1 | MODULE calc_precipitation_mod |
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2 | |
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3 | !------------------------------------------------------------------------------! |
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4 | ! Actual revisions: |
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5 | ! ----------------- |
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6 | ! Precipitation rate and amount are calculated/stored, |
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7 | ! + module control_parameters |
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8 | ! |
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9 | ! Former revisions: |
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10 | ! ----------------- |
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11 | ! $Id: calc_precipitation.f90 72 2007-03-19 08:20:46Z raasch $ |
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12 | ! |
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13 | ! 19 2007-02-23 04:53:48Z raasch |
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14 | ! Calculation extended for gridpoint nzt |
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15 | ! |
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16 | ! RCS Log replace by Id keyword, revision history cleaned up |
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17 | ! |
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18 | ! Revision 1.5 2004/01/30 10:15:57 raasch |
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19 | ! Scalar lower k index nzb replaced by 2d-array nzb_2d |
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20 | ! |
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21 | ! Revision 1.1 2000/04/13 14:45:22 schroeter |
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22 | ! Initial revision |
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23 | ! |
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24 | ! |
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25 | ! |
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26 | ! Description: |
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27 | ! ------------ |
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28 | ! Calculate the change of total water content due to precipitation |
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29 | ! (simplified Kessler scheme) |
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30 | !------------------------------------------------------------------------------! |
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31 | |
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32 | PRIVATE |
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33 | PUBLIC calc_precipitation |
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34 | |
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35 | INTERFACE calc_precipitation |
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36 | MODULE PROCEDURE calc_precipitation |
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37 | MODULE PROCEDURE calc_precipitation_ij |
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38 | END INTERFACE calc_precipitation |
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39 | |
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40 | CONTAINS |
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41 | |
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42 | |
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43 | !------------------------------------------------------------------------------! |
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44 | ! Call for all grid points |
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45 | !------------------------------------------------------------------------------! |
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46 | SUBROUTINE calc_precipitation |
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47 | |
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48 | USE arrays_3d |
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49 | USE cloud_parameters |
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50 | USE constants |
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51 | USE control_parameters |
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52 | USE indices |
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53 | |
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54 | IMPLICIT NONE |
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55 | |
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56 | INTEGER :: i, j, k |
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57 | REAL :: dqdt_precip |
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58 | |
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59 | |
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60 | precipitation_rate = 0.0 |
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61 | |
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62 | DO i = nxl, nxr |
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63 | DO j = nys, nyn |
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64 | DO k = nzb_2d(j,i)+1, nzt |
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65 | |
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66 | IF ( ql(k,j,i) > ql_crit ) THEN |
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67 | dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit ) |
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68 | ELSE |
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69 | dqdt_precip = 0.0 |
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70 | ENDIF |
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71 | tend(k,j,i) = tend(k,j,i) - dqdt_precip |
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72 | ! |
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73 | !-- Precipitation rate in (kg * 0.001) / m**2 / s (because 1kg |
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74 | !-- gives 1 mm) |
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75 | precipitation_rate(j,i) = precipitation_rate(j,i) + & |
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76 | dqdt_precip * dzw(k) * 0.001 |
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77 | |
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78 | ENDDO |
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79 | ! |
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80 | !-- Sum up the precipitation amount (unit kg * 0.001 / m**2) |
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81 | IF ( intermediate_timestep_count == & |
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82 | intermediate_timestep_count_max .AND. & |
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83 | ( dt_do2d_xy-time_do2d_xy ) < precipitation_amount_interval )& |
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84 | THEN |
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85 | precipitation_amount(j,i) = precipitation_amount(j,i) + & |
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86 | precipitation_rate(j,i) * dt_3d |
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87 | ENDIF |
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88 | ENDDO |
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89 | ENDDO |
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90 | |
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91 | END SUBROUTINE calc_precipitation |
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92 | |
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93 | |
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94 | !------------------------------------------------------------------------------! |
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95 | ! Call for grid point i,j |
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96 | !------------------------------------------------------------------------------! |
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97 | SUBROUTINE calc_precipitation_ij( i, j ) |
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98 | |
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99 | USE arrays_3d |
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100 | USE cloud_parameters |
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101 | USE constants |
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102 | USE control_parameters |
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103 | USE indices |
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104 | |
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105 | IMPLICIT NONE |
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106 | |
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107 | INTEGER :: i, j, k |
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108 | REAL :: dqdt_precip |
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109 | |
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110 | |
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111 | precipitation_rate(j,i) = 0.0 |
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112 | |
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113 | ! |
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114 | !-- Ghostpoints are included (although not needed for tend) to avoid a later |
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115 | !-- exchange of these data for the precipitation amount/rate arrays |
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116 | DO k = nzb_2d(j,i)+1, nzt |
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117 | |
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118 | IF ( ql(k,j,i) > ql_crit ) THEN |
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119 | dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit ) |
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120 | ELSE |
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121 | dqdt_precip = 0.0 |
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122 | ENDIF |
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123 | tend(k,j,i) = tend(k,j,i) - dqdt_precip |
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124 | |
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125 | ! |
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126 | !-- Precipitation rate in (kg * 0.001) / m**2 / s (because 1kg gives 1 mm) |
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127 | ! precipitation_rate(j,i) = precipitation_rate(j,i) + dqdt_precip * & |
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128 | ! dzw(k) * 0.001 |
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129 | precipitation_rate(j,i) = 1.0 |
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130 | |
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131 | ENDDO |
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132 | |
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133 | ! |
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134 | !-- Sum up the precipitation amount (unit kg * 0.001 / m**2) |
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135 | IF ( intermediate_timestep_count == intermediate_timestep_count_max & |
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136 | .AND. ( dt_do2d_xy-time_do2d_xy ) < precipitation_amount_interval )& |
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137 | THEN |
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138 | precipitation_amount(j,i) = precipitation_amount(j,i) + & |
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139 | precipitation_rate(j,i) * dt_3d |
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140 | ENDIF |
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141 | |
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142 | END SUBROUTINE calc_precipitation_ij |
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143 | |
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144 | END MODULE calc_precipitation_mod |
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