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 ! river runoff |
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23 | USE sbcrnf , ONLY : sbc_rnf_div ! river runoff |
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24 | USE isf_oce, ONLY : ln_isf ! ice shelf |
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25 | USE isfhdiv, ONLY : isf_hdiv ! ice shelf |
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26 | #if defined key_asminc |
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27 | USE asminc ! Assimilation increment |
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28 | #endif |
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29 | ! |
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30 | USE in_out_manager ! I/O manager |
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31 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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32 | USE lib_mpp ! MPP library |
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33 | USE timing ! Timing |
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34 | |
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35 | IMPLICIT NONE |
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36 | PRIVATE |
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37 | |
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38 | PUBLIC div_hor ! routine called by step.F90 and istate.F90 |
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39 | |
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40 | !! * Substitutions |
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41 | # include "do_loop_substitute.h90" |
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42 | !!---------------------------------------------------------------------- |
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43 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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44 | !! $Id$ |
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45 | !! Software governed by the CeCILL license (see ./LICENSE) |
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46 | !!---------------------------------------------------------------------- |
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47 | CONTAINS |
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48 | |
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49 | SUBROUTINE div_hor( kt, Kbb, Kmm ) |
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50 | !!---------------------------------------------------------------------- |
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51 | !! *** ROUTINE div_hor *** |
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52 | !! |
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53 | !! ** Purpose : compute the horizontal divergence at now time-step |
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54 | !! |
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55 | !! ** Method : the now divergence is computed as : |
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56 | !! hdiv = 1/(e1e2t*e3t) ( di[e2u*e3u un] + dj[e1v*e3v vn] ) |
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57 | !! and correct with runoff inflow (div_rnf) and cross land flow (div_cla) |
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58 | !! |
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59 | !! ** Action : - update hdiv, the now horizontal divergence |
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60 | !!---------------------------------------------------------------------- |
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61 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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62 | INTEGER, INTENT(in) :: Kbb, Kmm ! ocean time level indices |
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63 | ! |
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64 | INTEGER :: ji, jj, jk ! dummy loop indices |
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65 | REAL(wp) :: zraur, zdep ! local scalars |
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66 | REAL(wp), DIMENSION(jpi,jpj) :: ztmp |
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67 | !!---------------------------------------------------------------------- |
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68 | ! |
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69 | IF( ln_timing ) CALL timing_start('div_hor') |
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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,*) 'div_hor : horizontal velocity divergence ' |
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74 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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75 | hdiv(:,:,:) = 0._wp ! initialize hdiv for the halos at the first time step |
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76 | ENDIF |
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77 | ! |
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78 | DO_3D_00_00( 1, jpkm1 ) |
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79 | hdiv(ji,jj,jk) = ( e2u(ji ,jj) * e3u(ji ,jj,jk,Kmm) * uu(ji ,jj,jk,Kmm) & |
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80 | & - e2u(ji-1,jj) * e3u(ji-1,jj,jk,Kmm) * uu(ji-1,jj,jk,Kmm) & |
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81 | & + e1v(ji,jj ) * e3v(ji,jj ,jk,Kmm) * vv(ji,jj ,jk,Kmm) & |
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82 | & - e1v(ji,jj-1) * e3v(ji,jj-1,jk,Kmm) * vv(ji,jj-1,jk,Kmm) ) & |
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83 | & * r1_e1e2t(ji,jj) / e3t(ji,jj,jk,Kmm) |
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84 | END_3D |
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85 | ! |
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86 | IF( ln_rnf ) CALL sbc_rnf_div( hdiv, Kmm ) !== runoffs ==! (update hdiv field) |
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87 | ! |
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88 | #if defined key_asminc |
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89 | IF( ln_sshinc .AND. ln_asmiau ) CALL ssh_asm_div( kt, Kbb, Kmm, hdiv ) !== SSH assimilation ==! (update hdiv field) |
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90 | ! |
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91 | #endif |
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92 | ! |
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93 | IF( ln_isf ) CALL isf_hdiv( kt, Kmm, hdiv ) !== ice shelf ==! (update hdiv field) |
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94 | ! |
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95 | CALL lbc_lnk( 'divhor', hdiv, 'T', 1. ) ! (no sign change) |
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96 | ! |
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97 | IF( ln_timing ) CALL timing_stop('div_hor') |
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98 | ! |
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99 | END SUBROUTINE div_hor |
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100 | |
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101 | !!====================================================================== |
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102 | END MODULE divhor |
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