| 1 | MODULE trcsms_cfc |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trcsms_cfc *** |
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| 4 | !! TOP : CFC main model |
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| 5 | !!====================================================================== |
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| 6 | !! History : - ! 1999-10 (JC. Dutay) original code |
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| 7 | !! 1.0 ! 2004-03 (C. Ethe) free form + modularity |
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| 8 | !! 2.0 ! 2007-12 (C. Ethe, G. Madec) reorganisation |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | #if defined key_cfc |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | !! 'key_cfc' CFC tracers |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! trc_sms_cfc : compute and add CFC suface forcing to CFC trends |
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| 15 | !! trc_cfc_cst : sets constants for CFC surface forcing computation |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE daymod ! calendar |
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| 18 | USE oce_trc ! Ocean variables |
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| 19 | USE par_trc ! TOP parameters |
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| 20 | USE trc ! TOP variables |
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| 21 | USE trdmld_trc_oce |
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| 22 | USE trdmld_trc |
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| 23 | |
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| 24 | IMPLICIT NONE |
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| 25 | PRIVATE |
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| 26 | |
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| 27 | PUBLIC trc_sms_cfc ! called in ??? |
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| 28 | |
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| 29 | INTEGER , PUBLIC, PARAMETER :: jpyear = 100 ! temporal parameter |
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| 30 | INTEGER , PUBLIC, PARAMETER :: jphem = 2 ! parameter for the 2 hemispheres |
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| 31 | INTEGER , PUBLIC :: ndate_beg ! initial calendar date (aammjj) for CFC |
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| 32 | INTEGER , PUBLIC :: nyear_res ! restoring time constant (year) |
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| 33 | INTEGER , PUBLIC :: nyear_beg ! initial year (aa) |
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| 34 | |
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| 35 | REAL(wp), PUBLIC, DIMENSION(jpyear,jphem, jp_cfc) :: p_cfc ! partial hemispheric pressure for CFC |
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| 36 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj) :: xphem ! spatial interpolation factor for patm |
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| 37 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj ,jp_cfc) :: qtr_cfc ! flux at surface |
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| 38 | REAL(wp), PUBLIC, DIMENSION(jpi,jpj ,jp_cfc) :: qint_cfc ! cumulative flux |
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| 39 | |
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| 40 | REAL(wp), DIMENSION(4,jp_cfc) :: soa ! coefficient for solubility of CFC [mol/l/atm] |
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| 41 | REAL(wp), DIMENSION(3,jp_cfc) :: sob ! " " |
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| 42 | REAL(wp), DIMENSION(4,jp_cfc) :: sca ! coefficients for schmidt number in degre Celcius |
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| 43 | |
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| 44 | ! ! coefficients for conversion |
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| 45 | REAL(wp) :: xconv1 = 1.0 ! conversion from to |
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| 46 | REAL(wp) :: xconv2 = 0.01/3600. ! conversion from cm/h to m/s: |
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| 47 | REAL(wp) :: xconv3 = 1.0e+3 ! conversion from mol/l/atm to mol/m3/atm |
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| 48 | REAL(wp) :: xconv4 = 1.0e-12 ! conversion from mol/m3/atm to mol/m3/pptv |
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| 49 | |
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| 50 | !! * Substitutions |
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| 51 | # include "top_substitute.h90" |
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| 52 | !!---------------------------------------------------------------------- |
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| 53 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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| 54 | !! $Id$ |
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| 55 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 56 | !!---------------------------------------------------------------------- |
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| 57 | |
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| 58 | CONTAINS |
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| 59 | |
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| 60 | SUBROUTINE trc_sms_cfc( kt ) |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | !! *** ROUTINE trc_sms_cfc *** |
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| 63 | !! |
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| 64 | !! ** Purpose : Compute the surface boundary contition on CFC 11 |
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| 65 | !! passive tracer associated with air-mer fluxes and add it |
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| 66 | !! to the general trend of tracers equations. |
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| 67 | !! |
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| 68 | !! ** Method : - get the atmospheric partial pressure - given in pico - |
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| 69 | !! - computation of solubility ( in 1.e-12 mol/l then in 1.e-9 mol/m3) |
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| 70 | !! - computation of transfert speed ( given in cm/hour ----> cm/s ) |
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| 71 | !! - the input function is given by : |
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| 72 | !! speed * ( concentration at equilibrium - concentration at surface ) |
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| 73 | !! - the input function is in pico-mol/m3/s and the |
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| 74 | !! CFC concentration in pico-mol/m3 |
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| 75 | !!---------------------------------------------------------------------- |
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| 76 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 77 | !! |
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| 78 | INTEGER :: ji, jj, jn, jl, jm, js |
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| 79 | INTEGER :: iyear_beg, iyear_end |
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| 80 | INTEGER :: im1, im2 |
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| 81 | |
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| 82 | REAL(wp) :: ztap, zdtap |
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| 83 | REAL(wp) :: zt1, zt2, zt3, zv2 |
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| 84 | REAL(wp) :: zsol ! solubility |
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| 85 | REAL(wp) :: zsch ! schmidt number |
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| 86 | REAL(wp) :: zpp_cfc ! atmospheric partial pressure of CFC |
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| 87 | REAL(wp) :: zca_cfc ! concentration at equilibrium |
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| 88 | REAL(wp) :: zak_cfc ! transfert coefficients |
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| 89 | |
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| 90 | REAL(wp), DIMENSION(jphem,jp_cfc) :: zpatm ! atmospheric function |
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| 91 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztrcfc ! use for CFC sms trend |
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| 92 | !!---------------------------------------------------------------------- |
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| 93 | |
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| 94 | IF( kt == nittrc000 ) CALL trc_cfc_cst |
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| 95 | |
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| 96 | ! Temporal interpolation |
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| 97 | ! ---------------------- |
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| 98 | iyear_beg = nyear + ( nyear_res - 1900 - nyear_beg ) |
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| 99 | IF ( nmonth <= 6 ) THEN |
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| 100 | iyear_beg = iyear_beg - 2 + nyear_beg |
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| 101 | im1 = 6 - nmonth + 1 |
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| 102 | im2 = 6 + nmonth - 1 |
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| 103 | ELSE |
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| 104 | iyear_beg = iyear_beg - 1 + nyear_beg |
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| 105 | im1 = 12 - nmonth + 7 |
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| 106 | im2 = nmonth - 7 |
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| 107 | ENDIF |
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| 108 | iyear_end = iyear_beg + 1 |
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| 109 | |
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| 110 | ! !------------! |
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| 111 | DO jl = 1, jp_cfc ! CFC loop ! |
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| 112 | ! !------------! |
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| 113 | jn = jp_cfc0 + jl - 1 |
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| 114 | ! time interpolation at time kt |
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| 115 | DO jm = 1, jphem |
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| 116 | zpatm(jm,jl) = ( p_cfc(iyear_beg, jm, jl) * FLOAT (im1) & |
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| 117 | & + p_cfc(iyear_end, jm, jl) * FLOAT (im2) ) / 12. |
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| 118 | END DO |
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| 119 | |
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| 120 | ! !------------! |
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| 121 | DO jj = 1, jpj ! i-j loop ! |
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| 122 | DO ji = 1, jpi !------------! |
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| 123 | |
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| 124 | ! space interpolation |
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| 125 | zpp_cfc = xphem(ji,jj) * zpatm(1,jl) & |
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| 126 | & + ( 1.- xphem(ji,jj) ) * zpatm(2,jl) |
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| 127 | |
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| 128 | ! Computation of concentration at equilibrium : in picomol/l |
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| 129 | ! coefficient for solubility for CFC-11/12 in mol/l/atm |
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| 130 | IF( tmask(ji,jj,1) .GE. 0.5 ) THEN |
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| 131 | ztap = ( tn(ji,jj,1) + 273.16 ) * 0.01 |
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| 132 | zdtap = sob(1,jl) + ztap * ( sob(2,jl) + ztap * sob(3,jl) ) |
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| 133 | zsol = EXP( soa(1,jl) + soa(2,jl) / ztap + soa(3,jl) * LOG( ztap ) & |
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| 134 | & + soa(4,jl) * ztap * ztap + sn(ji,jj,1) * zdtap ) |
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| 135 | ELSE |
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| 136 | zsol = 0.e0 |
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| 137 | ENDIF |
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| 138 | ! conversion from mol/l/atm to mol/m3/atm and from mol/m3/atm to mol/m3/pptv |
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| 139 | zsol = xconv4 * xconv3 * zsol * tmask(ji,jj,1) |
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| 140 | ! concentration at equilibrium |
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| 141 | zca_cfc = xconv1 * zpp_cfc * zsol * tmask(ji,jj,1) |
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| 142 | |
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| 143 | ! Computation of speed transfert |
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| 144 | ! Schmidt number |
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| 145 | zt1 = tn(ji,jj,1) |
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| 146 | zt2 = zt1 * zt1 |
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| 147 | zt3 = zt1 * zt2 |
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| 148 | zsch = sca(1,jl) + sca(2,jl) * zt1 + sca(3,jl) * zt2 + sca(4,jl) * zt3 |
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| 149 | |
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| 150 | ! speed transfert : formulae of wanninkhof 1992 |
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| 151 | zv2 = wndm(ji,jj) * wndm(ji,jj) |
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| 152 | zsch = zsch / 660. |
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| 153 | zak_cfc = ( 0.39 * xconv2 * zv2 / SQRT(zsch) ) * tmask(ji,jj,1) |
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| 154 | |
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| 155 | ! Input function : speed *( conc. at equil - concen at surface ) |
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| 156 | ! trn in pico-mol/l idem qtr; ak in en m/s |
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| 157 | qtr_cfc(ji,jj,jl) = -zak_cfc * ( trb(ji,jj,1,jn) - zca_cfc ) & |
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| 158 | #if defined key_off_degrad |
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| 159 | & * facvol(ji,jj,1) & |
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| 160 | #endif |
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| 161 | & * tmask(ji,jj,1) * ( 1. - fr_i(ji,jj) ) |
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| 162 | |
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| 163 | ! Add the surface flux to the trend |
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| 164 | tra(ji,jj,1,jn) = tra(ji,jj,1,jn) + qtr_cfc(ji,jj,jl) / fse3t(ji,jj,1) |
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| 165 | |
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| 166 | ! cumulation of surface flux at each time step |
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| 167 | qint_cfc(ji,jj,jl) = qint_cfc(ji,jj,jl) + qtr_cfc(ji,jj,jl) * rdt |
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| 168 | |
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| 169 | # if defined key_trc_diaadd |
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| 170 | ! Save diagnostics , just for CFC11 |
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| 171 | js = 1 |
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| 172 | trc2d(ji,jj,jp_cfc0_2d ) = qtr_cfc (ji,jj,js) |
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| 173 | trc2d(ji,jj,jp_cfc0_2d + 1) = qint_cfc(ji,jj,js) |
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| 174 | # endif |
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| 175 | ! !----------------! |
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| 176 | END DO ! end i-j loop ! |
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| 177 | END DO !----------------! |
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| 178 | ! !----------------! |
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| 179 | END DO ! end CFC loop ! |
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| 180 | ! !----------------! |
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| 181 | |
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| 182 | IF( l_trdtrc ) THEN |
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| 183 | DO jn = jp_cfc0, jp_cfc1 |
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| 184 | ztrcfc(:,:,:) = tra(:,:,:,jn) |
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| 185 | CALL trd_mod_trc( ztrcfc, jn, jptrc_trd_sms, kt ) ! save trends |
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| 186 | END DO |
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| 187 | END IF |
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| 188 | |
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| 189 | END SUBROUTINE trc_sms_cfc |
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| 190 | |
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| 191 | SUBROUTINE trc_cfc_cst |
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| 192 | !!--------------------------------------------------------------------- |
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| 193 | !! *** trc_cfc_cst *** |
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| 194 | !! |
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| 195 | !! ** Purpose : sets constants for CFC model |
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| 196 | !!--------------------------------------------------------------------- |
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| 197 | |
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| 198 | |
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| 199 | ! coefficient for CFC11 |
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| 200 | !---------------------- |
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| 201 | |
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| 202 | ! Solubility |
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| 203 | soa(1,1) = -229.9261 |
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| 204 | soa(2,1) = 319.6552 |
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| 205 | soa(3,1) = 119.4471 |
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| 206 | soa(4,1) = -1.39165 |
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| 207 | |
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| 208 | sob(1,1) = -0.142382 |
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| 209 | sob(2,1) = 0.091459 |
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| 210 | sob(3,1) = -0.0157274 |
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| 211 | |
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| 212 | ! Schmidt number |
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| 213 | sca(1,1) = 3501.8 |
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| 214 | sca(2,1) = -210.31 |
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| 215 | sca(3,1) = 6.1851 |
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| 216 | sca(4,1) = -0.07513 |
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| 217 | |
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| 218 | ! coefficient for CFC12 |
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| 219 | !---------------------- |
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| 220 | |
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| 221 | ! Solubility |
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| 222 | soa(1,2) = -218.0971 |
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| 223 | soa(2,2) = 298.9702 |
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| 224 | soa(3,2) = 113.8049 |
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| 225 | soa(4,2) = -1.39165 |
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| 226 | |
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| 227 | sob(1,2) = -0.143566 |
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| 228 | sob(2,2) = 0.091015 |
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| 229 | sob(3,2) = -0.0153924 |
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| 230 | |
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| 231 | ! schmidt number |
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| 232 | sca(1,2) = 3845.4 |
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| 233 | sca(2,2) = -228.95 |
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| 234 | sca(3,2) = 6.1908 |
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| 235 | sca(4,2) = -0.067430 |
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| 236 | |
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| 237 | END SUBROUTINE trc_cfc_cst |
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| 238 | |
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| 239 | #else |
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| 240 | !!---------------------------------------------------------------------- |
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| 241 | !! Dummy module No CFC tracers |
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| 242 | !!---------------------------------------------------------------------- |
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| 243 | CONTAINS |
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| 244 | SUBROUTINE trc_sms_cfc( kt ) ! Empty routine |
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| 245 | WRITE(*,*) 'trc_sms_cfc: You should not have seen this print! error?', kt |
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| 246 | END SUBROUTINE trc_sms_cfc |
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| 247 | #endif |
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| 248 | |
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| 249 | !!====================================================================== |
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| 250 | END MODULE trcsms_cfc |
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