| 1 | MODULE divhor |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE divhor *** |
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| 4 | !! Ocean diagnostic variable : now horizontal divergence |
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| 5 | !!============================================================================== |
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| 6 | !! History : 1.0 ! 2002-09 (G. Madec, E. Durand) Free form, F90 |
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| 7 | !! - ! 2005-01 (J. Chanut) Unstructured open boundaries |
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| 8 | !! - ! 2003-08 (G. Madec) merged of cur and div, free form, F90 |
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| 9 | !! - ! 2005-01 (J. Chanut, A. Sellar) unstructured open boundaries |
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| 10 | !! 3.3 ! 2010-09 (D.Storkey and E.O'Dea) bug fixes for BDY module |
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| 11 | !! - ! 2010-10 (R. Furner, G. Madec) runoff and cla added directly here |
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| 12 | !! 3.7 ! 2014-01 (G. Madec) suppression of velocity curl from in-core memory |
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| 13 | !! - ! 2014-12 (G. Madec) suppression of cross land advection option |
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| 14 | !! - ! 2015-10 (G. Madec) add velocity and rnf flag in argument of div_hor |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | !! div_hor : Compute the horizontal divergence field |
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| 19 | !!---------------------------------------------------------------------- |
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| 20 | USE oce ! ocean dynamics and tracers |
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| 21 | USE dom_oce ! ocean space and time domain |
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| 22 | USE sbc_oce, ONLY : ln_rnf, ln_isf ! surface boundary condition: ocean |
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| 23 | USE sbcrnf ! river runoff |
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| 24 | USE sbcisf ! ice shelf |
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| 25 | USE iscplhsb ! ice sheet / ocean coupling |
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| 26 | USE iscplini ! ice sheet / ocean coupling |
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| 27 | ! |
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| 28 | USE in_out_manager ! I/O manager |
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| 29 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 30 | USE lib_mpp ! MPP library |
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| 31 | USE timing ! Timing |
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| 32 | |
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| 33 | IMPLICIT NONE |
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| 34 | PRIVATE |
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| 35 | |
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| 36 | PUBLIC div_hor ! routine called by step.F90 and istate.F90 |
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| 37 | |
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| 38 | !! * Substitutions |
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| 39 | # include "vectopt_loop_substitute.h90" |
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| 40 | !!---------------------------------------------------------------------- |
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| 41 | !! NEMO/OPA 4.0 , NEMO Consortium (2017) |
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| 42 | !! $Id$ |
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| 43 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 44 | !!---------------------------------------------------------------------- |
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| 45 | CONTAINS |
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| 46 | |
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| 47 | SUBROUTINE div_hor( kt ) |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! *** ROUTINE div_hor *** |
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| 50 | !! |
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| 51 | !! ** Purpose : compute the horizontal divergence at now time-step |
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| 52 | !! |
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| 53 | !! ** Method : the now divergence is computed as : |
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| 54 | !! hdivn = 1/(e1e2t*e3t) ( di[e2u*e3u un] + dj[e1v*e3v vn] ) |
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| 55 | !! and correct with runoff inflow (div_rnf) and cross land flow (div_cla) |
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| 56 | !! |
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| 57 | !! ** Action : - update hdivn, the now horizontal divergence |
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| 58 | !!---------------------------------------------------------------------- |
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| 59 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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| 60 | ! |
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| 61 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 62 | REAL(wp) :: zraur, zdep ! local scalars |
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| 63 | !!---------------------------------------------------------------------- |
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| 64 | ! |
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| 65 | IF( ln_timing ) CALL timing_start('div_hor') |
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| 66 | ! |
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| 67 | IF( kt == nit000 ) THEN |
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| 68 | IF(lwp) WRITE(numout,*) |
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| 69 | IF(lwp) WRITE(numout,*) 'div_hor : horizontal velocity divergence ' |
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| 70 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 71 | ENDIF |
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| 72 | ! |
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| 73 | DO jk = 1, jpkm1 !== Horizontal divergence ==! |
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| 74 | DO jj = 2, jpjm1 |
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| 75 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 76 | hdivn(ji,jj,jk) = ( e2u(ji ,jj) * e3u_n(ji ,jj,jk) * un(ji ,jj,jk) & |
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| 77 | & - e2u(ji-1,jj) * e3u_n(ji-1,jj,jk) * un(ji-1,jj,jk) & |
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| 78 | & + e1v(ji,jj ) * e3v_n(ji,jj ,jk) * vn(ji,jj ,jk) & |
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| 79 | & - e1v(ji,jj-1) * e3v_n(ji,jj-1,jk) * vn(ji,jj-1,jk) ) & |
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| 80 | & * r1_e1e2t(ji,jj) / e3t_n(ji,jj,jk) |
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| 81 | END DO |
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| 82 | END DO |
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| 83 | END DO |
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| 84 | #if defined key_agrif |
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| 85 | IF( .NOT. Agrif_Root() ) THEN |
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| 86 | IF( nbondi == -1 .OR. nbondi == 2 ) hdivn( 2:nbghostcells+1,: ,:) = 0._wp ! west |
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| 87 | IF( nbondi == 1 .OR. nbondi == 2 ) hdivn( nlci-nbghostcells:nlci-1,:,:) = 0._wp ! east |
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| 88 | IF( nbondj == -1 .OR. nbondj == 2 ) hdivn( :,2:nbghostcells+1 ,:) = 0._wp ! south |
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| 89 | IF( nbondj == 1 .OR. nbondj == 2 ) hdivn( :,nlcj-nbghostcells:nlcj-1,:) = 0._wp ! north |
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| 90 | ENDIF |
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| 91 | #endif |
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| 92 | ! |
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| 93 | IF( ln_rnf ) CALL sbc_rnf_div( hdivn ) !== runoffs ==! (update hdivn field) |
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| 94 | ! |
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| 95 | IF( ln_isf ) CALL sbc_isf_div( hdivn ) !== ice shelf ==! (update hdivn field) |
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| 96 | ! |
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| 97 | IF( ln_iscpl .AND. ln_hsb ) CALL iscpl_div( hdivn ) !== ice sheet ==! (update hdivn field) |
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| 98 | ! |
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| 99 | CALL lbc_lnk( hdivn, 'T', 1. ) ! (no sign change) |
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| 100 | ! |
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| 101 | IF( ln_timing ) CALL timing_stop('div_hor') |
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| 102 | ! |
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| 103 | END SUBROUTINE div_hor |
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| 104 | |
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| 105 | !!====================================================================== |
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| 106 | END MODULE divhor |
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