| 1 | MODULE icestp_2 |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE icestp_2 *** |
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| 4 | !! Sea-Ice model : LIM Sea ice model time-stepping |
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| 5 | !!====================================================================== |
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| 6 | !! History : 1.0 ! 99-11 (M. Imbard) Original code |
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| 7 | !! ! 01-03 (D. Ludicone, E. Durand, G. Madec) free surf. |
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| 8 | !! 2.0 ! 02-09 (G. Madec, C. Ethe) F90: Free form and module |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | #if defined key_lim2 |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | !! 'key_lim2' : LIM 2.0 sea-ice model |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | !! ice_stp_2 : sea-ice model time-stepping |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE dom_oce |
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| 18 | USE oce ! dynamics and tracers variables |
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| 19 | USE in_out_manager |
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| 20 | USE ice_oce ! ice variables |
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| 21 | USE flx_oce ! forcings variables |
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| 22 | USE dom_ice_2 |
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| 23 | USE cpl_oce |
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| 24 | USE daymod |
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| 25 | USE phycst ! Define parameters for the routines |
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| 26 | USE taumod |
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| 27 | USE ice_2 |
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| 28 | USE ocesbc |
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| 29 | USE lbclnk |
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| 30 | USE limdyn_2 |
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| 31 | USE limtrp_2 |
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| 32 | USE limthd_2 |
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| 33 | USE limflx_2 |
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| 34 | USE limdia_2 |
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| 35 | USE limwri_2 |
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| 36 | USE limrst_2 |
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| 37 | USE limdmp_2 ! Ice damping |
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| 38 | USE prtctl ! Print control |
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| 39 | |
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| 40 | IMPLICIT NONE |
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| 41 | PRIVATE |
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| 42 | |
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| 43 | PUBLIC ice_stp_2 ! called by step.F90 |
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| 44 | |
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| 45 | !! * Substitutions |
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| 46 | # include "domzgr_substitute.h90" |
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| 47 | # include "vectopt_loop_substitute.h90" |
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| 48 | !!----------------------------------------------------- |
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| 49 | !! LIM 2.0, UCL-LOCEAN-IPSL (2005) |
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| 50 | !! $Header$ |
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| 51 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 52 | !!----------------------------------------------------- |
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| 53 | |
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| 54 | CONTAINS |
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| 55 | |
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| 56 | SUBROUTINE ice_stp_2 ( kt ) |
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| 57 | !!--------------------------------------------------------------------- |
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| 58 | !! *** ROUTINE ice_stp_2 *** |
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| 59 | !! |
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| 60 | !! ** Purpose : Louvain la Neuve Sea Ice Model time stepping |
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| 61 | !! |
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| 62 | !! ** Action : - call the ice dynamics routine |
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| 63 | !! - call the ice advection/diffusion routine |
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| 64 | !! - call the ice thermodynamics routine |
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| 65 | !! - call the routine that computes mass and |
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| 66 | !! heat fluxes at the ice/ocean interface |
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| 67 | !! - save the outputs |
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| 68 | !! - save the outputs for restart when necessary |
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| 69 | !!---------------------------------------------------------------------- |
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| 70 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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| 71 | |
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| 72 | INTEGER :: ji, jj ! dummy loop indices |
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| 73 | REAL(wp), DIMENSION(jpi,jpj) :: zsss_io, zsss2_io, zsss3_io ! tempory workspaces |
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| 74 | !!---------------------------------------------------------------------- |
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| 75 | |
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| 76 | IF( kt == nit000 ) THEN |
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| 77 | IF( lk_cpl ) THEN |
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| 78 | IF(lwp) WRITE(numout,*) |
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| 79 | IF(lwp) WRITE(numout,*) 'ice_stp : Louvain la Neuve Ice Model (LIM)' |
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| 80 | IF(lwp) WRITE(numout,*) '~~~~~~~ coupled case' |
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| 81 | ELSE |
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| 82 | IF(lwp) WRITE(numout,*) |
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| 83 | IF(lwp) WRITE(numout,*) 'ice_stp : Louvain la Neuve Ice Model (LIM)' |
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| 84 | IF(lwp) WRITE(numout,*) '~~~~~~~ forced case using bulk formulea' |
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| 85 | ENDIF |
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| 86 | ! Initialize fluxes fields |
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| 87 | gtaux(:,:) = 0.e0 |
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| 88 | gtauy(:,:) = 0.e0 |
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| 89 | ENDIF |
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| 90 | |
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| 91 | ! Temperature , salinity and horizonta wind |
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| 92 | ! sst_io and sss_io, u_io and v_io are initialized at nit000 in limistate.F90 (or limrst.F90) with : |
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| 93 | ! sst_io = sst_io + (nfice - 1) * (tn(:,:,1)+rt0 ) |
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| 94 | ! sss_io = sss_io + (nfice - 1) * sn(:,:,1) |
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| 95 | ! u_io = u_io + (nfice - 1) * 0.5 * ( un(ji-1,jj ,1) + un(ji-1,jj-1,1) ) |
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| 96 | ! v_io = v_io + (nfice - 1) * 0.5 * ( vn(ji ,jj-1,1) + vn(ji-1,jj-1,1) ) |
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| 97 | ! cumulate fields |
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| 98 | ! |
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| 99 | sst_io(:,:) = sst_io(:,:) + tn(:,:,1) + rt0 |
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| 100 | sss_io(:,:) = sss_io(:,:) + sn(:,:,1) |
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| 101 | |
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| 102 | |
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| 103 | ! vectors at F-point |
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| 104 | DO jj = 2, jpj |
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| 105 | DO ji = fs_2, jpi ! vector opt. |
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| 106 | u_io(ji,jj) = u_io(ji,jj) + 0.5 * ( un(ji-1,jj ,1) + un(ji-1,jj-1,1) ) |
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| 107 | v_io(ji,jj) = v_io(ji,jj) + 0.5 * ( vn(ji ,jj-1,1) + vn(ji-1,jj-1,1) ) |
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| 108 | END DO |
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| 109 | END DO |
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| 110 | |
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| 111 | |
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| 112 | IF( MOD( kt-1, nfice ) == 0 ) THEN |
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| 113 | |
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| 114 | ! The LIM model is going to be call |
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| 115 | sst_io(:,:) = sst_io(:,:) / FLOAT( nfice ) * tmask(:,:,1) |
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| 116 | sss_io(:,:) = sss_io(:,:) / FLOAT( nfice ) |
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| 117 | |
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| 118 | ! stress from ocean U- and V-points to ice U,V point |
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| 119 | DO jj = 2, jpj |
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| 120 | DO ji = fs_2, jpi ! vector opt. |
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| 121 | gtaux(ji,jj) = 0.5 * ( taux(ji-1,jj ) + taux(ji-1,jj-1) ) |
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| 122 | gtauy(ji,jj) = 0.5 * ( tauy(ji ,jj-1) + tauy(ji-1,jj-1) ) |
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| 123 | u_io (ji,jj) = u_io(ji,jj) / FLOAT( nfice ) |
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| 124 | v_io (ji,jj) = v_io(ji,jj) / FLOAT( nfice ) |
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| 125 | END DO |
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| 126 | END DO |
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| 127 | |
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| 128 | ! lateral boundary condition |
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| 129 | CALL lbc_lnk( gtaux(:,:), 'I', -1. ) ! I-point (i.e. ice U-V point) |
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| 130 | CALL lbc_lnk( gtauy(:,:), 'I', -1. ) ! I-point (i.e. ice U-V point) |
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| 131 | CALL lbc_lnk( u_io (:,:), 'I', -1. ) ! I-point (i.e. ice U-V point) |
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| 132 | CALL lbc_lnk( v_io (:,:), 'I', -1. ) ! I-point (i.e. ice U-V point) |
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| 133 | |
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| 134 | !!gmbug in the ocean freezing point computed as : |
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| 135 | !!gm fzptn (ji,jj) = ( -0.0575 + 1.710523e-3 * SQRT( sn(ji,jj,1) ) & |
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| 136 | !!gm - 2.154996e-4 * sn(ji,jj,1) ) * sn(ji,jj,1) !! & |
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| 137 | !!gm !! - 7.53e-4 * pressure |
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| 138 | !!gm |
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| 139 | !!gm!bug this is much more accurate and efficient computation |
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| 140 | !!gm ************************************************** |
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| 141 | !!gm freezing point from unesco: |
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| 142 | !!gm real function tf(s,p) |
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| 143 | !!gm function to compute the freezing point of seawater |
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| 144 | !!gm |
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| 145 | !!gm reference: unesco tech. papers in the marine science no. 28. 1978 |
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| 146 | !!gm eighth report jpots |
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| 147 | !!gm annex 6 freezing point of seawater f.j. millero pp.29-35. |
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| 148 | !!gm |
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| 149 | !!gm units: |
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| 150 | !!gm pressure p decibars |
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| 151 | !!gm salinity s pss-78 |
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| 152 | !!gm temperature tf degrees celsius |
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| 153 | !!gm freezing pt. |
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| 154 | !!gm************************************************************ |
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| 155 | !!gm checkvalue: tf= -2.588567 deg. c for s=40.0, p=500. decibars |
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| 156 | !!gm tf=(-.0575+1.710523e-3*sqrt(abs(s))-2.154996e-4*s)*s-7.53e-4*p |
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| 157 | !!gm return |
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| 158 | !!gm end |
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| 159 | !!gm!bug |
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| 160 | |
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| 161 | |
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| 162 | !!gm DO jj = 1, jpj |
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| 163 | !!gm DO ji = 1, jpi |
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| 164 | !!gm tfu(ji,jj) = ( rt0 + ( - 0.0575 & |
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| 165 | !!gm & + 1.710523e-3 * SQRT( sss_io(ji,jj) ) & |
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| 166 | !!gm & - 2.154996e-4 * sss_io(ji,jj) ) * sss_io(ji,jj) ) * tms(ji,jj) |
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| 167 | !!gm END DO |
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| 168 | !!gm END DO |
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| 169 | !!gm |
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| 170 | zsss_io (:,:) = SQRT( sss_io(:,:) ) |
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| 171 | zsss2_io(:,:) = sss_io(:,:) * sss_io(:,:) |
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| 172 | zsss3_io(:,:) = zsss_io(:,:) * zsss_io(:,:) * zsss_io(:,:) |
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| 173 | |
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| 174 | DO jj = 1, jpj |
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| 175 | DO ji = 1, jpi |
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| 176 | tfu(ji,jj) = ABS ( rt0 - 0.0575 * sss_io(ji,jj) & |
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| 177 | & + 1.710523e-03 * zsss3_io(ji,jj) & |
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| 178 | & - 2.154996e-04 * zsss2_io(ji,jj) ) * tms(ji,jj) |
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| 179 | END DO |
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| 180 | END DO |
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| 181 | |
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| 182 | |
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| 183 | |
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| 184 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 185 | CALL prt_ctl_info('Ice Forcings ') |
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| 186 | CALL prt_ctl(tab2d_1=qsr_oce ,clinfo1=' qsr_oce : ', tab2d_2=qsr_ice , clinfo2=' qsr_ice : ') |
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| 187 | CALL prt_ctl(tab2d_1=qnsr_oce,clinfo1=' qnsr_oce : ', tab2d_2=qnsr_ice, clinfo2=' qnsr_ice : ') |
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| 188 | CALL prt_ctl(tab2d_1=evap ,clinfo1=' evap : ') |
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| 189 | CALL prt_ctl(tab2d_1=tprecip ,clinfo1=' precip : ', tab2d_2=sprecip , clinfo2=' Snow : ') |
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| 190 | CALL prt_ctl(tab2d_1=gtaux ,clinfo1=' u-stress : ', tab2d_2=gtauy , clinfo2=' v-stress : ') |
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| 191 | CALL prt_ctl(tab2d_1=sst_io ,clinfo1=' sst : ', tab2d_2=sss_io , clinfo2=' sss : ') |
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| 192 | CALL prt_ctl(tab2d_1=u_io ,clinfo1=' u_io : ', tab2d_2=v_io , clinfo2=' v_io : ') |
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| 193 | CALL prt_ctl(tab2d_1=hsnif ,clinfo1=' hsnif 1 : ', tab2d_2=hicif , clinfo2=' hicif : ') |
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| 194 | CALL prt_ctl(tab2d_1=frld ,clinfo1=' frld 1 : ', tab2d_2=sist , clinfo2=' sist : ') |
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| 195 | ENDIF |
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| 196 | |
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| 197 | ! !-----------------------! |
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| 198 | CALL lim_rst_opn_2( kt ) ! Open Ice restart file ! |
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| 199 | ! !-----------------------! |
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| 200 | |
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| 201 | ! !--------------! |
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| 202 | CALL lim_dyn_2( kt ) ! Ice dynamics ! ( rheology/dynamics ) |
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| 203 | ! !--------------! |
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| 204 | IF(ln_ctl) THEN |
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| 205 | CALL prt_ctl(tab2d_1=hsnif ,clinfo1=' hsnif 2 : ', tab2d_2=hicif , clinfo2=' hicif : ') |
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| 206 | CALL prt_ctl(tab2d_1=frld ,clinfo1=' frld 2 : ', tab2d_2=sist , clinfo2=' sist : ') |
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| 207 | ENDIF |
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| 208 | |
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| 209 | |
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| 210 | ! !---------------! |
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| 211 | CALL lim_trp_2( kt ) ! Ice transport ! ( Advection/diffusion ) |
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| 212 | ! !---------------! |
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| 213 | IF(ln_ctl) THEN |
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| 214 | CALL prt_ctl(tab2d_1=hsnif ,clinfo1=' hsnif 3 : ', tab2d_2=hicif , clinfo2=' hicif : ') |
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| 215 | CALL prt_ctl(tab2d_1=frld ,clinfo1=' frld 3 : ', tab2d_2=sist , clinfo2=' sist : ') |
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| 216 | ENDIF |
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| 217 | |
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| 218 | ! !-------------! |
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| 219 | IF( ln_limdmp ) THEN ! Ice damping ! |
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| 220 | ! !-------------! |
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| 221 | #if defined key_agrif |
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| 222 | IF( Agrif_Root() ) CALL lim_dmp_2(kt) |
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| 223 | #else |
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| 224 | CALL lim_dmp_2(kt) |
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| 225 | #endif |
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| 226 | ENDIF |
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| 227 | ! !--------------------! |
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| 228 | CALL lim_thd_2( kt ) ! Ice thermodynamics ! |
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| 229 | ! !--------------------! |
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| 230 | IF(ln_ctl) THEN |
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| 231 | CALL prt_ctl(tab2d_1=hsnif ,clinfo1=' hsnif 4 : ', tab2d_2=hicif , clinfo2=' hicif : ') |
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| 232 | CALL prt_ctl(tab2d_1=frld ,clinfo1=' frld 4 : ', tab2d_2=sist , clinfo2=' sist : ') |
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| 233 | ENDIF |
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| 234 | |
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| 235 | |
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| 236 | ! Mass and heat fluxes from ice to ocean |
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| 237 | ! !------------------------------! |
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| 238 | CALL lim_flx_2 ! Ice/Ocean Mass & Heat fluxes ! |
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| 239 | ! !------------------------------! |
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| 240 | |
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| 241 | IF( MOD( kt + nfice -1, ninfo ) == 0 .OR. ntmoy == 1 ) THEN !-----------------! |
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| 242 | CALL lim_dia_2( kt ) ! Ice Diagnostics ! |
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| 243 | ENDIF !-----------------! |
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| 244 | |
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| 245 | ! !-------------! |
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| 246 | CALL lim_wri_2( kt ) ! Ice outputs ! |
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| 247 | ! !-------------! |
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| 248 | |
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| 249 | ! !------------------------! |
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| 250 | IF( lrst_ice ) CALL lim_rst_write_2( kt ) ! Write Ice restart file ! |
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| 251 | ! !------------------------! |
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| 252 | |
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| 253 | ! Re-initialization of forcings |
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| 254 | qsr_oce (:,:) = 0.e0 |
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| 255 | qsr_ice (:,:) = 0.e0 |
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| 256 | qnsr_oce(:,:) = 0.e0 |
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| 257 | qnsr_ice(:,:) = 0.e0 |
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| 258 | dqns_ice(:,:) = 0.e0 |
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| 259 | tprecip (:,:) = 0.e0 |
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| 260 | sprecip (:,:) = 0.e0 |
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| 261 | fr1_i0 (:,:) = 0.e0 |
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| 262 | fr2_i0 (:,:) = 0.e0 |
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| 263 | evap (:,:) = 0.e0 |
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| 264 | #if defined key_coupled |
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| 265 | rrunoff (:,:) = 0.e0 |
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| 266 | calving (:,:) = 0.e0 |
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| 267 | #else |
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| 268 | qla_ice (:,:) = 0.e0 |
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| 269 | dqla_ice(:,:) = 0.e0 |
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| 270 | #endif |
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| 271 | ENDIF |
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| 272 | ! |
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| 273 | END SUBROUTINE ice_stp_2 |
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| 274 | |
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| 275 | #else |
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| 276 | !!---------------------------------------------------------------------- |
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| 277 | !! Default option Dummy module NO LIM 2.0 sea-ice model |
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| 278 | !!---------------------------------------------------------------------- |
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| 279 | CONTAINS |
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| 280 | SUBROUTINE ice_stp_2 ( kt ) ! Dummy routine |
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| 281 | WRITE(*,*) 'ice_stp_2: You should not have seen this print! error?', kt |
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| 282 | END SUBROUTINE ice_stp_2 |
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| 283 | #endif |
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| 284 | |
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| 285 | !!====================================================================== |
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| 286 | END MODULE icestp_2 |
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