1 | MODULE dynstcor |
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2 | !! PHILLIPPS PARAMETRIZATION |
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3 | !!====================================================================== |
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4 | !! *** MODULE dynstcor *** |
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5 | !! Ocean dynamics: Stokes-Coriolis effect. |
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6 | !! |
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7 | !!====================================================================== |
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8 | !! History : 0.1 ! 2012-10 (Oyvind Breivik) |
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9 | !! 0.2 ! 2016-06 (oyvind.breivik@met.no) |
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10 | !! ! Changed Stokes profile to the Phillips approximation |
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11 | !! Ref: Breivik, O, J-R Bidlot, P A Janssen (2016). |
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12 | !! A Stokes drift approximation based on the Phillips spectrum, |
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13 | !! Ocean Model, 100, pp 49-56, doi:10.1016/j.ocemod.2016.01.005 |
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14 | !! 0.2.1! 2016-12 WAVE2NEMO: adapted to NEMO3.6, this is the PHILLIPS approximation |
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15 | !!---------------------------------------------------------------------- |
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16 | !! dyn_stcor : Add the Stokes-Coriolis forcing to the momentum equation |
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17 | !!---------------------------------------------------------------------- |
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18 | USE oce ! ocean dynamics and tracers |
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19 | USE dom_oce ! ocean space and time domain |
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20 | ! USE obc_oce ! ocean lateral open boundary condition !! WAVE2NEMO: does not exist in NEMO36 |
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21 | USE in_out_manager ! I/O manager |
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22 | USE lib_mpp ! distributed memory computing |
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23 | USE prtctl ! Print control |
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24 | USE phycst |
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25 | USE lbclnk |
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26 | USE wrk_nemo ! Memory Allocation |
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27 | USE sbcmod ! Access to ln_stcor (sbc_oce) and wave parameters (sbc_wave) |
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28 | USE sbcwave ! Wave module |
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29 | |
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30 | IMPLICIT NONE |
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31 | |
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32 | REAL(wp) :: rn_deptmaxstcor = 150.0_wp ! maximum depth [m] to be affected by Stokes-Coriolis effect |
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33 | !PRIVATE |
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34 | |
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35 | !! * Routine accessibility |
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36 | PUBLIC dyn_stcor ! routine called by step.F90 |
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37 | |
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38 | !! * Shared module variables |
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39 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: ustc, vstc ! Stokes-Coriolis u and v |
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40 | |
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41 | !! * Module variables |
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42 | |
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43 | !! * Substitutions |
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44 | # include "vectopt_loop_substitute.h90" |
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45 | # include "domzgr_substitute.h90" |
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46 | !!---------------------------------------------------------------------- |
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47 | !! OPA 9.0 , implemented by Bedford Institute of Oceanography |
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48 | !!---------------------------------------------------------------------- |
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49 | |
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50 | CONTAINS |
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51 | |
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52 | INTEGER FUNCTION dynstcor_alloc() |
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53 | !!---------------------------------------------------------------------- |
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54 | !! *** ROUTINE dynstcor_alloc *** |
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55 | !! |
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56 | !! History : 1.0 ! 2012-10 (Oyvind Breivik) |
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57 | !!---------------------------------------------------------------------- |
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58 | ALLOCATE( ustc(jpi,jpj,jpk) , vstc(jpi,jpj,jpk) , STAT=dynstcor_alloc ) |
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59 | ! |
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60 | IF( dynstcor_alloc /= 0 ) CALL ctl_warn('dynstcor_alloc: array allocate failed.') |
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61 | END FUNCTION dynstcor_alloc |
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62 | |
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63 | SUBROUTINE dyn_stcor( kt ) |
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64 | !!---------------------------------------------------------------------- |
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65 | !! *** ROUTINE dyn_stcor *** |
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66 | !! |
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67 | !! ** Purpose: Add Stokes-Coriolis forcing to horizontal momentum equation. |
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68 | !! |
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69 | !! ** History: 0.1 ! 2012-10 oyvind.breivik@ecmwf.int |
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70 | !!---------------------------------------------------------------------- |
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71 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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72 | !! |
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73 | INTEGER :: ji, jj, jk ! dummy loop indices |
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74 | REAL(wp) :: ztransp, zsp0, zk, zfac |
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75 | REAL(wp) :: zus, zvs |
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76 | ! |
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77 | |
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78 | ! Allocation at first time step. |
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79 | |
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80 | IF ( kt == nit000 ) THEN |
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81 | IF( dynstcor_alloc() /= 0 ) CALL ctl_stop('dyn_stcor_phil: array allocate failed.') |
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82 | ENDIF |
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83 | |
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84 | !!---------------------------------------------------------------------- |
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85 | ! |
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86 | ! Update velocity tendencies ua, va by adding the Stokes-Coriolis velocities ustc, vstc |
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87 | ! |
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88 | DO jk = 1, jpk |
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89 | DO jj = 1, jpj |
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90 | DO ji = 1, jpi |
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91 | ! Skip deep levels where the Stokes-Coriolis effect is negligible |
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92 | IF (fsdept(ji,jj,jk) <= rn_deptmaxstcor) THEN |
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93 | ! Stokes transport speed estimated from Hs and Tmean |
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94 | ztransp = 2.0_wp*rpi*swh_wavepar(ji,jj)**2.0_wp/(16.0_wp*MAX(mwp_wavepar(ji,jj),0.0000001_wp)) |
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95 | |
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96 | ! Stokes surface speed |
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97 | zsp0 = SQRT(ust_wavepar(ji,jj)**2 + vst_wavepar(ji,jj)**2) |
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98 | |
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99 | ! Wavenumber scale |
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100 | !zk = ABS(zsp0)/MAX(ABS(5.97_wp*ztransp),0.0000001_wp) |
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101 | zk = (1.0_wp-2.0_wp/3.0_wp)*zsp0/MAX(2.0_wp*ztransp,0.0000001_wp) |
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102 | |
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103 | ! Depth attenuation |
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104 | !zfac = EXP(-2.0_wp*zk*fsdept(ji,jj,jk))/(1.0_wp+8.0_wp*zk*fsdept(ji,jj,jk)) |
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105 | zfac = EXP(-2.0*zk*fsdept(ji,jj,jk)) - SQRT(2.0_wp*rpi*zk*fsdept(ji,jj,jk))*ERFC(SQRT(2.0_wp*zk*fsdept(ji,jj,jk))) |
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106 | |
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107 | ! The Stokes-Coriolis forcing |
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108 | zus = ff(ji,jj)*vst_wavepar(ji,jj)*zfac |
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109 | zvs = -ff(ji,jj)*ust_wavepar(ji,jj)*zfac |
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110 | |
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111 | ! Store arrays of tendencies for diagnostics output |
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112 | ! This may be removed later for efficiency |
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113 | ustc(ji,jj,jk) = zus |
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114 | vstc(ji,jj,jk) = zvs |
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115 | |
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116 | ua(ji,jj,jk) = ua(ji,jj,jk) + zus * umask(ji,jj,jk) |
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117 | va(ji,jj,jk) = va(ji,jj,jk) + zvs * vmask(ji,jj,jk) |
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118 | ENDIF |
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119 | ENDDO |
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120 | ENDDO |
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121 | ENDDO |
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122 | ! |
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123 | END SUBROUTINE dyn_stcor |
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124 | |
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125 | |
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126 | END MODULE dynstcor |
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