- Timestamp:
- 2015-07-10T13:28:53+02:00 (9 years ago)
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branches/2014/dev_r4765_CNRS_agrif/NEMOGCM/NEMO/OPA_SRC/ZDF/zdfddm.F90
r4624 r5581 6 6 !! History : OPA ! 2000-08 (G. Madec) double diffusive mixing 7 7 !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module 8 !! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase 8 !! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase 9 !! 3.6 ! 2013-04 (G. Madec, F. Roquet) zrau compute locally using interpolation of alpha & beta 9 10 !!---------------------------------------------------------------------- 10 11 #if defined key_zdfddm || defined key_esopa … … 18 19 USE dom_oce ! ocean space and time domain variables 19 20 USE zdf_oce ! ocean vertical physics variables 21 USE eosbn2 ! equation of state 22 ! 20 23 USE in_out_manager ! I/O manager 21 24 USE lbclnk ! ocean lateral boundary conditions (or mpp link) … … 34 37 LOGICAL , PUBLIC, PARAMETER :: lk_zdfddm = .TRUE. !: double diffusive mixing flag 35 38 36 REAL(wp), PUBLIC, SAVE, ALLOCATABLE, DIMENSION(:,:,:) :: avs !: salinity vertical diffusivity coeff. at w-point 37 REAL(wp), PUBLIC, SAVE, ALLOCATABLE, DIMENSION(:,:,:) :: rrau !: heat/salt buoyancy flux ratio 38 39 ! !!* Namelist namzdf_ddm : double diffusive mixing * 40 REAL(wp) :: rn_avts ! maximum value of avs for salt fingering 41 REAL(wp) :: rn_hsbfr ! heat/salt buoyancy flux ratio 39 REAL(wp), PUBLIC, SAVE, ALLOCATABLE, DIMENSION(:,:,:) :: avs !: salinity vertical diffusivity coeff. at w-point 40 41 ! !!* Namelist namzdf_ddm : double diffusive mixing * 42 REAL(wp) :: rn_avts ! maximum value of avs for salt fingering 43 REAL(wp) :: rn_hsbfr ! heat/salt buoyancy flux ratio 42 44 43 45 !! * Substitutions 46 # include "domzgr_substitute.h90" 44 47 # include "vectopt_loop_substitute.h90" 45 48 !!---------------------------------------------------------------------- 46 !! NEMO/OPA 4.0 , NEMO Consortium (2011)49 !! NEMO/OPA 3.7 , NEMO Consortium (2014) 47 50 !! $Id$ 48 51 !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) … … 54 57 !! *** ROUTINE zdf_ddm_alloc *** 55 58 !!---------------------------------------------------------------------- 56 ALLOCATE( avs(jpi,jpj,jpk), rrau(jpi,jpj,jpk), STAT= zdf_ddm_alloc ) 57 ! 59 ALLOCATE( avs(jpi,jpj,jpk) , STAT= zdf_ddm_alloc ) 58 60 IF( lk_mpp ) CALL mpp_sum ( zdf_ddm_alloc ) 59 61 IF( zdf_ddm_alloc /= 0 ) CALL ctl_warn('zdf_ddm_alloc: failed to allocate arrays') … … 71 73 !! diffusive mixing (i.e. salt fingering and diffusive layering) 72 74 !! following Merryfield et al. (1999). The rate of double diffusive 73 !! mixing depend on the buoyancy ratio: Rrau=alpha/beta dk[T]/dk[S] 74 !! which is computed in rn2.F 75 !! mixing depend on the buoyancy ratio (R=alpha/beta dk[T]/dk[S]): 75 76 !! * salt fingering (Schmitt 1981): 76 !! for R rau > 1 and rn2 > 0 : zavfs = rn_avts / ( 1 + (Rrau/rn_hsbfr)^6 )77 !! for R rau> 1 and rn2 > 0 : zavfs = O78 !! otherwise : zavft = 0.7 zavs / R rau77 !! for R > 1 and rn2 > 0 : zavfs = rn_avts / ( 1 + (R/rn_hsbfr)^6 ) 78 !! for R > 1 and rn2 > 0 : zavfs = O 79 !! otherwise : zavft = 0.7 zavs / R 79 80 !! * diffusive layering (Federov 1988): 80 !! for 0< Rrau < 1 and rn2 > 0 : zavdt = 1.3635e-6 81 !! * exp( 4.6 exp(-0.54 (1/Rrau-1) ) ) 81 !! for 0< R < 1 and N^2 > 0 : zavdt = 1.3635e-6 * exp( 4.6 exp(-0.54 (1/R-1) ) ) 82 82 !! otherwise : zavdt = 0 83 !! for .5 < R rau < 1 and rn2 > 0 : zavds = zavdt (1.885 Rrau-0.85)84 !! for 0 < R rau <.5 and rn2 > 0 : zavds = zavdt 0.15 Rrau83 !! for .5 < R < 1 and N^2 > 0 : zavds = zavdt (1.885 R -0.85) 84 !! for 0 < R <.5 and N^2 > 0 : zavds = zavdt 0.15 R 85 85 !! otherwise : zavds = 0 86 86 !! * update the eddy diffusivity: … … 96 96 ! 97 97 INTEGER :: ji, jj , jk ! dummy loop indices 98 REAL(wp) :: zinr, zrr ! temporary scalars 99 REAL(wp) :: zavft, zavfs ! - - 100 REAL(wp) :: zavdt, zavds ! - - 101 REAL(wp), POINTER, DIMENSION(:,:) :: zmsks, zmskf, zmskd1, zmskd2, zmskd3 98 REAL(wp) :: zaw, zbw, zrw ! local scalars 99 REAL(wp) :: zdt, zds 100 REAL(wp) :: zinr, zrr ! - - 101 REAL(wp) :: zavft, zavfs ! - - 102 REAL(wp) :: zavdt, zavds ! - - 103 REAL(wp), POINTER, DIMENSION(:,:) :: zrau, zmsks, zmskf, zmskd1, zmskd2, zmskd3 102 104 !!---------------------------------------------------------------------- 103 105 ! 104 106 IF( nn_timing == 1 ) CALL timing_start('zdf_ddm') 105 107 ! 106 CALL wrk_alloc( jpi,jpj, z msks, zmskf, zmskd1, zmskd2, zmskd3 )107 108 CALL wrk_alloc( jpi,jpj, zrau, zmsks, zmskf, zmskd1, zmskd2, zmskd3 ) 109 ! 108 110 ! ! =============== 109 111 DO jk = 2, jpkm1 ! Horizontal slab … … 111 113 ! Define the mask 112 114 ! --------------- 113 rrau(:,:,jk) = MAX( 1.e-20, rrau(:,:,jk) ) ! only retains positive value of rrau 115 DO jj = 1, jpj ! R=zrau = (alpha / beta) (dk[t] / dk[s]) 116 DO ji = 1, jpi 117 zrw = ( fsdepw(ji,jj,jk ) - fsdept(ji,jj,jk) ) & 118 & / ( fsdept(ji,jj,jk-1) - fsdept(ji,jj,jk) ) 119 ! 120 zaw = ( rab_n(ji,jj,jk,jp_tem) * (1. - zrw) + rab_n(ji,jj,jk-1,jp_tem) * zrw ) & 121 & * tmask(ji,jj,jk) * tmask(ji,jj,jk-1) 122 zbw = ( rab_n(ji,jj,jk,jp_sal) * (1. - zrw) + rab_n(ji,jj,jk-1,jp_sal) * zrw ) & 123 & * tmask(ji,jj,jk) * tmask(ji,jj,jk-1) 124 ! 125 zdt = zaw * ( tsn(ji,jj,jk-1,jp_tem) - tsn(ji,jj,jk,jp_tem) ) 126 zds = zbw * ( tsn(ji,jj,jk-1,jp_sal) - tsn(ji,jj,jk,jp_sal) ) 127 IF( ABS( zds) <= 1.e-20_wp ) zds = 1.e-20_wp 128 zrau(ji,jj) = MAX( 1.e-20, zdt / zds ) ! only retains positive value of zrau 129 END DO 130 END DO 114 131 115 132 DO jj = 1, jpj ! indicators: … … 119 136 ELSE ; zmsks(ji,jj) = 1._wp 120 137 ENDIF 121 ! salt fingering indicator: msksf=1 if rrau>1; 0 elsewhere122 IF( rrau(ji,jj,jk) <= 1.) THEN ; zmskf(ji,jj) = 0._wp138 ! salt fingering indicator: msksf=1 if R>1; 0 elsewhere 139 IF( zrau(ji,jj) <= 1. ) THEN ; zmskf(ji,jj) = 0._wp 123 140 ELSE ; zmskf(ji,jj) = 1._wp 124 141 ENDIF 125 142 ! diffusive layering indicators: 126 ! ! mskdl1=1 if 0< rrau<1; 0 elsewhere127 IF( rrau(ji,jj,jk) >= 1.) THEN ; zmskd1(ji,jj) = 0._wp143 ! ! mskdl1=1 if 0< R <1; 0 elsewhere 144 IF( zrau(ji,jj) >= 1. ) THEN ; zmskd1(ji,jj) = 0._wp 128 145 ELSE ; zmskd1(ji,jj) = 1._wp 129 146 ENDIF 130 ! ! mskdl2=1 if 0< rrau<0.5; 0 elsewhere131 IF( rrau(ji,jj,jk) >= 0.5) THEN ; zmskd2(ji,jj) = 0._wp147 ! ! mskdl2=1 if 0< R <0.5; 0 elsewhere 148 IF( zrau(ji,jj) >= 0.5 ) THEN ; zmskd2(ji,jj) = 0._wp 132 149 ELSE ; zmskd2(ji,jj) = 1._wp 133 150 ENDIF 134 ! mskdl3=1 if 0.5< rrau<1; 0 elsewhere135 IF( rrau(ji,jj,jk) <= 0.5 .OR. rrau(ji,jj,jk) >= 1. ) THEN ; zmskd3(ji,jj) = 0._wp136 ELSE 151 ! mskdl3=1 if 0.5< R <1; 0 elsewhere 152 IF( zrau(ji,jj) <= 0.5 .OR. zrau(ji,jj) >= 1. ) THEN ; zmskd3(ji,jj) = 0._wp 153 ELSE ; zmskd3(ji,jj) = 1._wp 137 154 ENDIF 138 155 END DO 139 156 END DO 140 157 ! mask zmsk in order to have avt and avs masked 141 zmsks(:,:) = zmsks(:,:) * tmask(:,:,jk)158 zmsks(:,:) = zmsks(:,:) * wmask(:,:,jk) 142 159 143 160 … … 149 166 !CDIR NOVERRCHK 150 167 DO ji = 1, jpi 151 zinr = 1. /rrau(ji,jj,jk)168 zinr = 1._wp / zrau(ji,jj) 152 169 ! salt fingering 153 zrr = rrau(ji,jj,jk)/rn_hsbfr170 zrr = zrau(ji,jj) / rn_hsbfr 154 171 zrr = zrr * zrr 155 172 zavfs = rn_avts / ( 1 + zrr*zrr*zrr ) * zmsks(ji,jj) * zmskf(ji,jj) … … 157 174 ! diffusive layering 158 175 zavdt = 1.3635e-6 * EXP( 4.6 * EXP( -0.54*(zinr-1.) ) ) * zmsks(ji,jj) * zmskd1(ji,jj) 159 zavds = zavdt * zmsks(ji,jj) * ( ( 1.85 * rrau(ji,jj,jk) - 0.85 ) * zmskd3(ji,jj) &160 & + 0.15 * rrau(ji,jj,jk) * zmskd2(ji,jj) )176 zavds = zavdt * zmsks(ji,jj) * ( ( 1.85 * zrau(ji,jj) - 0.85 ) * zmskd3(ji,jj) & 177 & + 0.15 * zrau(ji,jj) * zmskd2(ji,jj) ) 161 178 ! add to the eddy viscosity coef. previously computed 162 179 avs (ji,jj,jk) = avt(ji,jj,jk) + zavfs + zavds … … 174 191 avmu(ji,jj,jk) = MAX( avmu(ji,jj,jk), & 175 192 & avt(ji,jj,jk), avt(ji+1,jj,jk), & 176 & avs(ji,jj,jk), avs(ji+1,jj,jk) ) * umask(ji,jj,jk)193 & avs(ji,jj,jk), avs(ji+1,jj,jk) ) * wumask(ji,jj,jk) 177 194 avmv(ji,jj,jk) = MAX( avmv(ji,jj,jk), & 178 195 & avt(ji,jj,jk), avt(ji,jj+1,jk), & 179 & avs(ji,jj,jk), avs(ji,jj+1,jk) ) * vmask(ji,jj,jk)196 & avs(ji,jj,jk), avs(ji,jj+1,jk) ) * wvmask(ji,jj,jk) 180 197 END DO 181 198 END DO … … 196 213 ENDIF 197 214 ! 198 CALL wrk_dealloc( jpi,jpj, z msks, zmskf, zmskd1, zmskd2, zmskd3 )215 CALL wrk_dealloc( jpi,jpj, zrau, zmsks, zmskf, zmskd1, zmskd2, zmskd3 ) 199 216 ! 200 217 IF( nn_timing == 1 ) CALL timing_stop('zdf_ddm') … … 212 229 !! called by zdf_ddm at the first timestep (nit000) 213 230 !!---------------------------------------------------------------------- 231 INTEGER :: ios ! local integer 232 !! 214 233 NAMELIST/namzdf_ddm/ rn_avts, rn_hsbfr 215 INTEGER :: ios ! Local integer output status for namelist read216 234 !!---------------------------------------------------------------------- 217 235 ! … … 237 255 IF( zdf_ddm_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_ddm_init : unable to allocate arrays' ) 238 256 ! ! initialization to masked Kz 239 avs(:,:,:) = rn_avt0 * tmask(:,:,:)257 avs(:,:,:) = rn_avt0 * wmask(:,:,:) 240 258 ! 241 259 END SUBROUTINE zdf_ddm_init
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