1 | MODULE limsbc |
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2 | !!====================================================================== |
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3 | !! *** MODULE limsbc *** |
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4 | !! computation of the flux at the sea ice/ocean interface |
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5 | !!====================================================================== |
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6 | !! History : - ! 2006-07 (M. Vancoppelle) LIM3 original code |
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7 | !! 3.0 ! 2008-03 (C. Tallandier) surface module |
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8 | !! - ! 2008-04 (C. Tallandier) split in 2 + new ice-ocean coupling |
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9 | !! 3.3 ! 2010-05 (G. Madec) decrease ocean & ice reference salinities in the Baltic sea |
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10 | !! ! + simplification of the ice-ocean stress calculation |
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11 | !! 3.4 ! 2011-02 (G. Madec) dynamical allocation |
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12 | !! - ! 2012 (D. Iovino) salt flux change |
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13 | !! - ! 2012-05 (C. Rousset) add penetration solar flux |
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14 | !! 3.5 ! 2012-10 (A. Coward, G. Madec) salt fluxes ; ice+snow mass |
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15 | !!---------------------------------------------------------------------- |
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16 | #if defined key_lim3 |
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17 | !!---------------------------------------------------------------------- |
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18 | !! 'key_lim3' LIM 3.0 sea-ice model |
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19 | !!---------------------------------------------------------------------- |
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20 | !! lim_sbc_alloc : allocate the limsbc arrays |
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21 | !! lim_sbc_init : initialisation |
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22 | !! lim_sbc_flx : updates mass, heat and salt fluxes at the ocean surface |
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23 | !! lim_sbc_tau : update i- and j-stresses, and its modulus at the ocean surface |
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24 | !!---------------------------------------------------------------------- |
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25 | USE par_oce ! ocean parameters |
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26 | USE par_ice ! ice parameters |
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27 | USE dom_oce ! ocean domain |
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28 | USE sbc_ice ! Surface boundary condition: sea-ice fields |
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29 | USE sbc_oce ! Surface boundary condition: ocean fields |
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30 | USE phycst ! physical constants |
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31 | USE albedo ! albedo parameters |
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32 | USE ice ! LIM sea-ice variables |
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33 | USE lbclnk ! ocean lateral boundary condition |
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34 | USE in_out_manager ! I/O manager |
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35 | USE lib_mpp ! MPP library |
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36 | USE wrk_nemo ! work arrays |
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37 | USE prtctl ! Print control |
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38 | USE cpl_oasis3, ONLY : lk_cpl |
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39 | USE traqsr ! clem: add penetration of solar flux into the calculation of heat budget |
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40 | USE oce, ONLY : sshn, sshb, snwice_mass, snwice_mass_b, snwice_fmass, sshu_b, sshv_b, sshu_n, sshv_n, sshf_n |
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41 | USE dom_ice, ONLY : tms |
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42 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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43 | |
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44 | IMPLICIT NONE |
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45 | PRIVATE |
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46 | |
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47 | PUBLIC lim_sbc_init ! called by ice_init |
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48 | PUBLIC lim_sbc_flx ! called by sbc_ice_lim |
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49 | PUBLIC lim_sbc_tau ! called by sbc_ice_lim |
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50 | |
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51 | REAL(wp) :: r1_rdtice ! = 1. / rdt_ice |
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52 | REAL(wp) :: epsi16 = 1.e-16_wp ! constant values |
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53 | REAL(wp) :: epsi20 = 1.e-20_wp ! constant values |
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54 | REAL(wp) :: rzero = 0._wp |
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55 | REAL(wp) :: rone = 1._wp |
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56 | REAL(wp) :: r1_rau0 ! = 1 / rau0 |
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57 | |
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58 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: utau_oce, vtau_oce ! air-ocean surface i- & j-stress [N/m2] |
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59 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: tmod_io ! modulus of the ice-ocean velocity [m/s] |
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60 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: soce_0 , sice_0 ! cst SSS and ice salinity (levitating sea-ice) |
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61 | |
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62 | !! * Substitutions |
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63 | # include "vectopt_loop_substitute.h90" |
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64 | !!---------------------------------------------------------------------- |
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65 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
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66 | !! $Id$ |
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67 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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68 | !!---------------------------------------------------------------------- |
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69 | CONTAINS |
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70 | |
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71 | INTEGER FUNCTION lim_sbc_alloc() |
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72 | !!------------------------------------------------------------------- |
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73 | !! *** ROUTINE lim_sbc_alloc *** |
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74 | !!------------------------------------------------------------------- |
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75 | ALLOCATE( soce_0(jpi,jpj) , utau_oce(jpi,jpj) , & |
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76 | & sice_0(jpi,jpj) , vtau_oce(jpi,jpj) , tmod_io(jpi,jpj), STAT=lim_sbc_alloc) |
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77 | ! |
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78 | IF( lk_mpp ) CALL mpp_sum( lim_sbc_alloc ) |
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79 | IF( lim_sbc_alloc /= 0 ) CALL ctl_warn('lim_sbc_alloc: failed to allocate arrays') |
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80 | END FUNCTION lim_sbc_alloc |
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81 | |
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82 | |
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83 | SUBROUTINE lim_sbc_flx( kt ) |
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84 | !!------------------------------------------------------------------- |
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85 | !! *** ROUTINE lim_sbc_flx *** |
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86 | !! |
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87 | !! ** Purpose : Update the surface ocean boundary condition for heat |
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88 | !! salt and mass over areas where sea-ice is non-zero |
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89 | !! |
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90 | !! ** Action : - computes the heat and freshwater/salt fluxes |
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91 | !! at the ice-ocean interface. |
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92 | !! - Update the ocean sbc |
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93 | !! |
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94 | !! ** Outputs : - qsr : sea heat flux: solar |
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95 | !! - qns : sea heat flux: non solar |
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96 | !! - emp : freshwater budget: volume flux |
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97 | !! - emps : freshwater budget: concentration/dillution |
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98 | !! - fr_i : ice fraction |
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99 | !! - tn_ice : sea-ice surface temperature |
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100 | !! - alb_ice : sea-ice alberdo (lk_cpl=T) |
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101 | !! |
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102 | !! References : Goosse, H. et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90. |
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103 | !! Tartinville et al. 2001 Ocean Modelling, 3, 95-108. |
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104 | !!--------------------------------------------------------------------- |
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105 | INTEGER, INTENT(in) :: kt ! number of iteration |
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106 | ! |
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107 | INTEGER :: ji, jj ! dummy loop indices |
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108 | INTEGER :: ierr ! local integer |
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109 | INTEGER :: ifvt, i1mfr, idfr ! some switches |
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110 | INTEGER :: iflt, ial, iadv, ifral, ifrdv |
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111 | REAL(wp) :: zinda, zindb, zfons, zpme ! local scalars |
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112 | REAL(wp) :: zfmm ! IOVINO freezing minus melting (F-M) |
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113 | REAL(wp), POINTER, DIMENSION(:,:) :: zfcm1 , zfcm2 ! solar/non solar heat fluxes |
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114 | REAL(wp), POINTER, DIMENSION(:,:,:) :: zalb, zalbp ! 2D/3D workspace |
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115 | !!--------------------------------------------------------------------- |
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116 | |
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117 | CALL wrk_alloc( jpi, jpj, zfcm1 , zfcm2 ) |
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118 | IF( lk_cpl ) CALL wrk_alloc( jpi, jpj, jpl, zalb, zalbp ) |
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119 | |
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120 | !------------------------------------------! |
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121 | ! heat flux at the ocean surface ! |
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122 | !------------------------------------------! |
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123 | ! pfrld is the lead fraction at the previous time step (actually between TRP and THD) |
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124 | ! changed to old_frld and old ht_i |
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125 | |
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126 | DO jj = 1, jpj |
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127 | DO ji = 1, jpi |
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128 | zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) ) |
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129 | zindb = 1.0 - MAX( rzero , SIGN( rone , - iatte(ji,jj) ) ) |
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130 | ifvt = zinda * MAX( rzero , SIGN( rone, - phicif(ji,jj) ) ) !subscripts are bad here |
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131 | i1mfr = 1.0 - MAX( rzero , SIGN( rone , - at_i(ji,jj) ) ) |
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132 | idfr = 1.0 - MAX( rzero , SIGN( rone , ( 1.0 - at_i(ji,jj) ) - pfrld(ji,jj) ) ) |
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133 | iflt = zinda * (1 - i1mfr) * (1 - ifvt ) |
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134 | ial = ifvt * i1mfr + ( 1 - ifvt ) * idfr |
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135 | iadv = ( 1 - i1mfr ) * zinda |
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136 | ifral = ( 1 - i1mfr * ( 1 - ial ) ) |
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137 | ifrdv = ( 1 - ifral * ( 1 - ial ) ) * iadv |
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138 | |
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139 | ! switch --- 1.0 ---------------- 0.0 -------------------- |
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140 | ! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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141 | ! zinda | if pfrld = 1 | if pfrld < 1 | |
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142 | ! -> ifvt| if pfrld old_ht_i |
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143 | ! i1mfr | if frld = 1 | if frld < 1 | |
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144 | ! idfr | if frld <= pfrld | if frld > pfrld | |
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145 | ! iflt | |
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146 | ! ial | |
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147 | ! iadv | |
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148 | ! ifral |
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149 | ! ifrdv |
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150 | |
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151 | ! computation the solar flux at ocean surface |
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152 | zfcm1(ji,jj) = pfrld(ji,jj) * qsr(ji,jj) + & |
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153 | & zindb * ( 1. - pfrld(ji,jj) ) * fstric(ji,jj) / MAX( iatte(ji,jj), epsi20 ) |
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154 | ! fstric Solar flux transmitted trough the ice |
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155 | ! qsr Net short wave heat flux on free ocean |
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156 | ! new line |
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157 | fscmbq(ji,jj) = zindb * ( 1.0 - pfrld(ji,jj) ) * fstric(ji,jj) / MAX( iatte(ji,jj), epsi20 ) |
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158 | |
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159 | ! computation the non solar heat flux at ocean surface |
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160 | zfcm2(ji,jj) = - zfcm1(ji,jj) & |
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161 | & + iflt * ( fscmbq(ji,jj) ) & ! total abl -> fscmbq is given to the ocean |
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162 | ! fscmbq and ffltbif are obsolete |
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163 | ! & + iflt * ffltbif(ji,jj) !!! only if one category is used |
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164 | & + ifral * ( ial * qcmif(ji,jj) + (1 - ial) * qldif(ji,jj) ) * r1_rdtice & |
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165 | & + ifrdv * ( qfvbq(ji,jj) + qdtcn(ji,jj) ) * r1_rdtice & |
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166 | & + fhmec(ji,jj) & ! new contribution due to snow melt in ridging!! |
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167 | & + fheat_rpo(ji,jj) & ! contribution from ridge formation |
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168 | & + fheat_res(ji,jj) |
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169 | ! fscmbq Part of the solar radiation transmitted through the ice and going to the ocean |
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170 | ! computed in limthd_zdf.F90 |
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171 | ! ffltbif Total heat content of the ice (brine pockets+ice) / delta_t |
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172 | ! qcmif Energy needed to bring the ocean surface layer until its freezing (ok) |
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173 | ! qldif heat balance of the lead (or of the open ocean) |
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174 | ! qfvbq i think this is wrong! |
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175 | ! ---> Array used to store energy in case of total lateral ablation |
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176 | ! qfvbq latent heat uptake/release after accretion/ablation |
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177 | ! qdtcn Energy from the turbulent oceanic heat flux heat flux coming in the lead |
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178 | |
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179 | IF ( num_sal == 2 ) zfcm2(ji,jj) = zfcm2(ji,jj) + fhbri(ji,jj) ! new contribution due to brine drainage |
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180 | |
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181 | ! bottom radiative component is sent to the computation of the |
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182 | ! oceanic heat flux |
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183 | fsbbq(ji,jj) = ( 1.0 - ( ifvt + iflt ) ) * fscmbq(ji,jj) |
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184 | |
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185 | ! used to compute the oceanic heat flux at the next time step |
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186 | qsr(ji,jj) = zfcm1(ji,jj) ! solar heat flux |
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187 | qns(ji,jj) = zfcm2(ji,jj) - fdtcn(ji,jj) ! non solar heat flux |
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188 | ! ! fdtcn : turbulent oceanic heat flux |
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189 | |
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190 | !!gm this IF prevents the vertorisation of the whole loop |
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191 | ! IF ( ( ji == jiindx ) .AND. ( jj == jjindx) ) THEN |
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192 | ! WRITE(numout,*) 'lim_sbc : heat fluxes ' |
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193 | ! WRITE(numout,*) ' at_i : ', at_i(jiindx,jjindx) |
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194 | ! WRITE(numout,*) ' ht_i : ', SUM( ht_i(jiindx,jjindx,1:jpl) ) |
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195 | ! WRITE(numout,*) ' ht_s : ', SUM( ht_s(jiindx,jjindx,1:jpl) ) |
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196 | ! WRITE(numout,*) |
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197 | ! WRITE(numout,*) ' qsr : ', qsr(jiindx,jjindx) |
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198 | ! WRITE(numout,*) ' zfcm1 : ', zfcm1(jiindx,jjindx) |
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199 | ! WRITE(numout,*) ' pfrld : ', pfrld(jiindx,jjindx) |
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200 | ! WRITE(numout,*) ' fstric : ', fstric (jiindx,jjindx) |
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201 | ! WRITE(numout,*) |
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202 | ! WRITE(numout,*) ' qns : ', qns(jiindx,jjindx) |
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203 | ! WRITE(numout,*) ' zfcm2 : ', zfcm2(jiindx,jjindx) |
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204 | ! WRITE(numout,*) ' zfcm1 : ', zfcm1(jiindx,jjindx) |
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205 | ! WRITE(numout,*) ' ifral : ', ifral |
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206 | ! WRITE(numout,*) ' ial : ', ial |
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207 | ! WRITE(numout,*) ' qcmif : ', qcmif(jiindx,jjindx) |
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208 | ! WRITE(numout,*) ' qldif : ', qldif(jiindx,jjindx) |
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209 | ! !WRITE(numout,*) ' qcmif / dt: ', qcmif(jiindx,jjindx) * r1_rdtice |
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210 | ! !WRITE(numout,*) ' qldif / dt: ', qldif(jiindx,jjindx) * r1_rdtice |
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211 | ! WRITE(numout,*) ' ifrdv : ', ifrdv |
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212 | ! WRITE(numout,*) ' qfvbq : ', qfvbq(jiindx,jjindx) |
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213 | ! WRITE(numout,*) ' qdtcn : ', qdtcn(jiindx,jjindx) |
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214 | ! !WRITE(numout,*) ' qfvbq / dt: ', qfvbq(jiindx,jjindx) * r1_rdtice |
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215 | ! !WRITE(numout,*) ' qdtcn / dt: ', qdtcn(jiindx,jjindx) * r1_rdtice |
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216 | ! WRITE(numout,*) ' ' |
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217 | ! WRITE(numout,*) ' fdtcn : ', fdtcn(jiindx,jjindx) |
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218 | ! WRITE(numout,*) ' fhmec : ', fhmec(jiindx,jjindx) |
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219 | ! WRITE(numout,*) ' fheat_rpo : ', fheat_rpo(jiindx,jjindx) |
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220 | ! WRITE(numout,*) ' fhbri : ', fhbri(jiindx,jjindx) |
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221 | ! WRITE(numout,*) ' fheat_res : ', fheat_res(jiindx,jjindx) |
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222 | ! ENDIF |
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223 | !!gm end |
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224 | END DO |
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225 | END DO |
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226 | |
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227 | !------------------------------------------! |
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228 | ! mass flux at the ocean surface ! |
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229 | !------------------------------------------! |
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230 | |
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231 | !!gm optimisation: this loop have to be merged with the previous one |
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232 | DO jj = 1, jpj |
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233 | DO ji = 1, jpi |
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234 | ! case of realistic freshwater flux (Tartinville et al., 2001) (presently ACTIVATED) |
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235 | ! ------------------------------------------------------------------------------------- |
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236 | ! The idea of this approach is that the system that we consider is the ICE-OCEAN system |
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237 | ! Thus FW flux = External ( E-P+snow melt) |
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238 | ! Salt flux = Exchanges in the ice-ocean system then converted into FW |
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239 | ! Associated to Ice formation AND Ice melting |
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240 | ! Even if i see Ice melting as a FW and SALT flux |
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241 | ! |
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242 | |
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243 | ! computing freshwater exchanges at the ice/ocean interface |
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244 | zpme = - emp(ji,jj) * ( 1.0 - at_i(ji,jj) ) & ! evaporation over oceanic fraction |
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245 | & + tprecip(ji,jj) * at_i(ji,jj) & ! all precipitation reach the ocean |
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246 | & - sprecip(ji,jj) * ( 1. - (pfrld(ji,jj)**betas) ) & ! except solid precip intercepted by sea-ice |
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247 | & - rdmsnif(ji,jj) * r1_rdtice & ! freshwaterflux due to snow melting |
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248 | & + fmmec(ji,jj) ! snow falling when ridging |
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249 | |
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250 | |
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251 | ! computing salt exchanges at the ice/ocean interface |
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252 | ! sice should be the same as computed with the ice model |
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253 | !zfons = ( soce_0(ji,jj) - sice_0(ji,jj) ) * rdmicif(ji,jj) * r1_rdtice |
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254 | ! SOCE |
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255 | !zfons = ( sss_m (ji,jj) - sice_0(ji,jj) ) * rdmicif(ji,jj) * r1_rdtice |
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256 | zfmm = rdmicif(ji,jj) * r1_rdtice ! IOVINO |
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257 | !CT useless ! salt flux for constant salinity |
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258 | !CT useless fsalt(ji,jj) = zfons / ( sss_m(ji,jj) + epsi16 ) + fsalt_res(ji,jj) |
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259 | ! salt flux for variable salinity |
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260 | zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) ) |
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261 | ! correcting brine and salt fluxes |
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262 | fsbri(ji,jj) = zinda*fsbri(ji,jj) |
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263 | ! converting the salt fluxes from ice to a freshwater flux from ocean |
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264 | ! fsalt_res(ji,jj) = fsalt_res(ji,jj) / ( sss_m(ji,jj) + epsi16 ) |
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265 | ! fseqv(ji,jj) = fseqv(ji,jj) / ( sss_m(ji,jj) + epsi16 ) |
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266 | ! fsbri(ji,jj) = fsbri(ji,jj) / ( sss_m(ji,jj) + epsi16 ) |
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267 | ! fsalt_rpo(ji,jj) = fsalt_rpo(ji,jj) / ( sss_m(ji,jj) + epsi16 ) |
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268 | |
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269 | ! freshwater mass exchange (positive to the ice, negative for the ocean ?) |
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270 | ! actually it's a salt flux (so it's minus freshwater flux) |
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271 | ! if sea ice grows, zfons is positive, fsalt also |
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272 | ! POSITIVE SALT FLUX FROM THE ICE TO THE OCEAN |
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273 | ! POSITIVE FRESHWATER FLUX FROM THE OCEAN TO THE ICE [kg.m-2.s-1] |
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274 | |
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275 | emp(ji,jj) = - zpme + zfmm ! volume flux IOVINO |
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276 | ! emp(ji,jj) = - zpme |
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277 | END DO |
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278 | END DO |
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279 | |
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280 | IF( num_sal == 2 ) THEN ! variable ice salinity: brine drainage included in the salt flux |
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281 | emps(:,:) = fsbri(:,:) + fseqv(:,:) + fsalt_res(:,:) + fsalt_rpo(:,:) ! + emp(:,:) ! IOVINO |
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282 | ELSE ! constant ice salinity: |
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283 | emps(:,:) = fseqv(:,:) + fsalt_res(:,:) + fsalt_rpo(:,:) ! + emp(:,:) ! IOVINO |
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284 | ENDIF |
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285 | |
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286 | !-----------------------------------------------! |
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287 | ! mass of snow and ice per unit area ! |
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288 | !-----------------------------------------------! |
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289 | !SF IF( nn_ice_embd /= 0 ) THEN ! embedded sea-ice (mass required) |
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290 | snwice_mass_b(:,:) = snwice_mass(:,:) ! save mass from the previous ice time step |
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291 | ! ! new mass per unit area |
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292 | snwice_mass (:,:) = tms(:,:) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) |
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293 | ! ! time evolution of snow+ice mass |
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294 | snwice_fmass (:,:) = ( snwice_mass(:,:) - snwice_mass_b(:,:) ) * r1_rdtice |
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295 | !SF ENDIF |
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296 | |
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297 | !-----------------------------------------------! |
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298 | ! Storing the transmitted variables ! |
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299 | !-----------------------------------------------! |
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300 | fr_i (:,:) = at_i(:,:) ! Sea-ice fraction |
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301 | tn_ice(:,:,:) = t_su(:,:,:) ! Ice surface temperature |
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302 | |
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303 | !------------------------------------------------! |
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304 | ! Computation of snow/ice and ocean albedo ! |
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305 | !------------------------------------------------! |
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306 | IF( lk_cpl ) THEN ! coupled case |
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307 | CALL albedo_ice( t_su, ht_i, ht_s, zalbp, zalb ) ! snow/ice albedo |
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308 | ! |
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309 | alb_ice(:,:,:) = 0.5_wp * zalbp(:,:,:) + 0.5_wp * zalb (:,:,:) ! Ice albedo (mean clear and overcast skys) |
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310 | ENDIF |
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311 | |
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312 | IF(ln_ctl) THEN |
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313 | CALL prt_ctl( tab2d_1=qsr , clinfo1=' lim_sbc: qsr : ', tab2d_2=qns , clinfo2=' qns : ' ) |
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314 | CALL prt_ctl( tab2d_1=emp , clinfo1=' lim_sbc: emp : ', tab2d_2=emps, clinfo2=' emps : ' ) |
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315 | CALL prt_ctl( tab2d_1=fr_i , clinfo1=' lim_sbc: fr_i : ' ) |
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316 | CALL prt_ctl( tab3d_1=tn_ice, clinfo1=' lim_sbc: tn_ice : ', kdim=jpl ) |
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317 | ENDIF |
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318 | ! |
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319 | CALL wrk_dealloc( jpi, jpj, zfcm1 , zfcm2 ) |
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320 | IF( lk_cpl ) CALL wrk_dealloc( jpi, jpj, jpl, zalb, zalbp ) |
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321 | ! |
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322 | END SUBROUTINE lim_sbc_flx |
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323 | |
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324 | |
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325 | SUBROUTINE lim_sbc_tau( kt , pu_oce, pv_oce ) |
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326 | !!------------------------------------------------------------------- |
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327 | !! *** ROUTINE lim_sbc_tau *** |
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328 | !! |
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329 | !! ** Purpose : Update the ocean surface stresses due to the ice |
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330 | !! |
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331 | !! ** Action : * at each ice time step (every nn_fsbc time step): |
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332 | !! - compute the modulus of ice-ocean relative velocity |
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333 | !! (*rho*Cd) at T-point (C-grid) or I-point (B-grid) |
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334 | !! tmod_io = rhoco * | U_ice-U_oce | |
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335 | !! - update the modulus of stress at ocean surface |
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336 | !! taum = frld * taum + (1-frld) * tmod_io * | U_ice-U_oce | |
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337 | !! * at each ocean time step (every kt): |
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338 | !! compute linearized ice-ocean stresses as |
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339 | !! Utau = tmod_io * | U_ice - pU_oce | |
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340 | !! using instantaneous current ocean velocity (usually before) |
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341 | !! |
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342 | !! NB: - ice-ocean rotation angle no more allowed |
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343 | !! - here we make an approximation: taum is only computed every ice time step |
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344 | !! This avoids mutiple average to pass from T -> U,V grids and next from U,V grids |
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345 | !! to T grid. taum is used in TKE and GLS, which should not be too sensitive to this approximaton... |
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346 | !! |
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347 | !! ** Outputs : - utau, vtau : surface ocean i- and j-stress (u- & v-pts) updated with ice-ocean fluxes |
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348 | !! - taum : modulus of the surface ocean stress (T-point) updated with ice-ocean fluxes |
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349 | !!--------------------------------------------------------------------- |
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350 | INTEGER , INTENT(in) :: kt ! ocean time-step index |
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351 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pu_oce, pv_oce ! surface ocean currents |
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352 | !! |
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353 | INTEGER :: ji, jj ! dummy loop indices |
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354 | REAL(wp) :: zat_u, zutau_ice, zu_t, zmodt ! local scalar |
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355 | REAL(wp) :: zat_v, zvtau_ice, zv_t ! - - |
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356 | !!--------------------------------------------------------------------- |
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357 | ! |
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358 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN !== Ice time-step only ==! (i.e. surface module time-step) |
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359 | !CDIR NOVERRCHK |
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360 | DO jj = 2, jpjm1 !* update the modulus of stress at ocean surface (T-point) |
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361 | !CDIR NOVERRCHK |
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362 | DO ji = fs_2, fs_jpim1 |
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363 | ! ! 2*(U_ice-U_oce) at T-point |
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364 | zu_t = u_ice(ji,jj) + u_ice(ji-1,jj) - u_oce(ji,jj) - u_oce(ji-1,jj) |
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365 | zv_t = v_ice(ji,jj) + v_ice(ji,jj-1) - v_oce(ji,jj) - v_oce(ji,jj-1) |
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366 | ! ! |U_ice-U_oce|^2 |
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367 | zmodt = 0.25_wp * ( zu_t * zu_t + zv_t * zv_t ) |
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368 | ! ! update the ocean stress modulus |
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369 | taum(ji,jj) = ( 1._wp - at_i(ji,jj) ) * taum(ji,jj) + at_i(ji,jj) * rhoco * zmodt |
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370 | tmod_io(ji,jj) = rhoco * SQRT( zmodt ) ! rhoco * |U_ice-U_oce| at T-point |
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371 | END DO |
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372 | END DO |
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373 | CALL lbc_lnk( taum, 'T', 1. ) ; CALL lbc_lnk( tmod_io, 'T', 1. ) |
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374 | ! |
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375 | utau_oce(:,:) = utau(:,:) !* save the air-ocean stresses at ice time-step |
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376 | vtau_oce(:,:) = vtau(:,:) |
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377 | ! |
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378 | ENDIF |
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379 | ! |
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380 | ! !== every ocean time-step ==! |
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381 | ! |
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382 | DO jj = 2, jpjm1 !* update the stress WITHOUT a ice-ocean rotation angle |
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383 | DO ji = fs_2, fs_jpim1 ! Vect. Opt. |
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384 | zat_u = ( at_i(ji,jj) + at_i(ji+1,jj) ) * 0.5_wp ! ice area at u and V-points |
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385 | zat_v = ( at_i(ji,jj) + at_i(ji,jj+1) ) * 0.5_wp |
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386 | ! ! linearized quadratic drag formulation |
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387 | zutau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * ( u_ice(ji,jj) - pu_oce(ji,jj) ) |
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388 | zvtau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * ( v_ice(ji,jj) - pv_oce(ji,jj) ) |
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389 | ! ! stresses at the ocean surface |
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390 | utau(ji,jj) = ( 1._wp - zat_u ) * utau_oce(ji,jj) + zat_u * zutau_ice |
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391 | vtau(ji,jj) = ( 1._wp - zat_v ) * vtau_oce(ji,jj) + zat_v * zvtau_ice |
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392 | END DO |
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393 | END DO |
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394 | CALL lbc_lnk( utau, 'U', -1. ) ; CALL lbc_lnk( vtau, 'V', -1. ) ! lateral boundary condition |
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395 | ! |
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396 | IF(ln_ctl) CALL prt_ctl( tab2d_1=utau, clinfo1=' lim_sbc: utau : ', mask1=umask, & |
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397 | & tab2d_2=vtau, clinfo2=' vtau : ' , mask2=vmask ) |
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398 | ! |
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399 | END SUBROUTINE lim_sbc_tau |
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400 | |
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401 | |
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402 | SUBROUTINE lim_sbc_init |
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403 | !!------------------------------------------------------------------- |
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404 | !! *** ROUTINE lim_sbc_init *** |
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405 | !! |
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406 | !! ** Purpose : Preparation of the file ice_evolu for the output of |
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407 | !! the temporal evolution of key variables |
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408 | !! |
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409 | !! ** input : Namelist namicedia |
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410 | !!------------------------------------------------------------------- |
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411 | REAL(wp) :: zsum, zarea |
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412 | r1_rau0 = 1._wp / rau0 |
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413 | ! |
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414 | IF(lwp) WRITE(numout,*) |
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415 | IF(lwp) WRITE(numout,*) 'lim_sbc_init : LIM-3 sea-ice - surface boundary condition' |
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416 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~ ' |
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417 | |
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418 | ! ! allocate lim_sbc array |
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419 | IF( lim_sbc_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'lim_sbc_init : unable to allocate standard arrays' ) |
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420 | ! |
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421 | r1_rdtice = 1. / rdt_ice |
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422 | ! |
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423 | soce_0(:,:) = soce ! constant SSS and ice salinity used in levitating sea-ice case |
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424 | sice_0(:,:) = sice |
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425 | ! |
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426 | IF( cp_cfg == "orca" ) THEN ! decrease ocean & ice reference salinities in the Baltic sea |
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427 | WHERE( 14._wp <= glamt(:,:) .AND. glamt(:,:) <= 32._wp .AND. & |
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428 | & 54._wp <= gphit(:,:) .AND. gphit(:,:) <= 66._wp ) |
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429 | soce_0(:,:) = 4._wp |
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430 | sice_0(:,:) = 2._wp |
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431 | END WHERE |
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432 | ENDIF |
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433 | ! clem modif |
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434 | iatte(:,:) = 1._wp |
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435 | oatte(:,:) = 1._wp |
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436 | ! |
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437 | ! ! sea ice with mass exchange |
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438 | snwice_mass (:,:) = tms(:,:) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) |
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439 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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440 | IF( .NOT. ln_rstart ) THEN ! delete the initial ssh below sea-ice area |
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441 | ! |
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442 | zarea = glob_sum( e1e2t(:,:) ) ! interior global domain surface |
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443 | zsum = glob_sum( e1e2t(:,:) * ( snwice_mass(:,:) ) ) / zarea * r1_rau0 |
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444 | sshn(:,:) = sshn(:,:) - zsum |
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445 | sshb(:,:) = sshb(:,:) - zsum |
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446 | ENDIF |
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447 | ! |
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448 | ! |
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449 | END SUBROUTINE lim_sbc_init |
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450 | |
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451 | #else |
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452 | !!---------------------------------------------------------------------- |
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453 | !! Default option : Dummy module NO LIM 3.0 sea-ice model |
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454 | !!---------------------------------------------------------------------- |
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455 | CONTAINS |
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456 | SUBROUTINE lim_sbc ! Dummy routine |
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457 | END SUBROUTINE lim_sbc |
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458 | #endif |
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459 | |
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460 | !!====================================================================== |
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461 | END MODULE limsbc |
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