[3443] | 1 | MODULE p4zfechem |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE p4zfechem *** |
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| 4 | !! TOP : PISCES Compute iron chemistry and scavenging |
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| 5 | !!====================================================================== |
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[3461] | 6 | !! History : 3.5 ! 2012-07 (O. Aumont, A. Tagliabue, C. Ethe) Original code |
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[7646] | 7 | !! 3.6 ! 2015-05 (O. Aumont) PISCES quota |
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[3443] | 8 | !!---------------------------------------------------------------------- |
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[9169] | 9 | !! p4z_fechem : Compute remineralization/scavenging of iron |
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| 10 | !! p4z_fechem_init : Initialisation of parameters for remineralisation |
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| 11 | !! p4z_fechem_alloc : Allocate remineralisation variables |
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[3443] | 12 | !!---------------------------------------------------------------------- |
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[9169] | 13 | USE oce_trc ! shared variables between ocean and passive tracers |
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| 14 | USE trc ! passive tracers common variables |
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| 15 | USE sms_pisces ! PISCES Source Minus Sink variables |
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| 16 | USE p4zche ! chemical model |
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[12377] | 17 | USE p4zbc ! Boundary conditions from sediments |
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[9169] | 18 | USE prtctl_trc ! print control for debugging |
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| 19 | USE iom ! I/O manager |
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[3443] | 20 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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[9169] | 24 | PUBLIC p4z_fechem ! called in p4zbio.F90 |
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| 25 | PUBLIC p4z_fechem_init ! called in trcsms_pisces.F90 |
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[3443] | 26 | |
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[9169] | 27 | LOGICAL :: ln_ligvar !: boolean for variable ligand concentration following Tagliabue and voelker |
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| 28 | REAL(wp), PUBLIC :: xlam1 !: scavenging rate of Iron |
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| 29 | REAL(wp), PUBLIC :: xlamdust !: scavenging rate of Iron by dust |
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| 30 | REAL(wp), PUBLIC :: ligand !: ligand concentration in the ocean |
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| 31 | REAL(wp), PUBLIC :: kfep !: rate constant for nanoparticle formation |
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[3443] | 32 | |
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[12377] | 33 | !! * Substitutions |
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| 34 | # include "do_loop_substitute.h90" |
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[3443] | 35 | !!---------------------------------------------------------------------- |
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[10067] | 36 | !! NEMO/TOP 4.0 , NEMO Consortium (2018) |
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[10069] | 37 | !! $Id$ |
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[10068] | 38 | !! Software governed by the CeCILL license (see ./LICENSE) |
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[3443] | 39 | !!---------------------------------------------------------------------- |
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| 40 | CONTAINS |
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| 41 | |
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[12377] | 42 | SUBROUTINE p4z_fechem( kt, knt, Kbb, Kmm, Krhs ) |
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[3443] | 43 | !!--------------------------------------------------------------------- |
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| 44 | !! *** ROUTINE p4z_fechem *** |
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| 45 | !! |
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| 46 | !! ** Purpose : Compute remineralization/scavenging of iron |
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| 47 | !! |
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[10401] | 48 | !! ** Method : A simple chemistry model of iron from Aumont and Bopp (2006) |
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| 49 | !! based on one ligand and one inorganic form |
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[3443] | 50 | !!--------------------------------------------------------------------- |
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[9169] | 51 | INTEGER, INTENT(in) :: kt, knt ! ocean time step |
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[12377] | 52 | INTEGER, INTENT(in) :: Kbb, Kmm, Krhs ! time level indices |
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[3443] | 53 | ! |
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[7646] | 54 | INTEGER :: ji, jj, jk, jic, jn |
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[3446] | 55 | REAL(wp) :: zdep, zlam1a, zlam1b, zlamfac |
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[7646] | 56 | REAL(wp) :: zkeq, zfeequi, zfesatur, zfecoll, fe3sol |
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[3446] | 57 | REAL(wp) :: zdenom1, zscave, zaggdfea, zaggdfeb, zcoag |
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[3443] | 58 | REAL(wp) :: ztrc, zdust |
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[7646] | 59 | REAL(wp) :: zdenom2 |
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| 60 | REAL(wp) :: zzFeL1, zzFeL2, zzFe2, zzFeP, zzFe3, zzstrn2 |
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| 61 | REAL(wp) :: zrum, zcodel, zargu, zlight |
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[9169] | 62 | REAL(wp) :: zkox, zkph1, zkph2, zph, zionic, ztligand |
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| 63 | REAL(wp) :: za, zb, zc, zkappa1, zkappa2, za0, za1, za2 |
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| 64 | REAL(wp) :: zxs, zfunc, zp, zq, zd, zr, zphi, zfff, zp3, zq2 |
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[10362] | 65 | REAL(wp) :: ztfe, zoxy, zhplus, zxlam |
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[9169] | 66 | REAL(wp) :: zaggliga, zaggligb |
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| 67 | REAL(wp) :: dissol, zligco |
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[10362] | 68 | REAL(wp) :: zrfact2 |
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[7646] | 69 | CHARACTER (len=25) :: charout |
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[9169] | 70 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zTL1, zFe3, ztotlig, precip, zFeL1 |
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[10362] | 71 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zcoll3d, zscav3d, zlcoll3d |
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[3443] | 72 | !!--------------------------------------------------------------------- |
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| 73 | ! |
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[9124] | 74 | IF( ln_timing ) CALL timing_start('p4z_fechem') |
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[3443] | 75 | ! |
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| 76 | ! Total ligand concentration : Ligands can be chosen to be constant or variable |
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| 77 | ! Parameterization from Tagliabue and Voelker (2011) |
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| 78 | ! ------------------------------------------------- |
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| 79 | IF( ln_ligvar ) THEN |
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[12377] | 80 | ztotlig(:,:,:) = 0.09 * tr(:,:,:,jpdoc,Kbb) * 1E6 + ligand * 1E9 |
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[7753] | 81 | ztotlig(:,:,:) = MIN( ztotlig(:,:,:), 10. ) |
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[3443] | 82 | ELSE |
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[12377] | 83 | IF( ln_ligand ) THEN ; ztotlig(:,:,:) = tr(:,:,:,jplgw,Kbb) * 1E9 |
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[7753] | 84 | ELSE ; ztotlig(:,:,:) = ligand * 1E9 |
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[7646] | 85 | ENDIF |
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[3443] | 86 | ENDIF |
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| 87 | |
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[10401] | 88 | ! ------------------------------------------------------------ |
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| 89 | ! from Aumont and Bopp (2006) |
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| 90 | ! This model is based on one ligand and Fe' |
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| 91 | ! Chemistry is supposed to be fast enough to be at equilibrium |
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| 92 | ! ------------------------------------------------------------ |
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[12377] | 93 | DO_3D_11_11( 1, jpkm1 ) |
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| 94 | zTL1(ji,jj,jk) = ztotlig(ji,jj,jk) |
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| 95 | zkeq = fekeq(ji,jj,jk) |
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| 96 | zfesatur = zTL1(ji,jj,jk) * 1E-9 |
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| 97 | ztfe = tr(ji,jj,jk,jpfer,Kbb) |
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| 98 | ! Fe' is the root of a 2nd order polynom |
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| 99 | zFe3 (ji,jj,jk) = ( -( 1. + zfesatur * zkeq - zkeq * ztfe ) & |
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| 100 | & + SQRT( ( 1. + zfesatur * zkeq - zkeq * ztfe )**2 & |
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| 101 | & + 4. * ztfe * zkeq) ) / ( 2. * zkeq ) |
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| 102 | zFe3 (ji,jj,jk) = zFe3(ji,jj,jk) * 1E9 |
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| 103 | zFeL1(ji,jj,jk) = MAX( 0., tr(ji,jj,jk,jpfer,Kbb) * 1E9 - zFe3(ji,jj,jk) ) |
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| 104 | END_3D |
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[3443] | 105 | ! |
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[7646] | 106 | |
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[3531] | 107 | zdust = 0. ! if no dust available |
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[12377] | 108 | DO_3D_11_11( 1, jpkm1 ) |
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| 109 | ! Scavenging rate of iron. This scavenging rate depends on the load of particles of sea water. |
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| 110 | ! This parameterization assumes a simple second order kinetics (k[Particles][Fe]). |
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| 111 | ! Scavenging onto dust is also included as evidenced from the DUNE experiments. |
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| 112 | ! -------------------------------------------------------------------------------------- |
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| 113 | zhplus = max( rtrn, hi(ji,jj,jk) ) |
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| 114 | fe3sol = fesol(ji,jj,jk,1) * ( zhplus**3 + fesol(ji,jj,jk,2) * zhplus**2 & |
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| 115 | & + fesol(ji,jj,jk,3) * zhplus + fesol(ji,jj,jk,4) & |
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| 116 | & + fesol(ji,jj,jk,5) / zhplus ) |
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| 117 | ! |
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| 118 | zfeequi = zFe3(ji,jj,jk) * 1E-9 |
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| 119 | zhplus = max( rtrn, hi(ji,jj,jk) ) |
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| 120 | fe3sol = fesol(ji,jj,jk,1) * ( zhplus**3 + fesol(ji,jj,jk,2) * zhplus**2 & |
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| 121 | & + fesol(ji,jj,jk,3) * zhplus + fesol(ji,jj,jk,4) & |
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| 122 | & + fesol(ji,jj,jk,5) / zhplus ) |
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| 123 | zfecoll = 0.5 * zFeL1(ji,jj,jk) * 1E-9 |
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| 124 | ! precipitation of Fe3+, creation of nanoparticles |
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| 125 | precip(ji,jj,jk) = MAX( 0., ( zFe3(ji,jj,jk) * 1E-9 - fe3sol ) ) * kfep * xstep |
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| 126 | ! |
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| 127 | ztrc = ( tr(ji,jj,jk,jppoc,Kbb) + tr(ji,jj,jk,jpgoc,Kbb) + tr(ji,jj,jk,jpcal,Kbb) + tr(ji,jj,jk,jpgsi,Kbb) ) * 1.e6 |
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| 128 | IF( ll_dust ) zdust = dust(ji,jj) / ( wdust / rday ) * tmask(ji,jj,jk) & |
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| 129 | & * EXP( -gdept(ji,jj,jk,Kmm) / 540. ) |
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| 130 | IF (ln_ligand) THEN |
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| 131 | zxlam = xlam1 * MAX( 1.E-3, EXP(-2 * etot(ji,jj,jk) / 10. ) * (1. - EXP(-2 * tr(ji,jj,jk,jpoxy,Kbb) / 100.E-6 ) )) |
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| 132 | ELSE |
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| 133 | zxlam = xlam1 * 1.0 |
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| 134 | ENDIF |
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| 135 | zlam1b = 3.e-5 + xlamdust * zdust + zxlam * ztrc |
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| 136 | zscave = zfeequi * zlam1b * xstep |
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[3443] | 137 | |
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[12377] | 138 | ! Compute the different ratios for scavenging of iron |
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| 139 | ! to later allocate scavenged iron to the different organic pools |
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| 140 | ! --------------------------------------------------------- |
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| 141 | zdenom1 = zxlam * tr(ji,jj,jk,jppoc,Kbb) / zlam1b |
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| 142 | zdenom2 = zxlam * tr(ji,jj,jk,jpgoc,Kbb) / zlam1b |
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[3443] | 143 | |
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[12377] | 144 | ! Increased scavenging for very high iron concentrations found near the coasts |
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| 145 | ! due to increased lithogenic particles and let say it is unknown processes (precipitation, ...) |
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| 146 | ! ----------------------------------------------------------- |
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| 147 | zlamfac = MAX( 0.e0, ( gphit(ji,jj) + 55.) / 30. ) |
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| 148 | zlamfac = MIN( 1. , zlamfac ) |
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| 149 | zdep = MIN( 1., 1000. / gdept(ji,jj,jk,Kmm) ) |
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| 150 | zcoag = 1E-4 * ( 1. - zlamfac ) * zdep * xstep * tr(ji,jj,jk,jpfer,Kbb) |
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[3443] | 151 | |
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[12377] | 152 | ! Compute the coagulation of colloidal iron. This parameterization |
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| 153 | ! could be thought as an equivalent of colloidal pumping. |
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| 154 | ! It requires certainly some more work as it is very poorly constrained. |
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| 155 | ! ---------------------------------------------------------------- |
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| 156 | zlam1a = ( 0.369 * 0.3 * tr(ji,jj,jk,jpdoc,Kbb) + 102.4 * tr(ji,jj,jk,jppoc,Kbb) ) * xdiss(ji,jj,jk) & |
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| 157 | & + ( 114. * 0.3 * tr(ji,jj,jk,jpdoc,Kbb) ) |
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| 158 | zaggdfea = zlam1a * xstep * zfecoll |
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| 159 | ! |
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| 160 | zlam1b = 3.53E3 * tr(ji,jj,jk,jpgoc,Kbb) * xdiss(ji,jj,jk) |
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| 161 | zaggdfeb = zlam1b * xstep * zfecoll |
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| 162 | ! |
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| 163 | tr(ji,jj,jk,jpfer,Krhs) = tr(ji,jj,jk,jpfer,Krhs) - zscave - zaggdfea - zaggdfeb & |
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| 164 | & - zcoag - precip(ji,jj,jk) |
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| 165 | tr(ji,jj,jk,jpsfe,Krhs) = tr(ji,jj,jk,jpsfe,Krhs) + zscave * zdenom1 + zaggdfea |
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| 166 | tr(ji,jj,jk,jpbfe,Krhs) = tr(ji,jj,jk,jpbfe,Krhs) + zscave * zdenom2 + zaggdfeb |
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| 167 | zscav3d(ji,jj,jk) = zscave |
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| 168 | zcoll3d(ji,jj,jk) = zaggdfea + zaggdfeb |
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| 169 | ! |
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| 170 | END_3D |
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[3443] | 171 | ! |
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[3446] | 172 | ! Define the bioavailable fraction of iron |
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| 173 | ! ---------------------------------------- |
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[12377] | 174 | biron(:,:,:) = tr(:,:,:,jpfer,Kbb) |
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[7646] | 175 | ! |
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| 176 | IF( ln_ligand ) THEN |
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| 177 | ! |
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[12377] | 178 | DO_3D_11_11( 1, jpkm1 ) |
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| 179 | zlam1a = ( 0.369 * 0.3 * tr(ji,jj,jk,jpdoc,Kbb) + 102.4 * tr(ji,jj,jk,jppoc,Kbb) ) * xdiss(ji,jj,jk) & |
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| 180 | & + ( 114. * 0.3 * tr(ji,jj,jk,jpdoc,Kbb) ) |
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| 181 | ! |
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| 182 | zlam1b = 3.53E3 * tr(ji,jj,jk,jpgoc,Kbb) * xdiss(ji,jj,jk) |
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| 183 | zligco = 0.5 * tr(ji,jj,jk,jplgw,Kmm) |
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| 184 | zaggliga = zlam1a * xstep * zligco |
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| 185 | zaggligb = zlam1b * xstep * zligco |
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| 186 | tr(ji,jj,jk,jplgw,Krhs) = tr(ji,jj,jk,jplgw,Krhs) - zaggliga - zaggligb |
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| 187 | zlcoll3d(ji,jj,jk) = zaggliga + zaggligb |
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| 188 | END_3D |
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[7646] | 189 | ! |
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[12377] | 190 | plig(:,:,:) = MAX( 0., ( ( zFeL1(:,:,:) * 1E-9 ) / ( tr(:,:,:,jpfer,Kbb) +rtrn ) ) ) |
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[7646] | 191 | ! |
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| 192 | ENDIF |
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[3443] | 193 | ! Output of some diagnostics variables |
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| 194 | ! --------------------------------- |
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[7646] | 195 | IF( lk_iomput ) THEN |
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| 196 | IF( knt == nrdttrc ) THEN |
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[10401] | 197 | zrfact2 = 1.e3 * rfact2r ! conversion from mol/L/timestep into mol/m3/s |
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[12276] | 198 | IF( iom_use("Fe3") ) THEN |
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| 199 | zFe3(:,:,jpk) = 0. ; CALL iom_put("Fe3" , zFe3(:,:,:) * tmask(:,:,:) ) ! Fe3+ |
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| 200 | ENDIF |
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| 201 | IF( iom_use("FeL1") ) THEN |
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| 202 | zFeL1(:,:,jpk) = 0. ; CALL iom_put("FeL1", zFeL1(:,:,:) * tmask(:,:,:) ) ! FeL1 |
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| 203 | ENDIF |
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| 204 | IF( iom_use("TL1") ) THEN |
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| 205 | zTL1(:,:,jpk) = 0. ; CALL iom_put("TL1" , zTL1(:,:,:) * tmask(:,:,:) ) ! TL1 |
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| 206 | ENDIF |
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[12377] | 207 | IF( iom_use("Totlig") ) CALL iom_put("Totlig" , ztotlig(:,:,:) * tmask(:,:,:) ) ! TL |
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| 208 | IF( iom_use("Biron") ) CALL iom_put("Biron" , biron (:,:,:) * 1e9 * tmask(:,:,:) ) ! biron |
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[12276] | 209 | IF( iom_use("FESCAV") ) THEN |
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| 210 | zscav3d (:,:,jpk) = 0. ; CALL iom_put("FESCAV" , zscav3d(:,:,:) * 1e9 * tmask(:,:,:) * zrfact2 ) |
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| 211 | ENDIF |
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| 212 | IF( iom_use("FECOLL") ) THEN |
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| 213 | zcoll3d (:,:,jpk) = 0. ; CALL iom_put("FECOLL" , zcoll3d(:,:,:) * 1e9 * tmask(:,:,:) * zrfact2 ) |
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| 214 | ENDIF |
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| 215 | IF( iom_use("LGWCOLL")) THEN |
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| 216 | zlcoll3d(:,:,jpk) = 0. ; CALL iom_put("LGWCOLL", zlcoll3d(:,:,:) * 1e9 * tmask(:,:,:) * zrfact2 ) |
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| 217 | ENDIF |
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[12377] | 218 | ENDIF |
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[3443] | 219 | ENDIF |
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| 220 | |
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[12377] | 221 | IF(sn_cfctl%l_prttrc) THEN ! print mean trends (used for debugging) |
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[3449] | 222 | WRITE(charout, FMT="('fechem')") |
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[3443] | 223 | CALL prt_ctl_trc_info(charout) |
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[12377] | 224 | CALL prt_ctl_trc(tab4d=tr(:,:,:,:,Krhs), mask=tmask, clinfo=ctrcnm) |
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[3443] | 225 | ENDIF |
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| 226 | ! |
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[9124] | 227 | IF( ln_timing ) CALL timing_stop('p4z_fechem') |
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[3443] | 228 | ! |
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| 229 | END SUBROUTINE p4z_fechem |
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| 230 | |
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| 231 | |
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| 232 | SUBROUTINE p4z_fechem_init |
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| 233 | !!---------------------------------------------------------------------- |
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| 234 | !! *** ROUTINE p4z_fechem_init *** |
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| 235 | !! |
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| 236 | !! ** Purpose : Initialization of iron chemistry parameters |
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| 237 | !! |
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| 238 | !! ** Method : Read the nampisfer namelist and check the parameters |
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| 239 | !! called at the first timestep |
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| 240 | !! |
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| 241 | !! ** input : Namelist nampisfer |
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| 242 | !! |
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| 243 | !!---------------------------------------------------------------------- |
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[9124] | 244 | INTEGER :: ios ! Local integer |
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| 245 | !! |
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[10401] | 246 | NAMELIST/nampisfer/ ln_ligvar, xlam1, xlamdust, ligand, kfep |
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[9124] | 247 | !!---------------------------------------------------------------------- |
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[9169] | 248 | ! |
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| 249 | IF(lwp) THEN |
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| 250 | WRITE(numout,*) |
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| 251 | WRITE(numout,*) 'p4z_rem_init : Initialization of iron chemistry parameters' |
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| 252 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 253 | ENDIF |
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| 254 | ! |
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[4147] | 255 | READ ( numnatp_ref, nampisfer, IOSTAT = ios, ERR = 901) |
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[11536] | 256 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nampisfer in reference namelist' ) |
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[4147] | 257 | READ ( numnatp_cfg, nampisfer, IOSTAT = ios, ERR = 902 ) |
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[11536] | 258 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'nampisfer in configuration namelist' ) |
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[9169] | 259 | IF(lwm) WRITE( numonp, nampisfer ) |
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[4147] | 260 | |
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[9169] | 261 | IF(lwp) THEN ! control print |
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| 262 | WRITE(numout,*) ' Namelist : nampisfer' |
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| 263 | WRITE(numout,*) ' variable concentration of ligand ln_ligvar =', ln_ligvar |
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| 264 | WRITE(numout,*) ' scavenging rate of Iron xlam1 =', xlam1 |
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| 265 | WRITE(numout,*) ' scavenging rate of Iron by dust xlamdust =', xlamdust |
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| 266 | WRITE(numout,*) ' ligand concentration in the ocean ligand =', ligand |
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| 267 | WRITE(numout,*) ' rate constant for nanoparticle formation kfep =', kfep |
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[3443] | 268 | ENDIF |
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[10362] | 269 | ! |
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[3443] | 270 | END SUBROUTINE p4z_fechem_init |
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[9124] | 271 | |
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[3443] | 272 | !!====================================================================== |
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| 273 | END MODULE p4zfechem |
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