MODULE subsidence_mod !-----------------------------------------------------------------------------! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ----------------- ! $Id: subsidence.f90 464 2010-02-03 08:40:19Z maronga $ ! ! 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 USE control_parameters USE grid_variables USE indices USE pegrid USE statistics IMPLICIT NONE INTEGER :: i, k REAL :: gradient, ws_surface IF ( .NOT. ALLOCATED( w_subs )) THEN ALLOCATE( w_subs(nzb:nzt+1) ) w_subs = 0.0 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 ws_surface = 0.0 ws_vertical_gradient_level_ind(1) = 0 DO k = 1, nzt+1 IF ( i < 11 ) THEN IF ( ws_vertical_gradient_level(i) < zu(k) .AND. & ws_vertical_gradient_level(i) >= 0.0 ) THEN gradient = ws_vertical_gradient(i) / 100.0 ws_vertical_gradient_level_ind(i) = k - 1 i = i + 1 ENDIF ENDIF IF ( gradient /= 0.0 ) THEN IF ( k /= 1 ) THEN w_subs(k) = w_subs(k-1) + dzu(k) * gradient ELSE w_subs(k) = ws_surface + 0.5 * 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 ( ws_vertical_gradient_level(1) == -9999999.9 ) THEN ws_vertical_gradient_level(1) = 0.0 ENDIF END SUBROUTINE init_w_subsidence SUBROUTINE subsidence( tendency, var, var_init ) USE arrays_3d USE control_parameters USE grid_variables USE indices USE pegrid USE statistics IMPLICIT NONE INTEGER :: i, j, k REAL :: tmp_grad REAL, DIMENSION(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) :: var, tendency REAL, DIMENSION(nzb:nzt+1) :: var_init, 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 ) 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 ) 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 ) 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 ) THEN ! large-scale ascent var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & ( var_init(k) - var_init(k-1) ) * ddzu(k+1) 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 ) 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 USE control_parameters USE grid_variables USE indices USE pegrid USE statistics IMPLICIT NONE INTEGER :: i, j, k REAL :: tmp_grad REAL, DIMENSION(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) :: var, tendency REAL, DIMENSION(nzb:nzt+1) :: var_init, 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 ) 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 ) 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 ) 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 ) THEN ! large-scale ascent var_mod(k) = var_init(k) - dt_3d * w_subs(k) * & ( var_init(k) - var_init(k-1) ) * ddzu(k+1) 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 ) THEN var_mod(nzb) = var_init(nzb) ENDIF var_init = var_mod ENDIF END SUBROUTINE subsidence_ij END MODULE subsidence_mod