[411] | 1 | MODULE subsidence_mod |
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| 2 | |
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| 3 | !-----------------------------------------------------------------------------! |
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| 4 | ! Current revisions: |
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| 5 | ! ----------------- |
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| 6 | ! |
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| 7 | ! |
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| 8 | ! Former revisions: |
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| 9 | ! ----------------- |
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| 10 | ! $Id: subsidence.f90 464 2010-02-03 08:40:19Z raasch $ |
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| 11 | ! |
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[464] | 12 | ! Revision 3.7 2009-12-11 14:15:58Z heinze |
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| 13 | ! Initial revision |
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[411] | 14 | ! |
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| 15 | ! Description: |
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| 16 | ! ------------ |
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| 17 | ! Impact of large-scale subsidence or ascent as tendency term for use |
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| 18 | ! in the prognostic equation of potential temperature. This enables the |
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| 19 | ! construction of a constant boundary layer height z_i with time. |
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| 20 | !-----------------------------------------------------------------------------! |
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| 21 | |
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| 22 | |
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| 23 | IMPLICIT NONE |
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| 24 | |
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| 25 | PRIVATE |
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| 26 | PUBLIC init_w_subsidence, subsidence |
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| 27 | |
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| 28 | INTERFACE init_w_subsidence |
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| 29 | MODULE PROCEDURE init_w_subsidence |
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| 30 | END INTERFACE init_w_subsidence |
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| 31 | |
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| 32 | INTERFACE subsidence |
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| 33 | MODULE PROCEDURE subsidence |
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| 34 | MODULE PROCEDURE subsidence_ij |
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| 35 | END INTERFACE subsidence |
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| 36 | |
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| 37 | CONTAINS |
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| 38 | |
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| 39 | SUBROUTINE init_w_subsidence |
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| 40 | |
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| 41 | USE arrays_3d |
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| 42 | USE control_parameters |
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| 43 | USE grid_variables |
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| 44 | USE indices |
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| 45 | USE pegrid |
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| 46 | USE statistics |
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| 47 | |
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| 48 | IMPLICIT NONE |
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| 49 | |
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| 50 | INTEGER :: i, k |
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| 51 | REAL :: gradient, ws_surface |
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| 52 | |
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| 53 | IF ( .NOT. ALLOCATED( w_subs )) THEN |
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| 54 | ALLOCATE( w_subs(nzb:nzt+1) ) |
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| 55 | w_subs = 0.0 |
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| 56 | ENDIF |
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| 57 | |
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| 58 | IF ( ocean ) THEN |
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| 59 | message_string = 'Applying large scale vertical motion is not ' // & |
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| 60 | 'allowed for ocean runs' |
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| 61 | CALL message( 'init_w_subsidence', 'PA0324', 2, 2, 0, 6, 0 ) |
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| 62 | ENDIF |
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| 63 | |
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| 64 | ! |
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| 65 | !-- Compute the profile of the subsidence/ascent velocity |
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| 66 | !-- using the given gradients |
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| 67 | i = 1 |
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| 68 | gradient = 0.0 |
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| 69 | ws_surface = 0.0 |
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| 70 | |
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| 71 | |
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| 72 | ws_vertical_gradient_level_ind(1) = 0 |
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| 73 | DO k = 1, nzt+1 |
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| 74 | IF ( i < 11 ) THEN |
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| 75 | IF ( ws_vertical_gradient_level(i) < zu(k) .AND. & |
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| 76 | ws_vertical_gradient_level(i) >= 0.0 ) THEN |
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| 77 | gradient = ws_vertical_gradient(i) / 100.0 |
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| 78 | ws_vertical_gradient_level_ind(i) = k - 1 |
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| 79 | i = i + 1 |
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| 80 | ENDIF |
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| 81 | ENDIF |
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| 82 | IF ( gradient /= 0.0 ) THEN |
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| 83 | IF ( k /= 1 ) THEN |
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| 84 | w_subs(k) = w_subs(k-1) + dzu(k) * gradient |
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| 85 | ELSE |
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| 86 | w_subs(k) = ws_surface + 0.5 * dzu(k) * gradient |
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| 87 | ENDIF |
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| 88 | ELSE |
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| 89 | w_subs(k) = w_subs(k-1) |
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| 90 | ENDIF |
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| 91 | ENDDO |
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| 92 | |
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| 93 | ! |
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| 94 | !-- In case of no given gradients for the subsidence/ascent velocity, |
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| 95 | !-- choose zero gradient |
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| 96 | IF ( ws_vertical_gradient_level(1) == -9999999.9 ) THEN |
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| 97 | ws_vertical_gradient_level(1) = 0.0 |
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| 98 | ENDIF |
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| 99 | |
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| 100 | END SUBROUTINE init_w_subsidence |
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| 101 | |
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| 102 | |
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| 103 | SUBROUTINE subsidence( tendency, var, var_init ) |
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| 104 | |
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| 105 | USE arrays_3d |
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| 106 | USE control_parameters |
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| 107 | USE grid_variables |
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| 108 | USE indices |
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| 109 | USE pegrid |
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| 110 | USE statistics |
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| 111 | |
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| 112 | IMPLICIT NONE |
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| 113 | |
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| 114 | INTEGER :: i, j, k |
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| 115 | |
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| 116 | REAL :: tmp_grad |
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| 117 | |
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| 118 | REAL, DIMENSION(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) :: var, tendency |
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| 119 | REAL, DIMENSION(nzb:nzt+1) :: var_init, var_mod |
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| 120 | |
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[464] | 121 | var_mod = var_init |
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[411] | 122 | |
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| 123 | ! |
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| 124 | !-- Influence of w_subsidence on the current tendency term |
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| 125 | DO i = nxl, nxr |
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| 126 | DO j = nys, nyn |
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| 127 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 128 | IF ( w_subs(k) < 0.0 ) THEN ! large-scale subsidence |
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| 129 | tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & |
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| 130 | ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) |
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| 131 | ELSE ! large-scale ascent |
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| 132 | tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & |
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| 133 | ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) |
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| 134 | ENDIF |
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| 135 | ENDDO |
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| 136 | ENDDO |
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| 137 | ENDDO |
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| 138 | |
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| 139 | ! |
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| 140 | !-- Shifting of the initial profile is especially necessary with Rayleigh |
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| 141 | !-- damping switched on |
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| 142 | |
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| 143 | DO k = nzb, nzt |
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| 144 | IF ( w_subs(k) < 0.0 ) THEN ! large-scale subsidence |
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| 145 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 146 | ( var_init(k+1) - var_init(k) ) * ddzu(k+1) |
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| 147 | ENDIF |
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| 148 | ENDDO |
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| 149 | ! |
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| 150 | !-- At the upper boundary, the initial profile is shifted with aid of |
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| 151 | !-- the gradient tmp_grad. (This is ok if the gradients are linear.) |
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| 152 | IF ( w_subs(nzt) < 0.0 ) THEN |
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| 153 | tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1) |
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| 154 | var_mod(nzt+1) = var_init(nzt+1) - & |
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| 155 | dt_3d * w_subs(nzt+1) * tmp_grad |
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| 156 | ENDIF |
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| 157 | |
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| 158 | |
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| 159 | DO k = nzt+1, nzb+1, -1 |
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| 160 | IF ( w_subs(k) >= 0.0 ) THEN ! large-scale ascent |
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| 161 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 162 | ( var_init(k) - var_init(k-1) ) * ddzu(k+1) |
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| 163 | ENDIF |
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| 164 | ENDDO |
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| 165 | ! |
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| 166 | !-- At the lower boundary shifting is not necessary because the |
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| 167 | !-- subsidence velocity w_subs(nzb) vanishes. |
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| 168 | |
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| 169 | |
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| 170 | IF ( w_subs(nzb+1) >= 0.0 ) THEN |
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| 171 | var_mod(nzb) = var_init(nzb) |
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| 172 | ENDIF |
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| 173 | |
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| 174 | var_init = var_mod |
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| 175 | |
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| 176 | |
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| 177 | END SUBROUTINE subsidence |
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| 178 | |
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| 179 | SUBROUTINE subsidence_ij( i, j, tendency, var, var_init ) |
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| 180 | |
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| 181 | USE arrays_3d |
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| 182 | USE control_parameters |
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| 183 | USE grid_variables |
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| 184 | USE indices |
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| 185 | USE pegrid |
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| 186 | USE statistics |
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| 187 | |
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| 188 | IMPLICIT NONE |
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| 189 | |
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| 190 | INTEGER :: i, j, k |
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| 191 | |
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| 192 | REAL :: tmp_grad |
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| 193 | |
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| 194 | REAL, DIMENSION(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) :: var, tendency |
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| 195 | REAL, DIMENSION(nzb:nzt+1) :: var_init, var_mod |
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| 196 | |
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[464] | 197 | var_mod = var_init |
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[411] | 198 | |
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| 199 | ! |
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| 200 | !-- Influence of w_subsidence on the current tendency term |
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| 201 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 202 | IF ( w_subs(k) < 0.0 ) THEN ! large-scale subsidence |
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| 203 | tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & |
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| 204 | ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) |
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| 205 | ELSE ! large-scale ascent |
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| 206 | tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & |
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| 207 | ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) |
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| 208 | ENDIF |
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| 209 | ENDDO |
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| 210 | |
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| 211 | |
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| 212 | ! |
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| 213 | !-- Shifting of the initial profile is especially necessary with Rayleigh |
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| 214 | !-- damping switched on |
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| 215 | IF ( i == nxl .AND. j == nys ) THEN ! shifting only once per PE |
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| 216 | |
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| 217 | DO k = nzb, nzt |
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| 218 | IF ( w_subs(k) < 0.0 ) THEN ! large-scale subsidence |
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| 219 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 220 | ( var_init(k+1) - var_init(k) ) * ddzu(k+1) |
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| 221 | ENDIF |
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| 222 | ENDDO |
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| 223 | ! |
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| 224 | !-- At the upper boundary, the initial profile is shifted with aid of |
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| 225 | !-- the gradient tmp_grad. (This is ok if the gradients are linear.) |
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| 226 | IF ( w_subs(nzt) < 0.0 ) THEN |
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| 227 | tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1) |
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| 228 | var_mod(nzt+1) = var_init(nzt+1) - & |
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| 229 | dt_3d * w_subs(nzt+1) * tmp_grad |
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| 230 | ENDIF |
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| 231 | |
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| 232 | |
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| 233 | DO k = nzt+1, nzb+1, -1 |
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| 234 | IF ( w_subs(k) >= 0.0 ) THEN ! large-scale ascent |
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| 235 | var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & |
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| 236 | ( var_init(k) - var_init(k-1) ) * ddzu(k+1) |
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| 237 | ENDIF |
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| 238 | ENDDO |
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| 239 | ! |
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| 240 | !-- At the lower boundary shifting is not necessary because the |
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| 241 | !-- subsidence velocity w_subs(nzb) vanishes. |
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| 242 | |
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| 243 | |
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| 244 | IF ( w_subs(nzb+1) >= 0.0 ) THEN |
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| 245 | var_mod(nzb) = var_init(nzb) |
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| 246 | ENDIF |
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| 247 | |
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[464] | 248 | var_init = var_mod |
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[411] | 249 | |
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| 250 | ENDIF |
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| 251 | |
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| 252 | END SUBROUTINE subsidence_ij |
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| 253 | |
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| 254 | |
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| 255 | END MODULE subsidence_mod |
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