| 1 | MODULE calc_precipitation_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 1997-2014 Leibniz Universitaet 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_precipitation.f90 1321 2014-03-20 09:40:40Z raasch $ |
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| 27 | ! |
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| 28 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 29 | ! ONLY-attribute added to USE-statements, |
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| 30 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 31 | ! kinds are defined in new module kinds, |
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| 32 | ! revision history before 2012 removed, |
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| 33 | ! comment fields (!:) to be used for variable explanations added to |
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| 34 | ! all variable declaration statements |
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| 35 | ! |
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| 36 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 37 | ! code put under GPL (PALM 3.9) |
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| 38 | ! |
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| 39 | ! Revision 1.1 2000/04/13 14:45:22 schroeter |
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| 40 | ! Initial revision |
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| 41 | ! |
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| 42 | ! |
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| 43 | ! |
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| 44 | ! Description: |
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| 45 | ! ------------ |
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| 46 | ! Calculate the change of total water content due to precipitation |
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| 47 | ! (simplified Kessler scheme) |
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| 48 | !------------------------------------------------------------------------------! |
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| 49 | |
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| 50 | PRIVATE |
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| 51 | PUBLIC calc_precipitation |
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| 52 | |
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| 53 | INTERFACE calc_precipitation |
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| 54 | MODULE PROCEDURE calc_precipitation |
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| 55 | MODULE PROCEDURE calc_precipitation_ij |
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| 56 | END INTERFACE calc_precipitation |
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| 57 | |
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| 58 | CONTAINS |
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| 59 | |
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| 60 | |
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| 61 | !------------------------------------------------------------------------------! |
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| 62 | ! Call for all grid points |
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| 63 | !------------------------------------------------------------------------------! |
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| 64 | SUBROUTINE calc_precipitation |
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| 65 | |
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| 66 | USE arrays_3d, & |
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| 67 | ONLY: dzw, ql, tend |
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| 68 | |
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| 69 | USE cloud_parameters, & |
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| 70 | ONLY: precipitation_amount, precipitation_rate, prec_time_const, & |
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| 71 | ql_crit |
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| 72 | |
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| 73 | USE control_parameters, & |
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| 74 | ONLY: dt_do2d_xy, dt_3d, & |
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| 75 | intermediate_timestep_count, intermediate_timestep_count_max,& |
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| 76 | precipitation_amount_interval, time_do2d_xy |
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| 77 | |
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| 78 | USE indices, & |
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| 79 | ONLY: nxl, nxr, nyn, nys, nzb_2d, nzt |
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| 80 | |
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| 81 | USE kinds |
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| 82 | |
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| 83 | |
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| 84 | IMPLICIT NONE |
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| 85 | |
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| 86 | INTEGER(iwp) :: i !: |
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| 87 | INTEGER(iwp) :: j !: |
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| 88 | INTEGER(iwp) :: k !: |
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| 89 | |
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| 90 | REAL(wp) :: dqdt_precip !: |
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| 91 | |
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| 92 | precipitation_rate = 0.0 |
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| 93 | |
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| 94 | DO i = nxl, nxr |
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| 95 | DO j = nys, nyn |
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| 96 | DO k = nzb_2d(j,i)+1, nzt |
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| 97 | |
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| 98 | IF ( ql(k,j,i) > ql_crit ) THEN |
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| 99 | dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit ) |
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| 100 | ELSE |
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| 101 | dqdt_precip = 0.0 |
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| 102 | ENDIF |
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| 103 | tend(k,j,i) = tend(k,j,i) - dqdt_precip |
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| 104 | ! |
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| 105 | !-- Precipitation rate in kg / m**2 / s (= mm/s) |
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| 106 | precipitation_rate(j,i) = precipitation_rate(j,i) + & |
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| 107 | dqdt_precip * dzw(k) |
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| 108 | |
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| 109 | ENDDO |
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| 110 | ! |
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| 111 | !-- Sum up the precipitation amount, unit kg / m**2 (= mm) |
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| 112 | IF ( intermediate_timestep_count == & |
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| 113 | intermediate_timestep_count_max .AND. & |
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| 114 | ( dt_do2d_xy-time_do2d_xy ) < precipitation_amount_interval )& |
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| 115 | THEN |
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| 116 | precipitation_amount(j,i) = precipitation_amount(j,i) + & |
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| 117 | precipitation_rate(j,i) * dt_3d |
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| 118 | ENDIF |
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| 119 | ENDDO |
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| 120 | ENDDO |
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| 121 | |
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| 122 | END SUBROUTINE calc_precipitation |
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| 123 | |
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| 124 | |
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| 125 | !------------------------------------------------------------------------------! |
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| 126 | ! Call for grid point i,j |
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| 127 | !------------------------------------------------------------------------------! |
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| 128 | SUBROUTINE calc_precipitation_ij( i, j ) |
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| 129 | |
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| 130 | USE arrays_3d, & |
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| 131 | ONLY: dzw, ql, tend |
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| 132 | |
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| 133 | USE cloud_parameters, & |
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| 134 | ONLY: precipitation_amount, precipitation_rate, prec_time_const, & |
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| 135 | ql_crit |
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| 136 | |
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| 137 | USE control_parameters, & |
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| 138 | ONLY: dt_do2d_xy, dt_3d, & |
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| 139 | intermediate_timestep_count, intermediate_timestep_count_max,& |
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| 140 | precipitation_amount_interval, time_do2d_xy |
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| 141 | |
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| 142 | USE indices, & |
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| 143 | ONLY: nzb_2d, nzt |
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| 144 | |
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| 145 | USE kinds |
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| 146 | |
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| 147 | |
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| 148 | IMPLICIT NONE |
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| 149 | |
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| 150 | INTEGER(iwp) :: i !: |
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| 151 | INTEGER(iwp) :: j !: |
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| 152 | INTEGER(iwp) :: k !: |
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| 153 | |
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| 154 | REAL(wp) :: dqdt_precip !: |
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| 155 | |
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| 156 | precipitation_rate(j,i) = 0.0 |
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| 157 | |
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| 158 | ! |
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| 159 | !-- Ghostpoints are included (although not needed for tend) to avoid a later |
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| 160 | !-- exchange of these data for the precipitation amount/rate arrays |
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| 161 | DO k = nzb_2d(j,i)+1, nzt |
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| 162 | |
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| 163 | IF ( ql(k,j,i) > ql_crit ) THEN |
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| 164 | dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit ) |
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| 165 | ELSE |
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| 166 | dqdt_precip = 0.0 |
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| 167 | ENDIF |
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| 168 | tend(k,j,i) = tend(k,j,i) - dqdt_precip |
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| 169 | |
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| 170 | ! |
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| 171 | !-- Precipitation rate in kg / m**2 / s (= mm/s) |
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| 172 | precipitation_rate(j,i) = precipitation_rate(j,i) + dqdt_precip * & |
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| 173 | dzw(k) |
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| 174 | |
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| 175 | ENDDO |
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| 176 | |
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| 177 | ! |
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| 178 | !-- Sum up the precipitation amount , unit kg / m**2 (= mm) |
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| 179 | IF ( intermediate_timestep_count == intermediate_timestep_count_max & |
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| 180 | .AND. ( dt_do2d_xy-time_do2d_xy ) < precipitation_amount_interval )& |
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| 181 | THEN |
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| 182 | precipitation_amount(j,i) = precipitation_amount(j,i) + & |
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| 183 | precipitation_rate(j,i) * dt_3d |
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| 184 | ENDIF |
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| 185 | |
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| 186 | END SUBROUTINE calc_precipitation_ij |
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| 187 | |
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| 188 | END MODULE calc_precipitation_mod |
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