1 | MODULE calc_radiation_mod |
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2 | |
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3 | !--------------------------------------------------------------------------------! |
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4 | ! This file is part of PALM. |
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5 | ! |
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6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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8 | ! either version 3 of the License, or (at your option) any later version. |
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9 | ! |
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10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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13 | ! |
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14 | ! You should have received a copy of the GNU General Public License along with |
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15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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16 | ! |
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17 | ! Copyright 1997-2012 Leibniz University Hannover |
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18 | !--------------------------------------------------------------------------------! |
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19 | ! |
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20 | ! Current revisions: |
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21 | ! ----------------- |
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22 | ! |
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23 | ! |
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24 | ! Former revisions: |
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25 | ! ----------------- |
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26 | ! $Id: calc_radiation.f90 1037 2012-10-22 14:10:22Z raasch $ |
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27 | ! |
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28 | ! 1036 2012-10-22 13:43:42Z raasch |
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29 | ! code put under GPL (PALM 3.9) |
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30 | ! |
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31 | ! RCS Log replace by Id keyword, revision history cleaned up |
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32 | ! |
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33 | ! Revision 1.6 2004/01/30 10:17:03 raasch |
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34 | ! Scalar lower k index nzb replaced by 2d-array nzb_2d |
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35 | ! |
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36 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
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37 | ! Initial revision |
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38 | ! |
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39 | ! |
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40 | ! Description: |
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41 | ! ------------- |
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42 | ! Calculation of the vertical divergences of the long-wave radiation-fluxes |
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43 | ! based on the parameterization of the cloud effective emissivity |
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44 | !------------------------------------------------------------------------------! |
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45 | |
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46 | PRIVATE |
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47 | PUBLIC calc_radiation |
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48 | |
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49 | LOGICAL, SAVE :: first_call = .TRUE. |
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50 | REAL, SAVE :: sigma = 5.67E-08 |
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51 | |
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52 | REAL, DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground, lwp_top, & |
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53 | blackbody_emission |
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54 | |
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55 | INTERFACE calc_radiation |
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56 | MODULE PROCEDURE calc_radiation |
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57 | MODULE PROCEDURE calc_radiation_ij |
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58 | END INTERFACE calc_radiation |
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59 | |
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60 | CONTAINS |
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61 | |
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62 | |
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63 | !------------------------------------------------------------------------------! |
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64 | ! Call for all grid points |
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65 | !------------------------------------------------------------------------------! |
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66 | SUBROUTINE calc_radiation |
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67 | |
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68 | USE arrays_3d |
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69 | USE cloud_parameters |
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70 | USE control_parameters |
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71 | USE indices |
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72 | USE pegrid |
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73 | |
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74 | IMPLICIT NONE |
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75 | |
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76 | INTEGER :: i, j, k, k_help |
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77 | |
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78 | REAL :: df_p, df_m , effective_emission_up_m, effective_emission_up_p, & |
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79 | effective_emission_down_m, effective_emission_down_p, & |
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80 | f_up_m, f_up_p, f_down_m, f_down_p, impinging_flux_at_top, & |
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81 | temperature |
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82 | |
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83 | |
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84 | ! |
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85 | !-- On first call, allocate temporary arrays |
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86 | IF ( first_call ) THEN |
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87 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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88 | lwp_top(nzb:nzt+1) ) |
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89 | first_call = .FALSE. |
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90 | ENDIF |
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91 | |
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92 | |
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93 | DO i = nxl, nxr |
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94 | DO j = nys, nyn |
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95 | ! |
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96 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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97 | !-- at all vertical levels |
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98 | lwp_ground(nzb) = 0.0 |
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99 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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100 | |
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101 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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102 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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103 | |
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104 | DO k = nzb_2d(j,i)+1, nzt |
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105 | |
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106 | k_help = ( nzt+nzb+1 ) - k |
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107 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
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108 | dzw(k) |
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109 | |
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110 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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111 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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112 | |
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113 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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114 | blackbody_emission(k) = sigma * temperature**4.0 |
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115 | |
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116 | ENDDO |
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117 | |
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118 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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119 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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120 | lwp_top(nzb) = lwp_top(nzb+1) |
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121 | |
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122 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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123 | ql(nzt+1,j,i) |
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124 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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125 | |
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126 | ! |
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127 | !-- See Chlond '92, this is just a first guess |
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128 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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129 | |
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130 | DO k = nzb_2d(j,i)+1, nzt |
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131 | ! |
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132 | !-- Save some computational time, but this may cause load |
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133 | !-- imbalances if ql is not distributed uniformly |
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134 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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135 | ! |
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136 | !-- Compute effective emissivities |
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137 | effective_emission_up_p = 1.0 - & |
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138 | EXP( -130.0 * lwp_ground(k+1) ) |
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139 | effective_emission_up_m = 1.0 - & |
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140 | EXP( -130.0 * lwp_ground(k-1) ) |
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141 | effective_emission_down_p = 1.0 - & |
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142 | EXP( -158.0 * lwp_top(k+1) ) |
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143 | effective_emission_down_m = 1.0 - & |
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144 | EXP( -158.0 * lwp_top(k-1) ) |
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145 | |
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146 | ! |
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147 | !-- Compute vertical long wave radiation fluxes |
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148 | f_up_p = blackbody_emission(nzb) + & |
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149 | effective_emission_up_p * & |
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150 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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151 | |
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152 | f_up_m = blackbody_emission(nzb) + & |
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153 | effective_emission_up_m * & |
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154 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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155 | |
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156 | f_down_p = impinging_flux_at_top + & |
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157 | effective_emission_down_p * & |
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158 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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159 | |
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160 | f_down_m = impinging_flux_at_top + & |
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161 | effective_emission_down_m * & |
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162 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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163 | |
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164 | ! |
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165 | !-- Divergence of vertical long wave radiation fluxes |
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166 | df_p = f_up_p - f_down_p |
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167 | df_m = f_up_m - f_down_m |
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168 | |
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169 | ! |
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170 | !-- Compute tendency term |
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171 | tend(k,j,i) = tend(k,j,i) - & |
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172 | ( pt_d_t(k) / ( rho_surface * cp ) * & |
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173 | ( df_p - df_m ) / dzw(k) ) |
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174 | |
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175 | ENDIF |
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176 | |
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177 | ENDDO |
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178 | ENDDO |
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179 | ENDDO |
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180 | |
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181 | END SUBROUTINE calc_radiation |
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182 | |
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183 | |
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184 | !------------------------------------------------------------------------------! |
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185 | ! Call for grid point i,j |
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186 | !------------------------------------------------------------------------------! |
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187 | SUBROUTINE calc_radiation_ij( i, j ) |
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188 | |
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189 | USE arrays_3d |
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190 | USE cloud_parameters |
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191 | USE control_parameters |
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192 | USE indices |
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193 | USE pegrid |
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194 | |
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195 | IMPLICIT NONE |
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196 | |
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197 | INTEGER :: i, j, k, k_help |
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198 | |
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199 | REAL :: df_p, df_m , effective_emission_up_m, effective_emission_up_p, & |
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200 | effective_emission_down_m, effective_emission_down_p, & |
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201 | f_up_m, f_up_p, f_down_m, f_down_p, impinging_flux_at_top, & |
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202 | temperature |
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203 | |
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204 | ! |
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205 | !-- On first call, allocate temporary arrays |
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206 | IF ( first_call ) THEN |
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207 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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208 | lwp_top(nzb:nzt+1) ) |
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209 | first_call = .FALSE. |
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210 | ENDIF |
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211 | |
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212 | ! |
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213 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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214 | !-- at all vertical levels |
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215 | lwp_ground(nzb) = 0.0 |
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216 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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217 | |
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218 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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219 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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220 | |
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221 | DO k = nzb_2d(j,i)+1, nzt |
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222 | k_help = ( nzt+nzb+1 ) - k |
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223 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
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224 | |
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225 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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226 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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227 | |
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228 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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229 | blackbody_emission(k) = sigma * temperature**4.0 |
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230 | |
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231 | ENDDO |
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232 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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233 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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234 | lwp_top(nzb) = lwp_top(nzb+1) |
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235 | |
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236 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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237 | ql(nzt+1,j,i) |
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238 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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239 | |
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240 | ! |
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241 | !-- See Chlond '92, this is just a first guess |
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242 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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243 | |
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244 | DO k = nzb_2d(j,i)+1, nzt |
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245 | ! |
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246 | !-- Store some computational time, |
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247 | !-- this may cause load imbalances if ql is not distributed uniformly |
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248 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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249 | ! |
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250 | !-- Compute effective emissivities |
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251 | effective_emission_up_p = 1.0 - & |
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252 | EXP( -130.0 * lwp_ground(k+1) ) |
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253 | effective_emission_up_m = 1.0 - & |
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254 | EXP( -130.0 * lwp_ground(k-1) ) |
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255 | effective_emission_down_p = 1.0 - & |
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256 | EXP( -158.0 * lwp_top(k+1) ) |
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257 | effective_emission_down_m = 1.0 - & |
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258 | EXP( -158.0 * lwp_top(k-1) ) |
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259 | |
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260 | ! |
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261 | !-- Compute vertical long wave radiation fluxes |
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262 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
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263 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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264 | |
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265 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
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266 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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267 | |
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268 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
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269 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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270 | |
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271 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
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272 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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273 | |
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274 | ! |
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275 | !- Divergence of vertical long wave radiation fluxes |
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276 | df_p = f_up_p - f_down_p |
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277 | df_m = f_up_m - f_down_m |
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278 | |
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279 | ! |
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280 | !-- Compute tendency term |
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281 | tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * & |
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282 | ( df_p - df_m ) / dzw(k) ) |
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283 | |
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284 | ENDIF |
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285 | |
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286 | ENDDO |
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287 | |
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288 | END SUBROUTINE calc_radiation_ij |
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289 | |
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290 | END MODULE calc_radiation_mod |
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