[3] | 1 | MODULE dynkeg |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE dynkeg *** |
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| 4 | !! Ocean dynamics: kinetic energy gradient trend |
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| 5 | !!====================================================================== |
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[5321] | 6 | !! History : 1.0 ! 1987-09 (P. Andrich, M.-A. Foujols) Original code |
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| 7 | !! 7.0 ! 1997-05 (G. Madec) Split dynber into dynkeg and dynhpg |
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| 8 | !! NEMO 1.0 ! 2002-07 (G. Madec) F90: Free form and module |
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[5328] | 9 | !! 3.6 ! 2015-05 (N. Ducousso, G. Madec) add Hollingsworth scheme as an option |
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[503] | 10 | !!---------------------------------------------------------------------- |
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[5328] | 11 | |
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[3] | 12 | !!---------------------------------------------------------------------- |
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| 13 | !! dyn_keg : update the momentum trend with the horizontal tke |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE oce ! ocean dynamics and tracers |
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| 16 | USE dom_oce ! ocean space and time domain |
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[4990] | 17 | USE trd_oce ! trends: ocean variables |
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| 18 | USE trddyn ! trend manager: dynamics |
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| 19 | ! |
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[2715] | 20 | USE in_out_manager ! I/O manager |
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[5321] | 21 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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[2715] | 22 | USE lib_mpp ! MPP library |
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[258] | 23 | USE prtctl ! Print control |
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[3294] | 24 | USE timing ! Timing |
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[7646] | 25 | USE bdy_oce ! ocean open boundary conditions |
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[3] | 26 | |
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| 27 | IMPLICIT NONE |
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| 28 | PRIVATE |
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| 29 | |
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[503] | 30 | PUBLIC dyn_keg ! routine called by step module |
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[5328] | 31 | |
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[5321] | 32 | INTEGER, PARAMETER, PUBLIC :: nkeg_C2 = 0 !: 2nd order centered scheme (standard scheme) |
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| 33 | INTEGER, PARAMETER, PUBLIC :: nkeg_HW = 1 !: Hollingsworth et al., QJRMS, 1983 |
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| 34 | ! |
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| 35 | REAL(wp) :: r1_48 = 1._wp / 48._wp !: =1/(4*2*6) |
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[5328] | 36 | |
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[3] | 37 | !! * Substitutions |
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| 38 | # include "vectopt_loop_substitute.h90" |
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[503] | 39 | !!---------------------------------------------------------------------- |
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[9598] | 40 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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[11715] | 41 | !! $Id$ |
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[10068] | 42 | !! Software governed by the CeCILL license (see ./LICENSE) |
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[503] | 43 | !!---------------------------------------------------------------------- |
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[3] | 44 | CONTAINS |
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| 45 | |
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[5321] | 46 | SUBROUTINE dyn_keg( kt, kscheme ) |
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[3] | 47 | !!---------------------------------------------------------------------- |
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| 48 | !! *** ROUTINE dyn_keg *** |
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| 49 | !! |
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| 50 | !! ** Purpose : Compute the now momentum trend due to the horizontal |
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[5328] | 51 | !! gradient of the horizontal kinetic energy and add it to the |
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[3] | 52 | !! general momentum trend. |
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| 53 | !! |
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[5328] | 54 | !! ** Method : * kscheme = nkeg_C2 : 2nd order centered scheme that |
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| 55 | !! conserve kinetic energy. Compute the now horizontal kinetic energy |
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[3] | 56 | !! zhke = 1/2 [ mi-1( un^2 ) + mj-1( vn^2 ) ] |
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[5321] | 57 | !! * kscheme = nkeg_HW : Hollingsworth correction following |
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| 58 | !! Arakawa (2001). The now horizontal kinetic energy is given by: |
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| 59 | !! zhke = 1/6 [ mi-1( 2 * un^2 + ((un(j+1)+un(j-1))/2)^2 ) |
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| 60 | !! + mj-1( 2 * vn^2 + ((vn(i+1)+vn(i-1))/2)^2 ) ] |
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[5328] | 61 | !! |
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[3] | 62 | !! Take its horizontal gradient and add it to the general momentum |
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| 63 | !! trend (ua,va). |
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| 64 | !! ua = ua - 1/e1u di[ zhke ] |
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| 65 | !! va = va - 1/e2v dj[ zhke ] |
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| 66 | !! |
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| 67 | !! ** Action : - Update the (ua, va) with the hor. ke gradient trend |
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[4990] | 68 | !! - send this trends to trd_dyn (l_trddyn=T) for post-processing |
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[5321] | 69 | !! |
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| 70 | !! ** References : Arakawa, A., International Geophysics 2001. |
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| 71 | !! Hollingsworth et al., Quart. J. Roy. Meteor. Soc., 1983. |
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[503] | 72 | !!---------------------------------------------------------------------- |
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[5321] | 73 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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[5328] | 74 | INTEGER, INTENT( in ) :: kscheme ! =0/1 type of KEG scheme |
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[4990] | 75 | ! |
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[11536] | 76 | INTEGER :: ji, jj, jk ! dummy loop indices |
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[10996] | 77 | REAL(wp) :: zu, zv ! local scalars |
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[9019] | 78 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zhke |
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| 79 | REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ztrdu, ztrdv |
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[3] | 80 | !!---------------------------------------------------------------------- |
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[3294] | 81 | ! |
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[9019] | 82 | IF( ln_timing ) CALL timing_start('dyn_keg') |
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[3294] | 83 | ! |
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[3] | 84 | IF( kt == nit000 ) THEN |
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| 85 | IF(lwp) WRITE(numout,*) |
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[5321] | 86 | IF(lwp) WRITE(numout,*) 'dyn_keg : kinetic energy gradient trend, scheme number=', kscheme |
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[3] | 87 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
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| 88 | ENDIF |
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[216] | 89 | |
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[9019] | 90 | IF( l_trddyn ) THEN ! Save the input trends |
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| 91 | ALLOCATE( ztrdu(jpi,jpj,jpk) , ztrdv(jpi,jpj,jpk) ) |
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[7753] | 92 | ztrdu(:,:,:) = ua(:,:,:) |
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| 93 | ztrdv(:,:,:) = va(:,:,:) |
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[216] | 94 | ENDIF |
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[5328] | 95 | |
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[7753] | 96 | zhke(:,:,jpk) = 0._wp |
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[7646] | 97 | |
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[5328] | 98 | SELECT CASE ( kscheme ) !== Horizontal kinetic energy at T-point ==! |
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| 99 | ! |
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| 100 | CASE ( nkeg_C2 ) !-- Standard scheme --! |
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| 101 | DO jk = 1, jpkm1 |
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[5321] | 102 | DO jj = 2, jpj |
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| 103 | DO ji = fs_2, jpi ! vector opt. |
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| 104 | zu = un(ji-1,jj ,jk) * un(ji-1,jj ,jk) & |
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| 105 | & + un(ji ,jj ,jk) * un(ji ,jj ,jk) |
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| 106 | zv = vn(ji ,jj-1,jk) * vn(ji ,jj-1,jk) & |
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| 107 | & + vn(ji ,jj ,jk) * vn(ji ,jj ,jk) |
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[5328] | 108 | zhke(ji,jj,jk) = 0.25_wp * ( zv + zu ) |
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| 109 | END DO |
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[5321] | 110 | END DO |
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[5328] | 111 | END DO |
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| 112 | CASE ( nkeg_HW ) !-- Hollingsworth scheme --! |
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| 113 | DO jk = 1, jpkm1 |
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| 114 | DO jj = 2, jpjm1 |
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[5321] | 115 | DO ji = fs_2, jpim1 ! vector opt. |
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| 116 | zu = 8._wp * ( un(ji-1,jj ,jk) * un(ji-1,jj ,jk) & |
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| 117 | & + un(ji ,jj ,jk) * un(ji ,jj ,jk) ) & |
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| 118 | & + ( un(ji-1,jj-1,jk) + un(ji-1,jj+1,jk) ) * ( un(ji-1,jj-1,jk) + un(ji-1,jj+1,jk) ) & |
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| 119 | & + ( un(ji ,jj-1,jk) + un(ji ,jj+1,jk) ) * ( un(ji ,jj-1,jk) + un(ji ,jj+1,jk) ) |
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| 120 | ! |
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| 121 | zv = 8._wp * ( vn(ji ,jj-1,jk) * vn(ji ,jj-1,jk) & |
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| 122 | & + vn(ji ,jj ,jk) * vn(ji ,jj ,jk) ) & |
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| 123 | & + ( vn(ji-1,jj-1,jk) + vn(ji+1,jj-1,jk) ) * ( vn(ji-1,jj-1,jk) + vn(ji+1,jj-1,jk) ) & |
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| 124 | & + ( vn(ji-1,jj ,jk) + vn(ji+1,jj ,jk) ) * ( vn(ji-1,jj ,jk) + vn(ji+1,jj ,jk) ) |
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[5328] | 125 | zhke(ji,jj,jk) = r1_48 * ( zv + zu ) |
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| 126 | END DO |
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[5321] | 127 | END DO |
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[5328] | 128 | END DO |
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[10425] | 129 | CALL lbc_lnk( 'dynkeg', zhke, 'T', 1. ) |
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[5321] | 130 | ! |
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[10996] | 131 | END SELECT |
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[5328] | 132 | ! |
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| 133 | DO jk = 1, jpkm1 !== grad( KE ) added to the general momentum trends ==! |
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[5321] | 134 | DO jj = 2, jpjm1 |
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[3] | 135 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[5328] | 136 | ua(ji,jj,jk) = ua(ji,jj,jk) - ( zhke(ji+1,jj ,jk) - zhke(ji,jj,jk) ) / e1u(ji,jj) |
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| 137 | va(ji,jj,jk) = va(ji,jj,jk) - ( zhke(ji ,jj+1,jk) - zhke(ji,jj,jk) ) / e2v(ji,jj) |
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| 138 | END DO |
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[3] | 139 | END DO |
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[5321] | 140 | END DO |
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| 141 | ! |
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| 142 | IF( l_trddyn ) THEN ! save the Kinetic Energy trends for diagnostic |
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[7753] | 143 | ztrdu(:,:,:) = ua(:,:,:) - ztrdu(:,:,:) |
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| 144 | ztrdv(:,:,:) = va(:,:,:) - ztrdv(:,:,:) |
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[4990] | 145 | CALL trd_dyn( ztrdu, ztrdv, jpdyn_keg, kt ) |
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[9019] | 146 | DEALLOCATE( ztrdu , ztrdv ) |
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[216] | 147 | ENDIF |
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[503] | 148 | ! |
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| 149 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' keg - Ua: ', mask1=umask, & |
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| 150 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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| 151 | ! |
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[9019] | 152 | IF( ln_timing ) CALL timing_stop('dyn_keg') |
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[2715] | 153 | ! |
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[3] | 154 | END SUBROUTINE dyn_keg |
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| 155 | |
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| 156 | !!====================================================================== |
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| 157 | END MODULE dynkeg |
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