1 | MODULE sbcblk_core |
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2 | !!====================================================================== |
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3 | !! *** MODULE sbcblk_core *** |
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4 | !! Ocean forcing: momentum, heat and freshwater flux formulation |
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5 | !!===================================================================== |
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6 | !! History : 9.0 ! 04-08 (U. Schweckendiek) Original code |
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7 | !! ! 05-04 (L. Brodeau, A.M. Treguier) additions: |
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8 | !! - new bulk routine for efficiency |
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9 | !! - WINDS ARE NOW ASSUMED TO BE AT T POINTS in input files !!!! |
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10 | !! - file names and file characteristics in namelist |
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11 | !! - Implement reading of 6-hourly fields |
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12 | !! ! 06-06 (G. Madec) sbc rewritting |
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13 | !!---------------------------------------------------------------------- |
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14 | |
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15 | !!---------------------------------------------------------------------- |
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16 | !! sbc_blk_core : bulk formulation as ocean surface boundary condition |
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17 | !! (forced mode, CORE bulk formulea) |
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18 | !! blk_oce_core : ocean: computes momentum, heat and freshwater fluxes |
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19 | !! blk_ice_core : ice : computes momentum, heat and freshwater fluxes |
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20 | !! turb_core : computes the CORE turbulent transfer coefficients |
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21 | !!---------------------------------------------------------------------- |
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22 | USE oce ! ocean dynamics and tracers |
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23 | USE dom_oce ! ocean space and time domain |
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24 | USE phycst ! physical constants |
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25 | USE daymod ! calendar |
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26 | USE ocfzpt ! ocean freezing point |
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27 | USE fldread ! read input fields |
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28 | USE sbc_oce ! Surface boundary condition: ocean fields |
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29 | USE iom ! I/O manager library |
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30 | USE in_out_manager ! I/O manager |
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31 | USE lib_mpp ! distribued memory computing library |
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32 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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33 | |
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34 | IMPLICIT NONE |
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35 | PRIVATE |
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36 | |
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37 | PUBLIC sbc_blk_core ! routine called in sbcmod module |
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38 | PUBLIC blk_ice_core ! routine called in sbc_ice_lim module |
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39 | |
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40 | INTEGER , PARAMETER :: jpfld = 8 ! maximum number of files to read |
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41 | INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point |
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42 | INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point |
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43 | INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( % ) |
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44 | INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2) |
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45 | INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2) |
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46 | INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin) |
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47 | INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s) |
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48 | INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s) |
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49 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read) |
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50 | |
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51 | !! * CORE bulk parameters |
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52 | REAL(wp), PARAMETER :: rhoa = 1.22 ! air density |
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53 | REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air |
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54 | REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization |
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55 | REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation |
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56 | REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant |
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57 | REAL(wp), PARAMETER :: Cice = 1.63e-3 ! transfer coefficient over ice |
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58 | |
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59 | !! * Substitutions |
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60 | # include "domzgr_substitute.h90" |
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61 | # include "vectopt_loop_substitute.h90" |
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62 | !!---------------------------------------------------------------------- |
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63 | !! OPA 9.0 , LOCEAN-IPSL (2006) |
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64 | !! $Header: $ |
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65 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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66 | !!---------------------------------------------------------------------- |
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67 | |
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68 | CONTAINS |
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69 | |
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70 | SUBROUTINE sbc_blk_core( kt ) |
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71 | !!--------------------------------------------------------------------- |
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72 | !! *** ROUTINE sbc_blk_core *** |
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73 | !! |
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74 | !! ** Purpose : provide at each time step the surface ocean fluxes |
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75 | !! (momentum, heat, freshwater and runoff) |
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76 | !! |
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77 | !! ** Method : READ each fluxes in NetCDF files |
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78 | !! The i-component of the stress utau (N/m2) |
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79 | !! The j-component of the stress vtau (N/m2) |
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80 | !! the net downward heat flux qtot (watt/m2) |
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81 | !! the net downward radiative flux qsr (watt/m2) |
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82 | !! the net upward water (evapo - precip) emp (kg/m2/s) |
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83 | !! Assumptions made: |
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84 | !! - each file content an entire year (read record, not the time axis) |
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85 | !! - first and last record are part of the previous and next year |
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86 | !! (useful for time interpolation) |
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87 | !! - the number of records is 2 + 365*24 / freqh(jf) |
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88 | !! or 366 in leap year case |
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89 | !! |
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90 | !! C A U T I O N : never mask the surface stress fields |
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91 | !! the stress is assumed to be in the mesh referential |
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92 | !! i.e. the (i,j) referential |
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93 | !! |
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94 | !! ** Action : defined at each time-step at the air-sea interface |
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95 | !! - utau & vtau : stress components in geographical ref. |
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96 | !! - qns & qsr : non solar and solar heat fluxes |
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97 | !! - emp : evap - precip (volume flux) |
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98 | !! - emps : evap - precip (concentration/dillution) |
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99 | !!---------------------------------------------------------------------- |
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100 | INTEGER, INTENT( in ) :: kt ! ocean time step |
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101 | !! |
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102 | INTEGER :: jf ! dummy indices |
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103 | INTEGER :: ierror ! return error code |
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104 | !! |
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105 | CHARACTER(len=100) :: cn_dir ! Root directory for location of core files |
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106 | TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read |
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107 | TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read |
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108 | TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow ! " " |
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109 | NAMELIST/namsbc_core/ cn_dir, sn_wndi, sn_wndj, sn_humi, sn_qsr, & |
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110 | & sn_qlw , sn_tair, sn_prec, sn_snow |
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111 | !!--------------------------------------------------------------------- |
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112 | |
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113 | ! ! ====================== ! |
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114 | IF( kt == nit000 ) THEN ! First call kt=nit000 ! |
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115 | ! ! ====================== ! |
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116 | ! set file information (default values) |
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117 | cn_dir = './' ! directory in which the model is executed |
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118 | |
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119 | ! (NB: frequency positive => hours, negative => months) |
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120 | ! ! file ! frequency ! variable ! time intep ! clim ! starting ! |
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121 | ! ! name ! (hours) ! name ! (T/F) ! (0/1) ! record ! |
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122 | sn_wndi = FLD_N( 'uwnd10m' , 24. , 'u_10' , .FALSE. , 0 , 0 ) |
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123 | sn_wndj = FLD_N( 'vwnd10m' , 24. , 'v_10' , .FALSE. , 0 , 0 ) |
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124 | sn_qsr = FLD_N( 'qsw' , 24. , 'qsw' , .FALSE. , 0 , 0 ) |
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125 | sn_qlw = FLD_N( 'qlw' , 24. , 'qlw' , .FALSE. , 0 , 0 ) |
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126 | sn_tair = FLD_N( 'tair10m' , 24. , 't_10' , .FALSE. , 0 , 0 ) |
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127 | sn_humi = FLD_N( 'humi10m' , 24. , 'q_10' , .FALSE. , 0 , 0 ) |
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128 | sn_prec = FLD_N( 'precip' , -12. , 'precip' , .TRUE. , 0 , 0 ) |
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129 | sn_snow = FLD_N( 'snow' , -12. , 'snow' , .TRUE. , 0 , 0 ) |
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130 | |
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131 | REWIND( numnam ) ! ... read in namlist namsbc_core |
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132 | READ ( numnam, namsbc_core ) |
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133 | |
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134 | ! store namelist information in an array |
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135 | slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj |
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136 | slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw |
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137 | slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi |
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138 | slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow |
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139 | |
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140 | ! set sf structure |
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141 | ALLOCATE( sf(jpfld), STAT=ierror ) |
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142 | IF( ierror > 0 ) THEN |
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143 | CALL ctl_stop( 'sbc_blk_core: unable to allocate sf structure' ) ; RETURN |
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144 | ENDIF |
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145 | |
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146 | DO jf = 1, jpfld |
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147 | WRITE(sf(jf)%clrootname,'(a,a)' ) TRIM( cn_dir ), TRIM( slf_i(jf)%clname ) |
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148 | sf(jf)%freqh = slf_i(jf)%freqh |
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149 | sf(jf)%clvar = slf_i(jf)%clvar |
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150 | sf(jf)%ln_tint = slf_i(jf)%ln_tint |
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151 | sf(jf)%nclim = slf_i(jf)%nclim |
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152 | sf(jf)%nstrec = slf_i(jf)%nstrec |
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153 | END DO |
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154 | |
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155 | IF(lwp) THEN ! control print |
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156 | WRITE(numout,*) |
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157 | WRITE(numout,*) 'sbc_blk_core : flux formulattion for ocean surface boundary condition' |
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158 | WRITE(numout,*) '~~~~~~~~~~~~ ' |
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159 | WRITE(numout,*) ' namsbc_core Namelist' |
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160 | WRITE(numout,*) ' list of files and frequency (>0: in hours ; <0 in months)' |
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161 | DO jf = 1, jpfld |
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162 | WRITE(numout,*) ' file root name: ' , TRIM( sf(jf)%clrootname ), & |
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163 | & ' variable name: ' , TRIM( sf(jf)%clvar ) |
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164 | WRITE(numout,*) ' frequency: ' , sf(jf)%freqh , & |
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165 | & ' time interp: ' , sf(jf)%ln_tint , & |
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166 | & ' climatology: ' , sf(jf)%nclim , & |
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167 | & ' starting record: ', sf(jf)%nstrec |
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168 | END DO |
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169 | ENDIF |
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170 | ! |
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171 | ENDIF |
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172 | |
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173 | CALL fld_read( kt, nn_fsbc, sf ) ! Read input fields and provides the |
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174 | ! ! input fields at the current time-step |
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175 | |
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176 | !!gm IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN |
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177 | |
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178 | CALL blk_oce_core( sst_m, ssu_m, ssv_m ) ! set the ocean surface fluxes |
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179 | |
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180 | !!gm ENDIF |
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181 | ! ! using CORE bulk formulea |
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182 | END SUBROUTINE sbc_blk_core |
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183 | |
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184 | |
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185 | SUBROUTINE blk_oce_core( pst, pu, pv ) |
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186 | !!--------------------------------------------------------------------- |
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187 | !! *** ROUTINE blk_core *** |
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188 | !! |
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189 | !! ** Purpose : provide the momentum, heat and freshwater fluxes at |
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190 | !! the ocean surface at each time step |
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191 | !! |
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192 | !! ** Method : CORE bulk formulea for the ocean using atmospheric |
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193 | !! fields read in sbc_read |
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194 | !! |
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195 | !! ** Outputs : - utau : i-component of the stress at U-point (N/m2) |
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196 | !! - vtau : j-component of the stress at V-point (N/m2) |
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197 | !! - qsr_oce : Solar heat flux over the ocean (W/m2) |
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198 | !! - qns_oce : Non Solar heat flux over the ocean (W/m2) |
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199 | !! - evap : Evaporation over the ocean (kg/m2/s) |
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200 | !! - tprecip : Total precipitation (Kg/m2/s) |
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201 | !! - sprecip : Solid precipitation (Kg/m2/s) |
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202 | !!--------------------------------------------------------------------- |
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203 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: pst ! surface temperature [Celcius] |
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204 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: pu ! surface current at U-point (i-component) [m/s] |
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205 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: pv ! surface current at V-point (j-component) [m/s] |
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206 | |
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207 | INTEGER :: ji, jj ! dummy loop indices |
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208 | REAL(wp) :: zcoef_qsatw |
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209 | REAL(wp), DIMENSION(jpi,jpj) :: zwnd_i, zwnd_j ! wind speed components at T-point |
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210 | REAL(wp), DIMENSION(jpi,jpj) :: zwind_speed_t ! wind speed module at T-point ( = | U10m - Uoce | ) |
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211 | REAL(wp), DIMENSION(jpi,jpj) :: zqsatw ! specific humidity at pst |
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212 | REAL(wp), DIMENSION(jpi,jpj) :: zqlw, zqsb ! long wave and sensible heat fluxes |
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213 | REAL(wp), DIMENSION(jpi,jpj) :: zqla, zevap ! latent heat fluxes and evaporation |
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214 | REAL(wp), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau) |
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215 | REAL(wp), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens) |
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216 | REAL(wp), DIMENSION(jpi,jpj) :: Ce ! tansfert coefficient for evaporation (Q_lat) |
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217 | REAL(wp), DIMENSION(jpi,jpj) :: zst ! surface temperature in Kelvin |
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218 | !!--------------------------------------------------------------------- |
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219 | |
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220 | ! local scalars ( place there for vector optimisation purposes) |
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221 | zcoef_qsatw = 0.98 * 640380. / rhoa |
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222 | |
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223 | zst(:,:) = pst(:,:) + rt0 ! converte Celcius to Kelvin (and set minimum value far above 0 K) |
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224 | |
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225 | ! ----------------------------------------------------------------------------- ! |
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226 | ! 0 Wind components and module at T-point relative to the moving ocean ! |
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227 | ! ----------------------------------------------------------------------------- ! |
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228 | ! ... components ( U10m - U_oce ) at T-point (unmasked) |
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229 | zwnd_i(:,:) = 0.e0 |
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230 | zwnd_j(:,:) = 0.e0 |
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231 | #if defined key_vectopt_loop |
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232 | !CDIR COLLAPSE |
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233 | #endif |
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234 | DO jj = 2, jpjm1 |
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235 | DO ji = fs_2, fs_jpim1 ! vect. opt. |
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236 | zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj) - 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) ) |
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237 | zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj) - 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) ) |
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238 | END DO |
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239 | END DO |
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240 | CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. ) |
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241 | CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. ) |
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242 | ! ... scalar wind ( = | U10m - U_oce | ) at T-point (masked) |
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243 | !CDIR NOVERRCHK |
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244 | !CDIR COLLAPSE |
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245 | zwind_speed_t(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) & |
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246 | & + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1) |
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247 | |
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248 | ! ----------------------------------------------------------------------------- ! |
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249 | ! I Radiative FLUXES ! |
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250 | ! ----------------------------------------------------------------------------- ! |
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251 | |
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252 | ! ocean albedo assumed to be 0.066 |
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253 | !CDIR COLLAPSE |
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254 | qsr (:,:) = ( 1. - 0.066 ) * sf(jp_qsr)%fnow(:,:) * tmask(:,:,1) ! Short Wave |
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255 | !CDIR COLLAPSE |
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256 | zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:) - Stef * zst(:,:)*zst(:,:)*zst(:,:)*zst(:,:) ) * tmask(:,:,1) ! Long Wave |
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257 | |
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258 | ! ----------------------------------------------------------------------------- ! |
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259 | ! II Turbulent FLUXES ! |
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260 | ! ----------------------------------------------------------------------------- ! |
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261 | |
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262 | ! ... specific humidity at SST and IST |
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263 | !CDIR NOVERRCHK |
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264 | !CDIR COLLAPSE |
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265 | zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) ) |
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266 | |
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267 | ! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point : |
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268 | !!gm bug? a the compiling phase, add a copy in temporary arrays... ==> check perf! |
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269 | ! CALL TURB_CORE( 10., zst (:,:), sf(jp_tair)%fnow(:,:), & |
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270 | ! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), zwind_speed_t(:,:), & |
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271 | ! & Cd(:,:), Ch(:,:), Ce(:,:) ) |
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272 | !!gm end |
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273 | CALL TURB_CORE( 10., zst , sf(jp_tair)%fnow, & |
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274 | & zqsatw, sf(jp_humi)%fnow, zwind_speed_t, & |
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275 | & Cd, Ch, Ce ) |
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276 | |
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277 | ! ... umasked Momentum : utau, vtau at U- and V_points, resp. |
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278 | ! Note the use of 2-tmask in order to umask the stress along coastlines |
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279 | zwnd_i(:,:) = rhoa * zwind_speed_t(:,:) * Cd(:,:) * zwnd_i(:,:) |
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280 | zwnd_j(:,:) = rhoa * zwind_speed_t(:,:) * Cd(:,:) * zwnd_j(:,:) |
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281 | DO jj = 1, jpjm1 |
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282 | DO ji = 1, fs_jpim1 |
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283 | utau(ji,jj) = 0.5 * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) ) * ( 2. - tmask(ji,jj,1) ) |
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284 | vtau(ji,jj) = 0.5 * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) ) * ( 2. - tmask(ji,jj,1) ) |
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285 | END DO |
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286 | END DO |
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287 | CALL lbc_lnk( utau(:,:), 'U', -1. ) |
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288 | CALL lbc_lnk( vtau(:,:), 'V', -1. ) |
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289 | |
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290 | ! Turbulent fluxes over ocean |
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291 | ! ----------------------------- |
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292 | !CDIR COLLAPSE |
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293 | zevap(:,:) = rhoa *Ce(:,:)*( zqsatw(:,:) - sf(jp_humi)%fnow(:,:) ) * zwind_speed_t(:,:) ! Evaporation |
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294 | !CDIR COLLAPSE |
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295 | zqsb (:,:) = rhoa*cpa*Ch(:,:)*( zst (:,:) - sf(jp_tair)%fnow(:,:) ) * zwind_speed_t(:,:) ! Sensible Heat |
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296 | !CDIR COLLAPSE |
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297 | zqla (:,:) = Lv * zevap(:,:) ! Latent Heat |
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298 | |
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299 | |
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300 | ! ----------------------------------------------------------------------------- ! |
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301 | ! III Total FLUXES ! |
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302 | ! ----------------------------------------------------------------------------- ! |
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303 | |
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304 | !CDIR COLLAPSE |
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305 | qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) ! Downward Non Solar flux |
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306 | |
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307 | !CDIR COLLAPSE |
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308 | emp (:,:) = zevap(:,:) - sf(jp_prec)%fnow(:,:) * tmask(:,:,1) |
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309 | !CDIR COLLAPSE |
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310 | emps(:,:) = zevap(:,:) - sf(jp_prec)%fnow(:,:) * tmask(:,:,1) |
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311 | ! |
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312 | END SUBROUTINE blk_oce_core |
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313 | |
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314 | |
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315 | SUBROUTINE blk_ice_core( pst , pui , pvi , palb , & |
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316 | & p_taui, p_tauj, p_qns , p_qsr, & |
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317 | & p_qla , p_dqns, p_dqla, & |
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318 | & p_tpr , p_spr , & |
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319 | & p_fr1 , p_fr2 ) |
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320 | !!--------------------------------------------------------------------- |
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321 | !! *** ROUTINE blk_ice_core *** |
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322 | !! |
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323 | !! ** Purpose : provide the surface boundary condition over sea-ice |
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324 | !! |
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325 | !! ** Method : compute momentum, heat and freshwater exchanged |
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326 | !! between atmosphere and sea-ice using CORE bulk |
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327 | !! formulea, ice variables and read atmmospheric fields. |
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328 | !! NB: ice drag coefficient is assumed to be a constant |
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329 | !! |
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330 | !! caution : the net upward water flux has with mm/day unit |
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331 | !!--------------------------------------------------------------------- |
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332 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin] |
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333 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: pui ! ice surface velocity (i-component, I-point) [m/s] |
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334 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: pvi ! ice surface velocity (j-component, I-point) [m/s] |
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335 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%] |
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336 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_taui ! surface ice stress at I-point (i-component) [N/m2] |
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337 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_tauj ! surface ice stress at I-point (j-component) [N/m2] |
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338 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_qns ! non solar heat flux over ice (T-point) [W/m2] |
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339 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_qsr ! solar heat flux over ice (T-point) [W/m2] |
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340 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_qla ! latent heat flux over ice (T-point) [W/m2] |
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341 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2] |
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342 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_dqla ! latent heat sensistivity (T-point) [W/m2] |
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343 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_tpr ! total precipitation (T-point) [Kg/m2/s] |
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344 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_spr ! solid precipitation (T-point) [Kg/m2/s] |
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345 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_fr1 ! 1sr fraction of qsr penetration in ice [%] |
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346 | REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: p_fr2 ! 2nd fraction of qsr penetration in ice [%] |
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347 | !! |
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348 | INTEGER :: ji, jj ! dummy loop indices |
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349 | REAL(wp) :: zst3 |
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350 | REAL(wp) :: zcoef_wnorm, zcoef_dqlw, zcoef_dqla, zcoef_dqsb, zcoef_fr12 |
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351 | REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point |
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352 | REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point |
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353 | REAL(wp), DIMENSION(jpi,jpj) :: z_wnds_t ! wind speed ( = | U10m - U_ice | ) at T-point |
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354 | REAL(wp), DIMENSION(jpi,jpj) :: z_qlw ! long wave heat flux over ice |
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355 | REAL(wp), DIMENSION(jpi,jpj) :: z_qsb ! sensible heat flux over ice |
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356 | REAL(wp), DIMENSION(jpi,jpj) :: z_dqlw ! sensible heat flux over ice |
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357 | REAL(wp), DIMENSION(jpi,jpj) :: z_dqsb ! sensible heat flux over ice |
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358 | !!--------------------------------------------------------------------- |
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359 | |
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360 | ! local scalars ( place there for vector optimisation purposes) |
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361 | zcoef_wnorm = rhoa * Cice |
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362 | zcoef_dqlw = 4.0 * 0.95 * Stef |
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363 | zcoef_dqla = -Ls * Cice * 0.98 * 11637800. / (rhoa*rhoa) * (-5897.8) |
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364 | zcoef_dqsb = rhoa * cpa * Cice |
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365 | zcoef_fr12 = 1.0 - 0.3 !!!gm ??? ! sf(jp_snow)%fnow(:,:) |
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366 | |
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367 | !!gm brutal.... |
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368 | z_wnds_t(:,:) = 0.e0 |
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369 | p_taui (:,:) = 0.e0 |
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370 | p_tauj (:,:) = 0.e0 |
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371 | !!gm end |
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372 | |
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373 | ! ----------------------------------------------------------------------------- ! |
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374 | ! Wind components and module relative to the moving ocean at I and T-point ! |
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375 | ! ----------------------------------------------------------------------------- ! |
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376 | ! ... components ( U10m - U_oce ) at I-point (F-point with sea-ice indexation) (unmasked) |
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377 | ! and scalar wind at T-point ( = | U10m - U_ice | ) (masked) |
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378 | #if defined key_vectopt_loop |
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379 | !CDIR COLLAPSE |
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380 | #endif |
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381 | !CDIR NOVERRCHK |
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382 | DO jj = 2, jpjm1 |
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383 | DO ji = fs_2, fs_jpim1 |
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384 | ! ... scalar wind at I-point (fld being at T-point) |
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385 | zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ) + sf(jp_wndi)%fnow(ji ,jj ) & |
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386 | & + sf(jp_wndi)%fnow(ji-1,jj-1) + sf(jp_wndi)%fnow(ji ,jj-1) ) - pui(ji,jj) |
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387 | zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ) + sf(jp_wndj)%fnow(ji ,jj ) & |
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388 | & + sf(jp_wndj)%fnow(ji-1,jj-1) + sf(jp_wndj)%fnow(ji ,jj-1) ) - pvi(ji,jj) |
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389 | zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f ) |
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390 | ! ... ice stress at I-point |
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391 | p_taui(ji,jj) = zwnorm_f * zwndi_f |
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392 | p_tauj(ji,jj) = zwnorm_f * zwndj_f |
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393 | ! ... scalar wind at T-point (fld being at T-point) |
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394 | zwndi_t = sf(jp_wndi)%fnow(ji,jj) - 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) & |
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395 | & + pui(ji,jj ) + pui(ji+1,jj ) ) |
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396 | zwndj_t = sf(jp_wndj)%fnow(ji,jj) - 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) & |
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397 | & + pvi(ji,jj ) + pvi(ji+1,jj ) ) |
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398 | z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1) |
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399 | END DO |
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400 | END DO |
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401 | CALL lbc_lnk( p_taui , 'I', -1. ) |
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402 | CALL lbc_lnk( p_tauj , 'I', -1. ) |
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403 | CALL lbc_lnk( z_wnds_t, 'T', 1. ) |
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404 | |
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405 | ! ----------------------------------------------------------------------------- ! |
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406 | ! I Radiative FLUXES ! |
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407 | ! ----------------------------------------------------------------------------- ! |
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408 | !CDIR COLLAPSE |
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409 | DO jj = 1, jpj |
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410 | DO ji = 1, jpi |
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411 | zst3 = pst(ji,jj) * pst(ji,jj) * pst(ji,jj) |
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412 | p_qsr(ji,jj) = ( 1. - palb(ji,jj) ) * sf(jp_qsr)%fnow(ji,jj) * tmask(ji,jj,1) ! Short Wave (sw) |
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413 | z_qlw(ji,jj) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj) & ! Long Wave (lw) |
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414 | & - Stef * pst(ji,jj) * zst3 ) * tmask(ji,jj,1) |
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415 | z_dqlw(ji,jj) = zcoef_dqlw * zst3 ! lw sensitivity |
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416 | END DO |
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417 | END DO |
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418 | |
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419 | ! ----------------------------------------------------------------------------- ! |
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420 | ! II Turbulent FLUXES ! |
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421 | ! ----------------------------------------------------------------------------- ! |
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422 | |
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423 | ! ... turbulent heat fluxes |
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424 | !CDIR COLLAPSE |
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425 | z_qsb(:,:) = rhoa * cpa * Cice * z_wnds_t(:,:) * ( pst(:,:) - sf(jp_tair)%fnow(:,:) ) ! Sensible Heat |
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426 | !CDIR NOVERRCHK |
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427 | !CDIR COLLAPSE |
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428 | p_qla(:,:) = rhoa * Ls * Cice * z_wnds_t(:,:) & ! Latent Heat |
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429 | & * ( 11637800. * EXP( -5897.8 / pst(:,:) ) / rhoa - sf(jp_humi)%fnow(ji,jj) ) |
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430 | |
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431 | ! Latent heat sensitivity for ice (Dqla/Dt) |
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432 | !CDIR NOVERRCHK |
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433 | !CDIR COLLAPSE |
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434 | p_dqla(:,:) = zcoef_dqla * z_wnds_t(:,:) / ( pst(:,:) * pst(:,:) ) * EXP( -5897.8 / pst(:,:) ) |
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435 | |
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436 | ! Sensible heat sensitivity (Dqsb_ice/Dtn_ice) |
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437 | !CDIR COLLAPSE |
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438 | z_dqsb(:,:) = zcoef_dqsb * z_wnds_t(:,:) |
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439 | |
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440 | ! ----------------------------------------------------------------------------- ! |
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441 | ! III Total FLUXES ! |
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442 | ! ----------------------------------------------------------------------------- ! |
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443 | |
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444 | !CDIR COLLAPSE |
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445 | p_qns (:,:) = z_qlw (:,:) - z_qsb (:,:) - p_qla (:,:) ! Downward Non Solar flux |
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446 | !CDIR COLLAPSE |
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447 | p_dqns(:,:) = - ( z_dqlw(:,:) + z_dqsb(:,:) + p_dqla(:,:) ) ! Total non solar heat flux sensitivity for ice |
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448 | |
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449 | |
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450 | !-------------------------------------------------------------------- |
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451 | ! FRACTIONs of net shortwave radiation which is not absorbed in the |
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452 | ! thin surface layer and penetrates inside the ice cover |
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453 | ! ( Maykut and Untersteiner, 1971 ; Elbert and Curry, 1993 ) |
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454 | |
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455 | !CDIR COLLAPSE |
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456 | p_fr1(:,:) = ( 0.18 * zcoef_fr12 + 0.35 * sf(jp_snow)%fnow(:,:) ) |
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457 | !CDIR COLLAPSE |
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458 | p_fr2(:,:) = ( 0.82 * zcoef_fr12 + 0.65 * sf(jp_snow)%fnow(:,:) ) |
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459 | |
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460 | !CDIR COLLAPSE |
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461 | p_tpr(:,:) = sf(jp_prec)%fnow(:,:) ! total precipitation [kg/m2/s] |
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462 | !CDIR COLLAPSE |
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463 | p_spr(:,:) = sf(jp_snow)%fnow(:,:) ! solid precipitation [kg/m2/s] |
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464 | ! |
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465 | END SUBROUTINE blk_ice_core |
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466 | |
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467 | |
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468 | SUBROUTINE turb_core( zzu, T_0, T_a, q_sat, q_a, dU, C_d, C_h, C_e ) |
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469 | !!--------------------------------------------------------------------- |
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470 | !! Computes turbulent transfert coefficients of surface fluxes |
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471 | !! according to Large & Yeager (2004) |
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472 | !! |
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473 | !! I N E R T I A L D I S S I P A T I O N M E T H O D |
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474 | !! |
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475 | !! Momentum, Latent and sensible heat exchange coefficients |
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476 | !! |
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477 | !! Caution: this procedure should only be used in cases when air temperature (T_air), |
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478 | !! air specific humidity (q_air) and wind (dU) are provided at the same height 'zzu'! |
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479 | !! |
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480 | !! Laurent Brodeau, LEGI, Grenoble |
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481 | !! brodeau@hmg.inpg.fr |
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482 | !!--------------------------------------------------------------------- |
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483 | REAL(wp), INTENT(in ) :: zzu ! altitude of wind measurement [m] |
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484 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_0 ! sea surface temperature [Kelvin] |
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485 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_a ! potential air temperature at zzu [Kelvin] |
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486 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg] |
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487 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_a ! specific air humidity at zzu [kg/kg] |
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488 | REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! wind module |U(zzu)-U(0)| [m/s] |
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489 | REAL(wp), INTENT(inout), DIMENSION(jpi,jpj) :: C_d ! transfer coefficient for momentum (tau) |
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490 | REAL(wp), INTENT(inout), DIMENSION(jpi,jpj) :: C_h ! transfer coefficient for sensible heat (Q_sens) |
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491 | REAL(wp), INTENT(inout), DIMENSION(jpi,jpj) :: C_e ! tansfert coefficient for evaporation (Q_lat) |
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492 | |
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493 | INTEGER :: jk ! dummy loop indices |
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494 | INTEGER , PARAMETER :: nit = 3 ! number of iterations |
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495 | INTEGER , DIMENSION(jpi,jpj) :: stab ! stability test integer |
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496 | INTEGER , DIMENSION(jpi,jpj) :: stabit ! stability within iterative loop |
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497 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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498 | dU10, & ! dU [m/s] |
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499 | dT, & ! air/sea temperature differeence [K] |
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500 | dq, & ! air/sea humidity difference [K] |
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501 | Cd_n10, & ! 10m neutral drag coefficient |
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502 | Ce_n10, & ! 10m neutral latent coefficient |
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503 | Ch_n10, & ! 10m neutral sensible coefficient |
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504 | Cd, & ! drag coefficient |
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505 | Ce, & ! latent coefficient |
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506 | Ch, & ! sensible coefficient |
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507 | sqrt_Cd_n10, & ! root square of Cd_n10 |
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508 | sqrt_Cd, & ! root square of Cd |
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509 | T_vpot, & ! virtual potential temperature [K] |
---|
510 | T_star, & ! turbulent scale of tem. fluct. |
---|
511 | q_star, & ! turbulent humidity of temp. fluct. |
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512 | U_star, & ! turb. scale of velocity fluct. |
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513 | L, & ! Monin-Obukov length [m] |
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514 | zeta, & ! stability parameter at height zzu |
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515 | X2, X, & |
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516 | psi_m, & |
---|
517 | psi_h, & |
---|
518 | U_n10, & ! neutral wind velocity at 10m [m] |
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519 | xlogt |
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520 | !!--------------------------------------------------------------------- |
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521 | |
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522 | !! I. Preliminary stuffs |
---|
523 | !! -------------------- |
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524 | |
---|
525 | ! ... Air/sea differences |
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526 | dU10 = MAX( 0.5, dU ) ! we do not want to fall under 0.5 m/s |
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527 | dT = T_a - T_0 ! assuming that T_a is allready the potential temp. at zzu |
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528 | dq = q_a - q_sat |
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529 | |
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530 | ! ... Virtual potential temperature |
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531 | T_vpot = T_a * ( 1. + 0.608 * q_a ) |
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532 | |
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533 | ! ... Computing Neutral Drag Coefficient |
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534 | !CDIR NOVERRCHK |
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535 | Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! \\ L & Y eq. (6a) |
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536 | sqrt_Cd_n10 = SQRT( Cd_n10 ) |
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537 | |
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538 | Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! \\ L & Y eq. (6b) |
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539 | |
---|
540 | ! ... First guess of stabilitty : |
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541 | stab = 0.5 + SIGN( 0.5, dT ) ! stable : stab = 1 ; unstable : stab = 0 |
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542 | Ch_n10 = 1E-3 * sqrt_Cd_n10 * ( 18*stab + 32.7*(1-stab) ) ! \\ L & Y eq. (6c), (6d) |
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543 | |
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544 | ! ... Initializing transfert coefficients with their first guess neutral equivalents : |
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545 | Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 |
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546 | |
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547 | |
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548 | !! II. Now starting iteration loop (IDM) |
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549 | !! ------------------------------------- |
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550 | |
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551 | DO jk = 1, nit |
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552 | |
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553 | !CDIR NOVERRCHK |
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554 | sqrt_Cd = SQRT( Cd ) |
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555 | |
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556 | !! Turbulent scales : |
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557 | !! ------------------ |
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558 | U_star = sqrt_Cd * dU10 ! \\ L & Y eq. (7a) |
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559 | T_star = Ch/sqrt_Cd * dT ! \\ L & Y eq. (7b) |
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560 | q_star = Ce/sqrt_Cd * dq ! \\ L & Y eq. (7c) |
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561 | |
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562 | !! Estimate the Monin-Obukov length : |
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563 | !! ---------------------------------- |
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564 | L = (U_star*U_star) / ( vkarmn*grav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) ) |
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565 | |
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566 | !! Stability parameters : |
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567 | !! ---------------------- |
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568 | zeta = zzu / L |
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569 | zeta = SIGN( MIN( ABS( zeta ), 10.0 ), zeta ) |
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570 | |
---|
571 | !! Psis, L & Y eq. (8c), (8d), (8e) : |
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572 | !! ---------------------------------- |
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573 | !CDIR NOVERRCHK |
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574 | X2 = SQRT( ABS( 1. - 16.*zeta ) ) ; X2 = MAX( X2 , 1.0 ) |
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575 | !CDIR NOVERRCHK |
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576 | X = SQRT( X2 ) |
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577 | |
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578 | stabit = 0.5 + SIGN( 0.5, zeta ) |
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579 | |
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580 | !CDIR NOVERRCHK |
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581 | psi_m = -5. * zeta * stabit & ! Stable |
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582 | & + (1 - stabit)*(2*LOG((1. + X)/2) + LOG((1. + X2)/2) - 2*atan(X) + rpi/2) ! Unstable |
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583 | |
---|
584 | !CDIR NOVERRCHK |
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585 | psi_h = -5. * zeta * stabit & ! Stable |
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586 | & + (1 - stabit)*(2*LOG( (1. + X2)/2 )) ! Unstable |
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587 | |
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588 | !! Shifting the wind speed to 10m and neutral stability : |
---|
589 | !! ------------------------------------------------------ |
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590 | !CDIR NOVERRCHK |
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591 | U_n10 = dU10 / (1. + SQRT( Cd_n10 ) / vkarmn * ( LOG(zzu/10.) - psi_m ) ) ! \\ L & Y eq. (9a) |
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592 | |
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593 | !! Updating the neutral 10m transfer coefficients : |
---|
594 | !! ------------------------------------------------ |
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595 | Cd_n10 = 1e-3 * ( 2.7/U_n10 + 0.142 + U_n10/13.09 ) ! \\ L & Y eq. (6a) |
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596 | !CDIR NOVERRCHK |
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597 | sqrt_Cd_n10 = SQRT( Cd_n10 ) |
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598 | |
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599 | Ce_n10 = 1e-3 * ( 34.6 * sqrt_Cd_n10 ) ! \\ L & Y eq. (6b) |
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600 | |
---|
601 | stab = 0.5 + sign(0.5,zeta) |
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602 | Ch_n10 = 1e-3 * sqrt_Cd_n10 * ( 18.*stab + 32.7*(1-stab) ) ! \\ L & Y eq. (6c), (6d) |
---|
603 | |
---|
604 | !! Shifting the neutral 10m transfer coefficients to ( zzu , zeta ) : |
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605 | !! -------------------------------------------------------------------- |
---|
606 | !! Problem here, formulation used within L & Y differs from the one provided |
---|
607 | !! in their fortran code (only for Ce and Ch) |
---|
608 | |
---|
609 | !CDIR NOVERRCHK |
---|
610 | Cd = Cd_n10/(1. + sqrt_Cd_n10/vkarmn*(LOG(zzu/10) - psi_m))**2 ! \\ L & Y eq. (10a) |
---|
611 | |
---|
612 | !CDIR NOVERRCHK |
---|
613 | xlogt = LOG(zzu/10) - psi_h |
---|
614 | !CDIR NOVERRCHK |
---|
615 | !? Ch = Ch_n10*SQRT(Cd/Cd_n10)/(1. + Ch_n10/(vkarmn*sqrt_Cd_n10)*xlogt) |
---|
616 | Ch = Ch_n10/( 1. + Ch_n10*xlogt/vkarmn/sqrt_Cd_n10 )**2 ! \\ L & Y eq. (10b) |
---|
617 | |
---|
618 | !CDIR NOVERRCHK |
---|
619 | !? Ce = Ce_n10*SQRT(Cd/Cd_n10)/(1. + Ce_n10/(vkarmn*sqrt_Cd_n10)*xlogt) |
---|
620 | Ce = Ce_n10/( 1. + Ce_n10*xlogt/vkarmn/sqrt_Cd_n10 )**2 ! \\ L & Y eq. (10c) |
---|
621 | |
---|
622 | END DO |
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623 | |
---|
624 | C_d(:,:) = Cd(:,:) |
---|
625 | C_h(:,:) = Ch(:,:) |
---|
626 | C_e(:,:) = Ce(:,:) |
---|
627 | |
---|
628 | END SUBROUTINE TURB_CORE |
---|
629 | |
---|
630 | !!====================================================================== |
---|
631 | END MODULE sbcblk_core |
---|