1 | MODULE limmsh |
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2 | !!====================================================================== |
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3 | !! *** MODULE limmsh *** |
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4 | !! LIM ice model : definition of the ice mesh parameters |
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5 | !!====================================================================== |
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6 | !! History : 3.2 ! 2008-01 (NEMO team) LIM-3: adaptation from LIM-2 |
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7 | !!---------------------------------------------------------------------- |
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8 | #if defined key_lim3 |
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9 | !!---------------------------------------------------------------------- |
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10 | !! 'key_lim3' LIM3 sea-ice model |
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11 | !!---------------------------------------------------------------------- |
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12 | !! lim_msh : definition of the ice mesh |
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13 | !!---------------------------------------------------------------------- |
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14 | USE phycst ! physical constants |
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15 | USE dom_oce ! ocean domain |
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16 | USE dom_ice ! sea-ice domain |
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17 | USE in_out_manager ! I/O manager |
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18 | USE lbclnk ! |
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19 | |
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20 | IMPLICIT NONE |
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21 | PRIVATE |
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22 | |
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23 | PUBLIC lim_msh ! routine called by ice_ini.F90 |
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24 | |
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25 | !!---------------------------------------------------------------------- |
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26 | !! NEMO/LIM 3.2, UCL-ASTR-LOCEAN-IPSL (2009) |
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27 | !! $Id$ |
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28 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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29 | !!---------------------------------------------------------------------- |
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30 | |
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31 | CONTAINS |
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32 | |
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33 | SUBROUTINE lim_msh |
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34 | !!------------------------------------------------------------------- |
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35 | !! *** ROUTINE lim_msh *** |
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36 | !! |
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37 | !! ** Purpose : Definition of the charact. of the numerical grid |
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38 | !! |
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39 | !! ** Action : - Initialisation of some variables |
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40 | !! - Definition of some constants linked with the grid |
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41 | !! - Definition of the metric coef. for the sea/ice |
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42 | !! - Initialization of the ice masks (tmsk, umsk) |
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43 | !! |
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44 | !! Reference : Deleersnijder et al. Ocean Modelling 100, 7-10 |
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45 | !!--------------------------------------------------------------------- |
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46 | INTEGER :: ji, jj ! dummy loop indices |
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47 | REAL(wp) :: zusden ! temporary scalar |
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48 | !!--------------------------------------------------------------------- |
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49 | |
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50 | IF(lwp) THEN |
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51 | WRITE(numout,*) |
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52 | WRITE(numout,*) 'lim_msh : LIM-3 sea-ice model, mesh initialization' |
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53 | WRITE(numout,*) '~~~~~~~' |
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54 | ENDIF |
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55 | |
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56 | IF( jphgr_msh == 2 .OR. jphgr_msh == 3 .OR. jphgr_msh == 5 ) & |
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57 | & CALL ctl_stop(' Coriolis parameter in LIM not set for f- or beta-plane' ) |
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58 | |
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59 | ! !== coriolis factor & Equator position ==! |
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60 | njeq = INT( jpj / 2 ) |
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61 | njeqm1 = njeq - 1 |
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62 | ! |
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63 | fcor(:,:) = 2. * omega * SIN( gphit(:,:) * rad ) ! coriolis factor |
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64 | ! |
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65 | IF( fcor(1,1) * fcor(1,nlcj) < 0.e0 ) THEN ! local domain include both hemisphere |
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66 | l_jeq = .TRUE. |
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67 | njeq = 1 |
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68 | DO WHILE ( njeq <= jpj .AND. fcor(1,njeq) < 0.e0 ) |
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69 | njeq = njeq + 1 |
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70 | END DO |
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71 | IF(lwp ) WRITE(numout,*) ' the equator is inside the domain at about njeq = ', njeq |
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72 | ELSEIF( fcor(1,1) < 0.e0 ) THEN |
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73 | l_jeq = .FALSE. |
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74 | njeq = jpj |
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75 | IF(lwp ) WRITE(numout,*) ' the model domain is entirely in the southern hemisphere: njeq = ', njeq |
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76 | ELSE |
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77 | l_jeq = .FALSE. |
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78 | njeq = 2 |
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79 | IF(lwp ) WRITE(numout,*) ' the model domain is entirely in the northern hemisphere: njeq = ', njeq |
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80 | ENDIF |
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81 | ! |
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82 | njeqm1 = njeq - 1 |
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83 | |
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84 | |
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85 | ! !== metric coefficients for sea ice dynamic ==! |
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86 | wght(:,:,:,:) = 0.e0 |
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87 | !!gm Optimisation : wght to be defined at F-point, not I-point and change in limrhg |
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88 | DO jj = 2, jpj |
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89 | DO ji = 2, jpi |
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90 | zusden = 1.e0 / ( ( e1t(ji,jj) + e1t(ji-1,jj ) ) & |
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91 | & * ( e2t(ji,jj) + e2t(ji ,jj-1) ) ) |
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92 | wght(ji,jj,1,1) = zusden * e1t(ji ,jj) * e2t(ji,jj ) |
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93 | wght(ji,jj,1,2) = zusden * e1t(ji ,jj) * e2t(ji,jj-1) |
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94 | wght(ji,jj,2,1) = zusden * e1t(ji-1,jj) * e2t(ji,jj ) |
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95 | wght(ji,jj,2,2) = zusden * e1t(ji-1,jj) * e2t(ji,jj-1) |
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96 | END DO |
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97 | END DO |
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98 | CALL lbc_lnk( wght(:,:,1,1), 'I', 1. ) ! CAUTION: even with the lbc_lnk at ice U-V-point |
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99 | CALL lbc_lnk( wght(:,:,1,2), 'I', 1. ) ! the value of wght at jpj is wrong |
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100 | CALL lbc_lnk( wght(:,:,2,1), 'I', 1. ) ! but it is never used |
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101 | CALL lbc_lnk( wght(:,:,2,2), 'I', 1. ) |
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102 | !!gm end |
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103 | |
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104 | ! !== ice masks ==! |
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105 | tms(:,:) = tmask(:,:,1) ! ice T-point : use surface tmask |
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106 | tmu(:,:) = umask(:,:,1) ! ice U-point : use surface umask (C-grid EVP) |
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107 | tmv(:,:) = vmask(:,:,1) ! ice V-point : use surface vmask (C-grid EVP) |
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108 | DO jj = 1, jpjm1 ! ice F-point : recompute fmask (due to nn_shlat) |
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109 | DO ji = 1 , jpim1 ! NO vector opt. |
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110 | tmf(ji,jj) = tms(ji,jj) * tms(ji+1,jj) * tms(ji,jj+1) * tms(ji+1,jj+1) |
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111 | END DO |
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112 | END DO |
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113 | CALL lbc_lnk( tmf(:,:), 'F', 1. ) ! lateral boundary conditions |
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114 | |
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115 | ! !== unmasked and masked area of T-grid cell |
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116 | area(:,:) = e1t(:,:) * e2t(:,:) |
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117 | ! |
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118 | END SUBROUTINE lim_msh |
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119 | |
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120 | #else |
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121 | !!---------------------------------------------------------------------- |
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122 | !! Default option Dummy Module NO LIM sea-ice model |
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123 | !!---------------------------------------------------------------------- |
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124 | CONTAINS |
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125 | SUBROUTINE lim_msh ! Dummy routine |
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126 | END SUBROUTINE lim_msh |
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127 | #endif |
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128 | |
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129 | !!====================================================================== |
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130 | END MODULE limmsh |
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