[3] | 1 | MODULE trasbc |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE trasbc *** |
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| 4 | !! Ocean active tracers: surface boundary condition |
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| 5 | !!============================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! tra_sbc : update the tracer trend at ocean surface |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! * Modules used |
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| 11 | USE oce ! ocean dynamics and active tracers |
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| 12 | USE dom_oce ! ocean space domain variables |
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| 13 | USE ocesbc ! surface thermohaline fluxes |
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| 14 | USE phycst ! physical constant |
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[216] | 15 | USE traqsr ! solar radiation penetration |
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| 16 | USE trdmod ! ocean trends |
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| 17 | USE trdmod_oce ! ocean variables trends |
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[3] | 18 | USE in_out_manager ! I/O manager |
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[258] | 19 | USE prtctl ! Print control |
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[3] | 20 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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| 24 | !! * Routine accessibility |
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| 25 | PUBLIC tra_sbc ! routine called by step.F90 |
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| 26 | |
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| 27 | !! * Substitutions |
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| 28 | # include "domzgr_substitute.h90" |
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| 29 | # include "vectopt_loop_substitute.h90" |
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| 30 | !!---------------------------------------------------------------------- |
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[247] | 31 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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| 32 | !! $Header$ |
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| 33 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 34 | !!---------------------------------------------------------------------- |
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| 35 | |
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| 36 | CONTAINS |
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| 37 | |
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| 38 | SUBROUTINE tra_sbc ( kt ) |
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| 39 | !!---------------------------------------------------------------------- |
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| 40 | !! *** ROUTINE tra_sbc *** |
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| 41 | !! |
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| 42 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
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| 43 | !! (flux through the interface, concentration/dilution effect) |
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| 44 | !! and add it to the general trend of tracer equations. |
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| 45 | !! |
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| 46 | !! ** Method : |
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| 47 | !! * flux through the air-sea interface: |
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| 48 | !! - temperature : heat flux q (w/m2). If penetrative solar |
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| 49 | !! radiation q is only the non solar part of the heat flux, the |
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| 50 | !! solar part is added in traqsr.F routine. |
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| 51 | !! ta = ta + q /(rau0 rcp e3t) for k=1 |
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| 52 | !! - salinity : no salt flux |
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| 53 | !! * concentration/dilution effect: |
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| 54 | !! The surface freshwater flux modify the ocean volume |
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| 55 | !! and thus the concentration of a tracer and the temperature. |
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| 56 | !! First order of the effect of surface freshwater exchange |
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| 57 | !! for salinity, it can be neglected on temperature (especially |
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| 58 | !! as the temparature of precipitations and runoffs is usually |
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| 59 | !! unknown. |
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| 60 | !! - temperature : we assume that the temperature of both |
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| 61 | !! precipitations and runoffs is equal to the SST, thus there |
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| 62 | !! is no additional flux since in this case, the concentration |
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| 63 | !! dilution effect is balanced by the net heat flux associated |
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| 64 | !! to the freshwater exchange: |
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| 65 | !! (Tp P - Te E) + STT (P-E) = 0 when Tp=Te=SST |
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| 66 | !! - salinity : evaporation, precipitation and runoff |
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| 67 | !! water has a zero salinity, thus |
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| 68 | !! sa = sa + emp * sn / e3t for k=1 |
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| 69 | !! where emp, the surface freshwater budget (evaporation minus |
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| 70 | !! precipitation minus runoff) given in kg/m2/s is divided |
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| 71 | !! by 1000 kg/m3 (density of plain water) to obtain m/s. |
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| 72 | !! |
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| 73 | !! ** Action : - Update the 1st level of (ta,sa) with the trend associated |
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| 74 | !! with the tracer surface boundary condition |
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| 75 | !! - save the trend it in ttrd ('key_trdtra') |
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| 76 | !! |
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| 77 | !! History : |
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| 78 | !! 8.2 ! 98-10 (G. Madec, G. Roullet, M. Imbard) Original code |
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| 79 | !! 8.2 ! 01-02 (D. Ludicone) sea ice and free surface |
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| 80 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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[216] | 81 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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[3] | 82 | !!---------------------------------------------------------------------- |
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[216] | 83 | !! * Modules used |
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| 84 | USE oce, ONLY : ztdta => ua, & ! use ua as 3D workspace |
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| 85 | ztdsa => va ! use va as 3D workspace |
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| 86 | |
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[3] | 87 | !! * Arguments |
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| 88 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 89 | |
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| 90 | !! * Local declarations |
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| 91 | INTEGER :: ji, jj ! dummy loop indices |
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| 92 | REAL(wp) :: zta, zsa, zsrau, zse3t ! temporary scalars |
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| 93 | !!---------------------------------------------------------------------- |
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| 94 | |
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| 95 | IF( kt == nit000 ) THEN |
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| 96 | IF(lwp) WRITE(numout,*) |
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| 97 | IF(lwp) WRITE(numout,*) 'tra_sbc : TRAcer Surface Boundary Condition' |
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| 98 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 99 | ENDIF |
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| 100 | |
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| 101 | ! 0. initialization |
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| 102 | zsrau = 1. / rauw |
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| 103 | #if ! defined key_s_coord |
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| 104 | zse3t = 1. / fse3t(1,1,1) |
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| 105 | #endif |
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| 106 | |
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[216] | 107 | ! Save ta and sa trends |
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| 108 | IF( l_trdtra ) THEN |
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| 109 | ztdta(:,:,:) = ta(:,:,:) |
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| 110 | ztdsa(:,:,:) = sa(:,:,:) |
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| 111 | ENDIF |
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| 112 | |
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[3] | 113 | IF( .NOT.ln_traqsr ) qsr(:,:) = 0.e0 ! no solar radiation penetration |
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| 114 | |
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| 115 | ! 1. Concentration dillution effect on (t,s) |
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| 116 | DO jj = 2, jpj |
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| 117 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 118 | #if defined key_s_coord |
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| 119 | zse3t = 1. / fse3t(ji,jj,1) |
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| 120 | #endif |
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| 121 | ! temperature : heat flux |
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| 122 | zta = ro0cpr * ( qt(ji,jj) - qsr(ji,jj) ) * zse3t |
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| 123 | |
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| 124 | ! salinity : concent./dilut. effect |
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| 125 | zsa = emps(ji,jj) * zsrau * sn(ji,jj,1) * zse3t |
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| 126 | |
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| 127 | ! add the trend to the general tracer trend |
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| 128 | ta(ji,jj,1) = ta(ji,jj,1) + zta |
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| 129 | sa(ji,jj,1) = sa(ji,jj,1) + zsa |
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| 130 | END DO |
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| 131 | END DO |
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[216] | 132 | |
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| 133 | ! save the trends for diagnostic |
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| 134 | ! sea surface boundary condition tracers trends |
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| 135 | IF( l_trdtra ) THEN |
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| 136 | ztdta(:,:,:) = ta(:,:,:) - ztdta(:,:,:) |
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| 137 | ztdsa(:,:,:) = sa(:,:,:) - ztdsa(:,:,:) |
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| 138 | CALL trd_mod(ztdta, ztdsa, jpttdnsr, 'TRA', kt) |
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| 139 | ENDIF |
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[3] | 140 | |
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[258] | 141 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 142 | CALL prt_ctl(tab3d_1=ta, clinfo1=' sbc - Ta: ', mask1=tmask, & |
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| 143 | & tab3d_2=sa, clinfo2=' Sa: ', mask2=tmask, clinfo3='tra') |
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[3] | 144 | ENDIF |
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| 145 | |
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| 146 | END SUBROUTINE tra_sbc |
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| 147 | |
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| 148 | !!====================================================================== |
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| 149 | END MODULE trasbc |
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