| [8586] | 1 | MODULE icedyn |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE icedyn *** |
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| 4 | !! Sea-Ice dynamics : master routine for sea ice dynamics |
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| 5 | !!====================================================================== |
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| [9604] | 6 | !! history : 4.0 ! 2018 (C. Rousset) original code SI3 [aka Sea Ice cube] |
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| [8586] | 7 | !!---------------------------------------------------------------------- |
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| [9570] | 8 | #if defined key_si3 |
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| [8586] | 9 | !!---------------------------------------------------------------------- |
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| [9570] | 10 | !! 'key_si3' SI3 sea-ice model |
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| [8586] | 11 | !!---------------------------------------------------------------------- |
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| 12 | !! ice_dyn : dynamics of sea ice |
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| 13 | !! ice_dyn_init : initialization and namelist read |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE phycst ! physical constants |
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| 16 | USE dom_oce ! ocean space and time domain |
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| 17 | USE ice ! sea-ice: variables |
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| 18 | USE icedyn_rhg ! sea-ice: rheology |
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| 19 | USE icedyn_adv ! sea-ice: advection |
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| 20 | USE icedyn_rdgrft ! sea-ice: ridging/rafting |
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| 21 | USE icecor ! sea-ice: corrections |
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| 22 | USE icevar ! sea-ice: operations |
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| [10413] | 23 | USE icectl ! sea-ice: control prints |
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| [8586] | 24 | ! |
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| 25 | USE in_out_manager ! I/O manager |
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| 26 | USE iom ! I/O manager library |
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| 27 | USE lib_mpp ! MPP library |
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| 28 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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| 29 | USE lbclnk ! lateral boundary conditions (or mpp links) |
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| 30 | USE timing ! Timing |
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| 31 | |
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| 32 | IMPLICIT NONE |
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| 33 | PRIVATE |
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| 34 | |
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| 35 | PUBLIC ice_dyn ! called by icestp.F90 |
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| 36 | PUBLIC ice_dyn_init ! called by icestp.F90 |
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| 37 | |
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| 38 | INTEGER :: nice_dyn ! choice of the type of dynamics |
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| 39 | ! ! associated indices: |
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| [10413] | 40 | INTEGER, PARAMETER :: np_dynALL = 1 ! full ice dynamics (rheology + advection + ridging/rafting + correction) |
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| [9076] | 41 | INTEGER, PARAMETER :: np_dynRHGADV = 2 ! pure dynamics (rheology + advection) |
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| [10413] | 42 | INTEGER, PARAMETER :: np_dynADV1D = 3 ! only advection 1D - test case from Schar & Smolarkiewicz 1996 |
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| 43 | INTEGER, PARAMETER :: np_dynADV2D = 4 ! only advection 2D w prescribed vel.(rn_uvice + advection) |
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| [8586] | 44 | ! |
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| 45 | ! ** namelist (namdyn) ** |
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| [10413] | 46 | LOGICAL :: ln_dynALL ! full ice dynamics (rheology + advection + ridging/rafting + correction) |
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| 47 | LOGICAL :: ln_dynRHGADV ! no ridge/raft & no corrections (rheology + advection) |
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| 48 | LOGICAL :: ln_dynADV1D ! only advection in 1D w ice convergence (test case from Schar & Smolarkiewicz 1996) |
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| 49 | LOGICAL :: ln_dynADV2D ! only advection in 2D w prescribed vel. (rn_uvice + advection) |
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| 50 | REAL(wp) :: rn_uice ! prescribed u-vel (case np_dynADV1D & np_dynADV2D) |
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| 51 | REAL(wp) :: rn_vice ! prescribed v-vel (case np_dynADV1D & np_dynADV2D) |
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| [8586] | 52 | |
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| 53 | !! * Substitutions |
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| [12377] | 54 | # include "do_loop_substitute.h90" |
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| [8586] | 55 | !!---------------------------------------------------------------------- |
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| [9598] | 56 | !! NEMO/ICE 4.0 , NEMO Consortium (2018) |
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| [10069] | 57 | !! $Id$ |
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| [10413] | 58 | !! Software governed by the CeCILL licence (./LICENSE) |
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| [8586] | 59 | !!---------------------------------------------------------------------- |
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| 60 | CONTAINS |
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| 61 | |
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| [12377] | 62 | SUBROUTINE ice_dyn( kt, Kmm ) |
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| [8586] | 63 | !!------------------------------------------------------------------- |
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| 64 | !! *** ROUTINE ice_dyn *** |
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| 65 | !! |
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| 66 | !! ** Purpose : this routine manages sea ice dynamics |
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| 67 | !! |
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| [9604] | 68 | !! ** Action : - calculation of friction in case of landfast ice |
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| 69 | !! - call ice_dyn_rhg = rheology |
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| 70 | !! - call ice_dyn_adv = advection |
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| 71 | !! - call ice_dyn_rdgrft = ridging/rafting |
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| 72 | !! - call ice_cor = corrections if fields are out of bounds |
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| [8586] | 73 | !!-------------------------------------------------------------------- |
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| 74 | INTEGER, INTENT(in) :: kt ! ice time step |
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| [12377] | 75 | INTEGER, INTENT(in) :: Kmm ! ocean time level index |
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| [8586] | 76 | !! |
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| [10911] | 77 | INTEGER :: ji, jj ! dummy loop indices |
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| [10413] | 78 | REAL(wp) :: zcoefu, zcoefv |
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| [10911] | 79 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdivu_i |
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| [8586] | 80 | !!-------------------------------------------------------------------- |
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| 81 | ! |
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| [10413] | 82 | ! controls |
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| [10538] | 83 | IF( ln_timing ) CALL timing_start('icedyn') |
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| [8586] | 84 | ! |
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| 85 | IF( kt == nit000 .AND. lwp ) THEN |
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| 86 | WRITE(numout,*) |
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| 87 | WRITE(numout,*)'ice_dyn: sea-ice dynamics' |
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| 88 | WRITE(numout,*)'~~~~~~~' |
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| 89 | ENDIF |
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| 90 | ! |
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| [10911] | 91 | ! retrieve thickness from volume for landfast param. and UMx advection scheme |
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| 92 | WHERE( a_i(:,:,:) >= epsi20 ) |
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| 93 | h_i(:,:,:) = v_i(:,:,:) / a_i_b(:,:,:) |
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| 94 | h_s(:,:,:) = v_s(:,:,:) / a_i_b(:,:,:) |
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| 95 | ELSEWHERE |
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| 96 | h_i(:,:,:) = 0._wp |
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| 97 | h_s(:,:,:) = 0._wp |
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| 98 | END WHERE |
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| [10413] | 99 | ! |
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| [10911] | 100 | WHERE( a_ip(:,:,:) >= epsi20 ) |
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| 101 | h_ip(:,:,:) = v_ip(:,:,:) / a_ip(:,:,:) |
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| [13472] | 102 | h_il(:,:,:) = v_il(:,:,:) / a_ip(:,:,:) |
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| [10911] | 103 | ELSEWHERE |
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| 104 | h_ip(:,:,:) = 0._wp |
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| [13472] | 105 | h_il(:,:,:) = 0._wp |
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| [10911] | 106 | END WHERE |
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| [8586] | 107 | ! |
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| 108 | ! |
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| [10911] | 109 | SELECT CASE( nice_dyn ) !-- Set which dynamics is running |
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| [8586] | 110 | |
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| [10413] | 111 | CASE ( np_dynALL ) !== all dynamical processes ==! |
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| [10911] | 112 | ! |
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| [12377] | 113 | CALL ice_dyn_rhg ( kt, Kmm ) ! -- rheology |
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| [10911] | 114 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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| 115 | CALL ice_dyn_rdgrft( kt ) ! -- ridging/rafting |
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| 116 | CALL ice_cor ( kt , 1 ) ! -- Corrections |
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| 117 | ! |
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| [9076] | 118 | CASE ( np_dynRHGADV ) !== no ridge/raft & no corrections ==! |
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| [10911] | 119 | ! |
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| [12377] | 120 | CALL ice_dyn_rhg ( kt, Kmm ) ! -- rheology |
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| [10911] | 121 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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| 122 | CALL Hpiling ! -- simple pile-up (replaces ridging/rafting) |
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| [10994] | 123 | CALL ice_var_zapsmall ! -- zap small areas |
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| [10911] | 124 | ! |
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| [10413] | 125 | CASE ( np_dynADV1D ) !== pure advection ==! (1D) |
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| [10911] | 126 | ! |
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| [10413] | 127 | ! --- monotonicity test from Schar & Smolarkiewicz 1996 --- ! |
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| 128 | ! CFL = 0.5 at a distance from the bound of 1/6 of the basin length |
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| 129 | ! Then for dx = 2m and dt = 1s => rn_uice = u (1/6th) = 1m/s |
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| [13295] | 130 | DO_2D( 1, 1, 1, 1 ) |
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| [13472] | 131 | zcoefu = ( REAL(jpiglo+1)*0.5_wp - REAL(ji+nimpp-1) ) / ( REAL(jpiglo+1)*0.5_wp - 1._wp ) |
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| 132 | zcoefv = ( REAL(jpjglo+1)*0.5_wp - REAL(jj+njmpp-1) ) / ( REAL(jpjglo+1)*0.5_wp - 1._wp ) |
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| 133 | u_ice(ji,jj) = rn_uice * 1.5_wp * SIGN( 1.0_wp, zcoefu ) * ABS( zcoefu ) * umask(ji,jj,1) |
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| 134 | v_ice(ji,jj) = rn_vice * 1.5_wp * SIGN( 1.0_wp, zcoefv ) * ABS( zcoefv ) * vmask(ji,jj,1) |
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| [12377] | 135 | END_2D |
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| [10413] | 136 | ! --- |
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| [10911] | 137 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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| 138 | ! |
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| [10413] | 139 | CASE ( np_dynADV2D ) !== pure advection ==! (2D w prescribed velocities) |
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| [10911] | 140 | ! |
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| [8586] | 141 | u_ice(:,:) = rn_uice * umask(:,:,1) |
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| 142 | v_ice(:,:) = rn_vice * vmask(:,:,1) |
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| [10413] | 143 | !CALL RANDOM_NUMBER(u_ice(:,:)) ; u_ice(:,:) = u_ice(:,:) * 0.1 + rn_uice * 0.9 * umask(:,:,1) |
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| 144 | !CALL RANDOM_NUMBER(v_ice(:,:)) ; v_ice(:,:) = v_ice(:,:) * 0.1 + rn_vice * 0.9 * vmask(:,:,1) |
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| 145 | ! --- |
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| [10911] | 146 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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| [8586] | 147 | |
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| 148 | END SELECT |
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| [10538] | 149 | ! |
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| [8586] | 150 | ! |
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| [10911] | 151 | ! diagnostics: divergence at T points |
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| 152 | IF( iom_use('icediv') ) THEN |
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| 153 | ! |
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| 154 | SELECT CASE( nice_dyn ) |
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| [8586] | 155 | |
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| [10911] | 156 | CASE ( np_dynADV1D , np_dynADV2D ) |
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| [9124] | 157 | |
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| [10911] | 158 | ALLOCATE( zdivu_i(jpi,jpj) ) |
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| [13295] | 159 | DO_2D( 0, 0, 0, 0 ) |
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| [12377] | 160 | zdivu_i(ji,jj) = ( e2u(ji,jj) * u_ice(ji,jj) - e2u(ji-1,jj) * u_ice(ji-1,jj) & |
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| 161 | & + e1v(ji,jj) * v_ice(ji,jj) - e1v(ji,jj-1) * v_ice(ji,jj-1) ) * r1_e1e2t(ji,jj) |
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| 162 | END_2D |
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| [13226] | 163 | CALL lbc_lnk( 'icedyn', zdivu_i, 'T', 1.0_wp ) |
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| [11536] | 164 | ! output |
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| 165 | CALL iom_put( 'icediv' , zdivu_i ) |
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| 166 | |
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| [10911] | 167 | DEALLOCATE( zdivu_i ) |
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| 168 | |
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| 169 | END SELECT |
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| 170 | ! |
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| 171 | ENDIF |
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| [8586] | 172 | ! |
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| [10538] | 173 | ! controls |
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| [10911] | 174 | IF( ln_timing ) CALL timing_stop ('icedyn') |
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| [10538] | 175 | ! |
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| [10911] | 176 | END SUBROUTINE ice_dyn |
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| [8586] | 177 | |
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| [9124] | 178 | |
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| [8586] | 179 | SUBROUTINE Hpiling |
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| 180 | !!------------------------------------------------------------------- |
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| 181 | !! *** ROUTINE Hpiling *** |
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| 182 | !! |
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| 183 | !! ** Purpose : Simple conservative piling comparable with 1-cat models |
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| 184 | !! |
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| 185 | !! ** Method : pile-up ice when no ridging/rafting |
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| 186 | !! |
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| 187 | !! ** input : a_i |
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| 188 | !!------------------------------------------------------------------- |
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| 189 | INTEGER :: jl ! dummy loop indices |
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| 190 | !!------------------------------------------------------------------- |
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| [10538] | 191 | ! controls |
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| 192 | IF( ln_icediachk ) CALL ice_cons_hsm(0, 'Hpiling', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft) ! conservation |
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| [8586] | 193 | ! |
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| 194 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
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| 195 | DO jl = 1, jpl |
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| 196 | WHERE( at_i(:,:) > epsi20 ) |
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| 197 | a_i(:,:,jl) = a_i(:,:,jl) * ( 1._wp + MIN( rn_amax_2d(:,:) - at_i(:,:) , 0._wp ) / at_i(:,:) ) |
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| 198 | END WHERE |
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| 199 | END DO |
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| [10538] | 200 | ! controls |
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| 201 | IF( ln_icediachk ) CALL ice_cons_hsm(1, 'Hpiling', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft) ! conservation |
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| [8586] | 202 | ! |
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| 203 | END SUBROUTINE Hpiling |
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| 204 | |
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| [8637] | 205 | |
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| [8586] | 206 | SUBROUTINE ice_dyn_init |
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| 207 | !!------------------------------------------------------------------- |
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| 208 | !! *** ROUTINE ice_dyn_init *** |
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| 209 | !! |
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| 210 | !! ** Purpose : Physical constants and parameters linked to the ice |
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| 211 | !! dynamics |
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| 212 | !! |
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| 213 | !! ** Method : Read the namdyn namelist and check the ice-dynamic |
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| 214 | !! parameter values called at the first timestep (nit000) |
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| 215 | !! |
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| 216 | !! ** input : Namelist namdyn |
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| 217 | !!------------------------------------------------------------------- |
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| 218 | INTEGER :: ios, ioptio ! Local integer output status for namelist read |
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| 219 | !! |
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| [10413] | 220 | NAMELIST/namdyn/ ln_dynALL, ln_dynRHGADV, ln_dynADV1D, ln_dynADV2D, rn_uice, rn_vice, & |
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| 221 | & rn_ishlat , & |
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| [13472] | 222 | & ln_landfast_L16, rn_lf_depfra, rn_lf_bfr, rn_lf_relax, rn_lf_tensile |
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| [8586] | 223 | !!------------------------------------------------------------------- |
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| 224 | ! |
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| 225 | READ ( numnam_ice_ref, namdyn, IOSTAT = ios, ERR = 901) |
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| [11536] | 226 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn in reference namelist' ) |
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| [8586] | 227 | READ ( numnam_ice_cfg, namdyn, IOSTAT = ios, ERR = 902 ) |
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| [11536] | 228 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namdyn in configuration namelist' ) |
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| [9169] | 229 | IF(lwm) WRITE( numoni, namdyn ) |
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| [8586] | 230 | ! |
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| 231 | IF(lwp) THEN ! control print |
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| 232 | WRITE(numout,*) |
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| 233 | WRITE(numout,*) 'ice_dyn_init: ice parameters for ice dynamics ' |
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| 234 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 235 | WRITE(numout,*) ' Namelist namdyn:' |
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| [10911] | 236 | WRITE(numout,*) ' Full ice dynamics (rhg + adv + ridge/raft + corr) ln_dynALL = ', ln_dynALL |
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| 237 | WRITE(numout,*) ' No ridge/raft & No cor (rhg + adv) ln_dynRHGADV = ', ln_dynRHGADV |
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| 238 | WRITE(numout,*) ' Advection 1D only (Schar & Smolarkiewicz 1996) ln_dynADV1D = ', ln_dynADV1D |
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| 239 | WRITE(numout,*) ' Advection 2D only (rn_uvice + adv) ln_dynADV2D = ', ln_dynADV2D |
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| 240 | WRITE(numout,*) ' with prescribed velocity given by (u,v)_ice = (rn_uice,rn_vice) = (', rn_uice,',',rn_vice,')' |
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| 241 | WRITE(numout,*) ' lateral boundary condition for sea ice dynamics rn_ishlat = ', rn_ishlat |
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| 242 | WRITE(numout,*) ' Landfast: param from Lemieux 2016 ln_landfast_L16 = ', ln_landfast_L16 |
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| [13472] | 243 | WRITE(numout,*) ' fraction of ocean depth that ice must reach rn_lf_depfra = ', rn_lf_depfra |
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| 244 | WRITE(numout,*) ' maximum bottom stress per unit area of contact rn_lf_bfr = ', rn_lf_bfr |
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| 245 | WRITE(numout,*) ' relax time scale (s-1) to reach static friction rn_lf_relax = ', rn_lf_relax |
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| 246 | WRITE(numout,*) ' isotropic tensile strength rn_lf_tensile = ', rn_lf_tensile |
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| [9169] | 247 | WRITE(numout,*) |
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| [8586] | 248 | ENDIF |
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| 249 | ! !== set the choice of ice dynamics ==! |
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| 250 | ioptio = 0 |
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| 251 | ! !--- full dynamics (rheology + advection + ridging/rafting + correction) |
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| [10413] | 252 | IF( ln_dynALL ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynALL ; ENDIF |
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| [8586] | 253 | ! !--- dynamics without ridging/rafting and corr (rheology + advection) |
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| [9076] | 254 | IF( ln_dynRHGADV ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynRHGADV ; ENDIF |
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| [10413] | 255 | ! !--- advection 1D only - test case from Schar & Smolarkiewicz 1996 |
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| 256 | IF( ln_dynADV1D ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynADV1D ; ENDIF |
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| 257 | ! !--- advection 2D only with prescribed ice velocities (from namelist) |
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| 258 | IF( ln_dynADV2D ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynADV2D ; ENDIF |
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| [8586] | 259 | ! |
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| 260 | IF( ioptio /= 1 ) CALL ctl_stop( 'ice_dyn_init: one and only one ice dynamics option has to be defined ' ) |
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| 261 | ! |
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| 262 | ! !--- Lateral boundary conditions |
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| 263 | IF ( rn_ishlat == 0. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral free-slip' |
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| 264 | ELSEIF ( rn_ishlat == 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral no-slip' |
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| 265 | ELSEIF ( 0. < rn_ishlat .AND. rn_ishlat < 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral partial-slip' |
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| 266 | ELSEIF ( 2. < rn_ishlat ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral strong-slip' |
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| 267 | ENDIF |
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| [10413] | 268 | ! !--- Landfast ice |
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| [11536] | 269 | IF( .NOT.ln_landfast_L16 ) tau_icebfr(:,:) = 0._wp |
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| [8586] | 270 | ! |
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| 271 | CALL ice_dyn_rdgrft_init ! set ice ridging/rafting parameters |
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| 272 | CALL ice_dyn_rhg_init ! set ice rheology parameters |
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| 273 | CALL ice_dyn_adv_init ! set ice advection parameters |
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| 274 | ! |
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| 275 | END SUBROUTINE ice_dyn_init |
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| 276 | |
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| 277 | #else |
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| 278 | !!---------------------------------------------------------------------- |
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| [9570] | 279 | !! Default option Empty module NO SI3 sea-ice model |
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| [8586] | 280 | !!---------------------------------------------------------------------- |
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| 281 | #endif |
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| 282 | |
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| 283 | !!====================================================================== |
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| 284 | END MODULE icedyn |
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