| 1 | !> @file subsidence_mod.f90 |
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| 2 | !--------------------------------------------------------------------------------------------------! |
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| 3 | ! This file is part of the PALM model system. |
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| 4 | ! |
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| 5 | ! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General |
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| 6 | ! Public License as published by the Free Software Foundation, either version 3 of the License, or |
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| 7 | ! (at your option) any later version. |
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| 8 | ! |
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| 9 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the |
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| 10 | ! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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| 11 | ! Public License for more details. |
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| 12 | ! |
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| 13 | ! You should have received a copy of the GNU General Public License along with PALM. If not, see |
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| 14 | ! <http://www.gnu.org/licenses/>. |
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| 15 | ! |
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| 16 | ! Copyright 1997-2021 Leibniz Universitaet Hannover |
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| 17 | !--------------------------------------------------------------------------------------------------! |
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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: subsidence_mod.f90 4828 2021-01-05 11:21:41Z banzhafs $ |
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| 27 | ! File re-formatted to follow the PALM coding standard |
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| 28 | ! |
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| 29 | ! |
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| 30 | ! 4360 2020-01-07 11:25:50Z suehring |
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| 31 | ! Introduction of wall_flags_total_0, which currently sets bits based on static topography |
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| 32 | ! information used in wall_flags_static_0 |
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| 33 | ! |
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| 34 | ! 4329 2019-12-10 15:46:36Z motisi |
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| 35 | ! Renamed wall_flags_0 to wall_flags_static_0 |
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| 36 | ! |
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| 37 | ! 4182 2019-08-22 15:20:23Z scharf |
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| 38 | ! Corrected "Former revisions" section |
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| 39 | ! |
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| 40 | ! 3655 2019-01-07 16:51:22Z knoop |
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| 41 | ! Add subroutine and variable description |
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| 42 | ! |
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| 43 | ! Revision 3.7 2009-12-11 14:15:58Z heinze |
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| 44 | ! Initial revision |
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| 45 | ! |
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| 46 | ! Description: |
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| 47 | ! ------------ |
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| 48 | !> Impact of large-scale subsidence or ascent as tendency term for use in the prognostic equation of |
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| 49 | !> potential temperature. This enables the construction of a constant boundary layer height z_i with |
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| 50 | !> time. |
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| 51 | !--------------------------------------------------------------------------------------------------! |
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| 52 | MODULE subsidence_mod |
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| 53 | |
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| 54 | |
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| 55 | IMPLICIT NONE |
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| 56 | |
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| 57 | PRIVATE |
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| 58 | PUBLIC init_w_subsidence, subsidence |
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| 59 | |
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| 60 | INTERFACE init_w_subsidence |
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| 61 | MODULE PROCEDURE init_w_subsidence |
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| 62 | END INTERFACE init_w_subsidence |
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| 63 | |
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| 64 | INTERFACE subsidence |
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| 65 | MODULE PROCEDURE subsidence |
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| 66 | MODULE PROCEDURE subsidence_ij |
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| 67 | END INTERFACE subsidence |
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| 68 | |
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| 69 | CONTAINS |
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| 70 | |
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| 71 | !--------------------------------------------------------------------------------------------------! |
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| 72 | ! Description: |
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| 73 | ! ------------ |
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| 74 | !> Initialize vertical subsidence velocity w_subs. |
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| 75 | !--------------------------------------------------------------------------------------------------! |
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| 76 | SUBROUTINE init_w_subsidence |
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| 77 | |
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| 78 | USE arrays_3d, & |
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| 79 | ONLY: dzu, & |
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| 80 | w_subs, & |
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| 81 | zu |
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| 82 | |
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| 83 | USE control_parameters, & |
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| 84 | ONLY: message_string, & |
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| 85 | ocean_mode, & |
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| 86 | subs_vertical_gradient, & |
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| 87 | subs_vertical_gradient_level, & |
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| 88 | subs_vertical_gradient_level_i |
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| 89 | |
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| 90 | USE indices, & |
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| 91 | ONLY: nzb, & |
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| 92 | nzt |
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| 93 | |
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| 94 | USE kinds |
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| 95 | |
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| 96 | IMPLICIT NONE |
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| 97 | |
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| 98 | INTEGER(iwp) :: i !< loop index |
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| 99 | INTEGER(iwp) :: k !< loop index |
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| 100 | |
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| 101 | REAL(wp) :: gradient !< vertical gradient of subsidence velocity |
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| 102 | REAL(wp) :: ws_surface !< subsidence velocity at the surface |
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| 103 | |
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| 104 | IF ( .NOT. ALLOCATED( w_subs ) ) THEN |
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| 105 | ALLOCATE( w_subs(nzb:nzt+1) ) |
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| 106 | w_subs = 0.0_wp |
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| 107 | ENDIF |
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| 108 | |
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| 109 | IF ( ocean_mode ) THEN |
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| 110 | message_string = 'applying large scale vertical motion is not allowed for ocean mode' |
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| 111 | CALL message( 'init_w_subsidence', 'PA0324', 2, 2, 0, 6, 0 ) |
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| 112 | ENDIF |
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| 113 | |
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| 114 | ! |
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| 115 | !-- Compute the profile of the subsidence/ascent velocity using the given gradients |
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| 116 | i = 1 |
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| 117 | gradient = 0.0_wp |
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| 118 | ws_surface = 0.0_wp |
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| 119 | |
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| 120 | |
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| 121 | subs_vertical_gradient_level_i(1) = 0 |
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| 122 | DO k = 1, nzt+1 |
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| 123 | IF ( i < 11 ) THEN |
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| 124 | IF ( subs_vertical_gradient_level(i) < zu(k) .AND. & |
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| 125 | subs_vertical_gradient_level(i) >= 0.0_wp ) THEN |
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| 126 | gradient = subs_vertical_gradient(i) / 100.0_wp |
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| 127 | subs_vertical_gradient_level_i(i) = k - 1 |
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| 128 | i = i + 1 |
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| 129 | ENDIF |
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| 130 | ENDIF |
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| 131 | IF ( gradient /= 0.0_wp ) THEN |
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| 132 | IF ( k /= 1 ) THEN |
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| 133 | w_subs(k) = w_subs(k-1) + dzu(k) * gradient |
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| 134 | ELSE |
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| 135 | w_subs(k) = ws_surface + 0.5_wp * dzu(k) * gradient |
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| 136 | ENDIF |
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| 137 | ELSE |
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| 138 | w_subs(k) = w_subs(k-1) |
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| 139 | ENDIF |
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| 140 | ENDDO |
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| 141 | |
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| 142 | ! |
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| 143 | !-- In case of no given gradients for the subsidence/ascent velocity, choose zero gradient |
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| 144 | IF ( subs_vertical_gradient_level(1) == -9999999.9_wp ) THEN |
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| 145 | subs_vertical_gradient_level(1) = 0.0_wp |
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| 146 | ENDIF |
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| 147 | |
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| 148 | END SUBROUTINE init_w_subsidence |
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| 149 | |
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| 150 | |
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| 151 | !--------------------------------------------------------------------------------------------------! |
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| 152 | ! Description: |
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| 153 | ! ------------ |
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| 154 | !> Add effect of large-scale subsidence to variable. |
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| 155 | !--------------------------------------------------------------------------------------------------! |
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| 156 | SUBROUTINE subsidence( tendency, var, var_init, ls_index ) |
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| 157 | |
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| 158 | USE arrays_3d, & |
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| 159 | ONLY: ddzu, & |
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| 160 | w_subs |
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| 161 | |
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| 162 | USE control_parameters, & |
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| 163 | ONLY: dt_3d, & |
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| 164 | intermediate_timestep_count, & |
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| 165 | large_scale_forcing, & |
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| 166 | scalar_rayleigh_damping |
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| 167 | |
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| 168 | USE indices, & |
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| 169 | ONLY: nxl, & |
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| 170 | nxlg, & |
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| 171 | nxr, & |
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| 172 | nxrg, & |
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| 173 | nyn, & |
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| 174 | nyng, & |
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| 175 | nys, & |
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| 176 | nysg, & |
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| 177 | nzb, & |
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| 178 | nzt, & |
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| 179 | wall_flags_total_0 |
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| 180 | |
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| 181 | USE kinds |
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| 182 | |
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| 183 | USE statistics, & |
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| 184 | ONLY: sums_ls_l, & |
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| 185 | weight_substep |
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| 186 | |
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| 187 | IMPLICIT NONE |
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| 188 | |
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| 189 | INTEGER(iwp) :: i !< loop index |
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| 190 | INTEGER(iwp) :: j !< loop index |
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| 191 | INTEGER(iwp) :: k !< loop index |
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| 192 | INTEGER(iwp) :: ls_index !< index of large-scale subsidence in sums_ls_l |
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| 193 | |
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| 194 | REAL(wp) :: tmp_tend !< temporary tendency |
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| 195 | REAL(wp) :: tmp_grad !< temporary gradient |
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| 196 | |
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| 197 | REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< variable where to add subsidence |
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| 198 | REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !< tendency of var |
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| 199 | REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !< initialization profile of var |
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| 200 | REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !< modified profile of var |
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| 201 | |
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| 202 | var_mod = var_init |
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| 203 | |
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| 204 | ! |
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| 205 | !-- Influence of w_subsidence on the current tendency term |
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| 206 | DO i = nxl, nxr |
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| 207 | DO j = nys, nyn |
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| 208 | |
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| 209 | DO k = nzb+1, nzt |
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| 210 | IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence |
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| 211 | tmp_tend = - w_subs(k) * ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) * & |
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| 212 | MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) ) |
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| 213 | ELSE ! large-scale ascent |
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| 214 | tmp_tend = - w_subs(k) * ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) * & |
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| 215 | MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) ) |
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| 216 | ENDIF |
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| 217 | |
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| 218 | tendency(k,j,i) = tendency(k,j,i) + tmp_tend |
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| 219 | |
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| 220 | IF ( large_scale_forcing ) THEN |
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| 221 | sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend & |
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| 222 | * weight_substep(intermediate_timestep_count) & |
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| 223 | * MERGE( 1.0_wp, 0.0_wp, & |
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| 224 | BTEST( wall_flags_total_0(k,j,i), 0 ) ) |
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| 225 | ENDIF |
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| 226 | ENDDO |
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| 227 | |
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| 228 | IF ( large_scale_forcing ) THEN |
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| 229 | sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index) |
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| 230 | ENDIF |
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| 231 | |
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| 232 | ENDDO |
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| 233 | ENDDO |
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| 234 | |
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| 235 | ! |
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| 236 | !-- Shifting of the initial profile is especially necessary with Rayleigh damping switched on |
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| 237 | IF ( scalar_rayleigh_damping .AND. intermediate_timestep_count == 1 ) THEN |
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| 238 | DO k = nzb, nzt |
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| 239 | IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence |
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| 240 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 241 | ( var_init(k+1) - var_init(k) ) * ddzu(k+1) |
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| 242 | ENDIF |
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| 243 | ENDDO |
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| 244 | ! |
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| 245 | !-- At the upper boundary, the initial profile is shifted with aid of the gradient tmp_grad. |
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| 246 | !-- (This is ok if the gradients are linear.) |
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| 247 | IF ( w_subs(nzt) < 0.0_wp ) THEN |
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| 248 | tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1) |
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| 249 | var_mod(nzt+1) = var_init(nzt+1) - dt_3d * w_subs(nzt+1) * tmp_grad |
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| 250 | ENDIF |
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| 251 | |
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| 252 | |
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| 253 | DO k = nzt+1, nzb+1, -1 |
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| 254 | IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent |
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| 255 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 256 | ( var_init(k) - var_init(k-1) ) * ddzu(k) |
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| 257 | ENDIF |
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| 258 | ENDDO |
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| 259 | ! |
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| 260 | !-- At the lower boundary shifting is not necessary because the subsidence velocity w_subs(nzb) |
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| 261 | !-- vanishes. |
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| 262 | IF ( w_subs(nzb+1) >= 0.0_wp ) THEN |
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| 263 | var_mod(nzb) = var_init(nzb) |
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| 264 | ENDIF |
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| 265 | |
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| 266 | var_init = var_mod |
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| 267 | ENDIF |
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| 268 | |
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| 269 | |
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| 270 | END SUBROUTINE subsidence |
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| 271 | |
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| 272 | !--------------------------------------------------------------------------------------------------! |
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| 273 | ! Description: |
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| 274 | ! ------------ |
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| 275 | !> Add effect of large-scale subsidence to variable. |
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| 276 | !--------------------------------------------------------------------------------------------------! |
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| 277 | SUBROUTINE subsidence_ij( i, j, tendency, var, var_init, ls_index ) |
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| 278 | |
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| 279 | USE arrays_3d, & |
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| 280 | ONLY: ddzu, & |
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| 281 | w_subs |
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| 282 | |
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| 283 | USE control_parameters, & |
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| 284 | ONLY: dt_3d, & |
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| 285 | intermediate_timestep_count, & |
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| 286 | large_scale_forcing, & |
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| 287 | scalar_rayleigh_damping |
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| 288 | |
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| 289 | USE indices, & |
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| 290 | ONLY: nxl, & |
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| 291 | nxlg, & |
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| 292 | nxrg, & |
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| 293 | nyng, & |
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| 294 | nys, & |
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| 295 | nysg, & |
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| 296 | nzb, & |
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| 297 | nzt, & |
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| 298 | wall_flags_total_0 |
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| 299 | |
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| 300 | USE kinds |
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| 301 | |
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| 302 | USE statistics, & |
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| 303 | ONLY: sums_ls_l, & |
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| 304 | weight_substep |
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| 305 | |
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| 306 | IMPLICIT NONE |
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| 307 | |
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| 308 | INTEGER(iwp) :: i !< loop variable |
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| 309 | INTEGER(iwp) :: j !< loop variable |
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| 310 | INTEGER(iwp) :: k !< loop variable |
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| 311 | INTEGER(iwp) :: ls_index !< index of large-scale subsidence in sums_ls_l |
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| 312 | |
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| 313 | REAL(wp) :: tmp_tend !< temporary tendency |
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| 314 | REAL(wp) :: tmp_grad !< temporary gradient |
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| 315 | |
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| 316 | REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< variable where to add subsidence |
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| 317 | REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !< tendency of var |
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| 318 | REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !< initialization profile of var |
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| 319 | REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !< modified profile of var |
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| 320 | |
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| 321 | var_mod = var_init |
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| 322 | |
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| 323 | ! |
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| 324 | !-- Influence of w_subsidence on the current tendency term |
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| 325 | DO k = nzb+1, nzt |
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| 326 | IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence |
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| 327 | tmp_tend = - w_subs(k) * ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) & |
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| 328 | * MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) ) |
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| 329 | ELSE ! large-scale ascent |
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| 330 | tmp_tend = - w_subs(k) * ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) & |
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| 331 | * MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) ) |
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| 332 | ENDIF |
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| 333 | |
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| 334 | tendency(k,j,i) = tendency(k,j,i) + tmp_tend |
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| 335 | |
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| 336 | IF ( large_scale_forcing ) THEN |
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| 337 | sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend & |
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| 338 | * weight_substep(intermediate_timestep_count) & |
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| 339 | * MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) ) |
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| 340 | ENDIF |
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| 341 | ENDDO |
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| 342 | |
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| 343 | IF ( large_scale_forcing ) THEN |
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| 344 | sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index) |
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| 345 | ENDIF |
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| 346 | |
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| 347 | ! |
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| 348 | !-- Shifting of the initial profile is especially necessary with Rayleigh damping switched on |
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| 349 | IF ( scalar_rayleigh_damping .AND. intermediate_timestep_count == 1 ) THEN |
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| 350 | IF ( i == nxl .AND. j == nys ) THEN ! shifting only once per PE |
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| 351 | |
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| 352 | DO k = nzb, nzt |
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| 353 | IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence |
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| 354 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 355 | ( var_init(k+1) - var_init(k) ) * ddzu(k+1) |
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| 356 | ENDIF |
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| 357 | ENDDO |
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| 358 | ! |
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| 359 | !-- At the upper boundary, the initial profile is shifted with aid of the gradient |
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| 360 | !-- tmp_grad. (This is ok if the gradients are linear.) |
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| 361 | IF ( w_subs(nzt) < 0.0_wp ) THEN |
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| 362 | tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1) |
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| 363 | var_mod(nzt+1) = var_init(nzt+1) - dt_3d * w_subs(nzt+1) * tmp_grad |
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| 364 | ENDIF |
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| 365 | |
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| 366 | |
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| 367 | DO k = nzt+1, nzb+1, -1 |
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| 368 | IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent |
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| 369 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 370 | ( var_init(k) - var_init(k-1) ) * ddzu(k) |
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| 371 | ENDIF |
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| 372 | ENDDO |
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| 373 | ! |
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| 374 | !-- At the lower boundary shifting is not necessary because the subsidence velocity |
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| 375 | !-- w_subs(nzb) vanishes. |
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| 376 | IF ( w_subs(nzb+1) >= 0.0_wp ) THEN |
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| 377 | var_mod(nzb) = var_init(nzb) |
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| 378 | ENDIF |
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| 379 | |
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| 380 | var_init = var_mod |
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| 381 | |
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| 382 | ENDIF |
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| 383 | ENDIF |
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| 384 | |
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| 385 | END SUBROUTINE subsidence_ij |
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| 386 | |
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| 387 | |
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| 388 | END MODULE subsidence_mod |
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