[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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[2819] | 19 | USE oce_trc ! shared variables between ocean and passive tracers |
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| 20 | USE trc ! passive tracers common variables |
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| 21 | USE sms_pisces ! PISCES Source Minus Sink variables |
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| 22 | USE p4zche ! Chemical model |
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| 23 | USE prtctl_trc ! print control for debugging |
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| 24 | USE iom ! I/O manager |
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[1534] | 25 | #if defined key_cpl_carbon_cycle |
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[2819] | 26 | USE sbc_oce, ONLY : atm_co2 ! atmospheric pCO2 |
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[1534] | 27 | #endif |
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[1298] | 28 | |
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[935] | 29 | IMPLICIT NONE |
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| 30 | PRIVATE |
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| 31 | |
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[1073] | 32 | PUBLIC p4z_flx |
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[2528] | 33 | PUBLIC p4z_flx_init |
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[2715] | 34 | PUBLIC p4z_flx_alloc |
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[935] | 35 | |
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[2715] | 36 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: oce_co2 !: ocean carbon flux |
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| 37 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: satmco2 !: atmospheric pco2 |
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[935] | 38 | |
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[2715] | 39 | REAL(wp) :: t_oce_co2_flx !: Total ocean carbon flux |
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| 40 | REAL(wp) :: t_atm_co2_flx !: global mean of atmospheric pco2 |
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| 41 | REAL(wp) :: area !: ocean surface |
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| 42 | REAL(wp) :: atcco2 = 278._wp !: pre-industrial atmospheric [co2] (ppm) |
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| 43 | REAL(wp) :: atcox = 0.20946_wp !: |
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| 44 | REAL(wp) :: xconv = 0.01_wp / 3600._wp !: coefficients for conversion |
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| 45 | |
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[935] | 46 | !!* Substitution |
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[1800] | 47 | # include "top_substitute.h90" |
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[935] | 48 | !!---------------------------------------------------------------------- |
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[2528] | 49 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
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[1152] | 50 | !! $Id$ |
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[2715] | 51 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[935] | 52 | !!---------------------------------------------------------------------- |
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| 53 | CONTAINS |
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| 54 | |
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| 55 | SUBROUTINE p4z_flx ( kt ) |
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| 56 | !!--------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE p4z_flx *** |
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| 58 | !! |
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| 59 | !! ** Purpose : CALCULATES GAS EXCHANGE AND CHEMISTRY AT SEA SURFACE |
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| 60 | !! |
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| 61 | !! ** Method : - ??? |
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| 62 | !!--------------------------------------------------------------------- |
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[2715] | 63 | USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released |
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| 64 | USE wrk_nemo, ONLY: zkgco2 => wrk_2d_1 , zkgo2 => wrk_2d_2 , zh2co3 => wrk_2d_3 |
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| 65 | USE wrk_nemo, ONLY: zoflx => wrk_2d_4 , zkg => wrk_2d_5 |
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| 66 | USE wrk_nemo, ONLY: zdpco2 => wrk_2d_6 , zdpo2 => wrk_2d_7 |
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| 67 | ! |
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| 68 | INTEGER, INTENT(in) :: kt ! |
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| 69 | ! |
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[1735] | 70 | INTEGER :: ji, jj, jrorr |
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[1457] | 71 | REAL(wp) :: ztc, ztc2, ztc3, zws, zkgwan |
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[935] | 72 | REAL(wp) :: zfld, zflu, zfld16, zflu16, zfact |
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[1457] | 73 | REAL(wp) :: zph, zah2, zbot, zdic, zalk, zsch_o2, zalka, zsch_co2 |
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[935] | 74 | CHARACTER (len=25) :: charout |
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| 75 | !!--------------------------------------------------------------------- |
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| 76 | |
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[2715] | 77 | IF( wrk_in_use(2, 1,2,3,4,5,6,7) ) THEN |
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| 78 | CALL ctl_stop('p4z_flx: requested workspace arrays unavailable') ; RETURN |
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| 79 | ENDIF |
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| 80 | |
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[935] | 81 | ! SURFACE CHEMISTRY (PCO2 AND [H+] IN |
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| 82 | ! SURFACE LAYER); THE RESULT OF THIS CALCULATION |
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| 83 | ! IS USED TO COMPUTE AIR-SEA FLUX OF CO2 |
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| 84 | |
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[2528] | 85 | #if defined key_cpl_carbon_cycle |
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| 86 | satmco2(:,:) = atm_co2(:,:) |
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| 87 | #endif |
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| 88 | |
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[935] | 89 | DO jrorr = 1, 10 |
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| 90 | |
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| 91 | !CDIR NOVERRCHK |
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| 92 | DO jj = 1, jpj |
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| 93 | !CDIR NOVERRCHK |
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| 94 | DO ji = 1, jpi |
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| 95 | |
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| 96 | ! DUMMY VARIABLES FOR DIC, H+, AND BORATE |
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| 97 | zbot = borat(ji,jj,1) |
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| 98 | zfact = rhop(ji,jj,1) / 1000. + rtrn |
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| 99 | zdic = trn(ji,jj,1,jpdic) / zfact |
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| 100 | zph = MAX( hi(ji,jj,1), 1.e-10 ) / zfact |
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| 101 | zalka = trn(ji,jj,1,jptal) / zfact |
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| 102 | |
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| 103 | ! CALCULATE [ALK]([CO3--], [HCO3-]) |
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| 104 | zalk = zalka - ( akw3(ji,jj,1) / zph - zph + zbot / ( 1.+ zph / akb3(ji,jj,1) ) ) |
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| 105 | |
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| 106 | ! CALCULATE [H+] AND [H2CO3] |
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| 107 | zah2 = SQRT( (zdic-zalk)**2 + 4.* ( zalk * ak23(ji,jj,1) & |
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| 108 | & / ak13(ji,jj,1) ) * ( 2.* zdic - zalk ) ) |
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| 109 | zah2 = 0.5 * ak13(ji,jj,1) / zalk * ( ( zdic - zalk ) + zah2 ) |
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| 110 | zh2co3(ji,jj) = ( 2.* zdic - zalk ) / ( 2.+ ak13(ji,jj,1) / zah2 ) * zfact |
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| 111 | hi(ji,jj,1) = zah2 * zfact |
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| 112 | END DO |
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| 113 | END DO |
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| 114 | END DO |
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| 115 | |
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| 116 | |
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| 117 | ! -------------- |
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| 118 | ! COMPUTE FLUXES |
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| 119 | ! -------------- |
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| 120 | |
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| 121 | ! FIRST COMPUTE GAS EXCHANGE COEFFICIENTS |
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| 122 | ! ------------------------------------------- |
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| 123 | |
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| 124 | !CDIR NOVERRCHK |
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| 125 | DO jj = 1, jpj |
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| 126 | !CDIR NOVERRCHK |
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| 127 | DO ji = 1, jpi |
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[2528] | 128 | ztc = MIN( 35., tsn(ji,jj,1,jp_tem) ) |
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[1457] | 129 | ztc2 = ztc * ztc |
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| 130 | ztc3 = ztc * ztc2 |
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| 131 | ! Compute the schmidt Number both O2 and CO2 |
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| 132 | zsch_co2 = 2073.1 - 125.62 * ztc + 3.6276 * ztc2 - 0.043126 * ztc3 |
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| 133 | zsch_o2 = 1953.4 - 128.0 * ztc + 3.9918 * ztc2 - 0.050091 * ztc3 |
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[1007] | 134 | ! wind speed |
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[1457] | 135 | zws = wndm(ji,jj) * wndm(ji,jj) |
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| 136 | ! Compute the piston velocity for O2 and CO2 |
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| 137 | zkgwan = 0.3 * zws + 2.5 * ( 0.5246 + 0.016256 * ztc + 0.00049946 * ztc2 ) |
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[2819] | 138 | zkgwan = zkgwan * xconv * ( 1.- fr_i(ji,jj) ) * tmask(ji,jj,1) |
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[2528] | 139 | # if defined key_degrad |
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[2819] | 140 | zkgwan = zkgwan * facvol(ji,jj,1) |
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[1457] | 141 | #endif |
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| 142 | ! compute gas exchange for CO2 and O2 |
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| 143 | zkgco2(ji,jj) = zkgwan * SQRT( 660./ zsch_co2 ) |
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| 144 | zkgo2 (ji,jj) = zkgwan * SQRT( 660./ zsch_o2 ) |
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[935] | 145 | END DO |
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| 146 | END DO |
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| 147 | |
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| 148 | DO jj = 1, jpj |
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| 149 | DO ji = 1, jpi |
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| 150 | ! Compute CO2 flux for the sea and air |
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[2528] | 151 | zfld = satmco2(ji,jj) * tmask(ji,jj,1) * chemc(ji,jj,1) * zkgco2(ji,jj) |
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[935] | 152 | zflu = zh2co3(ji,jj) * tmask(ji,jj,1) * zkgco2(ji,jj) |
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[2715] | 153 | oce_co2(ji,jj) = ( zfld - zflu ) * rfact * e1e2t(ji,jj) * tmask(ji,jj,1) * 1000. |
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[2528] | 154 | ! compute the trend |
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[1534] | 155 | tra(ji,jj,1,jpdic) = tra(ji,jj,1,jpdic) + ( zfld - zflu ) / fse3t(ji,jj,1) |
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[935] | 156 | |
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| 157 | ! Compute O2 flux |
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[1678] | 158 | zfld16 = atcox * chemc(ji,jj,2) * tmask(ji,jj,1) * zkgo2(ji,jj) |
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[935] | 159 | zflu16 = trn(ji,jj,1,jpoxy) * tmask(ji,jj,1) * zkgo2(ji,jj) |
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| 160 | tra(ji,jj,1,jpoxy) = tra(ji,jj,1,jpoxy) + ( zfld16 - zflu16 ) / fse3t(ji,jj,1) |
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[2819] | 161 | #if defined key_iomput |
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| 162 | zoflx(ji,jj) = ( zfld16 - zflu16 ) * 1000. * tmask(ji,jj,1) |
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| 163 | zkg (ji,jj) = zkgco2(ji,jj) * tmask(ji,jj,1) |
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| 164 | zdpco2(ji,jj) = ( satmco2(ji,jj) - zh2co3(ji,jj) / ( chemc(ji,jj,1) + rtrn ) ) * tmask(ji,jj,1) |
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| 165 | zdpo2 (ji,jj) = ( atcox - trn(ji,jj,1,jpoxy) / ( chemc(ji,jj,2) + rtrn ) ) * tmask(ji,jj,1) |
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| 166 | # else |
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[2715] | 167 | zfact = 1. / e1e2t(ji,jj) / rfact |
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[2528] | 168 | trc2d(ji,jj,jp_pcs0_2d ) = oce_co2(ji,jj) * zfact |
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[1329] | 169 | trc2d(ji,jj,jp_pcs0_2d + 1) = ( zfld16 - zflu16 ) * 1000. * tmask(ji,jj,1) |
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| 170 | trc2d(ji,jj,jp_pcs0_2d + 2) = zkgco2(ji,jj) * tmask(ji,jj,1) |
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[2819] | 171 | trc2d(ji,jj,jp_pcs0_2d + 3) = ( satmco2(ji,jj) - zh2co3(ji,jj) / ( chemc(ji,jj,1) + rtrn ) ) * tmask(ji,jj,1) |
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| 172 | # endif |
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[1457] | 173 | END DO |
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| 174 | END DO |
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| 175 | |
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[2819] | 176 | t_oce_co2_flx = t_oce_co2_flx + glob_sum( oce_co2(:,:) ) ! Cumulative Total Flux of Carbon |
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[2528] | 177 | IF( kt == nitend ) THEN |
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[2715] | 178 | t_atm_co2_flx = glob_sum( satmco2(:,:) * e1e2t(:,:) ) ! Total atmospheric pCO2 |
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[2528] | 179 | ! |
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[2819] | 180 | t_oce_co2_flx = (-1.) * t_oce_co2_flx * 12. / 1.e15 ! Conversion in PgC ; negative for out of the ocean |
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| 181 | t_atm_co2_flx = t_atm_co2_flx / area ! global mean of atmospheric pCO2 |
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[2528] | 182 | ! |
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| 183 | IF( lwp) THEN |
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| 184 | WRITE(numout,*) |
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| 185 | WRITE(numout,*) ' Global mean of atmospheric pCO2 (ppm) at it= ', kt, ' date= ', ndastp |
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| 186 | WRITE(numout,*) '------------------------------------------------------- : ',t_atm_co2_flx |
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| 187 | WRITE(numout,*) |
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| 188 | WRITE(numout,*) ' Cumulative total Flux of Carbon out of the ocean (PgC) :' |
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| 189 | WRITE(numout,*) '------------------------------------------------------- ',t_oce_co2_flx |
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| 190 | ENDIF |
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| 191 | ! |
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[935] | 192 | ENDIF |
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| 193 | |
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| 194 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 195 | WRITE(charout, FMT="('flx ')") |
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| 196 | CALL prt_ctl_trc_info(charout) |
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| 197 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm) |
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| 198 | ENDIF |
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| 199 | |
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[2819] | 200 | IF( ln_diatrc ) THEN |
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| 201 | CALL iom_put( "Cflx" , oce_co2(:,:) / e1e2t(:,:) / rfact ) |
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| 202 | CALL iom_put( "Oflx" , zoflx ) |
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| 203 | CALL iom_put( "Kg" , zkg ) |
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| 204 | CALL iom_put( "Dpco2", zdpco2 ) |
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| 205 | CALL iom_put( "Dpo2" , zdpo2 ) |
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| 206 | ENDIF |
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[2715] | 207 | ! |
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| 208 | IF( wrk_not_released(2, 1,2,3,4,5,6,7) ) CALL ctl_stop('p4z_flx: failed to release workspace arrays') |
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| 209 | ! |
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[935] | 210 | END SUBROUTINE p4z_flx |
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| 211 | |
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[2715] | 212 | |
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[935] | 213 | SUBROUTINE p4z_flx_init |
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| 214 | !!---------------------------------------------------------------------- |
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| 215 | !! *** ROUTINE p4z_flx_init *** |
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| 216 | !! |
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| 217 | !! ** Purpose : Initialization of atmospheric conditions |
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| 218 | !! |
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[1119] | 219 | !! ** Method : Read the nampisext namelist and check the parameters |
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[2528] | 220 | !! called at the first timestep (nit000) |
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[1119] | 221 | !! ** input : Namelist nampisext |
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[935] | 222 | !!---------------------------------------------------------------------- |
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[1119] | 223 | NAMELIST/nampisext/ atcco2 |
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[2715] | 224 | !!---------------------------------------------------------------------- |
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| 225 | ! |
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[2819] | 226 | REWIND( numnatp ) ! read numnatp |
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| 227 | READ ( numnatp, nampisext ) |
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[2715] | 228 | ! |
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[935] | 229 | IF(lwp) THEN ! control print |
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| 230 | WRITE(numout,*) ' ' |
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[1119] | 231 | WRITE(numout,*) ' Namelist parameters for air-sea exchange, nampisext' |
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[935] | 232 | WRITE(numout,*) ' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~' |
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| 233 | WRITE(numout,*) ' Atmospheric pCO2 atcco2 =', atcco2 |
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| 234 | ENDIF |
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[2715] | 235 | ! |
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| 236 | area = glob_sum( e1e2t(:,:) ) ! interior global domain surface |
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| 237 | ! |
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| 238 | oce_co2(:,:) = 0._wp ! Initialization of Flux of Carbon |
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[2528] | 239 | t_atm_co2_flx = 0._wp |
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[2715] | 240 | ! |
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| 241 | satmco2(:,:) = atcco2 ! Initialisation of atmospheric pco2 |
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[2528] | 242 | t_oce_co2_flx = 0._wp |
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[2715] | 243 | ! |
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[935] | 244 | END SUBROUTINE p4z_flx_init |
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| 245 | |
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[2715] | 246 | |
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| 247 | INTEGER FUNCTION p4z_flx_alloc() |
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| 248 | !!---------------------------------------------------------------------- |
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| 249 | !! *** ROUTINE p4z_flx_alloc *** |
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| 250 | !!---------------------------------------------------------------------- |
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| 251 | ALLOCATE( oce_co2(jpi,jpj), satmco2(jpi,jpj), STAT=p4z_flx_alloc ) |
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| 252 | ! |
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| 253 | IF( p4z_flx_alloc /= 0 ) CALL ctl_warn('p4z_flx_alloc : failed to allocate arrays') |
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| 254 | ! |
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| 255 | END FUNCTION p4z_flx_alloc |
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| 256 | |
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[935] | 257 | #else |
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| 258 | !!====================================================================== |
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| 259 | !! Dummy module : No PISCES bio-model |
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| 260 | !!====================================================================== |
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| 261 | CONTAINS |
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| 262 | SUBROUTINE p4z_flx( kt ) ! Empty routine |
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| 263 | INTEGER, INTENT( in ) :: kt |
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| 264 | WRITE(*,*) 'p4z_flx: You should not have seen this print! error?', kt |
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| 265 | END SUBROUTINE p4z_flx |
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| 266 | #endif |
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| 267 | |
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| 268 | !!====================================================================== |
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| 269 | END MODULE p4zflx |
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