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_passivetrc |
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7 | !!---------------------------------------------------------------------- |
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8 | !! trc_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_trc ! ocean dynamics and active tracers variables |
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12 | USE trc ! ocean passive tracers variables |
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13 | USE prtctl_trc ! Print control for debbuging |
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14 | |
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15 | |
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16 | IMPLICIT NONE |
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17 | PRIVATE |
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18 | |
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19 | !! * Routine accessibility |
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20 | PUBLIC trc_sbc ! routine called by step.F90 |
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21 | |
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22 | !! * Substitutions |
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23 | # include "passivetrc_substitute.h90" |
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24 | !!---------------------------------------------------------------------- |
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25 | !! OPA 9.0 , LODYC-IPSL (2003) |
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26 | !!---------------------------------------------------------------------- |
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27 | |
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28 | CONTAINS |
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29 | |
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30 | SUBROUTINE trc_sbc ( kt ) |
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31 | !!---------------------------------------------------------------------- |
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32 | !! *** ROUTINE trc_sbc *** |
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33 | !! |
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34 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
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35 | !! (concentration/dilution effect) and add it to the general |
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36 | !! trend of tracer equations. |
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37 | !! |
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38 | !! ** Method : |
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39 | !! * concentration/dilution effect: |
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40 | !! The surface freshwater flux modify the ocean volume |
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41 | !! and thus the concentration of a tracer as : |
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42 | !! tra = tra + emp * trn / e3t for k=1 |
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43 | !! where emp, the surface freshwater budget (evaporation minus |
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44 | !! precipitation minus runoff) given in kg/m2/s is divided |
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45 | !! by 1000 kg/m3 (density of plain water) to obtain m/s. |
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46 | !! |
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47 | !! ** Action : - Update the 1st level of tra with the trend associated |
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48 | !! with the tracer surface boundary condition |
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49 | !! |
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50 | !! History : |
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51 | !! 8.2 ! 98-10 (G. Madec, G. Roullet, M. Imbard) Original code |
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52 | !! 8.2 ! 01-02 (D. Ludicone) sea ice and free surface |
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53 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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54 | !! 9.0 ! 04-03 (C. Ethe) adapted for passive tracers |
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55 | !!---------------------------------------------------------------------- |
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56 | !! * Arguments |
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57 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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58 | |
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59 | !! * Local declarations |
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60 | INTEGER :: ji, jj, jn ! dummy loop indices |
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61 | REAL(wp) :: ztra, zsrau, zse3t ! temporary scalars |
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62 | CHARACTER (len=22) :: charout |
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63 | !!---------------------------------------------------------------------- |
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64 | |
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65 | IF( kt == nittrc000 ) THEN |
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66 | IF(lwp) WRITE(numout,*) |
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67 | IF(lwp) WRITE(numout,*) 'trc_sbc : Passive tracers surface boundary condition' |
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68 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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69 | ENDIF |
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70 | |
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71 | ! 0. initialization |
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72 | zsrau = 1. / rauw |
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73 | #if ! defined key_s_coord |
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74 | zse3t = 1. / fse3t(1,1,1) |
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75 | #endif |
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76 | |
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77 | DO jn = 1, jptra |
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78 | ! 1. Concentration dillution effect on tra |
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79 | DO jj = 2, jpj |
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80 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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81 | #if defined key_s_coord |
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82 | zse3t = 1. / fse3t(ji,jj,1) |
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83 | #endif |
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84 | ! concent./dilut. effect |
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85 | ztra = emps(ji,jj) * zsrau * trn(ji,jj,1,jn) * zse3t * tmask(ji,jj,1) |
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86 | |
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87 | ! add the trend to the general tracer trend |
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88 | tra(ji,jj,1,jn) = tra(ji,jj,1,jn) + ztra |
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89 | END DO |
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90 | END DO |
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91 | |
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92 | END DO |
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93 | |
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94 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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95 | WRITE(charout, FMT="('sbc')") |
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96 | CALL prt_ctl_trc_info(charout) |
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97 | CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm,clinfo2='trd') |
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98 | ENDIF |
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99 | |
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100 | END SUBROUTINE trc_sbc |
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101 | |
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102 | #else |
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103 | !!---------------------------------------------------------------------- |
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104 | !! Dummy module : NO passive tracer |
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105 | !!---------------------------------------------------------------------- |
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106 | CONTAINS |
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107 | SUBROUTINE trc_sbc (kt) ! Empty routine |
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108 | INTEGER, INTENT(in) :: kt |
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109 | WRITE(*,*) 'trc_sbc: You should not have seen this print! error?', kt |
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110 | END SUBROUTINE trc_sbc |
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111 | #endif |
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112 | |
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113 | !!====================================================================== |
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114 | END MODULE trcsbc |
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