1 | MODULE dynnxt |
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2 | !!====================================================================== |
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3 | !! *** MODULE dynnxt *** |
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4 | !! Ocean dynamics: time stepping |
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5 | !!====================================================================== |
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6 | |
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7 | !!---------------------------------------------------------------------- |
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8 | !! dyn_nxt : update the horizontal velocity from the momentum trend |
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9 | !!---------------------------------------------------------------------- |
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10 | !! * Modules used |
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11 | USE oce ! ocean dynamics and tracers |
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12 | USE dom_oce ! ocean space and time domain |
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13 | USE in_out_manager ! I/O manager |
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14 | USE obcdyn ! open boundary condition for momentum (obc_dyn routine) |
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15 | USE lbclnk ! lateral boundary condition (or mpp link) |
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16 | USE prtctl ! Print control |
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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 | !! * Accessibility |
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22 | PUBLIC dyn_nxt ! routine called by step.F90 |
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23 | !!---------------------------------------------------------------------- |
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24 | |
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25 | CONTAINS |
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26 | |
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27 | SUBROUTINE dyn_nxt ( kt ) |
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28 | !!---------------------------------------------------------------------- |
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29 | !! *** ROUTINE dyn_nxt *** |
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30 | !! |
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31 | !! ** Purpose : Compute the after horizontal velocity from the |
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32 | !! momentum trend. |
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33 | !! |
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34 | !! ** Method : Apply lateral boundary conditions on the trends (ua,va) |
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35 | !! through calls to routine lbc_lnk. |
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36 | !! After velocity is compute using a leap-frog scheme environment: |
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37 | !! (ua,va) = (ub,vb) + 2 rdt (ua,va) |
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38 | !! Note that if lk_dynspg_fsc=T, the time stepping has already been |
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39 | !! performed in dynspg module |
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40 | !! Time filter applied on now horizontal velocity to avoid the |
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41 | !! divergence of two consecutive time-steps and swap of dynamics |
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42 | !! arrays to start the next time step: |
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43 | !! (ub,vb) = (un,vn) + atfp [ (ub,vb) + (ua,va) - 2 (un,vn) ] |
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44 | !! (un,vn) = (ua,va) |
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45 | !! |
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46 | !! ** Action : - Update ub,vb arrays, the before horizontal velocity |
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47 | !! - Update un,vn arrays, the now horizontal velocity |
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48 | !! |
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49 | !! History : |
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50 | !! ! 87-02 (P. Andrich, D. L Hostis) Original code |
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51 | !! ! 90-10 (C. Levy, G. Madec) |
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52 | !! ! 93-03 (M. Guyon) symetrical conditions |
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53 | !! ! 97-02 (G. Madec & M. Imbard) opa, release 8.0 |
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54 | !! ! 97-04 (A. Weaver) Euler forward step |
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55 | !! ! 97-06 (G. Madec) lateral boudary cond., lbc routine |
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56 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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57 | !! ! 02-10 (C. Talandier, A-M. Treguier) Open boundary cond. |
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58 | !!---------------------------------------------------------------------- |
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59 | !! * Arguments |
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60 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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61 | |
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62 | !! * Local declarations |
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63 | INTEGER :: ji, jj, jk ! dummy loop indices |
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64 | REAL(wp) :: z2dt ! temporary scalar |
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65 | !!---------------------------------------------------------------------- |
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66 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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67 | !! $Header$ |
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68 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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69 | !!---------------------------------------------------------------------- |
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70 | |
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71 | IF( kt == nit000 ) THEN |
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72 | IF(lwp) WRITE(numout,*) |
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73 | IF(lwp) WRITE(numout,*) 'dyn_nxt : time stepping' |
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74 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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75 | ENDIF |
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76 | |
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77 | ! Local constant initialization |
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78 | z2dt = 2. * rdt |
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79 | IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt |
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80 | |
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81 | ! Lateral boundary conditions on ( ua, va ) |
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82 | CALL lbc_lnk( ua, 'U', -1. ) |
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83 | CALL lbc_lnk( va, 'V', -1. ) |
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84 | |
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85 | ! ! =============== |
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86 | DO jk = 1, jpkm1 ! Horizontal slab |
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87 | ! ! =============== |
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88 | ! Next velocity |
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89 | ! ------------- |
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90 | #if defined key_dynspg_fsc |
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91 | ! Leap-frog time stepping already done in dynspg.F routine |
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92 | #else |
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93 | DO jj = 1, jpj ! caution: don't use (:,:) for this loop |
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94 | DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking |
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95 | ! Leap-frog time stepping |
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96 | ua(ji,jj,jk) = ( ub(ji,jj,jk) + z2dt * ua(ji,jj,jk) ) * umask(ji,jj,jk) |
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97 | va(ji,jj,jk) = ( vb(ji,jj,jk) + z2dt * va(ji,jj,jk) ) * vmask(ji,jj,jk) |
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98 | END DO |
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99 | END DO |
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100 | # if defined key_obc |
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101 | ! ! =============== |
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102 | END DO ! End of slab |
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103 | ! ! =============== |
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104 | ! Update (ua,va) along open boundaries (only in the rigid-lid case) |
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105 | CALL obc_dyn( kt ) |
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106 | ! ! =============== |
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107 | DO jk = 1, jpkm1 ! Horizontal slab |
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108 | ! ! =============== |
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109 | # endif |
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110 | #endif |
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111 | ! Time filter and swap of dynamics arrays |
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112 | ! ------------------------------------------ |
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113 | IF( neuler == 0 .AND. kt == nit000 ) THEN |
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114 | DO jj = 1, jpj ! caution: don't use (:,:) for this loop |
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115 | DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking |
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116 | ! Euler (forward) time stepping |
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117 | ub(ji,jj,jk) = un(ji,jj,jk) |
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118 | vb(ji,jj,jk) = vn(ji,jj,jk) |
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119 | un(ji,jj,jk) = ua(ji,jj,jk) |
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120 | vn(ji,jj,jk) = va(ji,jj,jk) |
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121 | END DO |
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122 | END DO |
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123 | ELSE |
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124 | DO jj = 1, jpj ! caution: don't use (:,:) for this loop |
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125 | DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking |
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126 | ! Leap-frog time stepping |
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127 | ub(ji,jj,jk) = atfp * ( ub(ji,jj,jk) + ua(ji,jj,jk) ) + atfp1 * un(ji,jj,jk) |
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128 | vb(ji,jj,jk) = atfp * ( vb(ji,jj,jk) + va(ji,jj,jk) ) + atfp1 * vn(ji,jj,jk) |
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129 | un(ji,jj,jk) = ua(ji,jj,jk) |
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130 | vn(ji,jj,jk) = va(ji,jj,jk) |
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131 | END DO |
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132 | END DO |
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133 | ENDIF |
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134 | ! ! =============== |
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135 | END DO ! End of slab |
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136 | ! ! =============== |
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137 | |
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138 | IF(ln_ctl) THEN |
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139 | CALL prt_ctl(tab3d_1=un, clinfo1=' nxt - Un: ', mask1=umask, & |
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140 | & tab3d_2=vn, clinfo2=' Vn: ', mask2=vmask) |
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141 | ENDIF |
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142 | |
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143 | END SUBROUTINE dyn_nxt |
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144 | |
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145 | !!====================================================================== |
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146 | END MODULE dynnxt |
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