- Timestamp:
- 2016-11-18T08:18:45+01:00 (7 years ago)
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- 1 edited
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branches/2015/dev_r5003_MERCATOR6_CRS/NEMOGCM/NEMO/LIM_SRC_3/limthd_dh.F90
r5602 r7256 74 74 75 75 REAL(wp) :: ztmelts ! local scalar 76 REAL(wp) :: z fdum76 REAL(wp) :: zdum 77 77 REAL(wp) :: zfracs ! fractionation coefficient for bottom salt entrapment 78 78 REAL(wp) :: zs_snic ! snow-ice salinity … … 95 95 REAL(wp), POINTER, DIMENSION(:) :: zq_rema ! remaining heat at the end of the routine (J.m-2) 96 96 REAL(wp), POINTER, DIMENSION(:) :: zf_tt ! Heat budget to determine melting or freezing(W.m-2) 97 REAL(wp), POINTER, DIMENSION(:) :: zevap_rema ! remaining mass flux from sublimation (kg.m-2) 97 98 98 99 REAL(wp), POINTER, DIMENSION(:) :: zdh_s_mel ! snow melt … … 105 106 106 107 REAL(wp), POINTER, DIMENSION(:) :: zqh_i ! total ice heat content (J.m-2) 107 REAL(wp), POINTER, DIMENSION(:) :: zqh_s ! total snow heat content (J.m-2)108 REAL(wp), POINTER, DIMENSION(:) :: zq_s ! total snow enthalpy (J.m-3)109 108 REAL(wp), POINTER, DIMENSION(:) :: zsnw ! distribution of snow after wind blowing 110 109 … … 117 116 118 117 ! Discriminate between varying salinity (nn_icesal=2) and prescribed cases (other values) 119 SELECT CASE( nn_icesal ) 120 CASE( 1, 3 , 4) ; zswitch_sal = 0 ! prescribed salinity profile121 CASE( 2 ) 118 SELECT CASE( nn_icesal ) ! varying salinity or not 119 CASE( 1, 3 ) ; zswitch_sal = 0 ! prescribed salinity profile 120 CASE( 2 ) ; zswitch_sal = 1 ! varying salinity profile 122 121 END SELECT 123 122 124 CALL wrk_alloc( jpij, zqprec, zq_su, zq_bo, zf_tt, zq_rema, zsnw )125 CALL wrk_alloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zqh_i , zqh_s, zq_s)123 CALL wrk_alloc( jpij, zqprec, zq_su, zq_bo, zf_tt, zq_rema, zsnw, zevap_rema ) 124 CALL wrk_alloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zqh_i ) 126 125 CALL wrk_alloc( jpij, nlay_i, zdeltah, zh_i ) 127 126 CALL wrk_alloc( jpij, nlay_i, icount ) 128 127 129 dh_i_surf (:) = 0._wp ; dh_i_bott (:) = 0._wp ; dh_snowice(:) = 0._wp 128 dh_i_surf (:) = 0._wp ; dh_i_bott (:) = 0._wp ; dh_snowice(:) = 0._wp ; dh_i_sub(:) = 0._wp 130 129 dsm_i_se_1d(:) = 0._wp ; dsm_i_si_1d(:) = 0._wp 131 130 132 131 zqprec (:) = 0._wp ; zq_su (:) = 0._wp ; zq_bo (:) = 0._wp ; zf_tt(:) = 0._wp 133 zq_rema (:) = 0._wp ; zsnw (:) = 0._wp 132 zq_rema (:) = 0._wp ; zsnw (:) = 0._wp ; zevap_rema(:) = 0._wp ; 134 133 zdh_s_mel(:) = 0._wp ; zdh_s_pre(:) = 0._wp ; zdh_s_sub(:) = 0._wp ; zqh_i(:) = 0._wp 135 zqh_s (:) = 0._wp ; zq_s (:) = 0._wp136 134 137 135 zdeltah(:,:) = 0._wp ; zh_i(:,:) = 0._wp … … 159 157 ! 160 158 DO ji = kideb, kiut 161 z fdum= qns_ice_1d(ji) + ( 1._wp - i0(ji) ) * qsr_ice_1d(ji) - fc_su(ji)159 zdum = qns_ice_1d(ji) + ( 1._wp - i0(ji) ) * qsr_ice_1d(ji) - fc_su(ji) 162 160 zf_tt(ji) = fc_bo_i(ji) + fhtur_1d(ji) + fhld_1d(ji) 163 161 164 zq_su (ji) = MAX( 0._wp, z fdum* rdt_ice ) * MAX( 0._wp , SIGN( 1._wp, t_su_1d(ji) - rt0 ) )162 zq_su (ji) = MAX( 0._wp, zdum * rdt_ice ) * MAX( 0._wp , SIGN( 1._wp, t_su_1d(ji) - rt0 ) ) 165 163 zq_bo (ji) = MAX( 0._wp, zf_tt(ji) * rdt_ice ) 166 164 END DO … … 187 185 ! 2) Computing layer thicknesses and enthalpies. ! 188 186 !------------------------------------------------------------! 189 !190 DO jk = 1, nlay_s191 DO ji = kideb, kiut192 zqh_s(ji) = zqh_s(ji) + q_s_1d(ji,jk) * ht_s_1d(ji) * r1_nlay_s193 END DO194 END DO195 187 ! 196 188 DO jk = 1, nlay_i … … 275 267 END DO 276 268 277 !---------------------- 278 ! 3.2 S now sublimation279 !---------------------- 269 !------------------------------ 270 ! 3.2 Sublimation (part1: snow) 271 !------------------------------ 280 272 ! qla_ice is always >=0 (upwards), heat goes to the atmosphere, therefore snow sublimates 281 273 ! clem comment: not counted in mass/heat exchange in limsbc since this is an exchange with atm. (not ocean) 282 ! clem comment: ice should also sublimate283 274 zdeltah(:,:) = 0._wp 284 ! coupled mode: sublimation is set to 0 (evap_ice = 0) until further notice 285 ! forced mode: snow thickness change due to sublimation 286 DO ji = kideb, kiut 287 zdh_s_sub(ji) = MAX( - ht_s_1d(ji) , - evap_ice_1d(ji) * r1_rhosn * rdt_ice ) 288 ! Heat flux by sublimation [W.m-2], < 0 289 ! sublimate first snow that had fallen, then pre-existing snow 275 DO ji = kideb, kiut 276 zdh_s_sub(ji) = MAX( - ht_s_1d(ji) , - evap_ice_1d(ji) * r1_rhosn * rdt_ice ) 277 ! remaining evap in kg.m-2 (used for ice melting later on) 278 zevap_rema(ji) = evap_ice_1d(ji) * rdt_ice + zdh_s_sub(ji) * rhosn 279 ! Heat flux by sublimation [W.m-2], < 0 (sublimate first snow that had fallen, then pre-existing snow) 290 280 zdeltah(ji,1) = MAX( zdh_s_sub(ji), - zdh_s_pre(ji) ) 291 281 hfx_sub_1d(ji) = hfx_sub_1d(ji) + ( zdeltah(ji,1) * zqprec(ji) + ( zdh_s_sub(ji) - zdeltah(ji,1) ) * q_s_1d(ji,1) & … … 309 299 !------------------------------------------- 310 300 ! new temp and enthalpy of the snow (remaining snow precip + remaining pre-existing snow) 311 zq_s(:) = 0._wp312 301 DO jk = 1, nlay_s 313 302 DO ji = kideb,kiut 314 rswitch = MAX( 0._wp , SIGN( 1._wp, ht_s_1d(ji) - epsi20 ) ) 315 q_s_1d(ji,jk) = rswitch / MAX( ht_s_1d(ji), epsi20 ) * & 316 & ( ( zdh_s_pre(ji) ) * zqprec(ji) + & 317 & ( ht_s_1d(ji) - zdh_s_pre(ji) ) * rhosn * ( cpic * ( rt0 - t_s_1d(ji,jk) ) + lfus ) ) 318 zq_s(ji) = zq_s(ji) + q_s_1d(ji,jk) 303 rswitch = MAX( 0._wp , SIGN( 1._wp, ht_s_1d(ji) - epsi20 ) ) 304 q_s_1d(ji,jk) = rswitch / MAX( ht_s_1d(ji), epsi20 ) * & 305 & ( ( zdh_s_pre(ji) ) * zqprec(ji) + & 306 & ( ht_s_1d(ji) - zdh_s_pre(ji) ) * rhosn * ( cpic * ( rt0 - t_s_1d(ji,jk) ) + lfus ) ) 319 307 END DO 320 308 END DO … … 370 358 zQm = zfmdt * zEw ! Energy of the melt water sent to the ocean [J/m2, <0] 371 359 372 ! Contribution to salt flux (clem: using sm_i_1d and not s_i_1d(jk) is ok)360 ! Contribution to salt flux >0 (clem: using sm_i_1d and not s_i_1d(jk) is ok) 373 361 sfx_sum_1d(ji) = sfx_sum_1d(ji) - rhoic * a_i_1d(ji) * zdeltah(ji,jk) * sm_i_1d(ji) * r1_rdtice 374 362 … … 383 371 384 372 END IF 373 ! ---------------------- 374 ! Sublimation part2: ice 375 ! ---------------------- 376 zdum = MAX( - ( zh_i(ji,jk) + zdeltah(ji,jk) ) , - zevap_rema(ji) * r1_rhoic ) 377 zdeltah(ji,jk) = zdeltah(ji,jk) + zdum 378 dh_i_sub(ji) = dh_i_sub(ji) + zdum 379 ! Salt flux > 0 (clem2016: flux is sent to the ocean for simplicity but salt should remain in the ice except if all ice is melted. 380 ! It must be corrected at some point) 381 sfx_sub_1d(ji) = sfx_sub_1d(ji) - rhoic * a_i_1d(ji) * zdum * sm_i_1d(ji) * r1_rdtice 382 ! Heat flux [W.m-2], < 0 383 hfx_sub_1d(ji) = hfx_sub_1d(ji) + zdum * q_i_1d(ji,jk) * a_i_1d(ji) * r1_rdtice 384 ! Mass flux > 0 385 wfx_sub_1d(ji) = wfx_sub_1d(ji) - rhoic * a_i_1d(ji) * zdum * r1_rdtice 386 ! update remaining mass flux 387 zevap_rema(ji) = zevap_rema(ji) + zdum * rhoic 388 385 389 ! record which layers have disappeared (for bottom melting) 386 390 ! => icount=0 : no layer has vanished … … 389 393 icount(ji,jk) = NINT( rswitch ) 390 394 zh_i(ji,jk) = MAX( 0._wp , zh_i(ji,jk) + zdeltah(ji,jk) ) 391 395 392 396 ! update heat content (J.m-2) and layer thickness 393 397 qh_i_old(ji,jk) = qh_i_old(ji,jk) + zdeltah(ji,jk) * q_i_1d(ji,jk) … … 397 401 ! update ice thickness 398 402 DO ji = kideb, kiut 399 ht_i_1d(ji) = MAX( 0._wp , ht_i_1d(ji) + dh_i_surf(ji) ) 403 ht_i_1d(ji) = MAX( 0._wp , ht_i_1d(ji) + dh_i_surf(ji) + dh_i_sub(ji) ) 404 END DO 405 406 ! remaining "potential" evap is sent to ocean 407 DO ji = kideb, kiut 408 ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1 409 wfx_err_sub(ii,ij) = wfx_err_sub(ii,ij) - zevap_rema(ji) * a_i_1d(ji) * r1_rdtice ! <=0 (net evap for the ocean in kg.m-2.s-1) 400 410 END DO 401 411 … … 641 651 642 652 ! Contribution to energy flux to the ocean [J/m2], >0 (if sst<0) 643 ii = MOD( npb(ji) - 1, jpi ) + 1 ; ij = ( npb(ji) - 1 ) / jpi + 1644 653 zfmdt = ( rhosn - rhoic ) * MAX( dh_snowice(ji), 0._wp ) ! <0 645 654 zsstK = sst_m(ii,ij) + rt0 … … 652 661 ! Contribution to salt flux 653 662 sfx_sni_1d(ji) = sfx_sni_1d(ji) + sss_m(ii,ij) * a_i_1d(ji) * zfmdt * r1_rdtice 663 664 ! virtual salt flux to keep salinity constant 665 IF( nn_icesal == 1 .OR. nn_icesal == 3 ) THEN 666 sfx_bri_1d(ji) = sfx_bri_1d(ji) - sss_m(ii,ij) * a_i_1d(ji) * zfmdt * r1_rdtice & ! put back sss_m into the ocean 667 & - sm_i_1d(ji) * a_i_1d(ji) * dh_snowice(ji) * rhoic * r1_rdtice ! and get sm_i from the ocean 668 ENDIF 654 669 655 670 ! Contribution to mass flux … … 686 701 WHERE( ht_i_1d == 0._wp ) a_i_1d = 0._wp 687 702 688 CALL wrk_dealloc( jpij, zqprec, zq_su, zq_bo, zf_tt, zq_rema, zsnw )689 CALL wrk_dealloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zqh_i , zqh_s, zq_s)703 CALL wrk_dealloc( jpij, zqprec, zq_su, zq_bo, zf_tt, zq_rema, zsnw, zevap_rema ) 704 CALL wrk_dealloc( jpij, zdh_s_mel, zdh_s_pre, zdh_s_sub, zqh_i ) 690 705 CALL wrk_dealloc( jpij, nlay_i, zdeltah, zh_i ) 691 706 CALL wrk_dealloc( jpij, nlay_i, icount )
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