- Timestamp:
- 2015-04-30T15:21:55+02:00 (9 years ago)
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branches/UKMO/dev_r5107_mld_zint/NEMOGCM/NEMO/OPA_SRC/ZDF/zdfmxl.F90
r5247 r5249 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 … … 32 33 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] 33 34 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: mixed layer depth at t-points [m] 35 REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld_zint !: vertically-interpolated mixed layer depth [m] 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 34 38 35 39 REAL(wp), PUBLIC :: rho_c = 0.01_wp !: density criterion for mixed layer depth 36 40 REAL(wp) :: avt_c = 5.e-4_wp ! Kz criterion for the turbocline depth 41 42 ! Namelist variables for namzdf_mldzint 43 INTEGER :: nn_mld_type ! mixed layer type 44 REAL(wp) :: rn_zref ! depth of initial T_ref 45 REAL(wp) :: rn_dT_crit ! Critical temp diff 46 REAL(wp) :: rn_iso_frac ! Fraction of rn_dT_crit used 37 47 38 48 !! * Substitutions … … 51 61 zdf_mxl_alloc = 0 ! set to zero if no array to be allocated 52 62 IF( .NOT. ALLOCATED( nmln ) ) THEN 53 ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), STAT= zdf_mxl_alloc ) 63 ALLOCATE( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), hmld_zint(jpi,jpj), & 64 & ll_found(jpi,jpj), ll_belowml(jpi,jpj,jpk), STAT= zdf_mxl_alloc ) 54 65 ! 55 66 IF( lk_mpp ) CALL mpp_sum ( zdf_mxl_alloc ) … … 137 148 ENDIF 138 149 150 ! Vertically-interpolated mixed-layer depth diagnostic 151 IF( iom_use( "mldzint" ) ) THEN 152 CALL zdf_mxl_zint( kt ) 153 CALL iom_put( "mldzint" , hmld_zint ) 154 ENDIF 155 139 156 IF(ln_ctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ', ovlap=1 ) 140 157 ! … … 144 161 ! 145 162 END SUBROUTINE zdf_mxl 163 164 SUBROUTINE zdf_mxl_zint( kt ) 165 !!---------------------------------------------------------------------------------- 166 !! *** ROUTINE zdf_mxl_zint *** 167 ! 168 ! Calculate vertically-interpolated mixed layer depth diagnostic. 169 ! 170 ! This routine can calculate the mixed layer depth diagnostic suggested by 171 ! Kara et al, 2000, JGR, 105, 16803, but is more general and can calculate 172 ! vertically-interpolated mixed-layer depth diagnostics with other parameter 173 ! settings set in the namzdf_mldzint namelist. 174 ! 175 ! If mld_type=1 the mixed layer depth is calculated as the depth at which the 176 ! density has increased by an amount equivalent to a temperature difference of 177 ! 0.8C at the surface. 178 ! 179 ! For other values of mld_type the mixed layer is calculated as the depth at 180 ! which the temperature differs by 0.8C from the surface temperature. 181 ! 182 ! David Acreman, Daley Calvert 183 ! 184 !!----------------------------------------------------------------------------------- 185 186 INTEGER, INTENT(in) :: kt ! ocean time-step index 187 ! 188 ! Local variables 189 INTEGER, POINTER, DIMENSION(:,:) :: ikmt ! number of active tracer levels 190 INTEGER, POINTER, DIMENSION(:,:) :: ik_ref ! index of reference level 191 INTEGER, POINTER, DIMENSION(:,:) :: ik_iso ! index of last uniform temp level 192 REAL, POINTER, DIMENSION(:,:,:) :: zT ! Temperature or density 193 REAL, POINTER, DIMENSION(:,:) :: ppzdep ! depth for use in calculating d(rho) 194 REAL, POINTER, DIMENSION(:,:) :: zT_ref ! reference temperature 195 REAL :: zT_b ! base temperature 196 REAL, POINTER, DIMENSION(:,:,:) :: zdTdz ! gradient of zT 197 REAL, POINTER, DIMENSION(:,:,:) :: zmoddT ! Absolute temperature difference 198 REAL :: zdz ! depth difference 199 REAL :: zdT ! temperature difference 200 REAL, POINTER, DIMENSION(:,:) :: zdelta_T ! difference critereon 201 REAL, POINTER, DIMENSION(:,:) :: zRHO1, zRHO2 ! Densities 202 INTEGER :: ji, jj, jk ! loop counter 203 INTEGER :: ios 204 205 NAMELIST/namzdf_mldzint/ nn_mld_type, rn_zref, rn_dT_crit, rn_iso_frac 206 207 !!------------------------------------------------------------------------------------- 208 ! 209 CALL wrk_alloc( jpi, jpj, ikmt, ik_ref, ik_iso) 210 CALL wrk_alloc( jpi, jpj, ppzdep, zT_ref, zdelta_T, zRHO1, zRHO2 ) 211 CALL wrk_alloc( jpi, jpj, jpk, zT, zdTdz, zmoddT ) 212 213 IF( kt == nit000 ) THEN 214 REWIND( numnam_ref ) ! Namelist namzdf_mldzint in reference namelist 215 READ ( numnam_ref, namzdf_mldzint, IOSTAT = ios, ERR = 901) 216 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_mldzint in reference namelist', lwp ) 217 218 REWIND( numnam_cfg ) ! Namelist namzdf_mldzint in configuration namelist 219 READ ( numnam_cfg, namzdf_mldzint, IOSTAT = ios, ERR = 902 ) 220 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_mldzint in configuration namelist', lwp ) 221 IF(lwm) WRITE ( numond, namzdf_mldzint ) 222 223 WRITE(numout,*) '===== Vertically-interpolated mixed layer =====' 224 WRITE(numout,*) 'nn_mld_type = ',nn_mld_type 225 WRITE(numout,*) 'rn_zref = ',rn_zref 226 WRITE(numout,*) 'rn_dT_crit = ',rn_dT_crit 227 WRITE(numout,*) 'rn_iso_frac = ',rn_iso_frac 228 WRITE(numout,*) '===============================================' 229 ENDIF 230 231 ! Set the mixed layer depth criterion at each grid point 232 IF (nn_mld_type == 1) THEN 233 ppzdep(:,:)=0.0 234 call eos ( tsn(:,:,1,:), ppzdep(:,:), zRHO1(:,:) ) 235 ! Use zT temporarily as a copy of tsn with rn_dT_crit added to SST 236 ! [assumes number of tracers less than number of vertical levels] 237 zT(:,:,1:jpts)=tsn(:,:,1,1:jpts) 238 zT(:,:,jp_tem)=zT(:,:,1)+rn_dT_crit 239 CALL eos( zT(:,:,1:jpts), ppzdep(:,:), zRHO2(:,:) ) 240 zdelta_T(:,:) = abs( zRHO1(:,:) - zRHO2(:,:) ) * rau0 241 ! RHO from eos (2d version) doesn't calculate north or east halo: 242 CALL lbc_lnk( zdelta_T, 'T', 1. ) 243 zT(:,:,:) = rhop(:,:,:) 244 ELSE 245 zdelta_T(:,:) = rn_dT_crit 246 zT(:,:,:) = tsn(:,:,:,jp_tem) 247 END IF 248 249 ! Calculate the gradient of zT and absolute difference for use later 250 DO jk = 1 ,jpk-2 251 zdTdz(:,:,jk) = ( zT(:,:,jk+1) - zT(:,:,jk) ) / fse3w(:,:,jk+1) 252 zmoddT(:,:,jk) = abs( zT(:,:,jk+1) - zT(:,:,jk) ) 253 END DO 254 255 ! Find density/temperature at the reference level (Kara et al use 10m). 256 ! ik_ref is the index of the box centre immediately above or at the reference level 257 ! Find rn_zref in the array of model level depths and find the ref 258 ! density/temperature by linear interpolation. 259 DO jk = jpkm1, 2, -1 260 WHERE ( fsdept(:,:,jk) > rn_zref ) 261 ik_ref(:,:) = jk - 1 262 zT_ref(:,:) = zT(:,:,jk-1) + zdTdz(:,:,jk-1) * ( rn_zref - fsdept(:,:,jk-1) ) 263 END WHERE 264 END DO 265 266 ! If the first grid box centre is below the reference level then use the 267 ! top model level to get zT_ref 268 WHERE ( fsdept(:,:,1) > rn_zref ) 269 zT_ref = zT(:,:,1) 270 ik_ref = 1 271 END WHERE 272 273 ! The number of active tracer levels is 1 less than the number of active w levels 274 ikmt(:,:) = mbathy(:,:) - 1 275 276 ! Search for a uniform density/temperature region where adjacent levels 277 ! differ by less than rn_iso_frac * deltaT. 278 ! ik_iso is the index of the last level in the uniform layer 279 ! ll_found indicates whether the mixed layer depth can be found by interpolation 280 ik_iso(:,:) = ik_ref(:,:) 281 ll_found(:,:) = .false. 282 DO jj = 1, nlcj 283 DO ji = 1, nlci 284 !CDIR NOVECTOR 285 DO jk = ik_ref(ji,jj), ikmt(ji,jj)-1 286 IF ( zmoddT(ji,jj,jk) > ( rn_iso_frac * zdelta_T(ji,jj) ) ) THEN 287 ik_iso(ji,jj) = jk 288 ll_found(ji,jj) = ( zmoddT(ji,jj,jk) > zdelta_T(ji,jj) ) 289 EXIT 290 END IF 291 END DO 292 END DO 293 END DO 294 295 ! Use linear interpolation to find depth of mixed layer base where possible 296 hmld_zint(:,:) = rn_zref 297 DO jj = 1, jpj 298 DO ji = 1, jpi 299 IF (ll_found(ji,jj) .and. tmask(ji,jj,1) == 1.0) THEN 300 zdz = abs( zdelta_T(ji,jj) / zdTdz(ji,jj,ik_iso(ji,jj)) ) 301 hmld_zint(ji,jj) = fsdept(ji,jj,ik_iso(ji,jj)) + zdz 302 END IF 303 END DO 304 END DO 305 306 ! If ll_found = .false. then calculate MLD using difference of zdelta_T 307 ! from the reference density/temperature 308 309 ! Prevent this section from working on land points 310 WHERE ( tmask(:,:,1) /= 1.0 ) 311 ll_found = .true. 312 END WHERE 313 314 DO jk=1, jpk 315 ll_belowml(:,:,jk) = abs( zT(:,:,jk) - zT_ref(:,:) ) >= zdelta_T(:,:) 316 END DO 317 318 ! Set default value where interpolation cannot be used (ll_found=false) 319 DO jj = 1, jpj 320 DO ji = 1, jpi 321 IF ( .not. ll_found(ji,jj) ) hmld_zint(ji,jj) = fsdept(ji,jj,ikmt(ji,jj)) 322 END DO 323 END DO 324 325 DO jj = 1, jpj 326 DO ji = 1, jpi 327 !CDIR NOVECTOR 328 DO jk = ik_ref(ji,jj)+1, ikmt(ji,jj) 329 IF ( ll_found(ji,jj) ) EXIT 330 IF ( ll_belowml(ji,jj,jk) ) THEN 331 zT_b = zT_ref(ji,jj) + zdelta_T(ji,jj) * SIGN(1.0, zdTdz(ji,jj,jk-1) ) 332 zdT = zT_b - zT(ji,jj,jk-1) 333 zdz = zdT / zdTdz(ji,jj,jk-1) 334 hmld_zint(ji,jj) = fsdept(ji,jj,jk-1) + zdz 335 EXIT 336 END IF 337 END DO 338 END DO 339 END DO 340 341 hmld_zint(:,:) = hmld_zint(:,:)*tmask(:,:,1) 342 ! 343 CALL wrk_dealloc( jpi, jpj, ikmt, ik_ref, ik_iso) 344 CALL wrk_dealloc( jpi, jpj, ppzdep, zT_ref, zdelta_T, zRHO1, zRHO2 ) 345 CALL wrk_dealloc( jpi,jpj, jpk, zT, zdTdz, zmoddT ) 346 ! 347 END SUBROUTINE zdf_mxl_zint 146 348 147 349 !!======================================================================
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