1 | MODULE sbcisf |
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2 | !!====================================================================== |
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3 | !! *** MODULE sbcisf *** |
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4 | !! Surface module : update surface ocean boundary condition under ice |
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5 | !! shelf |
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6 | !!====================================================================== |
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7 | !! History : 3.2 ! 2011-02 (C.Harris ) Original code isf cav |
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8 | !! X.X ! 2006-02 (C. Wang ) Original code bg03 |
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9 | !! 3.4 ! 2013-03 (P. Mathiot) Merging + parametrization |
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10 | !!---------------------------------------------------------------------- |
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11 | |
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12 | !!---------------------------------------------------------------------- |
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13 | !! sbc_isf : update sbc under ice shelf |
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14 | !!---------------------------------------------------------------------- |
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15 | USE oce ! ocean dynamics and tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE phycst ! physical constants |
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18 | USE eosbn2 ! equation of state |
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19 | USE sbc_oce ! surface boundary condition: ocean fields |
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20 | USE lbclnk ! |
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21 | USE iom ! I/O manager library |
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22 | USE in_out_manager ! I/O manager |
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23 | USE wrk_nemo ! Memory allocation |
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24 | USE timing ! Timing |
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25 | USE lib_fortran ! glob_sum |
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26 | USE zdfbfr |
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27 | USE fldread ! read input field at current time step |
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28 | USE lib_fortran, ONLY: glob_sum |
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29 | |
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30 | IMPLICIT NONE |
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31 | PRIVATE |
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32 | |
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33 | PUBLIC sbc_isf, sbc_isf_div, sbc_isf_alloc ! routine called in sbcmod and divcur |
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34 | |
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35 | ! public in order to be able to output then |
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36 | |
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37 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: risf_tsc_b, risf_tsc |
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38 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: qisf !: net heat flux from ice shelf |
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39 | REAL(wp), PUBLIC :: rn_hisf_tbl !: thickness of top boundary layer [m] |
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40 | LOGICAL , PUBLIC :: ln_divisf !: flag to correct divergence |
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41 | INTEGER , PUBLIC :: nn_isfblk !: |
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42 | INTEGER , PUBLIC :: nn_gammablk !: |
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43 | LOGICAL , PUBLIC :: ln_conserve !: |
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44 | REAL(wp), PUBLIC :: rn_gammat0 !: temperature exchange coeficient |
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45 | REAL(wp), PUBLIC :: rn_gammas0 !: salinity exchange coeficient |
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46 | REAL(wp), PUBLIC :: rdivisf !: flag to test if fwf apply on divergence |
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47 | |
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48 | REAL(wp) , PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: rzisf_tbl !:depth of calving front (shallowest point) nn_isf ==2/3 |
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49 | REAL(wp) , PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: rhisf_tbl, rhisf_tbl_0 !:thickness of tbl |
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50 | REAL(wp) , PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: r1_hisf_tbl !:1/thickness of tbl |
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51 | REAL(wp) , PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: ralpha !:proportion of bottom cell influenced by tbl |
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52 | REAL(wp) , PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: risfLeff !:effective length (Leff) BG03 nn_isf==2 |
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53 | REAL(wp) , PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: ttbl, stbl, utbl, vtbl !:top boundary layer variable at T point |
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54 | INTEGER, PUBLIC, ALLOCATABLE, SAVE, DIMENSION (:,:) :: misfkt, misfkb !:Level of ice shelf base |
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55 | |
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56 | |
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57 | REAL(wp), PUBLIC, SAVE :: rcpi = 2000.0_wp ! phycst ? |
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58 | REAL(wp), PUBLIC, SAVE :: kappa = 1.54e-6_wp ! phycst ? |
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59 | REAL(wp), PUBLIC, SAVE :: rhoisf = 920.0_wp ! phycst ? |
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60 | REAL(wp), PUBLIC, SAVE :: tsurf = -20.0_wp ! phycst ? |
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61 | REAL(wp), PUBLIC, SAVE :: lfusisf= 0.334e6_wp ! phycst ? |
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62 | |
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63 | !: Variable used in fldread to read the forcing file (nn_isf == 4 .OR. nn_isf == 3) |
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64 | CHARACTER(len=100), PUBLIC :: cn_dirisf = './' !: Root directory for location of ssr files |
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65 | TYPE(FLD_N) , PUBLIC :: sn_qisf, sn_fwfisf !: information about the runoff file to be read |
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66 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_qisf, sf_fwfisf |
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67 | TYPE(FLD_N) , PUBLIC :: sn_rnfisf !: information about the runoff file to be read |
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68 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_rnfisf |
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69 | TYPE(FLD_N) , PUBLIC :: sn_depmax_isf, sn_depmin_isf, sn_Leff_isf !: information about the runoff file to be read |
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70 | |
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71 | !! * Substitutions |
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72 | # include "domzgr_substitute.h90" |
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73 | !!---------------------------------------------------------------------- |
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74 | !! NEMO/OPA 3.0 , LOCEAN-IPSL (2008) |
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75 | !! $Id$ |
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76 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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77 | !!---------------------------------------------------------------------- |
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78 | |
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79 | CONTAINS |
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80 | |
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81 | SUBROUTINE sbc_isf(kt) |
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82 | INTEGER, INTENT(in) :: kt ! ocean time step |
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83 | INTEGER :: ji, jj, jk, ijkmin, inum, ierror |
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84 | INTEGER :: ikt, ikb ! top and bottom level of the isf boundary layer |
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85 | REAL(wp) :: zgreenland_fwfisf_sum, zantarctica_fwfisf_sum |
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86 | REAL(wp) :: rmin |
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87 | REAL(wp) :: zhk |
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88 | REAL(wp) :: zt_frz, zpress |
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89 | CHARACTER(len=256) :: cfisf , cvarzisf, cvarhisf ! name for isf file |
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90 | CHARACTER(LEN=256) :: cnameis ! name of iceshelf file |
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91 | CHARACTER (LEN=32) :: cvarLeff ! variable name for efficient Length scale |
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92 | INTEGER :: ios ! Local integer output status for namelist read |
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93 | LOGICAL :: ll_wrtstp !write diagnostics? |
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94 | |
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95 | REAL(wp), DIMENSION(:,:,:), POINTER :: zfwfisf3d, zqhcisf3d, zqlatisf3d |
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96 | REAL(wp), DIMENSION(:,: ), POINTER :: zqhcisf2d |
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97 | ! |
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98 | !!--------------------------------------------------------------------- |
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99 | NAMELIST/namsbc_isf/ nn_isfblk, rn_hisf_tbl, ln_divisf, ln_conserve, rn_gammat0, rn_gammas0, nn_gammablk, & |
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100 | & sn_fwfisf, sn_qisf, sn_rnfisf, sn_depmax_isf, sn_depmin_isf, sn_Leff_isf |
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101 | ! |
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102 | ! |
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103 | ll_wrtstp = ( MOD( kt, sn_cfctl%ptimincr ) == 0 ) .OR. ( kt == nitend ) |
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104 | ! ! ====================== ! |
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105 | IF( kt == nit000 ) THEN ! First call kt=nit000 ! |
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106 | ! ! ====================== ! |
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107 | REWIND( numnam_ref ) ! Namelist namsbc_rnf in reference namelist : Runoffs |
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108 | READ ( numnam_ref, namsbc_isf, IOSTAT = ios, ERR = 901) |
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109 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_isf in reference namelist', lwp ) |
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110 | |
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111 | REWIND( numnam_cfg ) ! Namelist namsbc_rnf in configuration namelist : Runoffs |
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112 | READ ( numnam_cfg, namsbc_isf, IOSTAT = ios, ERR = 902 ) |
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113 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_isf in configuration namelist', lwp ) |
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114 | IF(lwm .AND. nprint > 2) WRITE ( numond, namsbc_isf ) |
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115 | |
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116 | |
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117 | IF ( lwp ) WRITE(numout,*) |
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118 | IF ( lwp ) WRITE(numout,*) 'sbc_isf: heat flux of the ice shelf' |
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119 | IF ( lwp ) WRITE(numout,*) '~~~~~~~~~' |
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120 | IF ( lwp ) WRITE(numout,*) 'sbcisf :' |
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121 | IF ( lwp ) WRITE(numout,*) '~~~~~~~~' |
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122 | IF ( lwp ) WRITE(numout,*) ' nn_isf = ', nn_isf |
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123 | IF ( lwp ) WRITE(numout,*) ' nn_isfblk = ', nn_isfblk |
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124 | IF ( lwp ) WRITE(numout,*) ' rn_hisf_tbl = ', rn_hisf_tbl |
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125 | IF ( lwp ) WRITE(numout,*) ' ln_divisf = ', ln_divisf |
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126 | IF ( lwp ) WRITE(numout,*) ' nn_gammablk = ', nn_gammablk |
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127 | IF ( lwp ) WRITE(numout,*) ' rn_tfri2 = ', rn_tfri2 |
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128 | IF(lwp .AND. lflush) CALL flush(numout) |
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129 | IF (ln_divisf) THEN ! keep it in the namelist ??? used true anyway as for runoff ? (PM) |
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130 | rdivisf = 1._wp |
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131 | ELSE |
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132 | rdivisf = 0._wp |
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133 | END IF |
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134 | ! |
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135 | ! Allocate public variable |
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136 | IF ( sbc_isf_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'sbc_isf : unable to allocate arrays' ) |
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137 | ! |
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138 | ! initialisation |
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139 | qisf(:,:) = 0._wp ; fwfisf(:,:) = 0._wp |
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140 | risf_tsc(:,:,:) = 0._wp |
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141 | ! |
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142 | ! define isf tbl tickness, top and bottom indice |
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143 | IF (nn_isf == 1) THEN |
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144 | rhisf_tbl(:,:) = rn_hisf_tbl |
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145 | misfkt(:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv |
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146 | ELSE IF ((nn_isf == 3) .OR. (nn_isf == 2)) THEN |
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147 | ALLOCATE( sf_rnfisf(1), STAT=ierror ) |
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148 | ALLOCATE( sf_rnfisf(1)%fnow(jpi,jpj,1), sf_rnfisf(1)%fdta(jpi,jpj,1,2) ) |
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149 | CALL fld_fill( sf_rnfisf, (/ sn_rnfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' ) |
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150 | |
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151 | !: read effective lenght (BG03) |
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152 | IF (nn_isf == 2) THEN |
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153 | ! Read Data and save some integral values |
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154 | CALL iom_open( sn_Leff_isf%clname, inum ) |
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155 | cvarLeff = 'soLeff' !: variable name for Efficient Length scale |
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156 | CALL iom_get( inum, jpdom_data, cvarLeff, risfLeff , 1) |
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157 | CALL iom_close(inum) |
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158 | ! |
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159 | risfLeff = risfLeff*1000 !: convertion in m |
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160 | END IF |
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161 | |
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162 | ! read depth of the top and bottom of the isf top boundary layer (in this case, isf front depth and grounding line depth) |
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163 | CALL iom_open( sn_depmax_isf%clname, inum ) |
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164 | cvarhisf = TRIM(sn_depmax_isf%clvar) |
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165 | CALL iom_get( inum, jpdom_data, cvarhisf, rhisf_tbl, 1) !: depth of deepest point of the ice shelf base |
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166 | CALL iom_close(inum) |
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167 | ! |
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168 | CALL iom_open( sn_depmin_isf%clname, inum ) |
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169 | cvarzisf = TRIM(sn_depmin_isf%clvar) |
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170 | CALL iom_get( inum, jpdom_data, cvarzisf, rzisf_tbl, 1) !: depth of shallowest point of the ice shelves base |
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171 | CALL iom_close(inum) |
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172 | ! |
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173 | rhisf_tbl(:,:) = rhisf_tbl(:,:) - rzisf_tbl(:,:) !: tickness isf boundary layer |
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174 | |
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175 | !! compute first level of the top boundary layer |
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176 | DO ji = 1, jpi |
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177 | DO jj = 1, jpj |
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178 | jk = 2 |
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179 | DO WHILE ( jk .LE. mbkt(ji,jj) .AND. gdepw_0(ji,jj,jk) < rzisf_tbl(ji,jj) ) ; jk = jk + 1 ; END DO |
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180 | misfkt(ji,jj) = jk-1 |
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181 | END DO |
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182 | END DO |
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183 | |
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184 | ELSE IF ( nn_isf == 4 ) THEN |
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185 | ! as in nn_isf == 1 |
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186 | rhisf_tbl(:,:) = rn_hisf_tbl |
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187 | misfkt(:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv |
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188 | |
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189 | ! load variable used in fldread (use for temporal interpolation of isf fwf forcing) |
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190 | ALLOCATE( sf_fwfisf(1), sf_qisf(1), STAT=ierror ) |
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191 | ALLOCATE( sf_fwfisf(1)%fnow(jpi,jpj,1), sf_fwfisf(1)%fdta(jpi,jpj,1,2) ) |
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192 | ALLOCATE( sf_qisf(1)%fnow(jpi,jpj,1), sf_qisf(1)%fdta(jpi,jpj,1,2) ) |
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193 | CALL fld_fill( sf_fwfisf, (/ sn_fwfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' ) |
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194 | !CALL fld_fill( sf_qisf , (/ sn_qisf /), cn_dirisf, 'sbc_isf_init', 'read heat flux isf data' , 'namsbc_isf' ) |
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195 | END IF |
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196 | |
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197 | ! save initial top boundary layer thickness |
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198 | rhisf_tbl_0(:,:) = rhisf_tbl(:,:) |
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199 | |
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200 | END IF |
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201 | |
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202 | ! ! ---------------------------------------- ! |
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203 | IF( kt /= nit000 ) THEN ! Swap of forcing fields ! |
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204 | ! ! ---------------------------------------- ! |
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205 | fwfisf_b (:,: ) = fwfisf (:,: ) ! Swap the ocean forcing fields except at nit000 |
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206 | risf_tsc_b(:,:,:) = risf_tsc(:,:,:) ! where before fields are set at the end of the routine |
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207 | ! |
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208 | ENDIF |
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209 | |
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210 | IF( MOD( kt-1, nn_fsbc) == 0 ) THEN |
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211 | |
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212 | ! compute bottom level of isf tbl and thickness of tbl below the ice shelf |
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213 | DO jj = 1,jpj |
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214 | DO ji = 1,jpi |
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215 | ikt = misfkt(ji,jj) |
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216 | ikb = misfkt(ji,jj) |
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217 | ! thickness of boundary layer at least the top level thickness |
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218 | rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), fse3t_n(ji,jj,ikt)) |
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219 | |
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220 | ! determine the deepest level influenced by the boundary layer |
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221 | DO jk = ikt, mbkt(ji,jj) |
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222 | IF ( (SUM(fse3t_n(ji,jj,ikt:jk-1)) .LT. rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk |
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223 | END DO |
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224 | rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(fse3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness. |
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225 | misfkb(ji,jj) = ikb ! last wet level of the tbl |
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226 | r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj) |
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227 | |
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228 | zhk = SUM( fse3t(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj) ! proportion of tbl cover by cell from ikt to ikb - 1 |
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229 | ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / fse3t(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer |
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230 | END DO |
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231 | END DO |
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232 | |
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233 | ! compute salf and heat flux |
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234 | IF (nn_isf == 1) THEN |
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235 | ! realistic ice shelf formulation |
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236 | ! compute T/S/U/V for the top boundary layer |
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237 | CALL sbc_isf_tbl(tsn(:,:,:,jp_tem),ttbl(:,:),'T') |
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238 | CALL sbc_isf_tbl(tsn(:,:,:,jp_sal),stbl(:,:),'T') |
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239 | CALL sbc_isf_tbl(un(:,:,:),utbl(:,:),'U') |
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240 | CALL sbc_isf_tbl(vn(:,:,:),vtbl(:,:),'V') |
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241 | ! iom print |
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242 | CALL iom_put('ttbl',ttbl(:,:)) |
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243 | CALL iom_put('stbl',stbl(:,:)) |
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244 | CALL iom_put('utbl',utbl(:,:)) |
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245 | CALL iom_put('vtbl',vtbl(:,:)) |
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246 | ! compute fwf and heat flux |
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247 | CALL sbc_isf_cav (kt) |
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248 | |
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249 | ELSE IF (nn_isf == 2) THEN |
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250 | ! Beckmann and Goosse parametrisation |
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251 | stbl(:,:) = soce |
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252 | CALL sbc_isf_bg03(kt) |
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253 | |
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254 | ELSE IF (nn_isf == 3) THEN |
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255 | ! specified runoff in depth (Mathiot et al., XXXX in preparation) |
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256 | CALL fld_read ( kt, nn_fsbc, sf_rnfisf ) |
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257 | fwfisf(:,:) = - sf_rnfisf(1)%fnow(:,:,1) ! fresh water flux from the isf (fwfisf <0 mean melting) |
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258 | |
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259 | IF( lk_oasis) THEN |
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260 | ! nn_coupled_iceshelf_fluxes uninitialised unless lk_oasis=true |
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261 | IF( nn_coupled_iceshelf_fluxes .gt. 0 ) THEN |
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262 | |
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263 | ! Adjust total iceshelf melt rates so that sum of iceberg calving and iceshelf melting in the northern |
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264 | ! and southern hemispheres equals rate of increase of mass of greenland and antarctic ice sheets |
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265 | ! to preserve total freshwater conservation in coupled models without an active ice sheet model. |
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266 | |
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267 | ! All related global sums must be done bit reproducibly |
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268 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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269 | |
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270 | ! use ABS function because we need to preserve the sign of fwfisf |
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271 | WHERE( greenland_icesheet_mask(:,:) == 1.0 ) & |
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272 | & fwfisf(:,:) = fwfisf(:,:) * ABS( greenland_icesheet_mass_rate_of_change * (1.0-rn_greenland_calving_fraction) & |
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273 | & / ( zgreenland_fwfisf_sum + 1.0e-10_wp ) ) |
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274 | |
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275 | ! check |
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276 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Greenland iceshelf melting climatology (kg/s) : ',zgreenland_fwfisf_sum |
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277 | |
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278 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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279 | |
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280 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Greenland iceshelf melting adjusted value (kg/s) : ',zgreenland_fwfisf_sum |
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281 | |
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282 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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283 | |
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284 | ! use ABS function because we need to preserve the sign of fwfisf |
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285 | WHERE( antarctica_icesheet_mask(:,:) == 1.0 ) & |
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286 | & fwfisf(:,:) = fwfisf(:,:) * ABS( antarctica_icesheet_mass_rate_of_change * (1.0-rn_antarctica_calving_fraction) & |
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287 | & / ( zantarctica_fwfisf_sum + 1.0e-10_wp ) ) |
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288 | |
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289 | ! check |
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290 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Antarctica iceshelf melting climatology (kg/s) : ',zantarctica_fwfisf_sum |
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291 | |
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292 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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293 | |
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294 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Antarctica iceshelf melting adjusted value (kg/s) : ',zantarctica_fwfisf_sum |
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295 | |
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296 | ENDIF |
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297 | ENDIF |
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298 | |
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299 | qisf(:,:) = fwfisf(:,:) * lfusisf ! heat flux |
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300 | stbl(:,:) = soce |
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301 | |
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302 | ELSE IF (nn_isf == 4) THEN |
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303 | ! specified fwf and heat flux forcing beneath the ice shelf |
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304 | CALL fld_read ( kt, nn_fsbc, sf_fwfisf ) |
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305 | !CALL fld_read ( kt, nn_fsbc, sf_qisf ) |
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306 | fwfisf(:,:) = sf_fwfisf(1)%fnow(:,:,1) ! fwf |
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307 | |
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308 | IF( lk_oasis) THEN |
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309 | ! nn_coupled_iceshelf_fluxes uninitialised unless lk_oasis=true |
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310 | IF( nn_coupled_iceshelf_fluxes .gt. 0 ) THEN |
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311 | |
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312 | ! Adjust total iceshelf melt rates so that sum of iceberg calving and iceshelf melting in the northern |
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313 | ! and southern hemispheres equals rate of increase of mass of greenland and antarctic ice sheets |
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314 | ! to preserve total freshwater conservation in coupled models without an active ice sheet model. |
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315 | |
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316 | ! All related global sums must be done bit reproducibly |
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317 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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318 | |
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319 | ! use ABS function because we need to preserve the sign of fwfisf |
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320 | WHERE( greenland_icesheet_mask(:,:) == 1.0 ) & |
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321 | & fwfisf(:,:) = fwfisf(:,:) * ABS( greenland_icesheet_mass_rate_of_change * (1.0-rn_greenland_calving_fraction) & |
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322 | & / ( zgreenland_fwfisf_sum + 1.0e-10_wp ) ) |
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323 | |
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324 | ! check |
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325 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Greenland iceshelf melting climatology (kg/s) : ',zgreenland_fwfisf_sum |
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326 | |
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327 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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328 | |
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329 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Greenland iceshelf melting adjusted value (kg/s) : ',zgreenland_fwfisf_sum |
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330 | |
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331 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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332 | |
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333 | ! use ABS function because we need to preserve the sign of fwfisf |
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334 | WHERE( antarctica_icesheet_mask(:,:) == 1.0 ) & |
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335 | & fwfisf(:,:) = fwfisf(:,:) * ABS( antarctica_icesheet_mass_rate_of_change * (1.0-rn_antarctica_calving_fraction) & |
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336 | & / ( zantarctica_fwfisf_sum + 1.0e-10_wp ) ) |
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337 | |
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338 | ! check |
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339 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Antarctica iceshelf melting climatology (kg/s) : ',zantarctica_fwfisf_sum |
---|
340 | |
---|
341 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
---|
342 | |
---|
343 | IF(lwp .AND. ll_wrtstp .AND. sn_cfctl%l_sbcisf) WRITE(numout, *) 'Antarctica iceshelf melting adjusted value (kg/s) : ',zantarctica_fwfisf_sum |
---|
344 | |
---|
345 | ENDIF |
---|
346 | ENDIF |
---|
347 | |
---|
348 | qisf(:,:) = fwfisf(:,:) * lfusisf ! heat flux |
---|
349 | !qisf(:,:) = sf_qisf(1)%fnow(:,:,1) ! heat flux |
---|
350 | stbl(:,:) = soce |
---|
351 | |
---|
352 | END IF |
---|
353 | ! compute tsc due to isf |
---|
354 | ! WARNING water add at temp = 0C, correction term is added, maybe better here but need a 3D variable). |
---|
355 | ! zpress = grav*rau0*fsdept(ji,jj,jk)*1.e-04 |
---|
356 | zt_frz = -1.9 !eos_fzp( tsn(ji,jj,jk,jp_sal), zpress ) |
---|
357 | risf_tsc(:,:,jp_tem) = qisf(:,:) * r1_rau0_rcp - rdivisf * fwfisf(:,:) * zt_frz * r1_rau0 ! |
---|
358 | |
---|
359 | ! salt effect already take into account in vertical advection |
---|
360 | risf_tsc(:,:,jp_sal) = (1.0_wp-rdivisf) * fwfisf(:,:) * stbl(:,:) * r1_rau0 |
---|
361 | |
---|
362 | ! output |
---|
363 | IF( iom_use('qlatisf' ) ) CALL iom_put('qlatisf', qisf) |
---|
364 | IF( iom_use('fwfisf' ) ) CALL iom_put('fwfisf' , fwfisf * stbl(:,:) / soce ) |
---|
365 | |
---|
366 | ! if apply only on the trend and not as a volume flux (rdivisf = 0), fwfisf have to be set to 0 now |
---|
367 | fwfisf(:,:) = rdivisf * fwfisf(:,:) |
---|
368 | |
---|
369 | ! lbclnk |
---|
370 | CALL lbc_lnk(risf_tsc(:,:,jp_tem),'T',1.) |
---|
371 | CALL lbc_lnk(risf_tsc(:,:,jp_sal),'T',1.) |
---|
372 | CALL lbc_lnk(fwfisf(:,:) ,'T',1.) |
---|
373 | CALL lbc_lnk(qisf(:,:) ,'T',1.) |
---|
374 | |
---|
375 | !============================================================================================================================================= |
---|
376 | IF ( iom_use('fwfisf3d') .OR. iom_use('qlatisf3d') .OR. iom_use('qhcisf3d') .OR. iom_use('qhcisf')) THEN |
---|
377 | CALL wrk_alloc( jpi,jpj,jpk, zfwfisf3d, zqhcisf3d, zqlatisf3d ) |
---|
378 | CALL wrk_alloc( jpi,jpj, zqhcisf2d ) |
---|
379 | |
---|
380 | zfwfisf3d(:,:,:) = 0.0_wp ! 3d ice shelf melting (kg/m2/s) |
---|
381 | zqhcisf3d(:,:,:) = 0.0_wp ! 3d heat content flux (W/m2) |
---|
382 | zqlatisf3d(:,:,:)= 0.0_wp ! 3d ice shelf melting latent heat flux (W/m2) |
---|
383 | zqhcisf2d(:,:) = fwfisf(:,:) * zt_frz * rcp ! 2d heat content flux (W/m2) |
---|
384 | |
---|
385 | DO jj = 1,jpj |
---|
386 | DO ji = 1,jpi |
---|
387 | ikt = misfkt(ji,jj) |
---|
388 | ikb = misfkb(ji,jj) |
---|
389 | DO jk = ikt, ikb - 1 |
---|
390 | zfwfisf3d (ji,jj,jk) = zfwfisf3d (ji,jj,jk) + fwfisf (ji,jj) * r1_hisf_tbl(ji,jj) * fse3t(ji,jj,jk) |
---|
391 | zqhcisf3d (ji,jj,jk) = zqhcisf3d (ji,jj,jk) + zqhcisf2d(ji,jj) * r1_hisf_tbl(ji,jj) * fse3t(ji,jj,jk) |
---|
392 | zqlatisf3d(ji,jj,jk) = zqlatisf3d(ji,jj,jk) + qisf (ji,jj) * r1_hisf_tbl(ji,jj) * fse3t(ji,jj,jk) |
---|
393 | END DO |
---|
394 | zfwfisf3d (ji,jj,jk) = zfwfisf3d (ji,jj,jk) + fwfisf (ji,jj) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) * fse3t(ji,jj,jk) |
---|
395 | zqhcisf3d (ji,jj,jk) = zqhcisf3d (ji,jj,jk) + zqhcisf2d(ji,jj) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) * fse3t(ji,jj,jk) |
---|
396 | zqlatisf3d(ji,jj,jk) = zqlatisf3d(ji,jj,jk) + qisf (ji,jj) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) * fse3t(ji,jj,jk) |
---|
397 | END DO |
---|
398 | END DO |
---|
399 | |
---|
400 | CALL iom_put('fwfisf3d' , zfwfisf3d (:,:,:)) |
---|
401 | CALL iom_put('qlatisf3d', zqlatisf3d(:,:,:)) |
---|
402 | CALL iom_put('qhcisf3d' , zqhcisf3d (:,:,:)) |
---|
403 | CALL iom_put('qhcisf' , zqhcisf2d (:,: )) |
---|
404 | |
---|
405 | CALL wrk_dealloc( jpi,jpj,jpk, zfwfisf3d, zqhcisf3d, zqlatisf3d ) |
---|
406 | CALL wrk_dealloc( jpi,jpj, zqhcisf2d ) |
---|
407 | END IF |
---|
408 | !============================================================================================================================================= |
---|
409 | |
---|
410 | IF( kt == nit000 ) THEN ! set the forcing field at nit000 - 1 ! |
---|
411 | IF( ln_rstart .AND. & ! Restart: read in restart file |
---|
412 | & iom_varid( numror, 'fwf_isf_b', ldstop = .FALSE. ) > 0 ) THEN |
---|
413 | IF(lwp) WRITE(numout,*) ' nit000-1 isf tracer content forcing fields read in the restart file' |
---|
414 | IF(lwp .AND. lflush) CALL flush(numout) |
---|
415 | CALL iom_get( numror, jpdom_autoglo, 'fwf_isf_b', fwfisf_b(:,:) ) ! before salt content isf_tsc trend |
---|
416 | CALL iom_get( numror, jpdom_autoglo, 'isf_sc_b', risf_tsc_b(:,:,jp_sal) ) ! before salt content isf_tsc trend |
---|
417 | CALL iom_get( numror, jpdom_autoglo, 'isf_hc_b', risf_tsc_b(:,:,jp_tem) ) ! before salt content isf_tsc trend |
---|
418 | ELSE |
---|
419 | fwfisf_b(:,:) = fwfisf(:,:) |
---|
420 | risf_tsc_b(:,:,:)= risf_tsc(:,:,:) |
---|
421 | END IF |
---|
422 | ENDIF |
---|
423 | ! |
---|
424 | END IF |
---|
425 | |
---|
426 | END SUBROUTINE sbc_isf |
---|
427 | |
---|
428 | INTEGER FUNCTION sbc_isf_alloc() |
---|
429 | !!---------------------------------------------------------------------- |
---|
430 | !! *** FUNCTION sbc_isf_rnf_alloc *** |
---|
431 | !!---------------------------------------------------------------------- |
---|
432 | sbc_isf_alloc = 0 ! set to zero if no array to be allocated |
---|
433 | IF( .NOT. ALLOCATED( qisf ) ) THEN |
---|
434 | ALLOCATE( risf_tsc(jpi,jpj,jpts), risf_tsc_b(jpi,jpj,jpts), qisf(jpi,jpj) , & |
---|
435 | & rhisf_tbl(jpi,jpj) , r1_hisf_tbl(jpi,jpj), rzisf_tbl(jpi,jpj) , & |
---|
436 | & ttbl(jpi,jpj) , stbl(jpi,jpj) , utbl(jpi,jpj) , & |
---|
437 | & vtbl(jpi, jpj) , risfLeff(jpi,jpj) , rhisf_tbl_0(jpi,jpj), & |
---|
438 | & ralpha(jpi,jpj) , misfkt(jpi,jpj) , misfkb(jpi,jpj) , & |
---|
439 | & STAT= sbc_isf_alloc ) |
---|
440 | ! |
---|
441 | IF( lk_mpp ) CALL mpp_sum ( sbc_isf_alloc ) |
---|
442 | IF( sbc_isf_alloc /= 0 ) CALL ctl_warn('sbc_isf_alloc: failed to allocate arrays.') |
---|
443 | ! |
---|
444 | ENDIF |
---|
445 | END FUNCTION |
---|
446 | |
---|
447 | SUBROUTINE sbc_isf_bg03(kt) |
---|
448 | !!========================================================================== |
---|
449 | !! *** SUBROUTINE sbcisf_bg03 *** |
---|
450 | !! add net heat and fresh water flux from ice shelf melting |
---|
451 | !! into the adjacent ocean using the parameterisation by |
---|
452 | !! Beckmann and Goosse (2003), "A parameterization of ice shelf-ocean |
---|
453 | !! interaction for climate models", Ocean Modelling 5(2003) 157-170. |
---|
454 | !! (hereafter BG) |
---|
455 | !!========================================================================== |
---|
456 | !!---------------------------------------------------------------------- |
---|
457 | !! sbc_isf_bg03 : routine called from sbcmod |
---|
458 | !!---------------------------------------------------------------------- |
---|
459 | !! |
---|
460 | !! ** Purpose : Add heat and fresh water fluxes due to ice shelf melting |
---|
461 | !! ** Reference : Beckmann et Goosse, 2003, Ocean Modelling |
---|
462 | !! |
---|
463 | !! History : |
---|
464 | !! ! 06-02 (C. Wang) Original code |
---|
465 | !!---------------------------------------------------------------------- |
---|
466 | |
---|
467 | INTEGER, INTENT ( in ) :: kt |
---|
468 | |
---|
469 | INTEGER :: ji, jj, jk, jish !temporary integer |
---|
470 | INTEGER :: ijkmin |
---|
471 | INTEGER :: ii, ij, ik |
---|
472 | INTEGER :: inum |
---|
473 | |
---|
474 | REAL(wp) :: zt_sum ! sum of the temperature between 200m and 600m |
---|
475 | REAL(wp) :: zt_ave ! averaged temperature between 200m and 600m |
---|
476 | REAL(wp) :: zt_frz ! freezing point temperature at depth z |
---|
477 | REAL(wp) :: zpress ! pressure to compute the freezing point in depth |
---|
478 | |
---|
479 | !!---------------------------------------------------------------------- |
---|
480 | IF ( nn_timing == 1 ) CALL timing_start('sbc_isf_bg03') |
---|
481 | ! |
---|
482 | |
---|
483 | ! This test is false only in the very first time step of a run (JMM ???- Initialy build to skip 1rst year of run ) |
---|
484 | DO ji = 1, jpi |
---|
485 | DO jj = 1, jpj |
---|
486 | ik = misfkt(ji,jj) |
---|
487 | !! Initialize arrays to 0 (each step) |
---|
488 | zt_sum = 0.e0_wp |
---|
489 | IF ( ik .GT. 1 ) THEN |
---|
490 | ! 3. -----------the average temperature between 200m and 600m --------------------- |
---|
491 | DO jk = misfkt(ji,jj),misfkb(ji,jj) |
---|
492 | ! freezing point temperature at ice shelf base BG eq. 2 (JMM sign pb ??? +7.64e-4 !!!) |
---|
493 | ! after verif with UNESCO, wrong sign in BG eq. 2 |
---|
494 | ! Calculate freezing temperature |
---|
495 | zpress = grav*rau0*fsdept(ji,jj,ik)*1.e-04 |
---|
496 | CALL eos_fzp(tsb(ji,jj,ik,jp_sal), zt_frz, zpress) |
---|
497 | zt_sum = zt_sum + (tsn(ji,jj,ik,jp_tem)-zt_frz) * fse3t(ji,jj,ik) * tmask(ji,jj,ik) ! sum temp |
---|
498 | ENDDO |
---|
499 | zt_ave = zt_sum/rhisf_tbl(ji,jj) ! calcul mean value |
---|
500 | |
---|
501 | ! 4. ------------Net heat flux and fresh water flux due to the ice shelf |
---|
502 | ! For those corresponding to zonal boundary |
---|
503 | qisf(ji,jj) = - rau0 * rcp * rn_gammat0 * risfLeff(ji,jj) * e1t(ji,jj) * zt_ave & |
---|
504 | & / (e1t(ji,jj) * e2t(ji,jj)) * tmask(ji,jj,ik) |
---|
505 | |
---|
506 | fwfisf(ji,jj) = qisf(ji,jj) / lfusisf !fresh water flux kg/(m2s) |
---|
507 | fwfisf(ji,jj) = fwfisf(ji,jj) * ( soce / stbl(ji,jj) ) |
---|
508 | !add to salinity trend |
---|
509 | ELSE |
---|
510 | qisf(ji,jj) = 0._wp ; fwfisf(ji,jj) = 0._wp |
---|
511 | END IF |
---|
512 | ENDDO |
---|
513 | ENDDO |
---|
514 | ! |
---|
515 | IF( nn_timing == 1 ) CALL timing_stop('sbc_isf_bg03') |
---|
516 | END SUBROUTINE sbc_isf_bg03 |
---|
517 | |
---|
518 | SUBROUTINE sbc_isf_cav( kt ) |
---|
519 | !!--------------------------------------------------------------------- |
---|
520 | !! *** ROUTINE sbc_isf_cav *** |
---|
521 | !! |
---|
522 | !! ** Purpose : handle surface boundary condition under ice shelf |
---|
523 | !! |
---|
524 | !! ** Method : - |
---|
525 | !! |
---|
526 | !! ** Action : utau, vtau : remain unchanged |
---|
527 | !! taum, wndm : remain unchanged |
---|
528 | !! qns : update heat flux below ice shelf |
---|
529 | !! emp, emps : update freshwater flux below ice shelf |
---|
530 | !!--------------------------------------------------------------------- |
---|
531 | INTEGER, INTENT(in) :: kt ! ocean time step |
---|
532 | ! |
---|
533 | LOGICAL :: ln_isomip = .true. |
---|
534 | REAL(wp), DIMENSION(:,:), POINTER :: zfrz,zpress,zti |
---|
535 | REAL(wp), DIMENSION(:,:), POINTER :: zgammat2d, zgammas2d |
---|
536 | !REAL(wp), DIMENSION(:,:), POINTER :: zqisf, zfwfisf |
---|
537 | REAL(wp) :: zlamb1, zlamb2, zlamb3 |
---|
538 | REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7 |
---|
539 | REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac |
---|
540 | REAL(wp) :: zfwflx, zhtflx, zhtflx_b |
---|
541 | REAL(wp) :: zgammat, zgammas |
---|
542 | REAL(wp) :: zeps = -1.e-20_wp !== Local constant initialization ==! |
---|
543 | INTEGER :: ji, jj ! dummy loop indices |
---|
544 | INTEGER :: ii0, ii1, ij0, ij1 ! temporary integers |
---|
545 | INTEGER :: ierror ! return error code |
---|
546 | LOGICAL :: lit=.TRUE. |
---|
547 | INTEGER :: nit |
---|
548 | !!--------------------------------------------------------------------- |
---|
549 | ! |
---|
550 | ! coeficient for linearisation of tfreez |
---|
551 | zlamb1=-0.0575 |
---|
552 | zlamb2=0.0901 |
---|
553 | zlamb3=-7.61e-04 |
---|
554 | IF( nn_timing == 1 ) CALL timing_start('sbc_isf_cav') |
---|
555 | ! |
---|
556 | CALL wrk_alloc( jpi,jpj, zfrz,zpress,zti, zgammat2d, zgammas2d ) |
---|
557 | |
---|
558 | zcfac=0.0_wp |
---|
559 | IF (ln_conserve) zcfac=1.0_wp |
---|
560 | zpress(:,:)=0.0_wp |
---|
561 | zgammat2d(:,:)=0.0_wp |
---|
562 | zgammas2d(:,:)=0.0_wp |
---|
563 | ! |
---|
564 | ! |
---|
565 | !CDIR COLLAPSE |
---|
566 | DO jj = 1, jpj |
---|
567 | DO ji = 1, jpi |
---|
568 | ! Crude approximation for pressure (but commonly used) |
---|
569 | ! 1e-04 to convert from Pa to dBar |
---|
570 | zpress(ji,jj)=grav*rau0*fsdepw(ji,jj,mikt(ji,jj))*1.e-04 |
---|
571 | ! |
---|
572 | END DO |
---|
573 | END DO |
---|
574 | |
---|
575 | ! Calculate in-situ temperature (ref to surface) |
---|
576 | zti(:,:)=tinsitu( ttbl, stbl, zpress ) |
---|
577 | ! Calculate freezing temperature |
---|
578 | CALL eos_fzp( sss_m(:,:), zfrz(:,:), zpress ) |
---|
579 | |
---|
580 | |
---|
581 | zhtflx=0._wp ; zfwflx=0._wp |
---|
582 | IF (nn_isfblk == 1) THEN |
---|
583 | DO jj = 1, jpj |
---|
584 | DO ji = 1, jpi |
---|
585 | IF (mikt(ji,jj) > 1 ) THEN |
---|
586 | nit = 1; lit = .TRUE.; zgammat=rn_gammat0; zgammas=rn_gammas0; zhtflx_b=0._wp |
---|
587 | DO WHILE ( lit ) |
---|
588 | ! compute gamma |
---|
589 | CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx, ji, jj, lit) |
---|
590 | ! zhtflx is upward heat flux (out of ocean) |
---|
591 | zhtflx = zgammat*rcp*rau0*(zti(ji,jj)-zfrz(ji,jj)) |
---|
592 | ! zwflx is upward water flux |
---|
593 | zfwflx = - zhtflx/lfusisf |
---|
594 | ! test convergence and compute gammat |
---|
595 | IF ( (zhtflx - zhtflx_b) .LE. 0.01 ) lit = .FALSE. |
---|
596 | |
---|
597 | nit = nit + 1 |
---|
598 | IF (nit .GE. 100) CALL ctl_stop( 'STOP', 'sbc_isf_hol99 : too many iteration ...' ) |
---|
599 | |
---|
600 | ! save gammat and compute zhtflx_b |
---|
601 | zgammat2d(ji,jj)=zgammat |
---|
602 | zhtflx_b = zhtflx |
---|
603 | END DO |
---|
604 | |
---|
605 | qisf(ji,jj) = - zhtflx |
---|
606 | ! For genuine ISOMIP protocol this should probably be something like |
---|
607 | fwfisf(ji,jj) = zfwflx * ( soce / MAX(stbl(ji,jj),zeps)) |
---|
608 | ELSE |
---|
609 | fwfisf(ji,jj) = 0._wp |
---|
610 | qisf(ji,jj) = 0._wp |
---|
611 | END IF |
---|
612 | ! |
---|
613 | END DO |
---|
614 | END DO |
---|
615 | |
---|
616 | ELSE IF (nn_isfblk == 2 ) THEN |
---|
617 | |
---|
618 | ! More complicated 3 equation thermodynamics as in MITgcm |
---|
619 | !CDIR COLLAPSE |
---|
620 | DO jj = 2, jpj |
---|
621 | DO ji = 2, jpi |
---|
622 | IF (mikt(ji,jj) > 1 ) THEN |
---|
623 | nit=1; lit=.TRUE.; zgammat=rn_gammat0; zgammas=rn_gammas0; zhtflx_b=0._wp; zhtflx=0._wp |
---|
624 | DO WHILE ( lit ) |
---|
625 | CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx, ji, jj, lit) |
---|
626 | |
---|
627 | zeps1=rcp*rau0*zgammat |
---|
628 | zeps2=lfusisf*rau0*zgammas |
---|
629 | zeps3=rhoisf*rcpi*kappa/risfdep(ji,jj) |
---|
630 | zeps4=zlamb2+zlamb3*risfdep(ji,jj) |
---|
631 | zeps6=zeps4-zti(ji,jj) |
---|
632 | zeps7=zeps4-tsurf |
---|
633 | zaqe=zlamb1 * (zeps1 + zeps3) |
---|
634 | zaqer=0.5/zaqe |
---|
635 | zbqe=zeps1*zeps6+zeps3*zeps7-zeps2 |
---|
636 | zcqe=zeps2*stbl(ji,jj) |
---|
637 | zdis=zbqe*zbqe-4.0*zaqe*zcqe |
---|
638 | ! Presumably zdis can never be negative because gammas is very small compared to gammat |
---|
639 | zsfrz=(-zbqe-SQRT(zdis))*zaqer |
---|
640 | IF (zsfrz .lt. 0.0) zsfrz=(-zbqe+SQRT(zdis))*zaqer |
---|
641 | zfrz(ji,jj)=zeps4+zlamb1*zsfrz |
---|
642 | |
---|
643 | ! zfwflx is upward water flux |
---|
644 | zfwflx= rau0 * zgammas * ( (zsfrz-stbl(ji,jj)) / zsfrz ) |
---|
645 | ! zhtflx is upward heat flux (out of ocean) |
---|
646 | ! If non conservative we have zcfac=0.0 so zhtflx is as ISOMIP but with different zfrz value |
---|
647 | zhtflx = ( zgammat*rau0 - zcfac*zfwflx ) * rcp * (zti(ji,jj) - zfrz(ji,jj) ) |
---|
648 | ! zwflx is upward water flux |
---|
649 | ! If non conservative we have zcfac=0.0 so what follows is then zfwflx*sss_m/zsfrz |
---|
650 | zfwflx = ( zgammas*rau0 - zcfac*zfwflx ) * (zsfrz - stbl(ji,jj)) / stbl(ji,jj) |
---|
651 | ! test convergence and compute gammat |
---|
652 | IF (( zhtflx - zhtflx_b) .LE. 0.01 ) lit = .FALSE. |
---|
653 | |
---|
654 | nit = nit + 1 |
---|
655 | IF (nit .GE. 51) THEN |
---|
656 | WRITE(numout,*) "sbcisf : too many iteration ... ", & |
---|
657 | & zhtflx, zhtflx_b, zgammat, zgammas, nn_gammablk, ji, jj, mikt(ji,jj), narea |
---|
658 | CALL ctl_stop( 'STOP', 'sbc_isf_hol99 : too many iteration ...' ) |
---|
659 | END IF |
---|
660 | ! save gammat and compute zhtflx_b |
---|
661 | zgammat2d(ji,jj)=zgammat |
---|
662 | zgammas2d(ji,jj)=zgammas |
---|
663 | zhtflx_b = zhtflx |
---|
664 | |
---|
665 | END DO |
---|
666 | ! If non conservative we have zcfac=0.0 so zhtflx is as ISOMIP but with different zfrz value |
---|
667 | qisf(ji,jj) = - zhtflx |
---|
668 | ! If non conservative we have zcfac=0.0 so what follows is then zfwflx*sss_m/zsfrz |
---|
669 | fwfisf(ji,jj) = zfwflx |
---|
670 | ELSE |
---|
671 | fwfisf(ji,jj) = 0._wp |
---|
672 | qisf(ji,jj) = 0._wp |
---|
673 | ENDIF |
---|
674 | ! |
---|
675 | END DO |
---|
676 | END DO |
---|
677 | ENDIF |
---|
678 | ! lbclnk |
---|
679 | CALL lbc_lnk(zgammas2d(:,:),'T',1.) |
---|
680 | CALL lbc_lnk(zgammat2d(:,:),'T',1.) |
---|
681 | ! output |
---|
682 | CALL iom_put('isfgammat', zgammat2d) |
---|
683 | CALL iom_put('isfgammas', zgammas2d) |
---|
684 | ! |
---|
685 | CALL wrk_dealloc( jpi,jpj, zfrz,zpress,zti, zgammat2d, zgammas2d ) |
---|
686 | ! |
---|
687 | IF( nn_timing == 1 ) CALL timing_stop('sbc_isf_cav') |
---|
688 | |
---|
689 | END SUBROUTINE sbc_isf_cav |
---|
690 | |
---|
691 | SUBROUTINE sbc_isf_gammats(gt, gs, zqhisf, zqwisf, ji, jj, lit ) |
---|
692 | !!---------------------------------------------------------------------- |
---|
693 | !! ** Purpose : compute the coefficient echange for heat flux |
---|
694 | !! |
---|
695 | !! ** Method : gamma assume constant or depends of u* and stability |
---|
696 | !! |
---|
697 | !! ** References : Holland and Jenkins, 1999, JPO, p1787-1800, eq 14 |
---|
698 | !! Jenkins et al., 2010, JPO, p2298-2312 |
---|
699 | !!--------------------------------------------------------------------- |
---|
700 | REAL(wp), INTENT(inout) :: gt, gs, zqhisf, zqwisf |
---|
701 | INTEGER , INTENT(in) :: ji,jj |
---|
702 | LOGICAL , INTENT(inout) :: lit |
---|
703 | |
---|
704 | INTEGER :: ikt ! loop index |
---|
705 | REAL(wp) :: zut, zvt, zustar ! U, V at T point and friction velocity |
---|
706 | REAL(wp) :: zdku, zdkv ! U, V shear |
---|
707 | REAL(wp) :: zPr, zSc, zRc ! Prandtl, Scmidth and Richardson number |
---|
708 | REAL(wp) :: zmob, zmols ! Monin Obukov length, coriolis factor at T point |
---|
709 | REAL(wp) :: zbuofdep, zhnu ! Bouyancy length scale, sublayer tickness |
---|
710 | REAL(wp) :: zhmax ! limitation of mol |
---|
711 | REAL(wp) :: zetastar ! stability parameter |
---|
712 | REAL(wp) :: zgmolet, zgmoles, zgturb ! contribution of modelecular sublayer and turbulence |
---|
713 | REAL(wp) :: zcoef ! temporary coef |
---|
714 | REAL(wp) :: zdep |
---|
715 | REAL(wp), PARAMETER :: zxsiN = 0.052 ! dimensionless constant |
---|
716 | REAL(wp), PARAMETER :: epsln = 1.0e-20 ! a small positive number |
---|
717 | REAL(wp), PARAMETER :: znu = 1.95e-6 ! kinamatic viscosity of sea water (m2.s-1) |
---|
718 | REAL(wp) :: rcs = 1.0e-3_wp ! conversion: mm/s ==> m/s |
---|
719 | REAL(wp), DIMENSION(2) :: zts, zab |
---|
720 | !!--------------------------------------------------------------------- |
---|
721 | ! |
---|
722 | IF( nn_gammablk == 0 ) THEN |
---|
723 | !! gamma is constant (specified in namelist) |
---|
724 | gt = rn_gammat0 |
---|
725 | gs = rn_gammas0 |
---|
726 | lit = .FALSE. |
---|
727 | ELSE IF ( nn_gammablk == 1 ) THEN |
---|
728 | !! gamma is assume to be proportional to u* |
---|
729 | !! WARNING in case of Losh 2008 tbl parametrization, |
---|
730 | !! you have to used the mean value of u in the boundary layer) |
---|
731 | !! not yet coded |
---|
732 | !! Jenkins et al., 2010, JPO, p2298-2312 |
---|
733 | ikt = mikt(ji,jj) |
---|
734 | !! Compute U and V at T points |
---|
735 | ! zut = 0.5 * ( utbl(ji-1,jj ) + utbl(ji,jj) ) |
---|
736 | ! zvt = 0.5 * ( vtbl(ji ,jj-1) + vtbl(ji,jj) ) |
---|
737 | zut = utbl(ji,jj) |
---|
738 | zvt = vtbl(ji,jj) |
---|
739 | |
---|
740 | !! compute ustar |
---|
741 | zustar = SQRT( rn_tfri2 * (zut * zut + zvt * zvt) ) |
---|
742 | !! Compute mean value over the TBL |
---|
743 | |
---|
744 | !! Compute gammats |
---|
745 | gt = zustar * rn_gammat0 |
---|
746 | gs = zustar * rn_gammas0 |
---|
747 | lit = .FALSE. |
---|
748 | ELSE IF ( nn_gammablk == 2 ) THEN |
---|
749 | !! gamma depends of stability of boundary layer |
---|
750 | !! WARNING in case of Losh 2008 tbl parametrization, |
---|
751 | !! you have to used the mean value of u in the boundary layer) |
---|
752 | !! not yet coded |
---|
753 | !! Holland and Jenkins, 1999, JPO, p1787-1800, eq 14 |
---|
754 | !! as MOL depends of flux and flux depends of MOL, best will be iteration (TO DO) |
---|
755 | ikt = mikt(ji,jj) |
---|
756 | |
---|
757 | !! Compute U and V at T points |
---|
758 | zut = 0.5 * ( utbl(ji-1,jj ) + utbl(ji,jj) ) |
---|
759 | zvt = 0.5 * ( vtbl(ji ,jj-1) + vtbl(ji,jj) ) |
---|
760 | |
---|
761 | !! compute ustar |
---|
762 | zustar = SQRT( rn_tfri2 * (zut * zut + zvt * zvt) ) |
---|
763 | IF (zustar == 0._wp) THEN ! only for kt = 1 I think |
---|
764 | gt = rn_gammat0 |
---|
765 | gs = rn_gammas0 |
---|
766 | ELSE |
---|
767 | !! compute Rc number (as done in zdfric.F90) |
---|
768 | zcoef = 0.5 / fse3w(ji,jj,ikt) |
---|
769 | ! ! shear of horizontal velocity |
---|
770 | zdku = zcoef * ( un(ji-1,jj ,ikt ) + un(ji,jj,ikt ) & |
---|
771 | & -un(ji-1,jj ,ikt+1) - un(ji,jj,ikt+1) ) |
---|
772 | zdkv = zcoef * ( vn(ji ,jj-1,ikt ) + vn(ji,jj,ikt ) & |
---|
773 | & -vn(ji ,jj-1,ikt+1) - vn(ji,jj,ikt+1) ) |
---|
774 | ! ! richardson number (minimum value set to zero) |
---|
775 | zRc = rn2(ji,jj,ikt+1) / ( zdku*zdku + zdkv*zdkv + 1.e-20 ) |
---|
776 | |
---|
777 | !! compute Pr and Sc number (can be improved) |
---|
778 | zPr = 13.8 |
---|
779 | zSc = 2432.0 |
---|
780 | |
---|
781 | !! compute gamma mole |
---|
782 | zgmolet = 12.5 * zPr ** (2.0/3.0) - 6.0 |
---|
783 | zgmoles = 12.5 * zSc ** (2.0/3.0) -6.0 |
---|
784 | |
---|
785 | !! compute bouyancy |
---|
786 | zts(jp_tem) = ttbl(ji,jj) |
---|
787 | zts(jp_sal) = stbl(ji,jj) |
---|
788 | zdep = fsdepw(ji,jj,ikt) |
---|
789 | ! |
---|
790 | CALL eos_rab( zts, zdep, zab ) |
---|
791 | ! |
---|
792 | !! compute length scale |
---|
793 | zbuofdep = grav * ( zab(jp_tem) * zqhisf - zab(jp_sal) * zqwisf ) !!!!!!!!!!!!!!!!!!!!!!!!!!!! |
---|
794 | |
---|
795 | !! compute Monin Obukov Length |
---|
796 | ! Maximum boundary layer depth |
---|
797 | zhmax = fsdept(ji,jj,mbkt(ji,jj)) - fsdepw(ji,jj,mikt(ji,jj)) -0.001 |
---|
798 | ! Compute Monin obukhov length scale at the surface and Ekman depth: |
---|
799 | zmob = zustar ** 3 / (vkarmn * (zbuofdep + epsln)) |
---|
800 | zmols = SIGN(1._wp, zmob) * MIN(ABS(zmob), zhmax) * tmask(ji,jj,ikt) |
---|
801 | |
---|
802 | !! compute eta* (stability parameter) |
---|
803 | zetastar = 1 / ( SQRT(1 + MAX(zxsiN * zustar / ( ABS(ff(ji,jj)) * zmols * zRc ), 0.0))) |
---|
804 | |
---|
805 | !! compute the sublayer thickness |
---|
806 | zhnu = 5 * znu / zustar |
---|
807 | !! compute gamma turb |
---|
808 | zgturb = 1/vkarmn * LOG(zustar * zxsiN * zetastar * zetastar / ( ABS(ff(ji,jj)) * zhnu )) & |
---|
809 | & + 1 / ( 2 * zxsiN * zetastar ) - 1/vkarmn |
---|
810 | |
---|
811 | !! compute gammats |
---|
812 | gt = zustar / (zgturb + zgmolet) |
---|
813 | gs = zustar / (zgturb + zgmoles) |
---|
814 | END IF |
---|
815 | END IF |
---|
816 | |
---|
817 | END SUBROUTINE |
---|
818 | |
---|
819 | SUBROUTINE sbc_isf_tbl( varin, varout, cptin ) |
---|
820 | !!---------------------------------------------------------------------- |
---|
821 | !! *** SUBROUTINE sbc_isf_tbl *** |
---|
822 | !! |
---|
823 | !! ** Purpose : compute mean T/S/U/V in the boundary layer |
---|
824 | !! |
---|
825 | !!---------------------------------------------------------------------- |
---|
826 | REAL(wp), DIMENSION(:,:,:), INTENT(in) :: varin |
---|
827 | REAL(wp), DIMENSION(:,:) , INTENT(out):: varout |
---|
828 | |
---|
829 | CHARACTER(len=1), INTENT(in) :: cptin ! point of variable in/out |
---|
830 | |
---|
831 | REAL(wp) :: ze3, zhk |
---|
832 | REAL(wp), DIMENSION(:,:), POINTER :: zikt |
---|
833 | |
---|
834 | INTEGER :: ji,jj,jk |
---|
835 | INTEGER :: ikt,ikb |
---|
836 | INTEGER, DIMENSION(:,:), POINTER :: mkt, mkb |
---|
837 | |
---|
838 | CALL wrk_alloc( jpi,jpj, mkt, mkb ) |
---|
839 | CALL wrk_alloc( jpi,jpj, zikt ) |
---|
840 | |
---|
841 | ! get first and last level of tbl |
---|
842 | mkt(:,:) = misfkt(:,:) |
---|
843 | mkb(:,:) = misfkb(:,:) |
---|
844 | |
---|
845 | varout(:,:)=0._wp |
---|
846 | DO jj = 2,jpj |
---|
847 | DO ji = 2,jpi |
---|
848 | IF (ssmask(ji,jj) == 1) THEN |
---|
849 | ikt = mkt(ji,jj) |
---|
850 | ikb = mkb(ji,jj) |
---|
851 | |
---|
852 | ! level fully include in the ice shelf boundary layer |
---|
853 | DO jk = ikt, ikb - 1 |
---|
854 | ze3 = fse3t_n(ji,jj,jk) |
---|
855 | IF (cptin == 'T' ) varout(ji,jj) = varout(ji,jj) + varin(ji,jj,jk) * r1_hisf_tbl(ji,jj) * ze3 |
---|
856 | IF (cptin == 'U' ) varout(ji,jj) = varout(ji,jj) + 0.5_wp * (varin(ji,jj,jk) + varin(ji-1,jj,jk)) & |
---|
857 | & * r1_hisf_tbl(ji,jj) * ze3 |
---|
858 | IF (cptin == 'V' ) varout(ji,jj) = varout(ji,jj) + 0.5_wp * (varin(ji,jj,jk) + varin(ji,jj-1,jk)) & |
---|
859 | & * r1_hisf_tbl(ji,jj) * ze3 |
---|
860 | END DO |
---|
861 | |
---|
862 | ! level partially include in ice shelf boundary layer |
---|
863 | zhk = SUM( fse3t_n(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj) |
---|
864 | IF (cptin == 'T') & |
---|
865 | & varout(ji,jj) = varout(ji,jj) + varin(ji,jj,ikb) * (1._wp - zhk) |
---|
866 | IF (cptin == 'U') & |
---|
867 | & varout(ji,jj) = varout(ji,jj) + 0.5_wp * (varin(ji,jj,ikb) + varin(ji-1,jj,ikb)) * (1._wp - zhk) |
---|
868 | IF (cptin == 'V') & |
---|
869 | & varout(ji,jj) = varout(ji,jj) + 0.5_wp * (varin(ji,jj,ikb) + varin(ji,jj-1,ikb)) * (1._wp - zhk) |
---|
870 | END IF |
---|
871 | END DO |
---|
872 | END DO |
---|
873 | |
---|
874 | CALL wrk_dealloc( jpi,jpj, mkt, mkb ) |
---|
875 | CALL wrk_dealloc( jpi,jpj, zikt ) |
---|
876 | |
---|
877 | IF (cptin == 'T') CALL lbc_lnk(varout,'T',1.) |
---|
878 | IF (cptin == 'U' .OR. cptin == 'V') CALL lbc_lnk(varout,'T',-1.) |
---|
879 | |
---|
880 | END SUBROUTINE sbc_isf_tbl |
---|
881 | |
---|
882 | |
---|
883 | SUBROUTINE sbc_isf_div( phdivn ) |
---|
884 | !!---------------------------------------------------------------------- |
---|
885 | !! *** SUBROUTINE sbc_isf_div *** |
---|
886 | !! |
---|
887 | !! ** Purpose : update the horizontal divergence with the runoff inflow |
---|
888 | !! |
---|
889 | !! ** Method : |
---|
890 | !! CAUTION : risf_tsc(:,:,jp_sal) is negative (outflow) increase the |
---|
891 | !! divergence and expressed in m/s |
---|
892 | !! |
---|
893 | !! ** Action : phdivn decreased by the runoff inflow |
---|
894 | !!---------------------------------------------------------------------- |
---|
895 | REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: phdivn ! horizontal divergence |
---|
896 | !! |
---|
897 | INTEGER :: ji, jj, jk ! dummy loop indices |
---|
898 | INTEGER :: ikt, ikb |
---|
899 | INTEGER :: nk_isf |
---|
900 | REAL(wp) :: zhk, z1_hisf_tbl, zhisf_tbl |
---|
901 | REAL(wp) :: zfact ! local scalar |
---|
902 | !!---------------------------------------------------------------------- |
---|
903 | ! |
---|
904 | zfact = 0.5_wp |
---|
905 | ! |
---|
906 | IF (lk_vvl) THEN ! need to re compute level distribution of isf fresh water |
---|
907 | DO jj = 1,jpj |
---|
908 | DO ji = 1,jpi |
---|
909 | ikt = misfkt(ji,jj) |
---|
910 | ikb = misfkt(ji,jj) |
---|
911 | ! thickness of boundary layer at least the top level thickness |
---|
912 | rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), fse3t(ji,jj,ikt)) |
---|
913 | |
---|
914 | ! determine the deepest level influenced by the boundary layer |
---|
915 | ! test on tmask useless ????? |
---|
916 | DO jk = ikt, mbkt(ji,jj) |
---|
917 | IF ( (SUM(fse3t(ji,jj,ikt:jk-1)) .LT. rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk |
---|
918 | END DO |
---|
919 | rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(fse3t(ji,jj,ikt:ikb))) ! limit the tbl to water thickness. |
---|
920 | misfkb(ji,jj) = ikb ! last wet level of the tbl |
---|
921 | r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj) |
---|
922 | |
---|
923 | zhk = SUM( fse3t(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj) ! proportion of tbl cover by cell from ikt to ikb - 1 |
---|
924 | ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / fse3t(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer |
---|
925 | END DO |
---|
926 | END DO |
---|
927 | END IF ! vvl case |
---|
928 | ! |
---|
929 | DO jj = 1,jpj |
---|
930 | DO ji = 1,jpi |
---|
931 | ikt = misfkt(ji,jj) |
---|
932 | ikb = misfkb(ji,jj) |
---|
933 | ! level fully include in the ice shelf boundary layer |
---|
934 | DO jk = ikt, ikb - 1 |
---|
935 | phdivn(ji,jj,jk) = phdivn(ji,jj,jk) + ( fwfisf(ji,jj) + fwfisf_b(ji,jj) ) & |
---|
936 | & * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact |
---|
937 | END DO |
---|
938 | ! level partially include in ice shelf boundary layer |
---|
939 | phdivn(ji,jj,ikb) = phdivn(ji,jj,ikb) + ( fwfisf(ji,jj) & |
---|
940 | & + fwfisf_b(ji,jj) ) * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact * ralpha(ji,jj) |
---|
941 | !== ice shelf melting mass distributed over several levels ==! |
---|
942 | END DO |
---|
943 | END DO |
---|
944 | ! |
---|
945 | END SUBROUTINE sbc_isf_div |
---|
946 | |
---|
947 | FUNCTION tinsitu( ptem, psal, ppress ) RESULT( pti ) |
---|
948 | !!---------------------------------------------------------------------- |
---|
949 | !! *** ROUTINE eos_init *** |
---|
950 | !! |
---|
951 | !! ** Purpose : Compute the in-situ temperature [Celcius] |
---|
952 | !! |
---|
953 | !! ** Method : |
---|
954 | !! |
---|
955 | !! Reference : Bryden,h.,1973,deep-sea res.,20,401-408 |
---|
956 | !!---------------------------------------------------------------------- |
---|
957 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: ptem ! potential temperature [Celcius] |
---|
958 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: psal ! salinity [psu] |
---|
959 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: ppress ! pressure [dBar] |
---|
960 | REAL(wp), DIMENSION(:,:), POINTER :: pti ! in-situ temperature [Celcius] |
---|
961 | ! REAL(wp) :: fsatg |
---|
962 | ! REAL(wp) :: pfps, pfpt, pfphp |
---|
963 | REAL(wp) :: zt, zs, zp, zh, zq, zxk |
---|
964 | INTEGER :: ji, jj ! dummy loop indices |
---|
965 | ! |
---|
966 | CALL wrk_alloc( jpi,jpj, pti ) |
---|
967 | ! |
---|
968 | DO jj=1,jpj |
---|
969 | DO ji=1,jpi |
---|
970 | zh = ppress(ji,jj) |
---|
971 | ! Theta1 |
---|
972 | zt = ptem(ji,jj) |
---|
973 | zs = psal(ji,jj) |
---|
974 | zp = 0.0 |
---|
975 | zxk= zh * fsatg( zs, zt, zp ) |
---|
976 | zt = zt + 0.5 * zxk |
---|
977 | zq = zxk |
---|
978 | ! Theta2 |
---|
979 | zp = zp + 0.5 * zh |
---|
980 | zxk= zh*fsatg( zs, zt, zp ) |
---|
981 | zt = zt + 0.29289322 * ( zxk - zq ) |
---|
982 | zq = 0.58578644 * zxk + 0.121320344 * zq |
---|
983 | ! Theta3 |
---|
984 | zxk= zh * fsatg( zs, zt, zp ) |
---|
985 | zt = zt + 1.707106781 * ( zxk - zq ) |
---|
986 | zq = 3.414213562 * zxk - 4.121320344 * zq |
---|
987 | ! Theta4 |
---|
988 | zp = zp + 0.5 * zh |
---|
989 | zxk= zh * fsatg( zs, zt, zp ) |
---|
990 | pti(ji,jj) = zt + ( zxk - 2.0 * zq ) / 6.0 |
---|
991 | END DO |
---|
992 | END DO |
---|
993 | ! |
---|
994 | CALL wrk_dealloc( jpi,jpj, pti ) |
---|
995 | ! |
---|
996 | END FUNCTION tinsitu |
---|
997 | ! |
---|
998 | FUNCTION fsatg( pfps, pfpt, pfphp ) |
---|
999 | !!---------------------------------------------------------------------- |
---|
1000 | !! *** FUNCTION fsatg *** |
---|
1001 | !! |
---|
1002 | !! ** Purpose : Compute the Adiabatic laspse rate [Celcius].[decibar]^-1 |
---|
1003 | !! |
---|
1004 | !! ** Reference : Bryden,h.,1973,deep-sea res.,20,401-408 |
---|
1005 | !! |
---|
1006 | !! ** units : pressure pfphp decibars |
---|
1007 | !! temperature pfpt deg celsius (ipts-68) |
---|
1008 | !! salinity pfps (ipss-78) |
---|
1009 | !! adiabatic fsatg deg. c/decibar |
---|
1010 | !!---------------------------------------------------------------------- |
---|
1011 | REAL(wp) :: pfps, pfpt, pfphp |
---|
1012 | REAL(wp) :: fsatg |
---|
1013 | ! |
---|
1014 | fsatg = (((-2.1687e-16*pfpt+1.8676e-14)*pfpt-4.6206e-13)*pfphp & |
---|
1015 | & +((2.7759e-12*pfpt-1.1351e-10)*(pfps-35.)+((-5.4481e-14*pfpt & |
---|
1016 | & +8.733e-12)*pfpt-6.7795e-10)*pfpt+1.8741e-8))*pfphp & |
---|
1017 | & +(-4.2393e-8*pfpt+1.8932e-6)*(pfps-35.) & |
---|
1018 | & +((6.6228e-10*pfpt-6.836e-8)*pfpt+8.5258e-6)*pfpt+3.5803e-5 |
---|
1019 | ! |
---|
1020 | END FUNCTION fsatg |
---|
1021 | !!====================================================================== |
---|
1022 | END MODULE sbcisf |
---|