- Timestamp:
- 2016-11-28T17:04:10+01:00 (7 years ago)
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- 1 edited
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branches/2016/dev_INGV_UKMO_2016/NEMOGCM/NEMO/OPA_SRC/TRA/trasbc.F90
r5643 r7351 13 13 14 14 !!---------------------------------------------------------------------- 15 !! tra_sbc : update the tracer trend at ocean surface 16 !!---------------------------------------------------------------------- 17 USE oce ! ocean dynamics and active tracers 18 USE sbc_oce ! surface boundary condition: ocean 19 USE dom_oce ! ocean space domain variables 20 USE phycst ! physical constant 21 USE sbcmod ! ln_rnf 22 USE sbcrnf ! River runoff 23 USE sbcisf ! Ice shelf 24 USE traqsr ! solar radiation penetration 25 USE trd_oce ! trends: ocean variables 26 USE trdtra ! trends manager: tracers 15 !! tra_sbc : update the tracer trend at ocean surface 16 !!---------------------------------------------------------------------- 17 USE oce ! ocean dynamics and active tracers 18 USE sbc_oce ! surface boundary condition: ocean 19 USE dom_oce ! ocean space domain variables 20 USE phycst ! physical constant 21 USE eosbn2 ! Equation Of State 22 USE sbcmod ! ln_rnf 23 USE sbcrnf ! River runoff 24 USE sbcisf ! Ice shelf 25 USE iscplini ! Ice sheet coupling 26 USE traqsr ! solar radiation penetration 27 USE trd_oce ! trends: ocean variables 28 USE trdtra ! trends manager: tracers 27 29 ! 28 USE in_out_manager ! I/O manager 29 USE prtctl ! Print control 30 USE iom 31 USE lbclnk ! ocean lateral boundary conditions (or mpp link) 32 USE wrk_nemo ! Memory Allocation 33 USE timing ! Timing 34 USE eosbn2 30 USE in_out_manager ! I/O manager 31 USE prtctl ! Print control 32 USE iom ! xIOS server 33 USE lbclnk ! ocean lateral boundary conditions (or mpp link) 34 USE wrk_nemo ! Memory Allocation 35 USE timing ! Timing 35 36 36 37 IMPLICIT NONE 37 38 PRIVATE 38 39 39 PUBLIC tra_sbc 40 PUBLIC tra_sbc ! routine called by step.F90 40 41 41 42 !! * Substitutions 42 # include "domzgr_substitute.h90"43 43 # include "vectopt_loop_substitute.h90" 44 44 !!---------------------------------------------------------------------- … … 57 57 !! and add it to the general trend of tracer equations. 58 58 !! 59 !! ** Method : 60 !! Following Roullet and Madec (2000), the air-sea flux can be divided 61 !! into three effects: (1) Fext, external forcing; 62 !! (2) Fwi, concentration/dilution effect due to water exchanged 63 !! at the surface by evaporation, precipitations and runoff (E-P-R); 64 !! (3) Fwe, tracer carried with the water that is exchanged. 65 !! - salinity : salt flux only due to freezing/melting 66 !! sa = sa + sfx / rau0 / e3t for k=1 59 !! ** Method : The (air+ice)-sea flux has two components: 60 !! (1) Fext, external forcing (i.e. flux through the (air+ice)-sea interface); 61 !! (2) Fwe , tracer carried with the water that is exchanged with air+ice. 62 !! The input forcing fields (emp, rnf, sfx, isf) contain Fext+Fwe, 63 !! they are simply added to the tracer trend (tsa). 64 !! In linear free surface case (ln_linssh=T), the volume of the 65 !! ocean does not change with the water exchanges at the (air+ice)-sea 66 !! interface. Therefore another term has to be added, to mimic the 67 !! concentration/dilution effect associated with water exchanges. 67 68 !! 68 !! Fext, flux through the air-sea interface for temperature and salt: 69 !! - temperature : heat flux q (w/m2). If penetrative solar 70 !! radiation q is only the non solar part of the heat flux, the 71 !! solar part is added in traqsr.F routine. 72 !! ta = ta + q /(rau0 rcp e3t) for k=1 73 !! - salinity : no salt flux 74 !! 75 !! The formulation for Fwb and Fwi vary according to the free 76 !! surface formulation (linear or variable volume). 77 !! * Linear free surface 78 !! The surface freshwater flux modifies the ocean volume 79 !! and thus the concentration of a tracer and the temperature. 80 !! First order of the effect of surface freshwater exchange 81 !! for salinity, it can be neglected on temperature (especially 82 !! as the temperature of precipitations and runoffs is usually 83 !! unknown). 84 !! - temperature : we assume that the temperature of both 85 !! precipitations and runoffs is equal to the SST, thus there 86 !! is no additional flux since in this case, the concentration 87 !! dilution effect is balanced by the net heat flux associated 88 !! to the freshwater exchange (Fwe+Fwi=0): 89 !! (Tp P - Te E) + SST (P-E) = 0 when Tp=Te=SST 90 !! - salinity : evaporation, precipitation and runoff 91 !! water has a zero salinity but there is a salt flux due to 92 !! freezing/melting, thus: 93 !! sa = sa + emp * sn / rau0 / e3t for k=1 94 !! + sfx / rau0 / e3t 95 !! where emp, the surface freshwater budget (evaporation minus 96 !! precipitation minus runoff) given in kg/m2/s is divided 97 !! by rau0 (density of sea water) to obtain m/s. 98 !! Note: even though Fwe does not appear explicitly for 99 !! temperature in this routine, the heat carried by the water 100 !! exchanged through the surface is part of the total heat flux 101 !! forcing and must be taken into account in the global heat 102 !! balance). 103 !! * nonlinear free surface (variable volume, lk_vvl) 104 !! contrary to the linear free surface case, Fwi is properly 105 !! taken into account by using the true layer thicknesses to 106 !! calculate tracer content and advection. There is no need to 107 !! deal with it in this routine. 108 !! - temperature: Fwe=SST (P-E+R) is added to Fext. 109 !! - salinity: Fwe = 0, there is no surface flux of salt. 110 !! 111 !! ** Action : - Update the 1st level of (ta,sa) with the trend associated 112 !! with the tracer surface boundary condition 113 !! - send trends to trdtra module (l_trdtra=T) 69 !! ** Action : - Update tsa with the surface boundary condition trend 70 !! - send trends to trdtra module for further diagnostics(l_trdtra=T) 114 71 !!---------------------------------------------------------------------- 115 72 INTEGER, INTENT(in) :: kt ! ocean time-step index 116 !! 117 INTEGER :: ji, jj, jk, jn ! dummy loop indices 118 INTEGER :: ikt, ikb 119 INTEGER :: nk_isf 120 REAL(wp) :: zfact, z1_e3t, zdep 121 REAL(wp) :: zalpha, zhk 73 ! 74 INTEGER :: ji, jj, jk, jn ! dummy loop indices 75 INTEGER :: ikt, ikb ! local integers 76 REAL(wp) :: zfact, z1_e3t, zdep ! local scalar 122 77 REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdt, ztrds 123 78 !!---------------------------------------------------------------------- … … 130 85 IF(lwp) WRITE(numout,*) '~~~~~~~ ' 131 86 ENDIF 132 87 ! 133 88 IF( l_trdtra ) THEN !* Save ta and sa trends 134 89 CALL wrk_alloc( jpi, jpj, jpk, ztrdt, ztrds ) … … 136 91 ztrds(:,:,:) = tsa(:,:,:,jp_sal) 137 92 ENDIF 138 139 !!gm IF( .NOT.ln_traqsr ) qsr(:,:) = 0.e0 ! no solar radiation penetration93 ! 94 !!gm This should be moved into sbcmod.F90 module ? (especially now that ln_traqsr is read in namsbc namelist) 140 95 IF( .NOT.ln_traqsr ) THEN ! no solar radiation penetration 141 96 qns(:,:) = qns(:,:) + qsr(:,:) ! total heat flux in qns 142 qsr(:,:) = 0. e0! qsr set to zero97 qsr(:,:) = 0._wp ! qsr set to zero 143 98 ENDIF 144 99 … … 146 101 ! EMP, SFX and QNS effects 147 102 !---------------------------------------- 148 ! Set before sbc tracer content fields 149 ! ************************************ 150 IF( kt == nit000 ) THEN ! Set the forcing field at nit000 - 1 151 ! ! ----------------------------------- 152 IF( ln_rstart .AND. & ! Restart: read in restart file 103 ! !== Set before sbc tracer content fields ==! 104 IF( kt == nit000 ) THEN !* 1st time-step 105 IF( ln_rstart .AND. & ! Restart: read in restart file 153 106 & iom_varid( numror, 'sbc_hc_b', ldstop = .FALSE. ) > 0 ) THEN 154 IF(lwp) WRITE(numout,*) ' nit000-1 s urface tracer content forcing fields red in the restart file'107 IF(lwp) WRITE(numout,*) ' nit000-1 sbc tracer content field read in the restart file' 155 108 zfact = 0.5_wp 156 109 CALL iom_get( numror, jpdom_autoglo, 'sbc_hc_b', sbc_tsc_b(:,:,jp_tem) ) ! before heat content sbc trend 157 110 CALL iom_get( numror, jpdom_autoglo, 'sbc_sc_b', sbc_tsc_b(:,:,jp_sal) ) ! before salt content sbc trend 158 ELSE 111 ELSE ! No restart or restart not found: Euler forward time stepping 159 112 zfact = 1._wp 113 sbc_tsc(:,:,:) = 0._wp 160 114 sbc_tsc_b(:,:,:) = 0._wp 161 115 ENDIF 162 ELSE ! Swap of forcing fields 163 ! ! ---------------------- 116 ELSE !* other time-steps: swap of forcing fields 164 117 zfact = 0.5_wp 165 118 sbc_tsc_b(:,:,:) = sbc_tsc(:,:,:) 166 119 ENDIF 167 ! Compute now sbc tracer content fields 168 ! ************************************* 169 170 ! Concentration dilution effect on (t,s) due to 171 ! evaporation, precipitation and qns, but not river runoff 172 173 IF( lk_vvl ) THEN ! Variable Volume case ==>> heat content of mass flux is in qns 174 DO jj = 1, jpj 175 DO ji = 1, jpi 176 sbc_tsc(ji,jj,jp_tem) = r1_rau0_rcp * qns(ji,jj) ! non solar heat flux 177 sbc_tsc(ji,jj,jp_sal) = r1_rau0 * sfx(ji,jj) ! salt flux due to freezing/melting 120 ! !== Now sbc tracer content fields ==! 121 DO jj = 2, jpj 122 DO ji = fs_2, fs_jpim1 ! vector opt. 123 sbc_tsc(ji,jj,jp_tem) = r1_rau0_rcp * qns(ji,jj) ! non solar heat flux 124 sbc_tsc(ji,jj,jp_sal) = r1_rau0 * sfx(ji,jj) ! salt flux due to freezing/melting 125 END DO 126 END DO 127 IF( ln_linssh ) THEN !* linear free surface 128 DO jj = 2, jpj !==>> add concentration/dilution effect due to constant volume cell 129 DO ji = fs_2, fs_jpim1 ! vector opt. 130 sbc_tsc(ji,jj,jp_tem) = sbc_tsc(ji,jj,jp_tem) + r1_rau0 * emp(ji,jj) * tsn(ji,jj,1,jp_tem) 131 sbc_tsc(ji,jj,jp_sal) = sbc_tsc(ji,jj,jp_sal) + r1_rau0 * emp(ji,jj) * tsn(ji,jj,1,jp_sal) 178 132 END DO 179 END DO 180 ELSE ! Constant Volume case ==>> Concentration dilution effect 133 END DO !==>> output c./d. term 134 IF( iom_use('emp_x_sst') ) CALL iom_put( "emp_x_sst", emp (:,:) * tsn(:,:,1,jp_tem) ) 135 IF( iom_use('emp_x_sss') ) CALL iom_put( "emp_x_sss", emp (:,:) * tsn(:,:,1,jp_sal) ) 136 ENDIF 137 ! 138 DO jn = 1, jpts !== update tracer trend ==! 181 139 DO jj = 2, jpj 182 DO ji = fs_2, fs_jpim1 ! vector opt. 183 ! temperature : heat flux 184 sbc_tsc(ji,jj,jp_tem) = r1_rau0_rcp * qns(ji,jj) & ! non solar heat flux 185 & + r1_rau0 * emp(ji,jj) * tsn(ji,jj,1,jp_tem) ! concent./dilut. effect 186 ! salinity : salt flux + concent./dilut. effect (both in sfx) 187 sbc_tsc(ji,jj,jp_sal) = r1_rau0 * ( sfx(ji,jj) & ! salt flux (freezing/melting) 188 & + emp(ji,jj) * tsn(ji,jj,1,jp_sal) ) ! concent./dilut. effect 140 DO ji = fs_2, fs_jpim1 ! vector opt. 141 tsa(ji,jj,1,jn) = tsa(ji,jj,1,jn) + zfact * ( sbc_tsc_b(ji,jj,jn) + sbc_tsc(ji,jj,jn) ) / e3t_n(ji,jj,1) 189 142 END DO 190 143 END DO 191 IF( iom_use('emp_x_sst') ) CALL iom_put( "emp_x_sst", emp (:,:) * tsn(:,:,1,jp_tem) ) ! c/d term on sst192 IF( iom_use('emp_x_sss') ) CALL iom_put( "emp_x_sss", emp (:,:) * tsn(:,:,1,jp_sal) ) ! c/d term on sss193 ENDIF194 ! Concentration dilution effect on (t,s) due to evapouration, precipitation and qns, but not river runoff195 DO jn = 1, jpts196 DO jj = 2, jpj197 DO ji = fs_2, fs_jpim1 ! vector opt.198 z1_e3t = zfact / fse3t(ji,jj,1)199 tsa(ji,jj,1,jn) = tsa(ji,jj,1,jn) + ( sbc_tsc_b(ji,jj,jn) + sbc_tsc(ji,jj,jn) ) * z1_e3t200 END DO201 END DO202 144 END DO 203 ! Write in the ocean restart file 204 ! ******************************* 205 IF( lrst_oce ) THEN 206 IF(lwp) WRITE(numout,*) 207 IF(lwp) WRITE(numout,*) 'sbc : ocean surface tracer content forcing fields written in ocean restart file ', & 208 & 'at it= ', kt,' date= ', ndastp 209 IF(lwp) WRITE(numout,*) '~~~~' 145 ! 146 IF( lrst_oce ) THEN !== write sbc_tsc in the ocean restart file ==! 210 147 CALL iom_rstput( kt, nitrst, numrow, 'sbc_hc_b', sbc_tsc(:,:,jp_tem) ) 211 148 CALL iom_rstput( kt, nitrst, numrow, 'sbc_sc_b', sbc_tsc(:,:,jp_sal) ) 212 149 ENDIF 213 150 ! 214 !215 151 !---------------------------------------- 216 152 ! Ice Shelf effects (ISF) … … 218 154 !---------------------------------------- 219 155 ! 220 IF( nn_isf > 0 ) THEN 221 zfact = 0.5e0 156 !!gm BUG ? Why no differences between non-linear and linear free surface ? 157 !!gm probably taken into account in r1_hisf_tbl : to be verified 158 IF( ln_isf ) THEN 159 zfact = 0.5_wp 222 160 DO jj = 2, jpj 223 161 DO ji = fs_2, fs_jpim1 224 162 ! 225 163 ikt = misfkt(ji,jj) 226 164 ikb = misfkb(ji,jj) 227 165 ! 228 166 ! level fully include in the ice shelf boundary layer 229 ! if isfdiv, we have to remove heat flux due to inflow at 0oC (as in rnf when you add rnf at sst)230 167 ! sign - because fwf sign of evapo (rnf sign of precip) 231 168 DO jk = ikt, ikb - 1 232 ! compute tfreez for the temperature correction (we add water at freezing temperature)233 169 ! compute trend 234 tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & 235 & + zfact * (risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem)) * r1_hisf_tbl(ji,jj) 236 tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) & 237 & + zfact * (risf_tsc_b(ji,jj,jp_sal) + risf_tsc(ji,jj,jp_sal)) * r1_hisf_tbl(ji,jj) 170 tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & 171 & + zfact * ( risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem) ) & 172 & * r1_hisf_tbl(ji,jj) 238 173 END DO 239 174 240 175 ! level partially include in ice shelf boundary layer 241 ! compute tfreez for the temperature correction (we add water at freezing temperature)242 176 ! compute trend 243 tsa(ji,jj,ikb,jp_tem) = tsa(ji,jj,ikb,jp_tem) &244 & + zfact * ( risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem)) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj)245 tsa(ji,jj,ikb,jp_sal) = tsa(ji,jj,ikb,jp_sal) &246 & + zfact * (risf_tsc_b(ji,jj,jp_sal) + risf_tsc(ji,jj,jp_sal)) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) 177 tsa(ji,jj,ikb,jp_tem) = tsa(ji,jj,ikb,jp_tem) & 178 & + zfact * ( risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem) ) & 179 & * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) 180 247 181 END DO 248 182 END DO 249 183 IF( lrst_oce ) THEN 250 IF(lwp) WRITE(numout,*) 251 IF(lwp) WRITE(numout,*) 'sbc : isf surface tracer content forcing fields written in ocean restart file ', & 252 & 'at it= ', kt,' date= ', ndastp 253 IF(lwp) WRITE(numout,*) '~~~~' 254 CALL iom_rstput( kt, nitrst, numrow, 'fwf_isf_b', fwfisf(:,:) ) 184 CALL iom_rstput( kt, nitrst, numrow, 'fwf_isf_b', fwfisf (:,:) ) 255 185 CALL iom_rstput( kt, nitrst, numrow, 'isf_hc_b' , risf_tsc(:,:,jp_tem) ) 256 186 CALL iom_rstput( kt, nitrst, numrow, 'isf_sc_b' , risf_tsc(:,:,jp_sal) ) … … 269 199 zdep = zfact / h_rnf(ji,jj) 270 200 DO jk = 1, nk_rnf(ji,jj) 271 tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) &272 &+ ( rnf_tsc_b(ji,jj,jp_tem) + rnf_tsc(ji,jj,jp_tem) ) * zdep273 IF( ln_rnf_sal ) tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) &274 &+ ( rnf_tsc_b(ji,jj,jp_sal) + rnf_tsc(ji,jj,jp_sal) ) * zdep201 tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & 202 & + ( rnf_tsc_b(ji,jj,jp_tem) + rnf_tsc(ji,jj,jp_tem) ) * zdep 203 IF( ln_rnf_sal ) tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) & 204 & + ( rnf_tsc_b(ji,jj,jp_sal) + rnf_tsc(ji,jj,jp_sal) ) * zdep 275 205 END DO 276 206 ENDIF … … 278 208 END DO 279 209 ENDIF 280 281 IF( l_trdtra ) THEN ! send trends for further diagnostics 210 211 IF( iom_use('rnf_x_sst') ) CALL iom_put( "rnf_x_sst", rnf*tsn(:,:,1,jp_tem) ) ! runoff term on sst 212 IF( iom_use('rnf_x_sss') ) CALL iom_put( "rnf_x_sss", rnf*tsn(:,:,1,jp_sal) ) ! runoff term on sss 213 214 ! 215 !---------------------------------------- 216 ! Ice Sheet coupling imbalance correction to have conservation 217 !---------------------------------------- 218 ! 219 IF( ln_iscpl .AND. ln_hsb) THEN ! input of heat and salt due to river runoff 220 DO jk = 1,jpk 221 DO jj = 2, jpj 222 DO ji = fs_2, fs_jpim1 223 zdep = 1._wp / e3t_n(ji,jj,jk) 224 tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) - htsc_iscpl(ji,jj,jk,jp_tem) & 225 & * zdep 226 tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) - htsc_iscpl(ji,jj,jk,jp_sal) & 227 & * zdep 228 END DO 229 END DO 230 END DO 231 ENDIF 232 233 IF( l_trdtra ) THEN ! save the horizontal diffusive trends for further diagnostics 282 234 ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) 283 235 ztrds(:,:,:) = tsa(:,:,:,jp_sal) - ztrds(:,:,:)
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