Changeset 9497 for branches/UKMO/dev_merge_2017_restart_datestamp_GO6_mixing/NEMOGCM/NEMO/OPA_SRC/ZDF/zdfmxl.F90
- Timestamp:
- 2018-04-23T16:37:47+02:00 (6 years ago)
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branches/UKMO/dev_merge_2017_restart_datestamp_GO6_mixing/NEMOGCM/NEMO/OPA_SRC/ZDF/zdfmxl.F90
r9496 r9497 15 15 USE trc_oce , ONLY: l_offline ! ocean space and time domain variables 16 16 USE zdf_oce ! ocean vertical physics 17 USE eosbn2 ! for zdf_mxl_zint 17 18 ! 18 19 USE in_out_manager ! I/O manager … … 31 32 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] (used by LDF) 32 33 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: depth of the last T-point inside the mixed layer [m] (used by LDF) 34 REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: hmld_zint !: vertically-interpolated mixed layer depth [m] 35 REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: htc_mld ! Heat content of hmld_zint 36 LOGICAL, PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: ll_found ! Is T_b to be found by interpolation ? 37 LOGICAL, PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: ll_belowml ! Flag points below mixed layer when ll_found=F 33 38 34 39 REAL(wp), PUBLIC :: rho_c = 0.01_wp !: density criterion for mixed layer depth 35 40 REAL(wp) :: avt_c = 5.e-4_wp ! Kz criterion for the turbocline depth 41 42 TYPE, PUBLIC :: MXL_ZINT !: Structure for MLD defs 43 INTEGER :: mld_type ! mixed layer type 44 REAL(wp) :: zref ! depth of initial T_ref 45 REAL(wp) :: dT_crit ! Critical temp diff 46 REAL(wp) :: iso_frac ! Fraction of rn_dT_crit used 47 END TYPE MXL_ZINT 36 48 37 49 !!---------------------------------------------------------------------- … … 48 60 zdf_mxl_alloc = 0 ! set to zero if no array to be allocated 49 61 IF( .NOT. ALLOCATED( nmln ) ) THEN 50 ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), STAT= zdf_mxl_alloc ) 62 ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), hmld_zint(jpi,jpj), & 63 & htc_mld(jpi,jpj), & 64 & ll_found(jpi,jpj), ll_belowml(jpi,jpj,jpk), STAT= zdf_mxl_alloc ) 51 65 ! 52 66 IF( lk_mpp ) CALL mpp_sum ( zdf_mxl_alloc ) … … 137 151 ENDIF 138 152 ! 153 ! Vertically-interpolated mixed-layer depth diagnostic 154 CALL zdf_mxl_zint( kt ) 155 ! 139 156 IF(ln_ctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ' ) 140 157 ! 141 158 END SUBROUTINE zdf_mxl 159 160 SUBROUTINE zdf_mxl_zint_mld( sf ) 161 !!---------------------------------------------------------------------------------- 162 !! *** ROUTINE zdf_mxl_zint_mld *** 163 ! 164 ! Calculate vertically-interpolated mixed layer depth diagnostic. 165 ! 166 ! This routine can calculate the mixed layer depth diagnostic suggested by 167 ! Kara et al, 2000, JGR, 105, 16803, but is more general and can calculate 168 ! vertically-interpolated mixed-layer depth diagnostics with other parameter 169 ! settings set in the namzdf_mldzint namelist. 170 ! 171 ! If mld_type=1 the mixed layer depth is calculated as the depth at which the 172 ! density has increased by an amount equivalent to a temperature difference of 173 ! 0.8C at the surface. 174 ! 175 ! For other values of mld_type the mixed layer is calculated as the depth at 176 ! which the temperature differs by 0.8C from the surface temperature. 177 ! 178 ! David Acreman, Daley Calvert 179 ! 180 !!----------------------------------------------------------------------------------- 181 182 TYPE(MXL_ZINT), INTENT(in) :: sf 183 184 ! Diagnostic criteria 185 INTEGER :: nn_mld_type ! mixed layer type 186 REAL(wp) :: rn_zref ! depth of initial T_ref 187 REAL(wp) :: rn_dT_crit ! Critical temp diff 188 REAL(wp) :: rn_iso_frac ! Fraction of rn_dT_crit used 189 190 ! Local variables 191 REAL(wp), PARAMETER :: zepsilon = 1.e-30 ! local small value 192 INTEGER, DIMENSION(jpi,jpj) :: ikmt ! number of active tracer levels 193 INTEGER, DIMENSION(jpi,jpj) :: ik_ref ! index of reference level 194 INTEGER, DIMENSION(jpi,jpj) :: ik_iso ! index of last uniform temp level 195 REAL, DIMENSION(jpi,jpj,jpk) :: zT ! Temperature or density 196 REAL, DIMENSION(jpi,jpj) :: ppzdep ! depth for use in calculating d(rho) 197 REAL, DIMENSION(jpi,jpj) :: zT_ref ! reference temperature 198 REAL :: zT_b ! base temperature 199 REAL, DIMENSION(jpi,jpj,jpk) :: zdTdz ! gradient of zT 200 REAL, DIMENSION(jpi,jpj,jpk) :: zmoddT ! Absolute temperature difference 201 REAL :: zdz ! depth difference 202 REAL :: zdT ! temperature difference 203 REAL, DIMENSION(jpi,jpj) :: zdelta_T ! difference critereon 204 REAL, DIMENSION(jpi,jpj) :: zRHO1, zRHO2 ! Densities 205 INTEGER :: ji, jj, jk ! loop counter 206 207 !!------------------------------------------------------------------------------------- 208 ! 209 ! Unpack structure 210 nn_mld_type = sf%mld_type 211 rn_zref = sf%zref 212 rn_dT_crit = sf%dT_crit 213 rn_iso_frac = sf%iso_frac 214 215 ! Set the mixed layer depth criterion at each grid point 216 IF( nn_mld_type == 0 ) THEN 217 zdelta_T(:,:) = rn_dT_crit 218 zT(:,:,:) = rhop(:,:,:) 219 ELSE IF( nn_mld_type == 1 ) THEN 220 ppzdep(:,:)=0.0 221 call eos ( tsn(:,:,1,:), ppzdep(:,:), zRHO1(:,:) ) 222 ! Use zT temporarily as a copy of tsn with rn_dT_crit added to SST 223 ! [assumes number of tracers less than number of vertical levels] 224 zT(:,:,1:jpts)=tsn(:,:,1,1:jpts) 225 zT(:,:,jp_tem)=zT(:,:,1)+rn_dT_crit 226 CALL eos( zT(:,:,1:jpts), ppzdep(:,:), zRHO2(:,:) ) 227 zdelta_T(:,:) = abs( zRHO1(:,:) - zRHO2(:,:) ) * rau0 228 ! RHO from eos (2d version) doesn't calculate north or east halo: 229 CALL lbc_lnk( zdelta_T, 'T', 1. ) 230 zT(:,:,:) = rhop(:,:,:) 231 ELSE 232 zdelta_T(:,:) = rn_dT_crit 233 zT(:,:,:) = tsn(:,:,:,jp_tem) 234 END IF 235 236 ! Calculate the gradient of zT and absolute difference for use later 237 DO jk = 1 ,jpk-2 238 zdTdz(:,:,jk) = ( zT(:,:,jk+1) - zT(:,:,jk) ) / e3w_n(:,:,jk+1) 239 zmoddT(:,:,jk) = abs( zT(:,:,jk+1) - zT(:,:,jk) ) 240 END DO 241 242 ! Find density/temperature at the reference level (Kara et al use 10m). 243 ! ik_ref is the index of the box centre immediately above or at the reference level 244 ! Find rn_zref in the array of model level depths and find the ref 245 ! density/temperature by linear interpolation. 246 DO jk = jpkm1, 2, -1 247 WHERE ( gdept_n(:,:,jk) > rn_zref ) 248 ik_ref(:,:) = jk - 1 249 zT_ref(:,:) = zT(:,:,jk-1) + zdTdz(:,:,jk-1) * ( rn_zref - gdept_n(:,:,jk-1) ) 250 END WHERE 251 END DO 252 253 ! If the first grid box centre is below the reference level then use the 254 ! top model level to get zT_ref 255 WHERE ( gdept_n(:,:,1) > rn_zref ) 256 zT_ref = zT(:,:,1) 257 ik_ref = 1 258 END WHERE 259 260 ! The number of active tracer levels is 1 less than the number of active w levels 261 ikmt(:,:) = mbkt(:,:) - 1 262 263 ! Initialize / reset 264 ll_found(:,:) = .false. 265 266 IF ( rn_iso_frac - zepsilon > 0. ) THEN 267 ! Search for a uniform density/temperature region where adjacent levels 268 ! differ by less than rn_iso_frac * deltaT. 269 ! ik_iso is the index of the last level in the uniform layer 270 ! ll_found indicates whether the mixed layer depth can be found by interpolation 271 ik_iso(:,:) = ik_ref(:,:) 272 DO jj = 1, nlcj 273 DO ji = 1, nlci 274 !CDIR NOVECTOR 275 DO jk = ik_ref(ji,jj), ikmt(ji,jj)-1 276 IF ( zmoddT(ji,jj,jk) > ( rn_iso_frac * zdelta_T(ji,jj) ) ) THEN 277 ik_iso(ji,jj) = jk 278 ll_found(ji,jj) = ( zmoddT(ji,jj,jk) > zdelta_T(ji,jj) ) 279 EXIT 280 END IF 281 END DO 282 END DO 283 END DO 284 285 ! Use linear interpolation to find depth of mixed layer base where possible 286 hmld_zint(:,:) = rn_zref 287 DO jj = 1, jpj 288 DO ji = 1, jpi 289 IF (ll_found(ji,jj) .and. tmask(ji,jj,1) == 1.0) THEN 290 zdz = abs( zdelta_T(ji,jj) / zdTdz(ji,jj,ik_iso(ji,jj)) ) 291 hmld_zint(ji,jj) = gdept_n(ji,jj,ik_iso(ji,jj)) + zdz 292 END IF 293 END DO 294 END DO 295 END IF 296 297 ! If ll_found = .false. then calculate MLD using difference of zdelta_T 298 ! from the reference density/temperature 299 300 ! Prevent this section from working on land points 301 WHERE ( tmask(:,:,1) /= 1.0 ) 302 ll_found = .true. 303 END WHERE 304 305 DO jk=1, jpk 306 ll_belowml(:,:,jk) = abs( zT(:,:,jk) - zT_ref(:,:) ) >= zdelta_T(:,:) 307 END DO 308 309 ! Set default value where interpolation cannot be used (ll_found=false) 310 DO jj = 1, jpj 311 DO ji = 1, jpi 312 IF ( .not. ll_found(ji,jj) ) hmld_zint(ji,jj) = gdept_n(ji,jj,ikmt(ji,jj)) 313 END DO 314 END DO 315 316 DO jj = 1, jpj 317 DO ji = 1, jpi 318 !CDIR NOVECTOR 319 DO jk = ik_ref(ji,jj)+1, ikmt(ji,jj) 320 IF ( ll_found(ji,jj) ) EXIT 321 IF ( ll_belowml(ji,jj,jk) ) THEN 322 zT_b = zT_ref(ji,jj) + zdelta_T(ji,jj) * SIGN(1.0, zdTdz(ji,jj,jk-1) ) 323 zdT = zT_b - zT(ji,jj,jk-1) 324 zdz = zdT / zdTdz(ji,jj,jk-1) 325 hmld_zint(ji,jj) = gdept_n(ji,jj,jk-1) + zdz 326 EXIT 327 END IF 328 END DO 329 END DO 330 END DO 331 332 hmld_zint(:,:) = hmld_zint(:,:)*tmask(:,:,1) 333 ! 334 END SUBROUTINE zdf_mxl_zint_mld 335 336 SUBROUTINE zdf_mxl_zint_htc( kt ) 337 !!---------------------------------------------------------------------- 338 !! *** ROUTINE zdf_mxl_zint_htc *** 339 !! 340 !! ** Purpose : 341 !! 342 !! ** Method : 343 !!---------------------------------------------------------------------- 344 345 INTEGER, INTENT(in) :: kt ! ocean time-step index 346 347 INTEGER :: ji, jj, jk 348 INTEGER :: ikmax 349 REAL(wp) :: zc, zcoef 350 ! 351 INTEGER, ALLOCATABLE, DIMENSION(:,:) :: ilevel 352 REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zthick_0, zthick 353 354 !!---------------------------------------------------------------------- 355 356 IF( .NOT. ALLOCATED(ilevel) ) THEN 357 ALLOCATE( ilevel(jpi,jpj), zthick_0(jpi,jpj), & 358 & zthick(jpi,jpj), STAT=ji ) 359 IF( lk_mpp ) CALL mpp_sum(ji) 360 IF( ji /= 0 ) CALL ctl_stop( 'STOP', 'zdf_mxl_zint_htc : unable to allocate arrays' ) 361 ENDIF 362 363 ! Find last whole model T level above the MLD 364 ilevel(:,:) = 0 365 zthick_0(:,:) = 0._wp 366 367 DO jk = 1, jpkm1 368 DO jj = 1, jpj 369 DO ji = 1, jpi 370 zthick_0(ji,jj) = zthick_0(ji,jj) + e3t_n(ji,jj,jk) 371 IF( zthick_0(ji,jj) < hmld_zint(ji,jj) ) ilevel(ji,jj) = jk 372 END DO 373 END DO 374 WRITE(numout,*) 'zthick_0(jk =',jk,') =',zthick_0(2,2) 375 WRITE(numout,*) 'gdepw_n(jk+1 =',jk+1,') =',gdepw_n(2,2,jk+1) 376 END DO 377 378 ! Surface boundary condition 379 IF( ln_linssh ) THEN ; zthick(:,:) = sshn(:,:) ; htc_mld(:,:) = tsn(:,:,1,jp_tem) * sshn(:,:) * tmask(:,:,1) 380 ELSE ; zthick(:,:) = 0._wp ; htc_mld(:,:) = 0._wp 381 ENDIF 382 383 ! Deepest whole T level above the MLD 384 ikmax = MIN( MAXVAL( ilevel(:,:) ), jpkm1 ) 385 386 ! Integration down to last whole model T level 387 DO jk = 1, ikmax 388 DO jj = 1, jpj 389 DO ji = 1, jpi 390 zc = e3t_n(ji,jj,jk) * REAL( MIN( MAX( 0, ilevel(ji,jj) - jk + 1 ) , 1 ) ) ! 0 below ilevel 391 zthick(ji,jj) = zthick(ji,jj) + zc 392 htc_mld(ji,jj) = htc_mld(ji,jj) + zc * tsn(ji,jj,jk,jp_tem) * tmask(ji,jj,jk) 393 END DO 394 END DO 395 END DO 396 397 ! Subsequent partial T level 398 zthick(:,:) = hmld_zint(:,:) - zthick(:,:) ! remaining thickness to reach MLD 399 400 DO jj = 1, jpj 401 DO ji = 1, jpi 402 htc_mld(ji,jj) = htc_mld(ji,jj) + tsn(ji,jj,ilevel(ji,jj)+1,jp_tem) & 403 & * MIN( e3t_n(ji,jj,ilevel(ji,jj)+1), zthick(ji,jj) ) * tmask(ji,jj,ilevel(ji,jj)+1) 404 END DO 405 END DO 406 407 WRITE(numout,*) 'htc_mld(after) =',htc_mld(2,2) 408 409 ! Convert to heat content 410 zcoef = rau0 * rcp 411 htc_mld(:,:) = zcoef * htc_mld(:,:) 412 413 END SUBROUTINE zdf_mxl_zint_htc 414 415 SUBROUTINE zdf_mxl_zint( kt ) 416 !!---------------------------------------------------------------------- 417 !! *** ROUTINE zdf_mxl_zint *** 418 !! 419 !! ** Purpose : 420 !! 421 !! ** Method : 422 !!---------------------------------------------------------------------- 423 424 INTEGER, INTENT(in) :: kt ! ocean time-step index 425 426 INTEGER :: ios 427 INTEGER :: jn 428 429 INTEGER :: nn_mld_diag = 0 ! number of diagnostics 430 431 CHARACTER(len=1) :: cmld 432 433 TYPE(MXL_ZINT) :: sn_mld1, sn_mld2, sn_mld3, sn_mld4, sn_mld5 434 TYPE(MXL_ZINT), SAVE, DIMENSION(5) :: mld_diags 435 436 NAMELIST/namzdf_mldzint/ nn_mld_diag, sn_mld1, sn_mld2, sn_mld3, sn_mld4, sn_mld5 437 438 !!---------------------------------------------------------------------- 439 440 IF( kt == nit000 ) THEN 441 REWIND( numnam_ref ) ! Namelist namzdf_mldzint in reference namelist 442 READ ( numnam_ref, namzdf_mldzint, IOSTAT = ios, ERR = 901) 443 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_mldzint in reference namelist', lwp ) 444 445 REWIND( numnam_cfg ) ! Namelist namzdf_mldzint in configuration namelist 446 READ ( numnam_cfg, namzdf_mldzint, IOSTAT = ios, ERR = 902 ) 447 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_mldzint in configuration namelist', lwp ) 448 IF(lwm) WRITE ( numond, namzdf_mldzint ) 449 450 IF( nn_mld_diag > 5 ) CALL ctl_stop( 'STOP', 'zdf_mxl_ini: Specify no more than 5 MLD definitions' ) 451 452 mld_diags(1) = sn_mld1 453 mld_diags(2) = sn_mld2 454 mld_diags(3) = sn_mld3 455 mld_diags(4) = sn_mld4 456 mld_diags(5) = sn_mld5 457 458 IF( lwp .AND. (nn_mld_diag > 0) ) THEN 459 WRITE(numout,*) '=============== Vertically-interpolated mixed layer ================' 460 WRITE(numout,*) '(Diagnostic number, nn_mld_type, rn_zref, rn_dT_crit, rn_iso_frac)' 461 DO jn = 1, nn_mld_diag 462 WRITE(numout,*) 'MLD criterion',jn,':' 463 WRITE(numout,*) ' nn_mld_type =', mld_diags(jn)%mld_type 464 WRITE(numout,*) ' rn_zref =' , mld_diags(jn)%zref 465 WRITE(numout,*) ' rn_dT_crit =' , mld_diags(jn)%dT_crit 466 WRITE(numout,*) ' rn_iso_frac =', mld_diags(jn)%iso_frac 467 END DO 468 WRITE(numout,*) '====================================================================' 469 ENDIF 470 ENDIF 471 472 IF( nn_mld_diag > 0 ) THEN 473 DO jn = 1, nn_mld_diag 474 WRITE(cmld,'(I1)') jn 475 IF( iom_use( "mldzint_"//cmld ) .OR. iom_use( "mldhtc_"//cmld ) ) THEN 476 CALL zdf_mxl_zint_mld( mld_diags(jn) ) 477 478 IF( iom_use( "mldzint_"//cmld ) ) THEN 479 CALL iom_put( "mldzint_"//cmld, hmld_zint(:,:) ) 480 ENDIF 481 482 IF( iom_use( "mldhtc_"//cmld ) ) THEN 483 CALL zdf_mxl_zint_htc( kt ) 484 CALL iom_put( "mldhtc_"//cmld , htc_mld(:,:) ) 485 ENDIF 486 ENDIF 487 END DO 488 ENDIF 489 490 END SUBROUTINE zdf_mxl_zint 142 491 143 492 !!======================================================================
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