[3614] | 1 | MODULE icbclv |
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| 2 | |
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| 3 | !!====================================================================== |
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| 4 | !! *** MODULE icbclv *** |
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| 5 | !! Icebergs: calving routines for iceberg calving |
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| 6 | !!====================================================================== |
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| 7 | !! History : 3.3.1 ! 2010-01 (Martin&Adcroft) Original code |
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| 8 | !! - ! 2011-03 (Madec) Part conversion to NEMO form |
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| 9 | !! - ! Removal of mapping from another grid |
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| 10 | !! - ! 2011-04 (Alderson) Split into separate modules |
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| 11 | !! - ! 2011-05 (Alderson) budgets into separate module |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! icb_clv_flx : transfer input flux of ice into iceberg classes |
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| 15 | !! icb_clv : calve icebergs from stored ice |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE par_oce ! NEMO parameters |
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| 18 | USE dom_oce ! NEMO ocean domain |
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| 19 | USE phycst ! NEMO physical constants |
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| 20 | USE lib_mpp ! NEMO MPI library, lk_mpp in particular |
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| 21 | USE lbclnk ! NEMO boundary exchanges for gridded data |
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| 22 | |
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| 23 | USE icb_oce ! iceberg variables |
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| 24 | USE icbdia ! iceberg diagnostics |
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| 25 | USE icbutl ! iceberg utility routines |
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| 26 | |
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[6488] | 27 | USE sbc_oce ! for icesheet freshwater input variables |
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| 28 | USE in_out_manager |
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| 29 | USE iom |
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| 30 | |
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[11738] | 31 | USE yomhook, ONLY: lhook, dr_hook |
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| 32 | USE parkind1, ONLY: jprb, jpim |
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| 33 | |
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[3614] | 34 | IMPLICIT NONE |
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| 35 | PRIVATE |
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| 36 | |
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| 37 | PUBLIC icb_clv_flx ! routine called in icbstp.F90 module |
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| 38 | PUBLIC icb_clv ! routine called in icbstp.F90 module |
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| 39 | |
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| 40 | !!---------------------------------------------------------------------- |
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| 41 | !! NEMO/OPA 3.3 , NEMO Consortium (2011) |
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[5215] | 42 | !! $Id$ |
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[3614] | 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 icb_clv_flx( kt ) |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! *** ROUTINE icb_clv_flx *** |
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| 50 | !! |
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| 51 | !! ** Purpose : accumulate ice available for calving into class arrays |
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| 52 | !! |
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| 53 | !!---------------------------------------------------------------------- |
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| 54 | INTEGER, INTENT(in) :: kt |
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| 55 | ! |
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| 56 | REAL(wp) :: zcalving_used, zdist, zfact |
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[6488] | 57 | REAL(wp) :: zgreenland_calving_sum, zantarctica_calving_sum |
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[3614] | 58 | INTEGER :: jn, ji, jj ! loop counters |
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| 59 | INTEGER :: imx ! temporary integer for max berg class |
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| 60 | LOGICAL, SAVE :: ll_first_call = .TRUE. |
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[11738] | 61 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 62 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 63 | REAL(KIND=jprb) :: zhook_handle |
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| 64 | |
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| 65 | CHARACTER(LEN=*), PARAMETER :: RoutineName='ICB_CLV_FLX' |
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| 66 | |
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| 67 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 68 | |
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[3614] | 69 | !!---------------------------------------------------------------------- |
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| 70 | ! |
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| 71 | ! Adapt calving flux and calving heat flux from coupler for use here |
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| 72 | ! Use interior mask: so no bergs in overlap areas and convert from km^3/year to kg/s |
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| 73 | ! this assumes that input is given as equivalent water flux so that pure water density is appropriate |
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| 74 | |
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[3821] | 75 | zfact = ( (1000._wp)**3 / ( NINT(rday) * nyear_len(1) ) ) * 850._wp |
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[3614] | 76 | berg_grid%calving(:,:) = src_calving(:,:) * tmask_i(:,:) * zfact |
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| 77 | |
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[6488] | 78 | IF( lk_oasis) THEN |
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[8046] | 79 | ! nn_coupled_iceshelf_fluxes uninitialised unless lk_oasis=true |
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| 80 | IF( nn_coupled_iceshelf_fluxes .gt. 0 ) THEN |
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[6488] | 81 | |
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| 82 | ! Adjust total calving rates so that sum of iceberg calving and iceshelf melting in the northern |
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| 83 | ! and southern hemispheres equals rate of increase of mass of greenland and antarctic ice sheets |
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| 84 | ! to preserve total freshwater conservation in coupled models without an active ice sheet model. |
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| 85 | |
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| 86 | zgreenland_calving_sum = SUM( berg_grid%calving(:,:) * greenland_icesheet_mask(:,:) ) |
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| 87 | IF( lk_mpp ) CALL mpp_sum( zgreenland_calving_sum ) |
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| 88 | WHERE( greenland_icesheet_mask(:,:) == 1.0 ) & |
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| 89 | & berg_grid%calving(:,:) = berg_grid%calving(:,:) * greenland_icesheet_mass_rate_of_change * rn_greenland_calving_fraction & |
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| 90 | & / ( zgreenland_calving_sum + 1.0e-10_wp ) |
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| 91 | |
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| 92 | ! check |
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| 93 | IF(lwp) WRITE(numout, *) 'Greenland iceberg calving climatology (kg/s) : ',zgreenland_calving_sum |
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| 94 | zgreenland_calving_sum = SUM( berg_grid%calving(:,:) * greenland_icesheet_mask(:,:) ) |
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| 95 | IF( lk_mpp ) CALL mpp_sum( zgreenland_calving_sum ) |
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| 96 | IF(lwp) WRITE(numout, *) 'Greenland iceberg calving adjusted value (kg/s) : ',zgreenland_calving_sum |
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| 97 | |
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| 98 | zantarctica_calving_sum = SUM( berg_grid%calving(:,:) * antarctica_icesheet_mask(:,:) ) |
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| 99 | IF( lk_mpp ) CALL mpp_sum( zantarctica_calving_sum ) |
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| 100 | WHERE( antarctica_icesheet_mask(:,:) == 1.0 ) & |
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| 101 | berg_grid%calving(:,:) = berg_grid%calving(:,:) * antarctica_icesheet_mass_rate_of_change * rn_antarctica_calving_fraction & |
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| 102 | & / ( zantarctica_calving_sum + 1.0e-10_wp ) |
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| 103 | |
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| 104 | ! check |
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| 105 | IF(lwp) WRITE(numout, *) 'Antarctica iceberg calving climatology (kg/s) : ',zantarctica_calving_sum |
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| 106 | zantarctica_calving_sum = SUM( berg_grid%calving(:,:) * antarctica_icesheet_mask(:,:) ) |
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| 107 | IF( lk_mpp ) CALL mpp_sum( zantarctica_calving_sum ) |
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| 108 | IF(lwp) WRITE(numout, *) 'Antarctica iceberg calving adjusted value (kg/s) : ',zantarctica_calving_sum |
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| 109 | |
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| 110 | ENDIF |
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| 111 | ENDIF |
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| 112 | |
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| 113 | CALL iom_put( 'berg_calve', berg_grid%calving(:,:) ) |
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| 114 | |
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[3614] | 115 | ! Heat in units of W/m2, and mask (just in case) |
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| 116 | berg_grid%calving_hflx(:,:) = src_calving_hflx(:,:) * tmask_i(:,:) |
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| 117 | |
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| 118 | IF( ll_first_call .AND. .NOT. l_restarted_bergs) THEN ! This is a hack to simplify initialization |
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| 119 | ll_first_call = .FALSE. |
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| 120 | !do jn=1, nclasses |
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| 121 | ! where (berg_grid%calving==0.) berg_grid%stored_ice(:,:,jn)=0. |
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| 122 | !end do |
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| 123 | DO jj = 2, jpjm1 |
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| 124 | DO ji = 2, jpim1 |
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| 125 | IF( berg_grid%calving(ji,jj) /= 0._wp ) & ! Need units of J |
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| 126 | berg_grid%stored_heat(ji,jj) = SUM( berg_grid%stored_ice(ji,jj,:) ) * & ! initial stored ice in kg |
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| 127 | berg_grid%calving_hflx(ji,jj) * e1e2t(ji,jj) / & ! J/s/m2 x m^2 = J/s |
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| 128 | berg_grid%calving(ji,jj) ! /calving in kg/s |
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| 129 | END DO |
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| 130 | END DO |
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| 131 | ENDIF |
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| 132 | |
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| 133 | ! assume that all calving flux must be distributed even if distribution array does not sum |
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| 134 | ! to one - this may not be what is intended, but it's what you've got |
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| 135 | DO jj = 1,jpj |
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| 136 | DO ji = 1,jpi |
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| 137 | imx = berg_grid%maxclass(ji,jj) |
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| 138 | zdist = SUM( rn_distribution(1:nclasses) ) / SUM( rn_distribution(1:imx) ) |
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| 139 | DO jn = 1, imx |
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| 140 | berg_grid%stored_ice(ji,jj,jn) = berg_grid%stored_ice(ji,jj,jn) + & |
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| 141 | berg_dt * berg_grid%calving(ji,jj) * rn_distribution(jn) * zdist |
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| 142 | END DO |
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| 143 | END DO |
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| 144 | END DO |
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| 145 | |
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| 146 | ! before changing the calving, save the amount we're about to use and do budget |
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| 147 | zcalving_used = SUM( berg_grid%calving(:,:) ) |
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| 148 | berg_grid%tmp(:,:) = berg_dt * berg_grid%calving_hflx(:,:) * e1e2t(:,:) * tmask_i(:,:) |
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| 149 | berg_grid%stored_heat (:,:) = berg_grid%stored_heat (:,:) + berg_grid%tmp(:,:) |
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| 150 | CALL icb_dia_income( kt, zcalving_used, berg_grid%tmp ) |
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| 151 | ! |
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[11738] | 152 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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[3614] | 153 | END SUBROUTINE icb_clv_flx |
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| 154 | |
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| 155 | SUBROUTINE icb_clv() |
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| 156 | !!---------------------------------------------------------------------- |
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| 157 | !! *** ROUTINE icb_clv *** |
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| 158 | !! |
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| 159 | !! ** Purpose : This routine takes a stored ice field and calves to the ocean, |
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| 160 | !! so the gridded array stored_ice has only non-zero entries at selected |
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| 161 | !! wet points adjacent to known land based calving points |
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| 162 | !! |
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| 163 | !! ** method : - Look at each grid point and see if there's enough for each size class to calve |
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| 164 | !! If there is, a new iceberg is calved. This happens in the order determined by |
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| 165 | !! the class definition arrays (which in the default case is smallest first) |
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| 166 | !! Note that only the non-overlapping part of the processor where icebergs are allowed |
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| 167 | !! is considered |
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| 168 | !!---------------------------------------------------------------------- |
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| 169 | INTEGER :: ji, jj, jn ! dummy loop indices |
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| 170 | INTEGER :: icnt, icntmax |
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| 171 | TYPE(iceberg) :: newberg |
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| 172 | TYPE(point) :: newpt |
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| 173 | REAL(wp) :: zday, zcalved_to_berg, zheat_to_berg |
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[11738] | 174 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 175 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 176 | REAL(KIND=jprb) :: zhook_handle |
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| 177 | |
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| 178 | CHARACTER(LEN=*), PARAMETER :: RoutineName='ICB_CLV' |
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| 179 | |
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| 180 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 181 | |
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[3614] | 182 | !!---------------------------------------------------------------------- |
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| 183 | ! |
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| 184 | icntmax = 0 |
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| 185 | zday = REAL(nday_year,wp) + REAL(nsec_day,wp)/86400.0_wp |
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| 186 | ! |
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| 187 | DO jn = 1, nclasses |
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| 188 | DO jj = nicbdj, nicbej |
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| 189 | DO ji = nicbdi, nicbei |
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| 190 | ! |
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| 191 | icnt = 0 |
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| 192 | ! |
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| 193 | DO WHILE (berg_grid%stored_ice(ji,jj,jn) >= rn_initial_mass(jn) * rn_mass_scaling(jn) ) |
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| 194 | ! |
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| 195 | newpt%lon = glamt(ji,jj) ! at t-point (centre of the cell) |
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| 196 | newpt%lat = gphit(ji,jj) |
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| 197 | newpt%xi = REAL( mig(ji), wp ) |
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| 198 | newpt%yj = REAL( mjg(jj), wp ) |
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| 199 | ! |
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| 200 | newpt%uvel = 0._wp ! initially at rest |
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| 201 | newpt%vvel = 0._wp |
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| 202 | ! ! set berg characteristics |
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| 203 | newpt%mass = rn_initial_mass (jn) |
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| 204 | newpt%thickness = rn_initial_thickness(jn) |
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| 205 | newpt%width = first_width (jn) |
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| 206 | newpt%length = first_length (jn) |
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| 207 | newberg%mass_scaling = rn_mass_scaling (jn) |
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| 208 | newpt%mass_of_bits = 0._wp ! no bergy |
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| 209 | ! |
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| 210 | newpt%year = nyear |
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| 211 | newpt%day = zday |
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| 212 | newpt%heat_density = berg_grid%stored_heat(ji,jj) / berg_grid%stored_ice(ji,jj,jn) ! This is in J/kg |
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| 213 | ! |
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| 214 | CALL icb_utl_incr() |
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| 215 | newberg%number(:) = num_bergs(:) |
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| 216 | ! |
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| 217 | CALL icb_utl_add( newberg, newpt ) |
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| 218 | ! |
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| 219 | zcalved_to_berg = rn_initial_mass(jn) * rn_mass_scaling(jn) ! Units of kg |
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| 220 | ! ! Heat content |
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| 221 | zheat_to_berg = zcalved_to_berg * newpt%heat_density ! Units of J |
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| 222 | berg_grid%stored_heat(ji,jj) = berg_grid%stored_heat(ji,jj) - zheat_to_berg |
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| 223 | ! ! Stored mass |
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| 224 | berg_grid%stored_ice(ji,jj,jn) = berg_grid%stored_ice(ji,jj,jn) - zcalved_to_berg |
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| 225 | ! |
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| 226 | icnt = icnt + 1 |
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| 227 | ! |
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| 228 | CALL icb_dia_calve(ji, jj, jn, zcalved_to_berg, zheat_to_berg ) |
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| 229 | END DO |
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| 230 | icntmax = MAX( icntmax, icnt ) |
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| 231 | END DO |
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| 232 | END DO |
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| 233 | END DO |
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| 234 | ! |
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| 235 | DO jn = 1,nclasses |
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| 236 | CALL lbc_lnk( berg_grid%stored_ice(:,:,jn), 'T', 1._wp ) |
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| 237 | END DO |
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| 238 | CALL lbc_lnk( berg_grid%stored_heat, 'T', 1._wp ) |
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| 239 | ! |
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| 240 | IF( nn_verbose_level > 0 .AND. icntmax > 1 ) WRITE(numicb,*) 'icb_clv: icnt=', icnt,' on', narea |
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| 241 | ! |
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[11738] | 242 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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[3614] | 243 | END SUBROUTINE icb_clv |
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| 244 | |
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| 245 | !!====================================================================== |
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| 246 | END MODULE icbclv |
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