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 | !!---------------------------------------------------------------------- |
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8 | |
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9 | !!---------------------------------------------------------------------- |
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10 | !! dyn_bfr : Update the momentum trend with the bottom friction contribution |
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11 | !!---------------------------------------------------------------------- |
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12 | USE oce ! ocean dynamics and tracers variables |
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13 | USE dom_oce ! ocean space and time domain variables |
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14 | USE zdf_oce ! ocean vertical physics variables |
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15 | USE zdfbfr ! ocean bottom friction variables |
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16 | USE trdmod ! ocean active dynamics and tracers trends |
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17 | USE trdmod_oce ! ocean variables trends |
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18 | USE in_out_manager ! I/O manager |
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19 | USE prtctl ! Print control |
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20 | USE timing ! Timing |
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21 | |
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22 | IMPLICIT NONE |
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23 | PRIVATE |
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24 | |
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25 | PUBLIC dyn_bfr ! 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 "zdfddm_substitute.h90" |
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30 | # include "vectopt_loop_substitute.h90" |
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31 | !!---------------------------------------------------------------------- |
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32 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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33 | !! $Id$ |
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34 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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35 | !!---------------------------------------------------------------------- |
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36 | CONTAINS |
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37 | |
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38 | SUBROUTINE dyn_bfr( kt ) |
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39 | !!---------------------------------------------------------------------- |
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40 | !! *** ROUTINE dyn_bfr *** |
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41 | !! |
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42 | !! ** Purpose : compute the bottom friction ocean dynamics physics. |
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43 | !! |
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44 | !! ** Action : (ua,va) momentum trend increased by bottom friction trend |
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45 | !!--------------------------------------------------------------------- |
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46 | USE oce, ONLY: ztrduv => tsa ! tsa used as 4D workspace |
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47 | !! |
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48 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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49 | !! |
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50 | INTEGER :: ji, jj ! dummy loop indexes |
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51 | INTEGER :: ikbu, ikbv ! local integers |
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52 | REAL(wp) :: zm1_2dt ! local scalar |
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53 | !!--------------------------------------------------------------------- |
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54 | ! |
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55 | IF( nn_timing == 1 ) CALL timing_start('dyn_bfr') |
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56 | ! |
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57 | IF( .NOT.ln_bfrimp) THEN ! only for explicit bottom friction form |
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58 | ! implicit bfr is implemented in dynzdf_imp |
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59 | ! H. Liu, Sept. 2011 |
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60 | |
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61 | zm1_2dt = - 1._wp / ( 2._wp * rdt ) |
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62 | |
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63 | IF( l_trddyn ) THEN ! temporary save of ua and va trends |
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64 | ztrduv(:,:,:,1) = ua(:,:,:) |
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65 | ztrduv(:,:,:,2) = va(:,:,:) |
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66 | ENDIF |
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67 | |
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68 | |
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69 | # if defined key_vectopt_loop |
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70 | DO jj = 1, 1 |
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71 | DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) |
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72 | # else |
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73 | DO jj = 2, jpjm1 |
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74 | DO ji = 2, jpim1 |
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75 | # endif |
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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 | END DO |
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83 | END DO |
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84 | |
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85 | ! |
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86 | IF( l_trddyn ) THEN ! save the vertical diffusive trends for further diagnostics |
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87 | ztrduv(:,:,:,1) = ua(:,:,:) - ztrduv(:,:,:,1) |
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88 | ztrduv(:,:,:,2) = va(:,:,:) - ztrduv(:,:,:,2) |
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89 | CALL trd_mod( ztrduv(:,:,:,1), ztrduv(:,:,:,2), jpdyn_trd_bfr, 'DYN', kt ) |
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90 | ENDIF |
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91 | ! ! print mean trends (used for debugging) |
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92 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' bfr - Ua: ', mask1=umask, & |
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93 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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94 | ! |
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95 | ENDIF ! end explicit bottom friction |
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96 | ! |
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97 | IF( nn_timing == 1 ) CALL timing_stop('dyn_bfr') |
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98 | ! |
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99 | END SUBROUTINE dyn_bfr |
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100 | |
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101 | !!============================================================================== |
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102 | END MODULE dynbfr |
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