| [1] | 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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| [72] | 6 | ! Precipitation rate and amount are calculated/stored, |
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| 7 | ! + module control_parameters |
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| [1] | 8 | ! |
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| 9 | ! Former revisions: |
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| 10 | ! ----------------- |
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| [3] | 11 | ! $Id: calc_precipitation.f90 73 2007-03-20 08:33:14Z raasch $ |
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| [39] | 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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| [3] | 16 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 17 | ! |
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| [1] | 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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| [72] | 51 | USE control_parameters |
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| [1] | 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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| [72] | 57 | REAL :: dqdt_precip |
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| [1] | 58 | |
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| [72] | 59 | |
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| 60 | precipitation_rate = 0.0 |
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| [1] | 61 | |
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| 62 | DO i = nxl, nxr |
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| 63 | DO j = nys, nyn |
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| [19] | 64 | DO k = nzb_2d(j,i)+1, nzt |
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| [1] | 65 | |
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| 66 | IF ( ql(k,j,i) > ql_crit ) THEN |
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| [72] | 67 | dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit ) |
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| [1] | 68 | ELSE |
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| [72] | 69 | dqdt_precip = 0.0 |
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| [1] | 70 | ENDIF |
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| [72] | 71 | tend(k,j,i) = tend(k,j,i) - dqdt_precip |
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| 72 | ! |
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| [73] | 73 | !-- Precipitation rate in kg / m**2 / s (= mm/s) |
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| [72] | 74 | precipitation_rate(j,i) = precipitation_rate(j,i) + & |
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| [73] | 75 | dqdt_precip * dzw(k) |
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| [1] | 76 | |
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| 77 | ENDDO |
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| [72] | 78 | ! |
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| [73] | 79 | !-- Sum up the precipitation amount, unit kg / m**2 (= mm) |
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| [72] | 80 | IF ( intermediate_timestep_count == & |
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| 81 | intermediate_timestep_count_max .AND. & |
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| 82 | ( dt_do2d_xy-time_do2d_xy ) < precipitation_amount_interval )& |
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| 83 | THEN |
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| 84 | precipitation_amount(j,i) = precipitation_amount(j,i) + & |
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| 85 | precipitation_rate(j,i) * dt_3d |
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| 86 | ENDIF |
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| [1] | 87 | ENDDO |
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| 88 | ENDDO |
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| 89 | |
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| 90 | END SUBROUTINE calc_precipitation |
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| 91 | |
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| 92 | |
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| 93 | !------------------------------------------------------------------------------! |
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| 94 | ! Call for grid point i,j |
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| 95 | !------------------------------------------------------------------------------! |
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| 96 | SUBROUTINE calc_precipitation_ij( i, j ) |
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| 97 | |
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| 98 | USE arrays_3d |
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| 99 | USE cloud_parameters |
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| 100 | USE constants |
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| [72] | 101 | USE control_parameters |
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| [1] | 102 | USE indices |
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| 103 | |
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| 104 | IMPLICIT NONE |
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| 105 | |
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| [72] | 106 | INTEGER :: i, j, k |
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| 107 | REAL :: dqdt_precip |
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| [1] | 108 | |
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| 109 | |
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| [72] | 110 | precipitation_rate(j,i) = 0.0 |
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| 111 | |
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| 112 | ! |
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| 113 | !-- Ghostpoints are included (although not needed for tend) to avoid a later |
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| 114 | !-- exchange of these data for the precipitation amount/rate arrays |
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| [19] | 115 | DO k = nzb_2d(j,i)+1, nzt |
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| [1] | 116 | |
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| 117 | IF ( ql(k,j,i) > ql_crit ) THEN |
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| [72] | 118 | dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit ) |
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| [1] | 119 | ELSE |
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| [72] | 120 | dqdt_precip = 0.0 |
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| [1] | 121 | ENDIF |
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| [72] | 122 | tend(k,j,i) = tend(k,j,i) - dqdt_precip |
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| [1] | 123 | |
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| [72] | 124 | ! |
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| 125 | !-- Precipitation rate in (kg * 0.001) / m**2 / s (because 1kg gives 1 mm) |
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| 126 | ! precipitation_rate(j,i) = precipitation_rate(j,i) + dqdt_precip * & |
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| 127 | ! dzw(k) * 0.001 |
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| 128 | precipitation_rate(j,i) = 1.0 |
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| 129 | |
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| [1] | 130 | ENDDO |
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| 131 | |
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| [72] | 132 | ! |
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| 133 | !-- Sum up the precipitation amount (unit kg * 0.001 / m**2) |
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| 134 | IF ( intermediate_timestep_count == intermediate_timestep_count_max & |
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| 135 | .AND. ( dt_do2d_xy-time_do2d_xy ) < precipitation_amount_interval )& |
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| 136 | THEN |
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| 137 | precipitation_amount(j,i) = precipitation_amount(j,i) + & |
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| 138 | precipitation_rate(j,i) * dt_3d |
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| 139 | ENDIF |
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| 140 | |
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| [1] | 141 | END SUBROUTINE calc_precipitation_ij |
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| 142 | |
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| 143 | END MODULE calc_precipitation_mod |
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