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