MODULE p4zlys !!====================================================================== !! *** MODULE p4zlys *** !! TOP : PISCES !!====================================================================== !! History : - ! 1988-07 (E. MAIER-REIMER) Original code !! - ! 1998 (O. Aumont) additions !! - ! 1999 (C. Le Quere) modifications !! 1.0 ! 2004 (O. Aumont) modifications !! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90 !! ! 2011-02 (J. Simeon, J. Orr) Calcon salinity dependence !! 3.4 ! 2011-06 (O. Aumont, C. Ethe) Improvment of calcite dissolution !! 3.6 ! 2015-05 (O. Aumont) PISCES quota !!---------------------------------------------------------------------- !! p4z_lys : Compute the CaCO3 dissolution !! p4z_lys_init : Read the namelist parameters !!---------------------------------------------------------------------- USE oce_trc ! shared variables between ocean and passive tracers USE trc ! passive tracers common variables USE sms_pisces ! PISCES Source Minus Sink variables USE p4zche ! Chemical model USE prtctl_trc ! print control for debugging USE iom ! I/O manager IMPLICIT NONE PRIVATE PUBLIC p4z_lys ! called in trcsms_pisces.F90 PUBLIC p4z_lys_init ! called in trcsms_pisces.F90 REAL(wp), PUBLIC :: kdca !: diss. rate constant calcite REAL(wp), PUBLIC :: nca !: order of reaction for calcite dissolution INTEGER :: rmtss ! number of seconds per month REAL(wp) :: calcon = 1.03E-2 ! mean calcite concentration [Ca2+] in sea water [mole/kg solution] !!---------------------------------------------------------------------- !! NEMO/TOP 4.0 , NEMO Consortium (2018) !! $Id$ !! Software governed by the CeCILL license (see ./LICENSE) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE p4z_lys( kt, knt ) !!--------------------------------------------------------------------- !! *** ROUTINE p4z_lys *** !! !! ** Purpose : CALCULATES DEGREE OF CACO3 SATURATION IN THE WATER !! COLUMN, DISSOLUTION/PRECIPITATION OF CACO3 AND LOSS !! OF CACO3 TO THE CACO3 SEDIMENT POOL. !! !! ** Method : - ??? !!--------------------------------------------------------------------- INTEGER, INTENT(in) :: kt, knt ! ocean time step and ??? ! INTEGER :: ji, jj, jk, jn REAL(wp) :: zdispot, zfact, zcalcon REAL(wp) :: zomegaca, zexcess, zexcess0 CHARACTER (len=25) :: charout REAL(wp), DIMENSION(jpi,jpj,jpk) :: zco3, zcaldiss, zhinit, zhi, zco3sat !!--------------------------------------------------------------------- ! IF( ln_timing ) CALL timing_start('p4z_lys') ! zco3 (:,:,:) = 0. zcaldiss(:,:,:) = 0. zhinit (:,:,:) = hi(:,:,:) * 1000. / ( rhop(:,:,:) + rtrn ) ! ! ------------------------------------------- ! COMPUTE [CO3--] and [H+] CONCENTRATIONS ! ------------------------------------------- CALL solve_at_general( zhinit, zhi ) DO jk = 1, jpkm1 DO jj = 1, jpj DO ji = 1, jpi zco3(ji,jj,jk) = trb(ji,jj,jk,jpdic) * ak13(ji,jj,jk) * ak23(ji,jj,jk) / (zhi(ji,jj,jk)**2 & & + ak13(ji,jj,jk) * zhi(ji,jj,jk) + ak13(ji,jj,jk) * ak23(ji,jj,jk) + rtrn ) hi (ji,jj,jk) = zhi(ji,jj,jk) * rhop(ji,jj,jk) / 1000. END DO END DO END DO ! --------------------------------------------------------- ! CALCULATE DEGREE OF CACO3 SATURATION AND CORRESPONDING ! DISSOLOUTION AND PRECIPITATION OF CACO3 (BE AWARE OF ! MGCO3) ! --------------------------------------------------------- DO jk = 1, jpkm1 DO jj = 1, jpj DO ji = 1, jpi ! DEVIATION OF [CO3--] FROM SATURATION VALUE ! Salinity dependance in zomegaca and divide by rhop/1000 to have good units zcalcon = calcon * ( salinprac(ji,jj,jk) / 35._wp ) zfact = rhop(ji,jj,jk) / 1000._wp zomegaca = ( zcalcon * zco3(ji,jj,jk) ) / ( aksp(ji,jj,jk) * zfact + rtrn ) zco3sat(ji,jj,jk) = aksp(ji,jj,jk) * zfact / ( zcalcon + rtrn ) ! SET DEGREE OF UNDER-/SUPERSATURATION excess(ji,jj,jk) = 1._wp - zomegaca zexcess0 = MAX( 0., excess(ji,jj,jk) ) zexcess = zexcess0**nca ! AMOUNT CACO3 (12C) THAT RE-ENTERS SOLUTION ! (ACCORDING TO THIS FORMULATION ALSO SOME PARTICULATE ! CACO3 GETS DISSOLVED EVEN IN THE CASE OF OVERSATURATION) zdispot = kdca * zexcess * trb(ji,jj,jk,jpcal) ! CHANGE OF [CO3--] , [ALK], PARTICULATE [CACO3], ! AND [SUM(CO2)] DUE TO CACO3 DISSOLUTION/PRECIPITATION zcaldiss(ji,jj,jk) = zdispot * rfact2 / rmtss ! calcite dissolution ! tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + 2. * zcaldiss(ji,jj,jk) tra(ji,jj,jk,jpcal) = tra(ji,jj,jk,jpcal) - zcaldiss(ji,jj,jk) tra(ji,jj,jk,jpdic) = tra(ji,jj,jk,jpdic) + zcaldiss(ji,jj,jk) END DO END DO END DO ! IF( lk_iomput .AND. knt == nrdttrc ) THEN IF( iom_use( "PH" ) ) CALL iom_put( "PH" , -1. * LOG10( MAX( hi(:,:,:), rtrn ) ) * tmask(:,:,:) ) IF( iom_use( "CO3" ) ) CALL iom_put( "CO3" , zco3(:,:,:) * 1.e+3 * tmask(:,:,:) ) IF( iom_use( "CO3sat" ) ) CALL iom_put( "CO3sat", zco3sat(:,:,:) * 1.e+3 * tmask(:,:,:) ) IF( iom_use( "DCAL" ) ) CALL iom_put( "DCAL" , zcaldiss(:,:,:) * 1.e+3 * rfact2r * tmask(:,:,:) ) ENDIF ! IF(sn_cfctl%l_prttrc) THEN ! print mean trends (used for debugging) WRITE(charout, FMT="('lys ')") CALL prt_ctl_trc_info(charout) CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm) ENDIF ! IF( ln_timing ) CALL timing_stop('p4z_lys') ! END SUBROUTINE p4z_lys SUBROUTINE p4z_lys_init !!---------------------------------------------------------------------- !! *** ROUTINE p4z_lys_init *** !! !! ** Purpose : Initialization of CaCO3 dissolution parameters !! !! ** Method : Read the nampiscal namelist and check the parameters !! called at the first timestep (nittrc000) !! !! ** input : Namelist nampiscal !! !!---------------------------------------------------------------------- INTEGER :: ios ! Local integer ! NAMELIST/nampiscal/ kdca, nca !!---------------------------------------------------------------------- IF(lwp) THEN WRITE(numout,*) WRITE(numout,*) 'p4z_lys_init : initialization of CaCO3 dissolution' WRITE(numout,*) '~~~~~~~~~~~~' ENDIF ! REWIND( numnatp_ref ) ! Namelist nampiscal in reference namelist : Pisces CaCO3 dissolution READ ( numnatp_ref, nampiscal, IOSTAT = ios, ERR = 901) 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nampiscal in reference namelist' ) REWIND( numnatp_cfg ) ! Namelist nampiscal in configuration namelist : Pisces CaCO3 dissolution READ ( numnatp_cfg, nampiscal, IOSTAT = ios, ERR = 902 ) 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'nampiscal in configuration namelist' ) IF(lwm) WRITE( numonp, nampiscal ) ! IF(lwp) THEN ! control print WRITE(numout,*) ' Namelist : nampiscal' WRITE(numout,*) ' diss. rate constant calcite (per month) kdca =', kdca WRITE(numout,*) ' order of reaction for calcite dissolution nca =', nca ENDIF ! ! Number of seconds per month rmtss = nyear_len(1) * rday / raamo ! END SUBROUTINE p4z_lys_init !!====================================================================== END MODULE p4zlys