1 | MODULE dynbfr |
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2 | !!============================================================================== |
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3 | !! *** MODULE dynbfr *** |
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4 | !! Ocean dynamics : bottom friction component of the momentum mixing trend |
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5 | !!============================================================================== |
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6 | !! History : 3.2 ! 2008-11 (A. C. Coward) Original code |
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7 | !! 3.4 ! 2011-09 (H. Liu) Make it consistent with semi-implicit |
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8 | !! Bottom friction (ln_bfrimp = .true.) |
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9 | !!---------------------------------------------------------------------- |
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10 | |
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11 | !!---------------------------------------------------------------------- |
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12 | !! dyn_bfr : Update the momentum trend with the bottom friction contribution |
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13 | !!---------------------------------------------------------------------- |
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14 | USE oce ! ocean dynamics and tracers variables |
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15 | USE dom_oce ! ocean space and time domain variables |
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16 | USE zdf_oce ! ocean vertical physics variables |
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17 | USE zdfbfr ! ocean bottom friction variables |
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18 | USE trd_oce ! trends: ocean variables |
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19 | USE trddyn ! trend manager: dynamics |
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20 | USE in_out_manager ! I/O manager |
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21 | USE prtctl ! Print control |
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22 | USE timing ! Timing |
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23 | USE wrk_nemo ! Memory Allocation |
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24 | |
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25 | IMPLICIT NONE |
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26 | PRIVATE |
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27 | |
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28 | PUBLIC dyn_bfr ! routine called by step.F90 |
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29 | |
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30 | !! * Substitutions |
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31 | # include "domzgr_substitute.h90" |
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32 | # include "zdfddm_substitute.h90" |
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33 | # include "vectopt_loop_substitute.h90" |
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34 | !!---------------------------------------------------------------------- |
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35 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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36 | !! $Id$ |
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37 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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38 | !!---------------------------------------------------------------------- |
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39 | CONTAINS |
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40 | |
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41 | SUBROUTINE dyn_bfr( kt ) |
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42 | !!---------------------------------------------------------------------- |
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43 | !! *** ROUTINE dyn_bfr *** |
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44 | !! |
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45 | !! ** Purpose : compute the bottom friction ocean dynamics physics. |
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46 | !! |
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47 | !! ** Action : (ua,va) momentum trend increased by bottom friction trend |
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48 | !!--------------------------------------------------------------------- |
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49 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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50 | !! |
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51 | INTEGER :: ji, jj ! dummy loop indexes |
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52 | INTEGER :: ikbu, ikbv ! local integers |
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53 | REAL(wp) :: zm1_2dt ! local scalar |
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54 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdu, ztrdv |
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55 | !!--------------------------------------------------------------------- |
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56 | ! |
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57 | IF( nn_timing == 1 ) CALL timing_start('dyn_bfr') |
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58 | ! |
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59 | !!gm issue: better to put the logical in step to control the call of zdf_bfr |
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60 | !! ==> change the logical from ln_bfrimp to ln_bfr_exp !! |
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61 | IF( .NOT.ln_bfrimp) THEN ! only for explicit bottom friction form |
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62 | ! implicit bfr is implemented in dynzdf_imp |
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63 | |
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64 | !!gm bug : time step is only rdt (not 2 rdt if euler start !) |
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65 | zm1_2dt = - 1._wp / ( 2._wp * rdt ) |
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66 | |
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67 | IF( l_trddyn ) THEN ! temporary save of ua and va trends |
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68 | CALL wrk_alloc( jpi,jpj,jpk, ztrdu, ztrdv ) |
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69 | ztrdu(:,:,:) = ua(:,:,:) |
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70 | ztrdv(:,:,:) = va(:,:,:) |
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71 | ENDIF |
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72 | |
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73 | |
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74 | DO jj = 2, jpjm1 |
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75 | DO ji = 2, jpim1 |
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76 | ikbu = mbku(ji,jj) ! deepest ocean u- & v-levels |
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77 | ikbv = mbkv(ji,jj) |
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78 | ! |
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79 | ! Apply stability criteria on absolute value : abs(bfr/e3) < 1/(2dt) => bfr/e3 > -1/(2dt) |
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80 | ua(ji,jj,ikbu) = ua(ji,jj,ikbu) + MAX( bfrua(ji,jj) / fse3u(ji,jj,ikbu) , zm1_2dt ) * ub(ji,jj,ikbu) |
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81 | va(ji,jj,ikbv) = va(ji,jj,ikbv) + MAX( bfrva(ji,jj) / fse3v(ji,jj,ikbv) , zm1_2dt ) * vb(ji,jj,ikbv) |
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82 | |
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83 | ! (ISF) stability criteria for top friction |
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84 | ikbu = miku(ji,jj) ! first wet ocean u- & v-levels |
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85 | ikbv = mikv(ji,jj) |
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86 | ! |
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87 | ! Apply stability criteria on absolute value : abs(bfr/e3) < 1/(2dt) => bfr/e3 > -1/(2dt) |
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88 | ua(ji,jj,ikbu) = ua(ji,jj,ikbu) + MAX( tfrua(ji,jj) / fse3u(ji,jj,ikbu) , zm1_2dt ) * ub(ji,jj,ikbu) & |
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89 | & * (1.-umask(ji,jj,1)) |
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90 | va(ji,jj,ikbv) = va(ji,jj,ikbv) + MAX( tfrva(ji,jj) / fse3v(ji,jj,ikbv) , zm1_2dt ) * vb(ji,jj,ikbv) & |
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91 | & * (1.-vmask(ji,jj,1)) |
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92 | ! (ISF) |
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93 | |
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94 | END DO |
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95 | END DO |
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96 | |
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97 | ! |
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98 | IF( l_trddyn ) THEN ! save the vertical diffusive trends for further diagnostics |
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99 | ztrdu(:,:,:) = ua(:,:,:) - ztrdu(:,:,:) |
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100 | ztrdv(:,:,:) = va(:,:,:) - ztrdv(:,:,:) |
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101 | CALL trd_dyn( ztrdu(:,:,:), ztrdv(:,:,:), jpdyn_bfr, kt ) |
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102 | CALL wrk_dealloc( jpi,jpj,jpk, ztrdu, ztrdv ) |
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103 | ENDIF |
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104 | ! ! print mean trends (used for debugging) |
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105 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' bfr - Ua: ', mask1=umask, & |
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106 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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107 | ! |
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108 | ENDIF ! end explicit bottom friction |
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109 | ! |
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110 | IF( nn_timing == 1 ) CALL timing_stop('dyn_bfr') |
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111 | ! |
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112 | END SUBROUTINE dyn_bfr |
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113 | |
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114 | !!============================================================================== |
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115 | END MODULE dynbfr |
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