[825] | 1 | MODULE limthd_ent |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE limthd_ent *** |
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| 4 | !! Redistribution of Enthalpy in the ice |
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| 5 | !! on the new vertical grid |
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| 6 | !! after vertical growth/decay |
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| 7 | !!====================================================================== |
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[2715] | 8 | !! History : LIM ! 2003-05 (M. Vancoppenolle) Original code in 1D |
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| 9 | !! ! 2005-07 (M. Vancoppenolle) 3D version |
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| 10 | !! ! 2006-11 (X. Fettweis) Vectorized |
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| 11 | !! 3.0 ! 2008-03 (M. Vancoppenolle) Energy conservation and clean code |
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[4688] | 12 | !! 3.4 ! 2011-02 (G. Madec) dynamical allocation |
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| 13 | !! - ! 2014-05 (C. Rousset) complete rewriting |
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[2715] | 14 | !!---------------------------------------------------------------------- |
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[2528] | 15 | #if defined key_lim3 |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | !! 'key_lim3' LIM3 sea-ice model |
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| 18 | !!---------------------------------------------------------------------- |
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[3625] | 19 | !! lim_thd_ent : ice redistribution of enthalpy |
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[2528] | 20 | !!---------------------------------------------------------------------- |
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[3625] | 21 | USE par_oce ! ocean parameters |
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| 22 | USE dom_oce ! domain variables |
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| 23 | USE domain ! |
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| 24 | USE phycst ! physical constants |
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| 25 | USE ice ! LIM variables |
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| 26 | USE thd_ice ! LIM thermodynamics |
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| 27 | USE limvar ! LIM variables |
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[8378] | 28 | ! |
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[3625] | 29 | USE in_out_manager ! I/O manager |
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| 30 | USE lib_mpp ! MPP library |
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| 31 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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[825] | 32 | |
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| 33 | IMPLICIT NONE |
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| 34 | PRIVATE |
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| 35 | |
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[4688] | 36 | PUBLIC lim_thd_ent ! called by limthd and limthd_lac |
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[825] | 37 | |
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| 38 | !!---------------------------------------------------------------------- |
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[4161] | 39 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
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[1156] | 40 | !! $Id$ |
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[2528] | 41 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[825] | 42 | !!---------------------------------------------------------------------- |
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| 43 | CONTAINS |
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[3294] | 44 | |
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[8342] | 45 | SUBROUTINE lim_thd_ent( qnew ) |
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[825] | 46 | !!------------------------------------------------------------------- |
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| 47 | !! *** ROUTINE lim_thd_ent *** |
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| 48 | !! |
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| 49 | !! ** Purpose : |
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[4688] | 50 | !! This routine computes new vertical grids in the ice, |
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| 51 | !! and consistently redistributes temperatures. |
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[825] | 52 | !! Redistribution is made so as to ensure to energy conservation |
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| 53 | !! |
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| 54 | !! |
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| 55 | !! ** Method : linear conservative remapping |
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| 56 | !! |
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[4688] | 57 | !! ** Steps : 1) cumulative integrals of old enthalpies/thicknesses |
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| 58 | !! 2) linear remapping on the new layers |
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[825] | 59 | !! |
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[4688] | 60 | !! ------------ cum0(0) ------------- cum1(0) |
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| 61 | !! NEW ------------- |
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| 62 | !! ------------ cum0(1) ==> ------------- |
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| 63 | !! ... ------------- |
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| 64 | !! ------------ ------------- |
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| 65 | !! ------------ cum0(nlay_i+2) ------------- cum1(nlay_i) |
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| 66 | !! |
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| 67 | !! |
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[2715] | 68 | !! References : Bitz & Lipscomb, JGR 99; Vancoppenolle et al., GRL, 2005 |
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| 69 | !!------------------------------------------------------------------- |
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[4688] | 70 | REAL(wp), INTENT(inout), DIMENSION(:,:) :: qnew ! new enthlapies (J.m-3, remapped) |
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[825] | 71 | |
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[4688] | 72 | INTEGER :: ji ! dummy loop indices |
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| 73 | INTEGER :: jk0, jk1 ! old/new layer indices |
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[2715] | 74 | ! |
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[8373] | 75 | REAL(wp), DIMENSION(jpij,0:nlay_i+2) :: zeh_cum0, zh_cum0 ! old cumulative enthlapies and layers interfaces |
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| 76 | REAL(wp), DIMENSION(jpij,0:nlay_i) :: zeh_cum1, zh_cum1 ! new cumulative enthlapies and layers interfaces |
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| 77 | REAL(wp), DIMENSION(jpij) :: zhnew ! new layers thicknesses |
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[2715] | 78 | !!------------------------------------------------------------------- |
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[825] | 79 | |
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[4688] | 80 | !-------------------------------------------------------------------------- |
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[5123] | 81 | ! 1) Cumulative integral of old enthalpy * thickness and layers interfaces |
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[4688] | 82 | !-------------------------------------------------------------------------- |
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[8325] | 83 | zeh_cum0(:,0:nlay_i+2) = 0._wp |
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[4688] | 84 | zh_cum0 (:,0:nlay_i+2) = 0._wp |
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| 85 | DO jk0 = 1, nlay_i+2 |
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[8342] | 86 | DO ji = 1, nidx |
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[8325] | 87 | zeh_cum0(ji,jk0) = zeh_cum0(ji,jk0-1) + eh_i_old(ji,jk0-1) |
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[4688] | 88 | zh_cum0 (ji,jk0) = zh_cum0 (ji,jk0-1) + h_i_old (ji,jk0-1) |
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| 89 | ENDDO |
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[825] | 90 | ENDDO |
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| 91 | |
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[4688] | 92 | !------------------------------------ |
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| 93 | ! 2) Interpolation on the new layers |
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| 94 | !------------------------------------ |
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| 95 | ! new layer thickesses |
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[8342] | 96 | DO ji = 1, nidx |
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[5123] | 97 | zhnew(ji) = SUM( h_i_old(ji,0:nlay_i+1) ) * r1_nlay_i |
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[825] | 98 | ENDDO |
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| 99 | |
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[4688] | 100 | ! new layers interfaces |
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| 101 | zh_cum1(:,0:nlay_i) = 0._wp |
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| 102 | DO jk1 = 1, nlay_i |
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[8342] | 103 | DO ji = 1, nidx |
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[4688] | 104 | zh_cum1(ji,jk1) = zh_cum1(ji,jk1-1) + zhnew(ji) |
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| 105 | ENDDO |
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[825] | 106 | ENDDO |
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| 107 | |
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[8325] | 108 | zeh_cum1(:,0:nlay_i) = 0._wp |
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[4688] | 109 | ! new cumulative q*h => linear interpolation |
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| 110 | DO jk0 = 1, nlay_i+1 |
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| 111 | DO jk1 = 1, nlay_i-1 |
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[8342] | 112 | DO ji = 1, nidx |
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[4688] | 113 | IF( zh_cum1(ji,jk1) <= zh_cum0(ji,jk0) .AND. zh_cum1(ji,jk1) > zh_cum0(ji,jk0-1) ) THEN |
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[8325] | 114 | zeh_cum1(ji,jk1) = ( zeh_cum0(ji,jk0-1) * ( zh_cum0(ji,jk0) - zh_cum1(ji,jk1 ) ) + & |
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| 115 | & zeh_cum0(ji,jk0 ) * ( zh_cum1(ji,jk1) - zh_cum0(ji,jk0-1) ) ) & |
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[4688] | 116 | & / ( zh_cum0(ji,jk0) - zh_cum0(ji,jk0-1) ) |
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| 117 | ENDIF |
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| 118 | ENDDO |
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| 119 | ENDDO |
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| 120 | ENDDO |
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| 121 | ! to ensure that total heat content is strictly conserved, set: |
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[8325] | 122 | zeh_cum1(:,nlay_i) = zeh_cum0(:,nlay_i+2) |
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[825] | 123 | |
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[4688] | 124 | ! new enthalpies |
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| 125 | DO jk1 = 1, nlay_i |
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[8342] | 126 | DO ji = 1, nidx |
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[5134] | 127 | rswitch = MAX( 0._wp , SIGN( 1._wp , zhnew(ji) - epsi20 ) ) |
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[8325] | 128 | qnew(ji,jk1) = rswitch * ( zeh_cum1(ji,jk1) - zeh_cum1(ji,jk1-1) ) / MAX( zhnew(ji), epsi20 ) |
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[4688] | 129 | ENDDO |
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| 130 | ENDDO |
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[825] | 131 | |
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[4688] | 132 | ! --- diag error on heat remapping --- ! |
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[8325] | 133 | ! comment: if input h_i_old and eh_i_old are already multiplied by a_i (as in limthd_lac), |
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[4688] | 134 | ! then we should not (* a_i) again but not important since this is just to check that remap error is ~0 |
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[8342] | 135 | DO ji = 1, nidx |
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[4872] | 136 | hfx_err_rem_1d(ji) = hfx_err_rem_1d(ji) + a_i_1d(ji) * r1_rdtice * & |
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[8325] | 137 | & ( SUM( qnew(ji,1:nlay_i) ) * zhnew(ji) - SUM( eh_i_old(ji,0:nlay_i+1) ) ) |
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[2715] | 138 | END DO |
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[4688] | 139 | |
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[921] | 140 | END SUBROUTINE lim_thd_ent |
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[825] | 141 | |
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| 142 | #else |
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[2715] | 143 | !!---------------------------------------------------------------------- |
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| 144 | !! Default option NO LIM3 sea-ice model |
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| 145 | !!---------------------------------------------------------------------- |
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[825] | 146 | CONTAINS |
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| 147 | SUBROUTINE lim_thd_ent ! Empty routine |
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| 148 | END SUBROUTINE lim_thd_ent |
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| 149 | #endif |
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[2715] | 150 | |
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| 151 | !!====================================================================== |
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[921] | 152 | END MODULE limthd_ent |
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