------------------------------------------------------- |
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[4990] | 70 | ALLOCATE( bfrcoef2d(jpi,jpj), tfrcoef2d(jpi,jpj), STAT=zdf_bfr_alloc ) |
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[2715] | 71 | ! |
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| 72 | IF( lk_mpp ) CALL mpp_sum ( zdf_bfr_alloc ) |
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| 73 | IF( zdf_bfr_alloc /= 0 ) CALL ctl_warn('zdf_bfr_alloc: failed to allocate arrays.') |
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| 74 | END FUNCTION zdf_bfr_alloc |
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| 75 | |
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| 76 | |
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[3] | 77 | SUBROUTINE zdf_bfr( kt ) |
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| 78 | !!---------------------------------------------------------------------- |
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| 79 | !! *** ROUTINE zdf_bfr *** |
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[3764] | 80 | !! |
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[1708] | 81 | !! ** Purpose : compute the bottom friction coefficient. |
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[3] | 82 | !! |
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[3764] | 83 | !! ** Method : Calculate and store part of the momentum trend due |
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| 84 | !! to bottom friction following the chosen friction type |
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[1662] | 85 | !! (free-slip, linear, or quadratic). The component |
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| 86 | !! calculated here is multiplied by the bottom velocity in |
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| 87 | !! dyn_bfr to provide the trend term. |
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[1708] | 88 | !! The coefficients are updated at each time step only |
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| 89 | !! in the quadratic case. |
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[1662] | 90 | !! |
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| 91 | !! ** Action : bfrua , bfrva bottom friction coefficients |
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[3] | 92 | !!---------------------------------------------------------------------- |
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| 93 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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[1601] | 94 | !! |
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[3633] | 95 | INTEGER :: ji, jj ! dummy loop indices |
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[4381] | 96 | INTEGER :: ikbt, ikbu, ikbv ! local integers |
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| 97 | REAL(wp) :: zvu, zuv, zecu, zecv, ztmp ! temporary scalars |
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[4990] | 98 | REAL(wp), POINTER, DIMENSION(:,:) :: zbfrt, ztfrt |
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[3] | 99 | !!---------------------------------------------------------------------- |
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[3294] | 100 | ! |
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| 101 | IF( nn_timing == 1 ) CALL timing_start('zdf_bfr') |
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| 102 | ! |
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[4381] | 103 | IF( kt == nit000 .AND. lwp ) THEN |
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| 104 | WRITE(numout,*) |
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| 105 | WRITE(numout,*) 'zdf_bfr : Set bottom friction coefficient (non-linear case)' |
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| 106 | WRITE(numout,*) '~~~~~~~~' |
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| 107 | ENDIF |
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| 108 | ! |
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| 109 | IF( nn_bfr == 2 ) THEN ! quadratic bottom friction only |
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[1662] | 110 | ! |
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[4990] | 111 | CALL wrk_alloc( jpi, jpj, zbfrt, ztfrt ) |
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[3633] | 112 | |
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[4381] | 113 | IF ( ln_loglayer.AND.lk_vvl ) THEN ! "log layer" bottom friction coefficient |
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[3820] | 114 | |
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[4381] | 115 | DO jj = 1, jpj |
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| 116 | DO ji = 1, jpi |
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| 117 | ikbt = mbkt(ji,jj) |
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[4990] | 118 | !! JC: possible WAD implementation should modify line below if layers vanish |
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[4381] | 119 | ztmp = tmask(ji,jj,ikbt) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_bfrz0 ))**2._wp |
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| 120 | zbfrt(ji,jj) = MAX(bfrcoef2d(ji,jj), ztmp) |
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| 121 | zbfrt(ji,jj) = MIN(zbfrt(ji,jj), rn_bfri2_max) |
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[5120] | 122 | END DO |
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| 123 | END DO |
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[4990] | 124 | ! (ISF) |
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[5120] | 125 | IF ( ln_isfcav ) THEN |
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| 126 | DO jj = 1, jpj |
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| 127 | DO ji = 1, jpi |
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| 128 | ikbt = mikt(ji,jj) |
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[4990] | 129 | ! JC: possible WAD implementation should modify line below if layers vanish |
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[5120] | 130 | ztmp = (1-tmask(ji,jj,1)) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_bfrz0 ))**2._wp |
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| 131 | ztfrt(ji,jj) = MAX(tfrcoef2d(ji,jj), ztmp) |
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| 132 | ztfrt(ji,jj) = MIN(ztfrt(ji,jj), rn_tfri2_max) |
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| 133 | END DO |
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[4381] | 134 | END DO |
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[5120] | 135 | END IF |
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[4381] | 136 | ! |
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| 137 | ELSE |
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| 138 | zbfrt(:,:) = bfrcoef2d(:,:) |
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[4990] | 139 | ztfrt(:,:) = tfrcoef2d(:,:) |
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[3633] | 140 | ENDIF |
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| 141 | |
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[3] | 142 | DO jj = 2, jpjm1 |
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| 143 | DO ji = 2, jpim1 |
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[3764] | 144 | ikbu = mbku(ji,jj) ! ocean bottom level at u- and v-points |
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[2528] | 145 | ikbv = mbkv(ji,jj) ! (deepest ocean u- and v-points) |
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[1662] | 146 | ! |
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[2528] | 147 | zvu = 0.25 * ( vn(ji,jj ,ikbu) + vn(ji+1,jj ,ikbu) & |
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| 148 | & + vn(ji,jj-1,ikbu) + vn(ji+1,jj-1,ikbu) ) |
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| 149 | zuv = 0.25 * ( un(ji,jj ,ikbv) + un(ji-1,jj ,ikbv) & |
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| 150 | & + un(ji,jj+1,ikbv) + un(ji-1,jj+1,ikbv) ) |
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[1662] | 151 | ! |
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[2528] | 152 | zecu = SQRT( un(ji,jj,ikbu) * un(ji,jj,ikbu) + zvu*zvu + rn_bfeb2 ) |
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| 153 | zecv = SQRT( vn(ji,jj,ikbv) * vn(ji,jj,ikbv) + zuv*zuv + rn_bfeb2 ) |
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[1662] | 154 | ! |
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[4381] | 155 | bfrua(ji,jj) = - 0.5_wp * ( zbfrt(ji,jj) + zbfrt(ji+1,jj ) ) * zecu |
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| 156 | bfrva(ji,jj) = - 0.5_wp * ( zbfrt(ji,jj) + zbfrt(ji ,jj+1) ) * zecv |
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[4990] | 157 | ! |
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| 158 | ! in case of 2 cell water column, we assume each cell feels the top and bottom friction |
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[5120] | 159 | IF ( ln_isfcav ) THEN |
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| 160 | IF ( miku(ji,jj) + 1 .GE. mbku(ji,jj) ) THEN |
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| 161 | bfrua(ji,jj) = - 0.5_wp * ( ( zbfrt(ji,jj) + zbfrt(ji+1,jj ) ) & |
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| 162 | & + ( ztfrt(ji,jj) + ztfrt(ji+1,jj ) ) ) & |
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| 163 | & * zecu * (1._wp - umask(ji,jj,1)) |
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| 164 | END IF |
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| 165 | IF ( mikv(ji,jj) + 1 .GE. mbkv(ji,jj) ) THEN |
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| 166 | bfrva(ji,jj) = - 0.5_wp * ( ( zbfrt(ji,jj) + zbfrt(ji ,jj+1) ) & |
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| 167 | & + ( ztfrt(ji,jj) + ztfrt(ji ,jj+1) ) ) & |
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| 168 | & * zecv * (1._wp - vmask(ji,jj,1)) |
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| 169 | END IF |
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[4990] | 170 | END IF |
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[3] | 171 | END DO |
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| 172 | END DO |
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[5332] | 173 | CALL lbc_lnk( bfrua, 'U', 1. ) ; CALL lbc_lnk( bfrva, 'V', 1. ) ! Lateral boundary condition |
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| 174 | |
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[5120] | 175 | IF ( ln_isfcav ) THEN |
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| 176 | DO jj = 2, jpjm1 |
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| 177 | DO ji = 2, jpim1 |
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| 178 | ! (ISF) ======================================================================== |
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[5332] | 179 | ikbu = miku(ji,jj) ! ocean top level at u- and v-points |
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| 180 | ikbv = mikv(ji,jj) ! (1st wet ocean u- and v-points) |
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[5120] | 181 | ! |
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| 182 | zvu = 0.25 * ( vn(ji,jj ,ikbu) + vn(ji+1,jj ,ikbu) & |
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| 183 | & + vn(ji,jj-1,ikbu) + vn(ji+1,jj-1,ikbu) ) |
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| 184 | zuv = 0.25 * ( un(ji,jj ,ikbv) + un(ji-1,jj ,ikbv) & |
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| 185 | & + un(ji,jj+1,ikbv) + un(ji-1,jj+1,ikbv) ) |
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| 186 | ! |
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[5332] | 187 | zecu = SQRT( un(ji,jj,ikbu) * un(ji,jj,ikbu) + zvu*zvu + rn_tfeb2 ) |
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| 188 | zecv = SQRT( vn(ji,jj,ikbv) * vn(ji,jj,ikbv) + zuv*zuv + rn_tfeb2 ) |
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[5120] | 189 | ! |
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| 190 | tfrua(ji,jj) = - 0.5_wp * ( ztfrt(ji,jj) + ztfrt(ji+1,jj ) ) * zecu * (1._wp - umask(ji,jj,1)) |
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| 191 | tfrva(ji,jj) = - 0.5_wp * ( ztfrt(ji,jj) + ztfrt(ji ,jj+1) ) * zecv * (1._wp - vmask(ji,jj,1)) |
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| 192 | ! (ISF) END ==================================================================== |
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| 193 | ! in case of 2 cell water column, we assume each cell feels the top and bottom friction |
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| 194 | IF ( miku(ji,jj) + 1 .GE. mbku(ji,jj) ) THEN |
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| 195 | tfrua(ji,jj) = - 0.5_wp * ( ( ztfrt(ji,jj) + ztfrt(ji+1,jj ) ) & |
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| 196 | & + ( zbfrt(ji,jj) + zbfrt(ji+1,jj ) ) ) & |
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| 197 | & * zecu * (1._wp - umask(ji,jj,1)) |
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| 198 | END IF |
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| 199 | IF ( mikv(ji,jj) + 1 .GE. mbkv(ji,jj) ) THEN |
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| 200 | tfrva(ji,jj) = - 0.5_wp * ( ( ztfrt(ji,jj) + ztfrt(ji ,jj+1) ) & |
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| 201 | & + ( zbfrt(ji,jj) + zbfrt(ji ,jj+1) ) ) & |
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| 202 | & * zecv * (1._wp - vmask(ji,jj,1)) |
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| 203 | END IF |
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| 204 | END DO |
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| 205 | END DO |
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[5332] | 206 | CALL lbc_lnk( tfrua, 'U', 1. ) ; CALL lbc_lnk( tfrva, 'V', 1. ) ! Lateral boundary condition |
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[5120] | 207 | END IF |
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[1601] | 208 | ! |
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[1708] | 209 | ! |
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| 210 | IF(ln_ctl) CALL prt_ctl( tab2d_1=bfrua, clinfo1=' bfr - u: ', mask1=umask, & |
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| 211 | & tab2d_2=bfrva, clinfo2= ' v: ', mask2=vmask,ovlap=1 ) |
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[4990] | 212 | CALL wrk_dealloc( jpi,jpj,zbfrt, ztfrt ) |
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[1662] | 213 | ENDIF |
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| 214 | ! |
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[3294] | 215 | IF( nn_timing == 1 ) CALL timing_stop('zdf_bfr') |
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| 216 | ! |
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[3] | 217 | END SUBROUTINE zdf_bfr |
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| 218 | |
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| 219 | |
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| 220 | SUBROUTINE zdf_bfr_init |
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| 221 | !!---------------------------------------------------------------------- |
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| 222 | !! *** ROUTINE zdf_bfr_init *** |
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[3764] | 223 | !! |
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[3] | 224 | !! ** Purpose : Initialization of the bottom friction |
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| 225 | !! |
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[4381] | 226 | !! ** Method : Read the nambfr namelist and check their consistency |
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| 227 | !! called at the first timestep (nit000) |
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[3] | 228 | !!---------------------------------------------------------------------- |
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[1662] | 229 | USE iom ! I/O module for ehanced bottom friction file |
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| 230 | !! |
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[3633] | 231 | INTEGER :: inum ! logical unit for enhanced bottom friction file |
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| 232 | INTEGER :: ji, jj ! dummy loop indexes |
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[4381] | 233 | INTEGER :: ikbt, ikbu, ikbv ! temporary integers |
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| 234 | INTEGER :: ictu, ictv ! - - |
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[4147] | 235 | INTEGER :: ios |
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[3633] | 236 | REAL(wp) :: zminbfr, zmaxbfr ! temporary scalars |
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[4990] | 237 | REAL(wp) :: zmintfr, zmaxtfr ! temporary scalars |
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[4381] | 238 | REAL(wp) :: ztmp, zfru, zfrv ! - - |
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[1708] | 239 | !! |
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[4381] | 240 | NAMELIST/nambfr/ nn_bfr, rn_bfri1, rn_bfri2, rn_bfri2_max, rn_bfeb2, rn_bfrz0, ln_bfr2d, & |
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[4990] | 241 | & rn_tfri1, rn_tfri2, rn_tfri2_max, rn_tfeb2, rn_tfrz0, ln_tfr2d, & |
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| 242 | & rn_bfrien, rn_tfrien, ln_bfrimp, ln_loglayer |
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[3] | 243 | !!---------------------------------------------------------------------- |
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[3294] | 244 | ! |
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| 245 | IF( nn_timing == 1 ) CALL timing_start('zdf_bfr_init') |
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| 246 | ! |
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[4381] | 247 | ! !* Allocate zdfbfr arrays |
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| 248 | IF( zdf_bfr_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_bfr_init : unable to allocate arrays' ) |
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| 249 | ! |
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| 250 | ! !* Parameter control and print |
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| 251 | ! |
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[4147] | 252 | REWIND( numnam_ref ) ! Namelist nambfr in reference namelist : Bottom momentum boundary condition |
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| 253 | READ ( numnam_ref, nambfr, IOSTAT = ios, ERR = 901) |
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| 254 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nambfr in reference namelist', lwp ) |
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[3] | 255 | |
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[4147] | 256 | REWIND( numnam_cfg ) ! Namelist nambfr in configuration namelist : Bottom momentum boundary condition |
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| 257 | READ ( numnam_cfg, nambfr, IOSTAT = ios, ERR = 902 ) |
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| 258 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nambfr in configuration namelist', lwp ) |
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[4624] | 259 | IF(lwm) WRITE ( numond, nambfr ) |
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[1662] | 260 | IF(lwp) WRITE(numout,*) |
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[4381] | 261 | IF(lwp) WRITE(numout,*) 'zdf_bfr_init : momentum bottom friction' |
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| 262 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~' |
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[1708] | 263 | IF(lwp) WRITE(numout,*) ' Namelist nam_bfr : set bottom friction parameters' |
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[4381] | 264 | ! |
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[1662] | 265 | SELECT CASE (nn_bfr) |
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[2715] | 266 | ! |
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[3] | 267 | CASE( 0 ) |
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[1708] | 268 | IF(lwp) WRITE(numout,*) ' free-slip ' |
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[1662] | 269 | bfrua(:,:) = 0.e0 |
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| 270 | bfrva(:,:) = 0.e0 |
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[4990] | 271 | tfrua(:,:) = 0.e0 |
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| 272 | tfrva(:,:) = 0.e0 |
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[1662] | 273 | ! |
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[3] | 274 | CASE( 1 ) |
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[1708] | 275 | IF(lwp) WRITE(numout,*) ' linear botton friction' |
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[4990] | 276 | IF(lwp) WRITE(numout,*) ' bottom friction coef. rn_bfri1 = ', rn_bfri1 |
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[1708] | 277 | IF( ln_bfr2d ) THEN |
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| 278 | IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_bfr2d = ', ln_bfr2d |
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| 279 | IF(lwp) WRITE(numout,*) ' coef rn_bfri2 enhancement factor rn_bfrien = ',rn_bfrien |
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[1662] | 280 | ENDIF |
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[5332] | 281 | IF ( ln_isfcav ) THEN |
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| 282 | IF(lwp) WRITE(numout,*) ' top friction coef. rn_bfri1 = ', rn_tfri1 |
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| 283 | IF( ln_tfr2d ) THEN |
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| 284 | IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_tfr2d = ', ln_tfr2d |
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| 285 | IF(lwp) WRITE(numout,*) ' coef rn_tfri2 enhancement factor rn_tfrien = ',rn_tfrien |
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| 286 | ENDIF |
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| 287 | END IF |
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[1601] | 288 | ! |
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[3764] | 289 | IF(ln_bfr2d) THEN |
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[1662] | 290 | ! bfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement |
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| 291 | CALL iom_open('bfr_coef.nc',inum) |
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| 292 | CALL iom_get (inum, jpdom_data, 'bfr_coef',bfrcoef2d,1) ! bfrcoef2d is used as tmp array |
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| 293 | CALL iom_close(inum) |
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[2715] | 294 | bfrcoef2d(:,:) = rn_bfri1 * ( 1 + rn_bfrien * bfrcoef2d(:,:) ) |
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[4381] | 295 | ELSE |
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| 296 | bfrcoef2d(:,:) = rn_bfri1 ! initialize bfrcoef2d to the namelist variable |
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[1662] | 297 | ENDIF |
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[4381] | 298 | ! |
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[1662] | 299 | bfrua(:,:) = - bfrcoef2d(:,:) |
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| 300 | bfrva(:,:) = - bfrcoef2d(:,:) |
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| 301 | ! |
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[5332] | 302 | IF ( ln_isfcav ) THEN |
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| 303 | IF(ln_tfr2d) THEN |
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| 304 | ! tfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement |
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| 305 | CALL iom_open('tfr_coef.nc',inum) |
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| 306 | CALL iom_get (inum, jpdom_data, 'tfr_coef',tfrcoef2d,1) ! tfrcoef2d is used as tmp array |
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| 307 | CALL iom_close(inum) |
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| 308 | tfrcoef2d(:,:) = rn_tfri1 * ( 1 + rn_tfrien * tfrcoef2d(:,:) ) |
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| 309 | ELSE |
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| 310 | tfrcoef2d(:,:) = rn_tfri1 ! initialize tfrcoef2d to the namelist variable |
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| 311 | ENDIF |
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| 312 | ! |
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| 313 | tfrua(:,:) = - tfrcoef2d(:,:) |
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| 314 | tfrva(:,:) = - tfrcoef2d(:,:) |
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| 315 | END IF |
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| 316 | ! |
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[3] | 317 | CASE( 2 ) |
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[4381] | 318 | IF(lwp) WRITE(numout,*) ' quadratic bottom friction' |
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[1708] | 319 | IF(lwp) WRITE(numout,*) ' friction coef. rn_bfri2 = ', rn_bfri2 |
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[4381] | 320 | IF(lwp) WRITE(numout,*) ' Max. coef. (log case) rn_bfri2_max = ', rn_bfri2_max |
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[1708] | 321 | IF(lwp) WRITE(numout,*) ' background tke rn_bfeb2 = ', rn_bfeb2 |
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[4381] | 322 | IF(lwp) WRITE(numout,*) ' log formulation ln_bfr2d = ', ln_loglayer |
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| 323 | IF(lwp) WRITE(numout,*) ' bottom roughness rn_bfrz0 [m] = ', rn_bfrz0 |
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| 324 | IF( rn_bfrz0<=0.e0 ) THEN |
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| 325 | WRITE(ctmp1,*) ' bottom roughness must be strictly positive' |
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| 326 | CALL ctl_stop( ctmp1 ) |
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| 327 | ENDIF |
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[1708] | 328 | IF( ln_bfr2d ) THEN |
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| 329 | IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_bfr2d = ', ln_bfr2d |
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| 330 | IF(lwp) WRITE(numout,*) ' coef rn_bfri2 enhancement factor rn_bfrien = ',rn_bfrien |
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[1662] | 331 | ENDIF |
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[5332] | 332 | IF ( ln_isfcav ) THEN |
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| 333 | IF(lwp) WRITE(numout,*) ' quadratic top friction' |
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| 334 | IF(lwp) WRITE(numout,*) ' friction coef. rn_tfri2 = ', rn_tfri2 |
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| 335 | IF(lwp) WRITE(numout,*) ' Max. coef. (log case) rn_tfri2_max = ', rn_tfri2_max |
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| 336 | IF(lwp) WRITE(numout,*) ' background tke rn_tfeb2 = ', rn_tfeb2 |
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| 337 | IF(lwp) WRITE(numout,*) ' log formulation ln_tfr2d = ', ln_loglayer |
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| 338 | IF(lwp) WRITE(numout,*) ' top roughness rn_tfrz0 [m] = ', rn_tfrz0 |
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| 339 | IF( rn_tfrz0<=0.e0 ) THEN |
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| 340 | WRITE(ctmp1,*) ' top roughness must be strictly positive' |
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| 341 | CALL ctl_stop( ctmp1 ) |
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| 342 | ENDIF |
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| 343 | IF( ln_tfr2d ) THEN |
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| 344 | IF(lwp) WRITE(numout,*) ' read coef. enhancement distribution from file ln_tfr2d = ', ln_tfr2d |
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| 345 | IF(lwp) WRITE(numout,*) ' coef rn_tfri2 enhancement factor rn_tfrien = ',rn_tfrien |
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| 346 | ENDIF |
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| 347 | END IF |
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[1708] | 348 | ! |
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[3764] | 349 | IF(ln_bfr2d) THEN |
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[1662] | 350 | ! bfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement |
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| 351 | CALL iom_open('bfr_coef.nc',inum) |
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| 352 | CALL iom_get (inum, jpdom_data, 'bfr_coef',bfrcoef2d,1) ! bfrcoef2d is used as tmp array |
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| 353 | CALL iom_close(inum) |
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[4381] | 354 | ! |
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| 355 | bfrcoef2d(:,:) = rn_bfri2 * ( 1 + rn_bfrien * bfrcoef2d(:,:) ) |
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| 356 | ELSE |
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| 357 | bfrcoef2d(:,:) = rn_bfri2 ! initialize bfrcoef2d to the namelist variable |
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[1662] | 358 | ENDIF |
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[5332] | 359 | |
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| 360 | IF ( ln_isfcav ) THEN |
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| 361 | IF(ln_tfr2d) THEN |
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| 362 | ! tfr_coef is a coefficient in [0,1] giving the mask where to apply the bfr enhancement |
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| 363 | CALL iom_open('tfr_coef.nc',inum) |
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| 364 | CALL iom_get (inum, jpdom_data, 'tfr_coef',tfrcoef2d,1) ! tfrcoef2d is used as tmp array |
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| 365 | CALL iom_close(inum) |
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| 366 | ! |
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| 367 | tfrcoef2d(:,:) = rn_tfri2 * ( 1 + rn_tfrien * tfrcoef2d(:,:) ) |
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| 368 | ELSE |
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| 369 | tfrcoef2d(:,:) = rn_tfri2 ! initialize tfrcoef2d to the namelist variable |
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| 370 | ENDIF |
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| 371 | END IF |
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[1601] | 372 | ! |
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[4381] | 373 | IF ( ln_loglayer.AND.(.NOT.lk_vvl) ) THEN ! set "log layer" bottom friction once for all |
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| 374 | DO jj = 1, jpj |
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| 375 | DO ji = 1, jpi |
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| 376 | ikbt = mbkt(ji,jj) |
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| 377 | ztmp = tmask(ji,jj,ikbt) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_bfrz0 ))**2._wp |
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| 378 | bfrcoef2d(ji,jj) = MAX(bfrcoef2d(ji,jj), ztmp) |
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| 379 | bfrcoef2d(ji,jj) = MIN(bfrcoef2d(ji,jj), rn_bfri2_max) |
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| 380 | END DO |
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| 381 | END DO |
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[5332] | 382 | IF ( ln_isfcav ) THEN |
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| 383 | DO jj = 1, jpj |
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| 384 | DO ji = 1, jpi |
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| 385 | ikbt = mikt(ji,jj) |
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| 386 | ztmp = tmask(ji,jj,ikbt) * ( vkarmn / LOG( 0.5_wp * fse3t_n(ji,jj,ikbt) / rn_tfrz0 ))**2._wp |
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| 387 | tfrcoef2d(ji,jj) = MAX(tfrcoef2d(ji,jj), ztmp) |
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| 388 | tfrcoef2d(ji,jj) = MIN(tfrcoef2d(ji,jj), rn_tfri2_max) |
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| 389 | END DO |
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| 390 | END DO |
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| 391 | END IF |
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[4381] | 392 | ENDIF |
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| 393 | ! |
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[3] | 394 | CASE DEFAULT |
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[1708] | 395 | IF(lwp) WRITE(ctmp1,*) ' bad flag value for nn_bfr = ', nn_bfr |
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[474] | 396 | CALL ctl_stop( ctmp1 ) |
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[1601] | 397 | ! |
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[3] | 398 | END SELECT |
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[4381] | 399 | ! |
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| 400 | IF(lwp) WRITE(numout,*) ' implicit bottom friction switch ln_bfrimp = ', ln_bfrimp |
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| 401 | ! |
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| 402 | ! ! Make sure ln_zdfexp=.false. when use implicit bfr |
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| 403 | IF( ln_bfrimp .AND. ln_zdfexp ) THEN |
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[3820] | 404 | IF(lwp) THEN |
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| 405 | WRITE(numout,*) |
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[4381] | 406 | WRITE(numout,*) 'Implicit bottom friction can only be used when ln_zdfexp=.false.' |
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| 407 | WRITE(numout,*) ' but you set: ln_bfrimp=.true. and ln_zdfexp=.true.!!!!' |
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| 408 | WRITE(ctmp1,*) ' set either ln_zdfexp = .false or ln_bfrimp = .false.' |
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[3820] | 409 | CALL ctl_stop( ctmp1 ) |
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| 410 | END IF |
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| 411 | END IF |
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[1601] | 412 | ! |
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[1662] | 413 | ! Basic stability check on bottom friction coefficient |
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| 414 | ! |
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| 415 | ictu = 0 ! counter for stability criterion breaches at U-pts |
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| 416 | ictv = 0 ! counter for stability criterion breaches at V-pts |
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[1708] | 417 | zminbfr = 1.e10_wp ! initialise tracker for minimum of bottom friction coefficient |
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| 418 | zmaxbfr = -1.e10_wp ! initialise tracker for maximum of bottom friction coefficient |
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[4990] | 419 | zmintfr = 1.e10_wp ! initialise tracker for minimum of bottom friction coefficient |
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| 420 | zmaxtfr = -1.e10_wp ! initialise tracker for maximum of bottom friction coefficient |
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[1662] | 421 | ! |
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| 422 | DO jj = 2, jpjm1 |
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| 423 | DO ji = 2, jpim1 |
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[2528] | 424 | ikbu = mbku(ji,jj) ! deepest ocean level at u- and v-points |
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| 425 | ikbv = mbkv(ji,jj) |
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| 426 | zfru = 0.5 * fse3u(ji,jj,ikbu) / rdt |
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| 427 | zfrv = 0.5 * fse3v(ji,jj,ikbv) / rdt |
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[1708] | 428 | IF( ABS( bfrcoef2d(ji,jj) ) > zfru ) THEN |
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| 429 | IF( ln_ctl ) THEN |
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[2528] | 430 | WRITE(numout,*) 'BFR ', narea, nimpp+ji, njmpp+jj, ikbu |
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| 431 | WRITE(numout,*) 'BFR ', ABS( bfrcoef2d(ji,jj) ), zfru |
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[1662] | 432 | ENDIF |
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| 433 | ictu = ictu + 1 |
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| 434 | ENDIF |
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[1708] | 435 | IF( ABS( bfrcoef2d(ji,jj) ) > zfrv ) THEN |
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| 436 | IF( ln_ctl ) THEN |
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| 437 | WRITE(numout,*) 'BFR ', narea, nimpp+ji, njmpp+jj, ikbv |
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| 438 | WRITE(numout,*) 'BFR ', bfrcoef2d(ji,jj), zfrv |
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[1662] | 439 | ENDIF |
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| 440 | ictv = ictv + 1 |
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| 441 | ENDIF |
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[1708] | 442 | zminbfr = MIN( zminbfr, MIN( zfru, ABS( bfrcoef2d(ji,jj) ) ) ) |
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| 443 | zmaxbfr = MAX( zmaxbfr, MIN( zfrv, ABS( bfrcoef2d(ji,jj) ) ) ) |
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[5332] | 444 | ! (ISF) |
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| 445 | IF ( ln_isfcav ) THEN |
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| 446 | ikbu = miku(ji,jj) ! 1st wet ocean level at u- and v-points |
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| 447 | ikbv = mikv(ji,jj) |
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| 448 | zfru = 0.5 * fse3u(ji,jj,ikbu) / rdt |
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| 449 | zfrv = 0.5 * fse3v(ji,jj,ikbv) / rdt |
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| 450 | IF( ABS( tfrcoef2d(ji,jj) ) > zfru ) THEN |
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| 451 | IF( ln_ctl ) THEN |
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| 452 | WRITE(numout,*) 'TFR ', narea, nimpp+ji, njmpp+jj, ikbu |
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| 453 | WRITE(numout,*) 'TFR ', ABS( tfrcoef2d(ji,jj) ), zfru |
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| 454 | ENDIF |
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| 455 | ictu = ictu + 1 |
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| 456 | ENDIF |
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| 457 | IF( ABS( tfrcoef2d(ji,jj) ) > zfrv ) THEN |
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| 458 | IF( ln_ctl ) THEN |
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| 459 | WRITE(numout,*) 'TFR ', narea, nimpp+ji, njmpp+jj, ikbv |
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| 460 | WRITE(numout,*) 'TFR ', tfrcoef2d(ji,jj), zfrv |
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| 461 | ENDIF |
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| 462 | ictv = ictv + 1 |
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| 463 | ENDIF |
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| 464 | zmintfr = MIN( zmintfr, MIN( zfru, ABS( tfrcoef2d(ji,jj) ) ) ) |
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| 465 | zmaxtfr = MAX( zmaxtfr, MIN( zfrv, ABS( tfrcoef2d(ji,jj) ) ) ) |
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| 466 | END IF |
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| 467 | ! END ISF |
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[1662] | 468 | END DO |
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| 469 | END DO |
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[1708] | 470 | IF( lk_mpp ) THEN |
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[1662] | 471 | CALL mpp_sum( ictu ) |
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| 472 | CALL mpp_sum( ictv ) |
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[1708] | 473 | CALL mpp_min( zminbfr ) |
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| 474 | CALL mpp_max( zmaxbfr ) |
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[5332] | 475 | IF ( ln_isfcav) CALL mpp_min( zmintfr ) |
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| 476 | IF ( ln_isfcav) CALL mpp_max( zmaxtfr ) |
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[1662] | 477 | ENDIF |
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[3294] | 478 | IF( .NOT.ln_bfrimp) THEN |
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[2528] | 479 | IF( lwp .AND. ictu + ictv > 0 ) THEN |
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[5332] | 480 | WRITE(numout,*) ' Bottom/Top friction stability check failed at ', ictu, ' U-points ' |
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| 481 | WRITE(numout,*) ' Bottom/Top friction stability check failed at ', ictv, ' V-points ' |
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[1708] | 482 | WRITE(numout,*) ' Bottom friction coefficient now ranges from: ', zminbfr, ' to ', zmaxbfr |
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[5332] | 483 | IF ( ln_isfcav ) WRITE(numout,*) ' Top friction coefficient now ranges from: ', zmintfr, ' to ', zmaxtfr |
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| 484 | WRITE(numout,*) ' Bottom/Top friction coefficient will be reduced where necessary' |
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[1662] | 485 | ENDIF |
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[3294] | 486 | ENDIF |
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[1662] | 487 | ! |
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[3294] | 488 | IF( nn_timing == 1 ) CALL timing_stop('zdf_bfr_init') |
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| 489 | ! |
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[3] | 490 | END SUBROUTINE zdf_bfr_init |
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| 491 | |
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| 492 | !!====================================================================== |
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| 493 | END MODULE zdfbfr |
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