- Timestamp:
- 2016-04-21T18:15:17+02:00 (8 years ago)
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branches/UKMO/dev_r5518_GO6_package/NEMOGCM/NEMO/OPA_SRC/ZDF/zdfmxl.F90
r6487 r6491 18 18 USE phycst ! physical constants 19 19 USE iom ! I/O library 20 USE eosbn2 ! for zdf_mxl_zint 20 21 USE lib_mpp ! MPP library 21 22 USE wrk_nemo ! work arrays … … 33 34 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] 34 35 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: mixed layer depth at t-points [m] 36 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld_zint !: vertically-interpolated mixed layer depth [m] 37 LOGICAL, PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: ll_found ! Is T_b to be found by interpolation ? 38 LOGICAL, PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: ll_belowml ! Flag points below mixed layer when ll_found=F 35 39 36 40 REAL(wp), PUBLIC :: rho_c = 0.01_wp !: density criterion for mixed layer depth 37 41 REAL(wp) :: avt_c = 5.e-4_wp ! Kz criterion for the turbocline depth 42 43 ! Namelist variables for namzdf_mldzint 44 INTEGER :: nn_mld_type ! mixed layer type 45 REAL(wp) :: rn_zref ! depth of initial T_ref 46 REAL(wp) :: rn_dT_crit ! Critical temp diff 47 REAL(wp) :: rn_iso_frac ! Fraction of rn_dT_crit used 38 48 39 49 !! * Substitutions … … 52 62 zdf_mxl_alloc = 0 ! set to zero if no array to be allocated 53 63 IF( .NOT. ALLOCATED( nmln ) ) THEN 54 ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), STAT= zdf_mxl_alloc ) 64 ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), hmld_zint(jpi,jpj), & 65 & ll_found(jpi,jpj), ll_belowml(jpi,jpj,jpk), STAT= zdf_mxl_alloc ) 55 66 ! 56 67 IF( lk_mpp ) CALL mpp_sum ( zdf_mxl_alloc ) … … 90 101 CALL wrk_alloc( jpi,jpj, imld ) 91 102 92 IF( kt == nit000 ) THEN103 IF( kt <= nit000 ) THEN 93 104 IF(lwp) WRITE(numout,*) 94 105 IF(lwp) WRITE(numout,*) 'zdf_mxl : mixed layer depth' … … 134 145 END DO 135 146 IF( .NOT.lk_offline ) THEN ! no need to output in offline mode 147 IF( kt >= nit000 ) THEN ! workaround for calls before SOMETHING reads the XIOS namelist 136 148 CALL iom_put( "mldr10_1", hmlp ) ! mixed layer depth 137 149 CALL iom_put( "mldkz5" , hmld ) ! turbocline depth 138 150 ENDIF 151 ENDIF 139 152 153 ! Vertically-interpolated mixed-layer depth diagnostic 154 IF( iom_use( "mldzint" ) ) THEN 155 CALL zdf_mxl_zint( kt ) 156 CALL iom_put( "mldzint" , hmld_zint ) 157 ENDIF 158 140 159 IF(ln_ctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ', ovlap=1 ) 141 160 ! … … 145 164 ! 146 165 END SUBROUTINE zdf_mxl 166 167 SUBROUTINE zdf_mxl_zint( kt ) 168 !!---------------------------------------------------------------------------------- 169 !! *** ROUTINE zdf_mxl_zint *** 170 ! 171 ! Calculate vertically-interpolated mixed layer depth diagnostic. 172 ! 173 ! This routine can calculate the mixed layer depth diagnostic suggested by 174 ! Kara et al, 2000, JGR, 105, 16803, but is more general and can calculate 175 ! vertically-interpolated mixed-layer depth diagnostics with other parameter 176 ! settings set in the namzdf_mldzint namelist. 177 ! 178 ! If mld_type=1 the mixed layer depth is calculated as the depth at which the 179 ! density has increased by an amount equivalent to a temperature difference of 180 ! 0.8C at the surface. 181 ! 182 ! For other values of mld_type the mixed layer is calculated as the depth at 183 ! which the temperature differs by 0.8C from the surface temperature. 184 ! 185 ! David Acreman, Daley Calvert 186 ! 187 !!----------------------------------------------------------------------------------- 188 189 INTEGER, INTENT(in) :: kt ! ocean time-step index 190 ! 191 ! Local variables 192 INTEGER, POINTER, DIMENSION(:,:) :: ikmt ! number of active tracer levels 193 INTEGER, POINTER, DIMENSION(:,:) :: ik_ref ! index of reference level 194 INTEGER, POINTER, DIMENSION(:,:) :: ik_iso ! index of last uniform temp level 195 REAL, POINTER, DIMENSION(:,:,:) :: zT ! Temperature or density 196 REAL, POINTER, DIMENSION(:,:) :: ppzdep ! depth for use in calculating d(rho) 197 REAL, POINTER, DIMENSION(:,:) :: zT_ref ! reference temperature 198 REAL :: zT_b ! base temperature 199 REAL, POINTER, DIMENSION(:,:,:) :: zdTdz ! gradient of zT 200 REAL, POINTER, DIMENSION(:,:,:) :: zmoddT ! Absolute temperature difference 201 REAL :: zdz ! depth difference 202 REAL :: zdT ! temperature difference 203 REAL, POINTER, DIMENSION(:,:) :: zdelta_T ! difference critereon 204 REAL, POINTER, DIMENSION(:,:) :: zRHO1, zRHO2 ! Densities 205 INTEGER :: ji, jj, jk ! loop counter 206 INTEGER :: ios 207 208 NAMELIST/namzdf_mldzint/ nn_mld_type, rn_zref, rn_dT_crit, rn_iso_frac 209 210 !!------------------------------------------------------------------------------------- 211 ! 212 CALL wrk_alloc( jpi, jpj, ikmt, ik_ref, ik_iso) 213 CALL wrk_alloc( jpi, jpj, ppzdep, zT_ref, zdelta_T, zRHO1, zRHO2 ) 214 CALL wrk_alloc( jpi, jpj, jpk, zT, zdTdz, zmoddT ) 215 216 IF( kt == nit000 ) THEN 217 REWIND( numnam_ref ) ! Namelist namzdf_mldzint in reference namelist 218 READ ( numnam_ref, namzdf_mldzint, IOSTAT = ios, ERR = 901) 219 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_mldzint in reference namelist', lwp ) 220 221 REWIND( numnam_cfg ) ! Namelist namzdf_mldzint in configuration namelist 222 READ ( numnam_cfg, namzdf_mldzint, IOSTAT = ios, ERR = 902 ) 223 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_mldzint in configuration namelist', lwp ) 224 IF(lwm) WRITE ( numond, namzdf_mldzint ) 225 226 WRITE(numout,*) '===== Vertically-interpolated mixed layer =====' 227 WRITE(numout,*) 'nn_mld_type = ',nn_mld_type 228 WRITE(numout,*) 'rn_zref = ',rn_zref 229 WRITE(numout,*) 'rn_dT_crit = ',rn_dT_crit 230 WRITE(numout,*) 'rn_iso_frac = ',rn_iso_frac 231 WRITE(numout,*) '===============================================' 232 ENDIF 233 234 ! Set the mixed layer depth criterion at each grid point 235 IF (nn_mld_type == 1) THEN 236 ppzdep(:,:)=0.0 237 call eos ( tsn(:,:,1,:), ppzdep(:,:), zRHO1(:,:) ) 238 ! Use zT temporarily as a copy of tsn with rn_dT_crit added to SST 239 ! [assumes number of tracers less than number of vertical levels] 240 zT(:,:,1:jpts)=tsn(:,:,1,1:jpts) 241 zT(:,:,jp_tem)=zT(:,:,1)+rn_dT_crit 242 CALL eos( zT(:,:,1:jpts), ppzdep(:,:), zRHO2(:,:) ) 243 zdelta_T(:,:) = abs( zRHO1(:,:) - zRHO2(:,:) ) * rau0 244 ! RHO from eos (2d version) doesn't calculate north or east halo: 245 CALL lbc_lnk( zdelta_T, 'T', 1. ) 246 zT(:,:,:) = rhop(:,:,:) 247 ELSE 248 zdelta_T(:,:) = rn_dT_crit 249 zT(:,:,:) = tsn(:,:,:,jp_tem) 250 END IF 251 252 ! Calculate the gradient of zT and absolute difference for use later 253 DO jk = 1 ,jpk-2 254 zdTdz(:,:,jk) = ( zT(:,:,jk+1) - zT(:,:,jk) ) / fse3w(:,:,jk+1) 255 zmoddT(:,:,jk) = abs( zT(:,:,jk+1) - zT(:,:,jk) ) 256 END DO 257 258 ! Find density/temperature at the reference level (Kara et al use 10m). 259 ! ik_ref is the index of the box centre immediately above or at the reference level 260 ! Find rn_zref in the array of model level depths and find the ref 261 ! density/temperature by linear interpolation. 262 DO jk = jpkm1, 2, -1 263 WHERE ( fsdept(:,:,jk) > rn_zref ) 264 ik_ref(:,:) = jk - 1 265 zT_ref(:,:) = zT(:,:,jk-1) + zdTdz(:,:,jk-1) * ( rn_zref - fsdept(:,:,jk-1) ) 266 END WHERE 267 END DO 268 269 ! If the first grid box centre is below the reference level then use the 270 ! top model level to get zT_ref 271 WHERE ( fsdept(:,:,1) > rn_zref ) 272 zT_ref = zT(:,:,1) 273 ik_ref = 1 274 END WHERE 275 276 ! The number of active tracer levels is 1 less than the number of active w levels 277 ikmt(:,:) = mbathy(:,:) - 1 278 279 ! Search for a uniform density/temperature region where adjacent levels 280 ! differ by less than rn_iso_frac * deltaT. 281 ! ik_iso is the index of the last level in the uniform layer 282 ! ll_found indicates whether the mixed layer depth can be found by interpolation 283 ik_iso(:,:) = ik_ref(:,:) 284 ll_found(:,:) = .false. 285 DO jj = 1, nlcj 286 DO ji = 1, nlci 287 !CDIR NOVECTOR 288 DO jk = ik_ref(ji,jj), ikmt(ji,jj)-1 289 IF ( zmoddT(ji,jj,jk) > ( rn_iso_frac * zdelta_T(ji,jj) ) ) THEN 290 ik_iso(ji,jj) = jk 291 ll_found(ji,jj) = ( zmoddT(ji,jj,jk) > zdelta_T(ji,jj) ) 292 EXIT 293 END IF 294 END DO 295 END DO 296 END DO 297 298 ! Use linear interpolation to find depth of mixed layer base where possible 299 hmld_zint(:,:) = rn_zref 300 DO jj = 1, jpj 301 DO ji = 1, jpi 302 IF (ll_found(ji,jj) .and. tmask(ji,jj,1) == 1.0) THEN 303 zdz = abs( zdelta_T(ji,jj) / zdTdz(ji,jj,ik_iso(ji,jj)) ) 304 hmld_zint(ji,jj) = fsdept(ji,jj,ik_iso(ji,jj)) + zdz 305 END IF 306 END DO 307 END DO 308 309 ! If ll_found = .false. then calculate MLD using difference of zdelta_T 310 ! from the reference density/temperature 311 312 ! Prevent this section from working on land points 313 WHERE ( tmask(:,:,1) /= 1.0 ) 314 ll_found = .true. 315 END WHERE 316 317 DO jk=1, jpk 318 ll_belowml(:,:,jk) = abs( zT(:,:,jk) - zT_ref(:,:) ) >= zdelta_T(:,:) 319 END DO 320 321 ! Set default value where interpolation cannot be used (ll_found=false) 322 DO jj = 1, jpj 323 DO ji = 1, jpi 324 IF ( .not. ll_found(ji,jj) ) hmld_zint(ji,jj) = fsdept(ji,jj,ikmt(ji,jj)) 325 END DO 326 END DO 327 328 DO jj = 1, jpj 329 DO ji = 1, jpi 330 !CDIR NOVECTOR 331 DO jk = ik_ref(ji,jj)+1, ikmt(ji,jj) 332 IF ( ll_found(ji,jj) ) EXIT 333 IF ( ll_belowml(ji,jj,jk) ) THEN 334 zT_b = zT_ref(ji,jj) + zdelta_T(ji,jj) * SIGN(1.0, zdTdz(ji,jj,jk-1) ) 335 zdT = zT_b - zT(ji,jj,jk-1) 336 zdz = zdT / zdTdz(ji,jj,jk-1) 337 hmld_zint(ji,jj) = fsdept(ji,jj,jk-1) + zdz 338 EXIT 339 END IF 340 END DO 341 END DO 342 END DO 343 344 hmld_zint(:,:) = hmld_zint(:,:)*tmask(:,:,1) 345 ! 346 CALL wrk_dealloc( jpi, jpj, ikmt, ik_ref, ik_iso) 347 CALL wrk_dealloc( jpi, jpj, ppzdep, zT_ref, zdelta_T, zRHO1, zRHO2 ) 348 CALL wrk_dealloc( jpi,jpj, jpk, zT, zdTdz, zmoddT ) 349 ! 350 END SUBROUTINE zdf_mxl_zint 147 351 148 352 !!======================================================================
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