| 1 | MODULE trcsbc |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE trcsbc *** |
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| 4 | !! Ocean passive tracers: surface boundary condition |
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| 5 | !!============================================================================== |
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| 6 | #if defined key_top |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! 'key_top' TOP models |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! trc_sbc : update the tracer trend at ocean surface |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | !! * Modules used |
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| 13 | USE oce_trc ! ocean dynamics and active tracers variables |
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| 14 | USE trc ! ocean passive tracers variables |
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| 15 | USE prtctl_trc ! Print control for debbuging |
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| 16 | |
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| 17 | |
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| 18 | IMPLICIT NONE |
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| 19 | PRIVATE |
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| 20 | |
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| 21 | !! * Routine accessibility |
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| 22 | PUBLIC trc_sbc ! routine called by step.F90 |
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| 23 | |
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| 24 | !! * Substitutions |
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| 25 | # include "top_substitute.h90" |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | !! TOP 1.0 , LOCEAN-IPSL (2005) |
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| 28 | !! $Header: /home/opalod/NEMOCVSROOT/NEMO/TOP_SRC/TRP/trcsbc.F90,v 1.10 2007/10/12 09:26:30 opalod Exp $ |
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| 29 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | |
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| 32 | CONTAINS |
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| 33 | |
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| 34 | SUBROUTINE trc_sbc ( kt ) |
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| 35 | !!---------------------------------------------------------------------- |
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| 36 | !! *** ROUTINE trc_sbc *** |
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| 37 | !! |
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| 38 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
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| 39 | !! (concentration/dilution effect) and add it to the general |
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| 40 | !! trend of tracer equations. |
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| 41 | !! |
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| 42 | !! ** Method : |
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| 43 | !! * concentration/dilution effect: |
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| 44 | !! The surface freshwater flux modify the ocean volume |
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| 45 | !! and thus the concentration of a tracer as : |
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| 46 | !! tra = tra + emp * trn / e3t for k=1 |
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| 47 | !! where emp, the surface freshwater budget (evaporation minus |
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| 48 | !! precipitation minus runoff) given in kg/m2/s is divided |
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| 49 | !! by 1000 kg/m3 (density of plain water) to obtain m/s. |
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| 50 | !! |
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| 51 | !! ** Action : - Update the 1st level of tra with the trend associated |
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| 52 | !! with the tracer surface boundary condition |
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| 53 | !! |
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| 54 | !! History : |
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| 55 | !! 8.2 ! 98-10 (G. Madec, G. Roullet, M. Imbard) Original code |
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| 56 | !! 8.2 ! 01-02 (D. Ludicone) sea ice and free surface |
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| 57 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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| 58 | !! 9.0 ! 04-03 (C. Ethe) adapted for passive tracers |
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| 59 | !!---------------------------------------------------------------------- |
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| 60 | !! * Arguments |
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| 61 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 62 | |
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| 63 | !! * Local declarations |
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| 64 | INTEGER :: ji, jj, jn ! dummy loop indices |
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| 65 | REAL(wp) :: ztra, zsrau, zse3t ! temporary scalars |
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| 66 | CHARACTER (len=22) :: charout |
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| 67 | !!---------------------------------------------------------------------- |
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| 68 | |
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| 69 | IF( kt == nittrc000 ) THEN |
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| 70 | IF(lwp) WRITE(numout,*) |
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| 71 | IF(lwp) WRITE(numout,*) 'trc_sbc : Passive tracers surface boundary condition' |
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| 72 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 73 | ENDIF |
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| 74 | |
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| 75 | ! 0. initialization |
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| 76 | zsrau = 1. / rauw |
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| 77 | IF( .NOT. ln_sco ) zse3t = 1. / fse3t(1,1,1) |
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| 78 | #if defined key_trc_diatrd |
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| 79 | DO jn = 1, jptra |
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| 80 | IF (luttrd(jn)) trtrd(:,:,:,ikeep(jn),jpdiatrc) = 0.0 |
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| 81 | END DO |
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| 82 | #endif |
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| 83 | |
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| 84 | DO jn = 1, jptra |
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| 85 | ! 1. Concentration dillution effect on tra |
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| 86 | DO jj = 2, jpj |
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| 87 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 88 | IF( ln_sco ) zse3t = 1. / fse3t(ji,jj,1) |
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| 89 | ! concent./dilut. effect |
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| 90 | ztra = emps(ji,jj) * zsrau * trn(ji,jj,1,jn) * zse3t * tmask(ji,jj,1) |
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| 91 | |
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| 92 | ! add the trend to the general tracer trend |
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| 93 | tra(ji,jj,1,jn) = tra(ji,jj,1,jn) + ztra |
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| 94 | #if defined key_trc_diatrd |
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| 95 | IF (luttrd(jn)) trtrd(ji,jj,1,ikeep(jn),jpdiatrc) = trtrd(ji,jj,1,jn,jpdiatrc) + ztra |
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| 96 | #endif |
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| 97 | END DO |
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| 98 | END DO |
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| 99 | |
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| 100 | END DO |
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| 101 | |
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| 102 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 103 | WRITE(charout, FMT="('sbc')") |
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| 104 | CALL prt_ctl_trc_info(charout) |
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| 105 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm,clinfo2='trd') |
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| 106 | ENDIF |
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| 107 | |
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| 108 | END SUBROUTINE trc_sbc |
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| 109 | |
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| 110 | #else |
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| 111 | !!---------------------------------------------------------------------- |
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| 112 | !! Dummy module : NO passive tracer |
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| 113 | !!---------------------------------------------------------------------- |
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| 114 | CONTAINS |
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| 115 | SUBROUTINE trc_sbc (kt) ! Empty routine |
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| 116 | INTEGER, INTENT(in) :: kt |
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| 117 | WRITE(*,*) 'trc_sbc: You should not have seen this print! error?', kt |
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| 118 | END SUBROUTINE trc_sbc |
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| 119 | #endif |
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| 120 | |
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| 121 | !!====================================================================== |
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| 122 | END MODULE trcsbc |
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