[935] | 1 | MODULE p4zflx |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE p4zflx *** |
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| 4 | !! TOP : PISCES CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
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| 5 | !!====================================================================== |
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| 6 | !! History : - ! 1988-07 (E. MAIER-REIMER) Original code |
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| 7 | !! - ! 1998 (O. Aumont) additions |
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| 8 | !! - ! 1999 (C. Le Quere) modifications |
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| 9 | !! 1.0 ! 2004 (O. Aumont) modifications |
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| 10 | !! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90 |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | #if defined key_pisces |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! 'key_pisces' PISCES bio-model |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | !! p4z_flx : CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
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| 17 | !! p4z_flx_init : Read the namelist |
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| 18 | !!---------------------------------------------------------------------- |
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| 19 | USE trc |
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| 20 | USE oce_trc ! |
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[1119] | 21 | USE trc |
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[1073] | 22 | USE sms_pisces |
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[935] | 23 | USE prtctl_trc |
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| 24 | USE p4zche |
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| 25 | |
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[1298] | 26 | USE lib_mpp |
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| 27 | |
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[935] | 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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[1073] | 31 | PUBLIC p4z_flx |
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[935] | 32 | |
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| 33 | REAL(wp) :: & ! pre-industrial atmospheric [co2] (ppm) |
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| 34 | atcox = 0.20946 , & !: |
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| 35 | atcco2 = 278. !: |
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| 36 | |
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| 37 | REAL(wp) :: & |
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[1298] | 38 | tco2flx !: Total flux of carbon per year |
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[935] | 39 | |
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| 40 | !!* Substitution |
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| 41 | # include "domzgr_substitute.h90" |
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| 42 | !!---------------------------------------------------------------------- |
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| 43 | !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) |
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[1152] | 44 | !! $Id$ |
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[935] | 45 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 46 | !!---------------------------------------------------------------------- |
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| 47 | |
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| 48 | CONTAINS |
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| 49 | |
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| 50 | SUBROUTINE p4z_flx ( kt ) |
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| 51 | !!--------------------------------------------------------------------- |
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| 52 | !! *** ROUTINE p4z_flx *** |
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| 53 | !! |
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| 54 | !! ** Purpose : CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
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| 55 | !! |
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| 56 | !! ** Method : - ??? |
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| 57 | !!--------------------------------------------------------------------- |
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| 58 | INTEGER, INTENT(in) :: kt |
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| 59 | INTEGER :: ji, jj, jrorr, nspyr |
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[1007] | 60 | REAL(wp) :: zttc, zws, zkgwan |
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[935] | 61 | REAL(wp) :: zfld, zflu, zfld16, zflu16, zfact |
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| 62 | REAL(wp) :: zph, zah2, zbot, zdic, zalk, zschmitto2, zalka, zschmittco2 |
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| 63 | REAL(wp), DIMENSION(jpi,jpj) :: zkgco2, zkgo2, zh2co3, ztco2flx |
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| 64 | CHARACTER (len=25) :: charout |
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| 65 | |
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| 66 | !!--------------------------------------------------------------------- |
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| 67 | |
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| 68 | |
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| 69 | IF( kt == nittrc000 ) CALL p4z_flx_init ! Initialization (first time-step only) |
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| 70 | |
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| 71 | |
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| 72 | ! ----------------------------------------------------- |
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| 73 | ! ASSIGNATION TO EXPONENTS IN THE LISS AND MERLIVAT |
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| 74 | ! FORMULATION OF THE GAS EXCHANGE RATE |
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| 75 | ! ----------------------------------------------------- |
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| 76 | |
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| 77 | nspyr = INT( raass / rdt ) |
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| 78 | |
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| 79 | ! SURFACE CHEMISTRY (PCO2 AND [H+] IN |
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| 80 | ! SURFACE LAYER); THE RESULT OF THIS CALCULATION |
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| 81 | ! IS USED TO COMPUTE AIR-SEA FLUX OF CO2 |
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| 82 | |
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| 83 | DO jrorr = 1, 10 |
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| 84 | |
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| 85 | !CDIR NOVERRCHK |
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| 86 | DO jj = 1, jpj |
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| 87 | !CDIR NOVERRCHK |
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| 88 | DO ji = 1, jpi |
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| 89 | |
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| 90 | ! DUMMY VARIABLES FOR DIC, H+, AND BORATE |
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| 91 | zbot = borat(ji,jj,1) |
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| 92 | zfact = rhop(ji,jj,1) / 1000. + rtrn |
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| 93 | zdic = trn(ji,jj,1,jpdic) / zfact |
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| 94 | zph = MAX( hi(ji,jj,1), 1.e-10 ) / zfact |
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| 95 | zalka = trn(ji,jj,1,jptal) / zfact |
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| 96 | |
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| 97 | ! CALCULATE [ALK]([CO3--], [HCO3-]) |
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| 98 | zalk = zalka - ( akw3(ji,jj,1) / zph - zph + zbot / ( 1.+ zph / akb3(ji,jj,1) ) ) |
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| 99 | |
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| 100 | ! CALCULATE [H+] AND [H2CO3] |
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| 101 | zah2 = SQRT( (zdic-zalk)**2 + 4.* ( zalk * ak23(ji,jj,1) & |
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| 102 | & / ak13(ji,jj,1) ) * ( 2.* zdic - zalk ) ) |
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| 103 | zah2 = 0.5 * ak13(ji,jj,1) / zalk * ( ( zdic - zalk ) + zah2 ) |
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| 104 | zh2co3(ji,jj) = ( 2.* zdic - zalk ) / ( 2.+ ak13(ji,jj,1) / zah2 ) * zfact |
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| 105 | hi(ji,jj,1) = zah2 * zfact |
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| 106 | END DO |
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| 107 | END DO |
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| 108 | END DO |
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| 109 | |
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| 110 | |
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| 111 | ! -------------- |
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| 112 | ! COMPUTE FLUXES |
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| 113 | ! -------------- |
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| 114 | |
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| 115 | ! FIRST COMPUTE GAS EXCHANGE COEFFICIENTS |
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| 116 | ! ------------------------------------------- |
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| 117 | |
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| 118 | !CDIR NOVERRCHK |
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| 119 | DO jj = 1, jpj |
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| 120 | !CDIR NOVERRCHK |
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| 121 | DO ji = 1, jpi |
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| 122 | |
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| 123 | zttc = MIN( 35., tn(ji,jj,1) ) |
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| 124 | |
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| 125 | ! Compute the schmidt Number both O2 and CO2 |
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| 126 | ! ------------------------------------------ |
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| 127 | |
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| 128 | zschmittco2 = 2073.1 - 125.62 * zttc + 3.6276 * zttc**2 - 0.043126 * zttc**3 |
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| 129 | zschmitto2 = 1953.4 - 128.0 * zttc + 3.9918 * zttc**2 - 0.050091 * zttc**3 |
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| 130 | |
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[1007] | 131 | ! wind speed |
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| 132 | zws = wndm(ji,jj) |
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[935] | 133 | |
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| 134 | ! Compute the piston velocity for O2 and CO2 |
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| 135 | ! ------------------------------------------ |
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| 136 | |
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| 137 | zkgwan = ( 0.3 * zws * zws & |
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| 138 | & + 2.5 * ( 0.5246 + zttc * ( 0.016256+zttc*0.00049946 ) ) ) & |
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| 139 | # if defined key_off_degrad |
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| 140 | & * facvol(ji,jj,1) & |
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| 141 | # endif |
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[1035] | 142 | & / (100. * 3600.)* ( 1.- fr_i(ji,jj) ) * tmask(ji,jj,1) |
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[935] | 143 | |
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| 144 | ! COMPUTE GAS EXCHANGE FOR CO2 |
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| 145 | zkgco2(ji,jj) = zkgwan * SQRT( 660./ zschmittco2 ) |
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| 146 | zkgo2(ji,jj) = zkgwan * SQRT( 660./ zschmitto2 ) |
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| 147 | |
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| 148 | END DO |
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| 149 | END DO |
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| 150 | |
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| 151 | ztco2flx(:,:) = 0. |
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| 152 | DO jj = 1, jpj |
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| 153 | DO ji = 1, jpi |
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| 154 | |
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| 155 | ! Compute CO2 flux for the sea and air |
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| 156 | zfld = atcco2 * tmask(ji,jj,1) * chemc(ji,jj,1) * zkgco2(ji,jj) |
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| 157 | zflu = zh2co3(ji,jj) * tmask(ji,jj,1) * zkgco2(ji,jj) |
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| 158 | tra(ji,jj,1,jpdic) = tra(ji,jj,1,jpdic) + ( zfld - zflu ) / fse3t(ji,jj,1) |
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| 159 | |
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| 160 | ! compute flux of carbon |
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| 161 | ztco2flx(ji,jj) = ( zfld - zflu ) * rfact & |
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| 162 | & * e1t(ji,jj) * e2t(ji,jj) * tmask(ji,jj,1) * 1000. |
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| 163 | |
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| 164 | ! Compute O2 flux |
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| 165 | zfld16 = atcox * chemc(ji,jj,2) *tmask(ji,jj,1) * zkgo2(ji,jj) |
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| 166 | zflu16 = trn(ji,jj,1,jpoxy) * tmask(ji,jj,1) * zkgo2(ji,jj) |
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| 167 | tra(ji,jj,1,jpoxy) = tra(ji,jj,1,jpoxy) + ( zfld16 - zflu16 ) / fse3t(ji,jj,1) |
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| 168 | |
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| 169 | # if defined key_trc_diaadd |
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| 170 | ! Save diagnostics |
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[1329] | 171 | trc2d(ji,jj,jp_pcs0_2d ) = ( zfld - zflu ) * 1000. * tmask(ji,jj,1) |
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| 172 | trc2d(ji,jj,jp_pcs0_2d + 1) = ( zfld16 - zflu16 ) * 1000. * tmask(ji,jj,1) |
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| 173 | trc2d(ji,jj,jp_pcs0_2d + 2) = zkgco2(ji,jj) * tmask(ji,jj,1) |
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| 174 | trc2d(ji,jj,jp_pcs0_2d + 3) = atcco2 - zh2co3(ji,jj) / ( chemc(ji,jj,1) + rtrn ) * tmask(ji,jj,1) |
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[935] | 175 | # endif |
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| 176 | END DO |
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| 177 | END DO |
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| 178 | ! |
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| 179 | |
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| 180 | ! Total Flux of Carbon |
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| 181 | DO jj = 1, jpj |
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| 182 | DO ji = 1, jpi |
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| 183 | tco2flx = tco2flx + ztco2flx(ji,jj) * tmask_i(ji,jj) |
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| 184 | END DO |
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| 185 | END DO |
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| 186 | |
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| 187 | IF( MOD( kt, nspyr ) == 0 ) THEN |
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[1298] | 188 | IF( lk_mpp ) CALL mpp_sum( tco2flx ) ! sum over the global domain |
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| 189 | |
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[935] | 190 | WRITE(numout,*) ' Atmospheric pCO2 :' |
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| 191 | WRITE(numout,*) '-------------------- : ',kt,' ',atcco2 |
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| 192 | WRITE(numout,*) '(ppm)' |
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| 193 | WRITE(numout,*) 'Total Flux of Carbon :' |
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[1298] | 194 | WRITE(numout,*) '-------------------- : ',tco2flx * 12. / 1e15 |
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[935] | 195 | WRITE(numout,*) '(GtC/an)' |
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| 196 | tco2flx = 0. |
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| 197 | ENDIF |
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| 198 | |
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| 199 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 200 | WRITE(charout, FMT="('flx ')") |
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| 201 | CALL prt_ctl_trc_info(charout) |
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| 202 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm) |
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| 203 | ENDIF |
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| 204 | |
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| 205 | |
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| 206 | END SUBROUTINE p4z_flx |
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| 207 | |
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| 208 | SUBROUTINE p4z_flx_init |
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| 209 | |
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| 210 | !!---------------------------------------------------------------------- |
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| 211 | !! *** ROUTINE p4z_flx_init *** |
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| 212 | !! |
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| 213 | !! ** Purpose : Initialization of atmospheric conditions |
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| 214 | !! |
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[1119] | 215 | !! ** Method : Read the nampisext namelist and check the parameters |
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[935] | 216 | !! called at the first timestep (nittrc000) |
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[1119] | 217 | !! ** input : Namelist nampisext |
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[935] | 218 | !! |
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| 219 | !!---------------------------------------------------------------------- |
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| 220 | |
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[1119] | 221 | NAMELIST/nampisext/ atcco2 |
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[935] | 222 | |
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| 223 | REWIND( numnat ) ! read numnat |
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[1119] | 224 | READ ( numnat, nampisext ) |
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[935] | 225 | |
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| 226 | IF(lwp) THEN ! control print |
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| 227 | WRITE(numout,*) ' ' |
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[1119] | 228 | WRITE(numout,*) ' Namelist parameters for air-sea exchange, nampisext' |
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[935] | 229 | WRITE(numout,*) ' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~' |
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| 230 | WRITE(numout,*) ' Atmospheric pCO2 atcco2 =', atcco2 |
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| 231 | ENDIF |
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| 232 | |
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[1298] | 233 | ! Initialization of total Flux of Carbon |
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| 234 | tco2flx = 0. |
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| 235 | |
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[935] | 236 | END SUBROUTINE p4z_flx_init |
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| 237 | |
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| 238 | #else |
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| 239 | !!====================================================================== |
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| 240 | !! Dummy module : No PISCES bio-model |
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| 241 | !!====================================================================== |
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| 242 | CONTAINS |
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| 243 | SUBROUTINE p4z_flx( kt ) ! Empty routine |
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| 244 | INTEGER, INTENT( in ) :: kt |
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| 245 | WRITE(*,*) 'p4z_flx: You should not have seen this print! error?', kt |
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| 246 | END SUBROUTINE p4z_flx |
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| 247 | #endif |
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| 248 | |
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| 249 | !!====================================================================== |
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| 250 | END MODULE p4zflx |
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