MODULE subsidence_mod !--------------------------------------------------------------------------------! ! This file is part of PALM. ! ! PALM is free software: you can redistribute it and/or modify it under the terms ! of the GNU General Public License as published by the Free Software Foundation, ! either version 3 of the License, or (at your option) any later version. ! ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. ! ! You should have received a copy of the GNU General Public License along with ! PALM. If not, see . ! ! Copyright 1997-2014 Leibniz Universitaet Hannover !--------------------------------------------------------------------------------! ! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ----------------- ! $Id: subsidence.f90 1354 2014-04-08 15:22:57Z hoffmann $ ! ! 1353 2014-04-08 15:21:23Z heinze ! REAL constants provided with KIND-attribute ! ! 1320 2014-03-20 08:40:49Z raasch ! ONLY-attribute added to USE-statements, ! kind-parameters added to all INTEGER and REAL declaration statements, ! kinds are defined in new module kinds, ! old module precision_kind is removed, ! revision history before 2012 removed, ! comment fields (!:) to be used for variable explanations added to ! all variable declaration statements ! ! 1036 2012-10-22 13:43:42Z raasch ! code put under GPL (PALM 3.9) ! ! Revision 3.7 2009-12-11 14:15:58Z heinze ! Initial revision ! ! Description: ! ------------ ! Impact of large-scale subsidence or ascent as tendency term for use ! in the prognostic equation of potential temperature. This enables the ! construction of a constant boundary layer height z_i with time. !-----------------------------------------------------------------------------! IMPLICIT NONE PRIVATE PUBLIC init_w_subsidence, subsidence INTERFACE init_w_subsidence MODULE PROCEDURE init_w_subsidence END INTERFACE init_w_subsidence INTERFACE subsidence MODULE PROCEDURE subsidence MODULE PROCEDURE subsidence_ij END INTERFACE subsidence CONTAINS SUBROUTINE init_w_subsidence USE arrays_3d, & ONLY: dzu, w_subs, zu USE control_parameters, & ONLY: message_string, ocean, subs_vertical_gradient, & subs_vertical_gradient_level, subs_vertical_gradient_level_i USE indices, & ONLY: nzb, nzt USE kinds IMPLICIT NONE INTEGER(iwp) :: i !: INTEGER(iwp) :: k !: REAL(wp) :: gradient !: REAL(wp) :: ws_surface !: IF ( .NOT. ALLOCATED( w_subs )) THEN ALLOCATE( w_subs(nzb:nzt+1) ) w_subs = 0.0_wp ENDIF IF ( ocean ) THEN message_string = 'Applying large scale vertical motion is not ' // & 'allowed for ocean runs' CALL message( 'init_w_subsidence', 'PA0324', 2, 2, 0, 6, 0 ) ENDIF ! !-- Compute the profile of the subsidence/ascent velocity !-- using the given gradients i = 1 gradient = 0.0_wp ws_surface = 0.0_wp subs_vertical_gradient_level_i(1) = 0 DO k = 1, nzt+1 IF ( i < 11 ) THEN IF ( subs_vertical_gradient_level(i) < zu(k) .AND. & subs_vertical_gradient_level(i) >= 0.0_wp ) THEN gradient = subs_vertical_gradient(i) / 100.0_wp subs_vertical_gradient_level_i(i) = k - 1 i = i + 1 ENDIF ENDIF IF ( gradient /= 0.0_wp ) THEN IF ( k /= 1 ) THEN w_subs(k) = w_subs(k-1) + dzu(k) * gradient ELSE w_subs(k) = ws_surface + 0.5_wp * dzu(k) * gradient ENDIF ELSE w_subs(k) = w_subs(k-1) ENDIF ENDDO ! !-- In case of no given gradients for the subsidence/ascent velocity, !-- choose zero gradient IF ( subs_vertical_gradient_level(1) == -9999999.9_wp ) THEN subs_vertical_gradient_level(1) = 0.0_wp ENDIF END SUBROUTINE init_w_subsidence SUBROUTINE subsidence( tendency, var, var_init ) USE arrays_3d, & ONLY: ddzu, w_subs USE control_parameters, & ONLY: dt_3d USE indices, & ONLY: nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzb_s_inner,& nzt USE kinds IMPLICIT NONE INTEGER(iwp) :: i !: INTEGER(iwp) :: j !: INTEGER(iwp) :: k !: REAL(wp) :: tmp_grad !: REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !: REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !: REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !: REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !: var_mod = var_init ! !-- Influence of w_subsidence on the current tendency term DO i = nxl, nxr DO j = nys, nyn DO k = nzb_s_inner(j,i)+1, nzt IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) ELSE ! large-scale ascent tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) ENDIF ENDDO ENDDO ENDDO ! !-- Shifting of the initial profile is especially necessary with Rayleigh !-- damping switched on DO k = nzb, nzt IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & ( var_init(k+1) - var_init(k) ) * ddzu(k+1) ENDIF ENDDO ! !-- At the upper boundary, the initial profile is shifted with aid of !-- the gradient tmp_grad. (This is ok if the gradients are linear.) IF ( w_subs(nzt) < 0.0_wp ) THEN tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1) var_mod(nzt+1) = var_init(nzt+1) - & dt_3d * w_subs(nzt+1) * tmp_grad ENDIF DO k = nzt+1, nzb+1, -1 IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & ( var_init(k) - var_init(k-1) ) * ddzu(k) ENDIF ENDDO ! !-- At the lower boundary shifting is not necessary because the !-- subsidence velocity w_subs(nzb) vanishes. IF ( w_subs(nzb+1) >= 0.0_wp ) THEN var_mod(nzb) = var_init(nzb) ENDIF var_init = var_mod END SUBROUTINE subsidence SUBROUTINE subsidence_ij( i, j, tendency, var, var_init ) USE arrays_3d, & ONLY: ddzu, w_subs USE control_parameters, & ONLY: dt_3d USE indices, & ONLY: nxl, nxlg, nxrg, nyng, nys, nysg, nzb_s_inner, nzb, nzt USE kinds IMPLICIT NONE INTEGER(iwp) :: i !: INTEGER(iwp) :: j !: INTEGER(iwp) :: k !: REAL(wp) :: tmp_grad !: REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !: REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !: REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !: REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !: var_mod = var_init ! !-- Influence of w_subsidence on the current tendency term DO k = nzb_s_inner(j,i)+1, nzt IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) ELSE ! large-scale ascent tendency(k,j,i) = tendency(k,j,i) - w_subs(k) * & ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) ENDIF ENDDO ! !-- Shifting of the initial profile is especially necessary with Rayleigh !-- damping switched on IF ( i == nxl .AND. j == nys ) THEN ! shifting only once per PE DO k = nzb, nzt IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & ( var_init(k+1) - var_init(k) ) * ddzu(k+1) ENDIF ENDDO ! !-- At the upper boundary, the initial profile is shifted with aid of !-- the gradient tmp_grad. (This is ok if the gradients are linear.) IF ( w_subs(nzt) < 0.0_wp ) THEN tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1) var_mod(nzt+1) = var_init(nzt+1) - & dt_3d * w_subs(nzt+1) * tmp_grad ENDIF DO k = nzt+1, nzb+1, -1 IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & ( var_init(k) - var_init(k-1) ) * ddzu(k) ENDIF ENDDO ! !-- At the lower boundary shifting is not necessary because the !-- subsidence velocity w_subs(nzb) vanishes. IF ( w_subs(nzb+1) >= 0.0_wp ) THEN var_mod(nzb) = var_init(nzb) ENDIF var_init = var_mod ENDIF END SUBROUTINE subsidence_ij END MODULE subsidence_mod