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source: palm/trunk/SOURCE/prandtl_fluxes.f90 @ 1673

Last change on this file since 1673 was 1552, checked in by maronga, 10 years ago
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[1]	1	SUBROUTINE prandtl_fluxes
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later version.
	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[484]	20	! Current revisions:
[1]	21	! -----------------
[1552]	22	!
	23	!
	24	! Former revisions:
	25	! -----------------
	26	! $Id: prandtl_fluxes.f90 1552 2015-03-03 14:27:15Z raasch $
	27	!
	28	! 1551 2015-03-03 14:18:16Z maronga
[1551]	29	! Removed land surface model part. The surface fluxes are now always calculated
	30	! within prandtl_fluxes, based on the given surface temperature/humidity (which
	31	! is either provided by the land surface model, by large scale forcing data, or
	32	! directly prescribed by the user.
[1341]	33	!
[1497]	34	! 1496 2014-12-02 17:25:50Z maronga
	35	! Adapted for land surface model
	36	!
[1495]	37	! 1494 2014-11-21 17:14:03Z maronga
	38	! Bugfixes: qs is now calculated before calculation of Rif. Ccalculation of
	39	! buoyancy flux in Rif corrected (added missing humidity term), allow use of
	40	! topography for coupled runs (not tested)
	41	!
[1362]	42	! 1361 2014-04-16 15:17:48Z hoffmann
	43	! Bugfix: calculation of turbulent fluxes of rain water content (qrsws) and rain
	44	! drop concentration (nrsws) added
	45	!
[1341]	46	! 1340 2014-03-25 19:45:13Z kanani
	47	! REAL constants defined as wp-kind
	48	!
[1321]	49	! 1320 2014-03-20 08:40:49Z raasch
[1320]	50	! ONLY-attribute added to USE-statements,
	51	! kind-parameters added to all INTEGER and REAL declaration statements,
	52	! kinds are defined in new module kinds,
	53	! old module precision_kind is removed,
	54	! revision history before 2012 removed,
	55	! comment fields (!:) to be used for variable explanations added to
	56	! all variable declaration statements
[1]	57	!
[1277]	58	! 1276 2014-01-15 13:40:41Z heinze
	59	! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
	60	!
[1258]	61	! 1257 2013-11-08 15:18:40Z raasch
	62	! openACC "kernels do" replaced by "kernels loop", "loop independent" added
	63	!
[1037]	64	! 1036 2012-10-22 13:43:42Z raasch
	65	! code put under GPL (PALM 3.9)
	66	!
[1017]	67	! 1015 2012-09-27 09:23:24Z raasch
	68	! OpenACC statements added
	69	!
[979]	70	! 978 2012-08-09 08:28:32Z fricke
	71	! roughness length for scalar quantities z0h added
	72	!
[1]	73	! Revision 1.1 1998/01/23 10:06:06 raasch
	74	! Initial revision
	75	!
	76	!
	77	! Description:
	78	! ------------
	79	! Diagnostic computation of vertical fluxes in the Prandtl layer from the
	80	! values of the variables at grid point k=1
	81	!------------------------------------------------------------------------------!
	82
[1320]	83	USE arrays_3d, &
[1361]	84	ONLY: e, nr, nrs, nrsws, pt, q, qr, qrs, qrsws, qs, qsws, rif, shf, &
	85	ts, u, us, usws, v, vpt, vsws, zu, zw, z0, z0h
[1]	86
[1320]	87	USE control_parameters, &
[1361]	88	ONLY: cloud_physics, constant_heatflux, constant_waterflux, &
	89	coupling_mode, g, humidity, ibc_e_b, icloud_scheme, kappa, &
	90	large_scale_forcing, lsf_surf, passive_scalar, precipitation, &
	91	pt_surface, q_surface, rif_max, rif_min, run_coupled, &
	92	surface_pressure
[1320]	93
	94	USE indices, &
	95	ONLY: nxl, nxlg, nxr, nxrg, nys, nysg, nyn, nyng, nzb_s_inner, &
	96	nzb_u_inner, nzb_v_inner
	97
	98	USE kinds
	99
[1]	100	IMPLICIT NONE
	101
[1320]	102	INTEGER(iwp) :: i !:
	103	INTEGER(iwp) :: j !:
	104	INTEGER(iwp) :: k !:
[1]	105
[1320]	106	LOGICAL :: coupled_run !:
	107
	108	REAL(wp) :: a !:
	109	REAL(wp) :: b !:
	110	REAL(wp) :: e_q !:
	111	REAL(wp) :: rifm !:
	112	REAL(wp) :: uv_total !:
	113	REAL(wp) :: z_p !:
	114
[1015]	115	!
	116	!-- Data information for accelerators
[1361]	117	!$acc data present( e, nrsws, nzb_u_inner, nzb_v_inner, nzb_s_inner, pt ) &
	118	!$acc present( q, qs, qsws, qrsws, rif, shf, ts, u, us, usws, v ) &
	119	!$acc present( vpt, vsws, zu, zw, z0, z0h )
[667]	120	!
[1]	121	!-- Compute theta*
	122	IF ( constant_heatflux ) THEN
[1496]	123
[1]	124	!
	125	!-- For a given heat flux in the Prandtl layer:
	126	!-- for u* use the value from the previous time step
	127	!$OMP PARALLEL DO
[1257]	128	!$acc kernels loop
[667]	129	DO i = nxlg, nxrg
	130	DO j = nysg, nyng
[1340]	131	ts(j,i) = -shf(j,i) / ( us(j,i) + 1E-30_wp )
[1]	132	!
	133	!-- ts must be limited, because otherwise overflow may occur in case of
	134	!-- us=0 when computing rif further below
[1340]	135	IF ( ts(j,i) < -1.05E5_wp ) ts(j,i) = -1.0E5_wp
	136	IF ( ts(j,i) > 1.0E5_wp ) ts(j,i) = 1.0E5_wp
[1]	137	ENDDO
	138	ENDDO
	139
	140	ELSE
	141	!
	142	!-- For a given surface temperature:
[1496]	143	!-- (the Richardson number is still the one from the previous time step)
[1276]	144	IF ( large_scale_forcing .AND. lsf_surf ) THEN
[1496]	145	!$OMP PARALLEL DO
	146	!$acc kernels loop
	147	DO i = nxlg, nxrg
	148	DO j = nysg, nyng
	149	k = nzb_s_inner(j,i)
	150	pt(k,j,i) = pt_surface
	151	ENDDO
	152	ENDDO
[1276]	153	ENDIF
	154
[1]	155	!$OMP PARALLEL DO PRIVATE( a, b, k, z_p )
[1257]	156	!$acc kernels loop
[667]	157	DO i = nxlg, nxrg
	158	DO j = nysg, nyng
[1]	159
	160	k = nzb_s_inner(j,i)
	161	z_p = zu(k+1) - zw(k)
	162
[1340]	163	IF ( rif(j,i) >= 0.0_wp ) THEN
[1]	164	!
	165	!-- Stable stratification
[978]	166	ts(j,i) = kappa * ( pt(k+1,j,i) - pt(k,j,i) ) / ( &
	167	LOG( z_p / z0h(j,i) ) + &
[1340]	168	5.0_wp * rif(j,i) * ( z_p - z0h(j,i) ) / z_p &
[1]	169	)
	170	ELSE
	171	!
	172	!-- Unstable stratification
[1340]	173	a = SQRT( 1.0_wp - 16.0_wp * rif(j,i) )
	174	b = SQRT( 1.0_wp - 16.0_wp * rif(j,i) * z0h(j,i) / z_p )
[187]	175
[1494]	176	ts(j,i) = kappa * ( pt(k+1,j,i) - pt(k,j,i) ) / ( &
	177	LOG( z_p / z0h(j,i) ) - &
[1340]	178	2.0_wp * LOG( ( 1.0_wp + a ) / ( 1.0_wp + b ) ) )
[1]	179	ENDIF
	180
	181	ENDDO
	182	ENDDO
	183	ENDIF
	184
	185	!
[1494]	186	!-- If required compute q*
	187	IF ( humidity .OR. passive_scalar ) THEN
	188	IF ( constant_waterflux ) THEN
	189	!
	190	!-- For a given water flux in the Prandtl layer:
	191	!$OMP PARALLEL DO
	192	!$acc kernels loop
	193	DO i = nxlg, nxrg
	194	DO j = nysg, nyng
	195	qs(j,i) = -qsws(j,i) / ( us(j,i) + 1E-30_wp )
	196	ENDDO
	197	ENDDO
	198
	199	ELSE
	200	coupled_run = ( coupling_mode == 'atmosphere_to_ocean' .AND. run_coupled )
	201
	202	IF ( large_scale_forcing .AND. lsf_surf ) THEN
[1496]	203	!$OMP PARALLEL DO
	204	!$acc kernels loop
	205	DO i = nxlg, nxrg
	206	DO j = nysg, nyng
	207	k = nzb_s_inner(j,i)
	208	q(k,j,i) = q_surface
	209	ENDDO
	210	ENDDO
[1494]	211	ENDIF
	212
	213	!$OMP PARALLEL DO PRIVATE( a, b, k, z_p )
	214	!$acc kernels loop independent
	215	DO i = nxlg, nxrg
	216	!$acc loop independent
	217	DO j = nysg, nyng
	218
	219	k = nzb_s_inner(j,i)
	220	z_p = zu(k+1) - zw(k)
	221
	222	!
	223	!-- Assume saturation for atmosphere coupled to ocean (but not
	224	!-- in case of precursor runs)
	225	IF ( coupled_run ) THEN
	226	e_q = 6.1_wp * &
	227	EXP( 0.07_wp * ( MIN(pt(k,j,i),pt(k+1,j,i)) - 273.15_wp ) )
	228	q(k,j,i) = 0.622_wp * e_q / ( surface_pressure - e_q )
	229	ENDIF
	230	IF ( rif(j,i) >= 0.0_wp ) THEN
	231	!
	232	!-- Stable stratification
	233	qs(j,i) = kappa * ( q(k+1,j,i) - q(k,j,i) ) / ( &
	234	LOG( z_p / z0h(j,i) ) + &
	235	5.0_wp * rif(j,i) * ( z_p - z0h(j,i) ) / z_p &
	236	)
	237	ELSE
	238	!
	239	!-- Unstable stratification
	240	a = SQRT( 1.0_wp - 16.0_wp * rif(j,i) )
	241	b = SQRT( 1.0_wp - 16.0_wp * rif(j,i) * z0h(j,i) / z_p )
	242
	243	qs(j,i) = kappa * ( q(k+1,j,i) - q(k,j,i) ) / ( &
	244	LOG( z_p / z0h(j,i) ) - &
	245	2.0_wp * LOG( (1.0_wp + a ) / ( 1.0_wp + b ) ) )
	246	ENDIF
	247
	248	ENDDO
	249	ENDDO
	250	ENDIF
	251	ENDIF
	252
	253	!
[1]	254	!-- Compute z_p/L (corresponds to the Richardson-flux number)
[75]	255	IF ( .NOT. humidity ) THEN
[1]	256	!$OMP PARALLEL DO PRIVATE( k, z_p )
[1257]	257	!$acc kernels loop
[667]	258	DO i = nxlg, nxrg
	259	DO j = nysg, nyng
[1]	260	k = nzb_s_inner(j,i)
	261	z_p = zu(k+1) - zw(k)
	262	rif(j,i) = z_p * kappa * g * ts(j,i) / &
[1340]	263	( pt(k+1,j,i) * ( us(j,i)**2 + 1E-30_wp ) )
[1]	264	!
	265	!-- Limit the value range of the Richardson numbers.
	266	!-- This is necessary for very small velocities (u,v --> 0), because
	267	!-- the absolute value of rif can then become very large, which in
	268	!-- consequence would result in very large shear stresses and very
	269	!-- small momentum fluxes (both are generally unrealistic).
	270	IF ( rif(j,i) < rif_min ) rif(j,i) = rif_min
	271	IF ( rif(j,i) > rif_max ) rif(j,i) = rif_max
	272	ENDDO
	273	ENDDO
	274	ELSE
	275	!$OMP PARALLEL DO PRIVATE( k, z_p )
[1257]	276	!$acc kernels loop
[667]	277	DO i = nxlg, nxrg
	278	DO j = nysg, nyng
[1]	279	k = nzb_s_inner(j,i)
	280	z_p = zu(k+1) - zw(k)
[1494]	281	rif(j,i) = z_p * kappa * g * &
	282	( ts(j,i) + 0.61_wp * pt(k+1,j,i) * qs(j,i) + 0.61_wp &
	283	* q(k+1,j,i) * ts(j,i)) / &
[1340]	284	( vpt(k+1,j,i) * ( us(j,i)**2 + 1E-30_wp ) )
[1]	285	!
	286	!-- Limit the value range of the Richardson numbers.
	287	!-- This is necessary for very small velocities (u,v --> 0), because
	288	!-- the absolute value of rif can then become very large, which in
	289	!-- consequence would result in very large shear stresses and very
	290	!-- small momentum fluxes (both are generally unrealistic).
	291	IF ( rif(j,i) < rif_min ) rif(j,i) = rif_min
	292	IF ( rif(j,i) > rif_max ) rif(j,i) = rif_max
	293	ENDDO
	294	ENDDO
	295	ENDIF
	296
	297	!
	298	!-- Compute u* at the scalars' grid points
	299	!$OMP PARALLEL DO PRIVATE( a, b, k, uv_total, z_p )
[1257]	300	!$acc kernels loop
[1]	301	DO i = nxl, nxr
	302	DO j = nys, nyn
	303
	304	k = nzb_s_inner(j,i)
	305	z_p = zu(k+1) - zw(k)
	306
	307	!
[667]	308	!-- Compute the absolute value of the horizontal velocity
	309	!-- (relative to the surface)
[1494]	310	uv_total = SQRT( ( 0.5_wp * ( u(k+1,j,i) + u(k+1,j,i+1) &
	311	- u(k,j,i) - u(k,j,i+1) ) )**2 + &
	312	( 0.5_wp * ( v(k+1,j,i) + v(k+1,j+1,i) &
[1340]	313	- v(k,j,i) - v(k,j+1,i) ) )**2 )
[1]	314
[667]	315
[1340]	316	IF ( rif(j,i) >= 0.0_wp ) THEN
[1]	317	!
	318	!-- Stable stratification
[1494]	319	us(j,i) = kappa * uv_total / ( &
	320	LOG( z_p / z0(j,i) ) + &
	321	5.0_wp * rif(j,i) * ( z_p - z0(j,i) ) / z_p &
[1]	322	)
	323	ELSE
	324	!
	325	!-- Unstable stratification
[1340]	326	a = SQRT( SQRT( 1.0_wp - 16.0_wp * rif(j,i) ) )
	327	b = SQRT( SQRT( 1.0_wp - 16.0_wp * rif(j,i) / z_p * z0(j,i) ) )
[187]	328
[1494]	329	us(j,i) = kappa * uv_total / ( &
	330	LOG( z_p / z0(j,i) ) - &
	331	LOG( ( 1.0_wp + a )*2 ( 1.0_wp + a**2 ) / ( &
	332	( 1.0_wp + b )*2 ( 1.0_wp + b**2 ) ) ) + &
	333	2.0_wp * ( ATAN( a ) - ATAN( b ) ) &
[187]	334	)
[1]	335	ENDIF
	336	ENDDO
	337	ENDDO
	338
	339	!
[187]	340	!-- Values of us at ghost point locations are needed for the evaluation of usws
	341	!-- and vsws.
[1015]	342	!$acc update host( us )
[187]	343	CALL exchange_horiz_2d( us )
[1015]	344	!$acc update device( us )
	345
[187]	346	!
[1]	347	!-- Compute u'w' for the total model domain.
	348	!-- First compute the corresponding component of u* and square it.
	349	!$OMP PARALLEL DO PRIVATE( a, b, k, rifm, z_p )
[1257]	350	!$acc kernels loop
[1]	351	DO i = nxl, nxr
	352	DO j = nys, nyn
	353
	354	k = nzb_u_inner(j,i)
	355	z_p = zu(k+1) - zw(k)
	356
	357	!
	358	!-- Compute Richardson-flux number for this point
[1340]	359	rifm = 0.5_wp * ( rif(j,i-1) + rif(j,i) )
	360	IF ( rifm >= 0.0_wp ) THEN
[1]	361	!
	362	!-- Stable stratification
[1494]	363	usws(j,i) = kappa * ( u(k+1,j,i) - u(k,j,i) )/ ( &
	364	LOG( z_p / z0(j,i) ) + &
	365	5.0_wp * rifm * ( z_p - z0(j,i) ) / z_p &
[1340]	366	)
[1]	367	ELSE
	368	!
	369	!-- Unstable stratification
[1340]	370	a = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm ) )
	371	b = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm / z_p * z0(j,i) ) )
[187]	372
[1494]	373	usws(j,i) = kappa * ( u(k+1,j,i) - u(k,j,i) ) / ( &
	374	LOG( z_p / z0(j,i) ) - &
	375	LOG( (1.0_wp + a )*2 ( 1.0_wp + a**2 ) / ( &
	376	(1.0_wp + b )*2 ( 1.0_wp + b**2 ) ) ) + &
	377	2.0_wp * ( ATAN( a ) - ATAN( b ) ) &
[1]	378	)
	379	ENDIF
[1340]	380	usws(j,i) = -usws(j,i) * 0.5_wp * ( us(j,i-1) + us(j,i) )
[1]	381	ENDDO
	382	ENDDO
	383
	384	!
	385	!-- Compute v'w' for the total model domain.
	386	!-- First compute the corresponding component of u* and square it.
	387	!$OMP PARALLEL DO PRIVATE( a, b, k, rifm, z_p )
[1257]	388	!$acc kernels loop
[1]	389	DO i = nxl, nxr
	390	DO j = nys, nyn
	391
	392	k = nzb_v_inner(j,i)
	393	z_p = zu(k+1) - zw(k)
	394
	395	!
	396	!-- Compute Richardson-flux number for this point
[1340]	397	rifm = 0.5_wp * ( rif(j-1,i) + rif(j,i) )
	398	IF ( rifm >= 0.0_wp ) THEN
[1]	399	!
	400	!-- Stable stratification
[1494]	401	vsws(j,i) = kappa * ( v(k+1,j,i) - v(k,j,i) ) / ( &
	402	LOG( z_p / z0(j,i) ) + &
	403	5.0_wp * rifm * ( z_p - z0(j,i) ) / z_p &
[1340]	404	)
[1]	405	ELSE
	406	!
	407	!-- Unstable stratification
[1340]	408	a = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm ) )
	409	b = SQRT( SQRT( 1.0_wp - 16.0_wp * rifm / z_p * z0(j,i) ) )
[187]	410
[1494]	411	vsws(j,i) = kappa * ( v(k+1,j,i) - v(k,j,i) ) / ( &
	412	LOG( z_p / z0(j,i) ) - &
	413	LOG( (1.0_wp + a )*2 ( 1.0_wp + a**2 ) / ( &
	414	(1.0_wp + b )*2 ( 1.0_wp + b**2 ) ) ) + &
	415	2.0_wp * ( ATAN( a ) - ATAN( b ) ) &
[1]	416	)
	417	ENDIF
[1340]	418	vsws(j,i) = -vsws(j,i) * 0.5_wp * ( us(j-1,i) + us(j,i) )
[1]	419	ENDDO
	420	ENDDO
	421
	422	!
[1494]	423	!-- If required compute qr* and nr*
	424	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. precipitation ) THEN
[1276]	425
[1494]	426	!$OMP PARALLEL DO PRIVATE( a, b, k, z_p )
	427	!$acc kernels loop independent
	428	DO i = nxlg, nxrg
	429	!$acc loop independent
	430	DO j = nysg, nyng
[1276]	431
[1494]	432	k = nzb_s_inner(j,i)
	433	z_p = zu(k+1) - zw(k)
[1]	434
[1494]	435	IF ( rif(j,i) >= 0.0 ) THEN
[108]	436	!
[1494]	437	!-- Stable stratification
	438	qrs(j,i) = kappa * ( qr(k+1,j,i) - qr(k,j,i) ) / ( &
	439	LOG( z_p / z0h(j,i) ) + &
	440	5.0 * rif(j,i) * ( z_p - z0h(j,i) ) / z_p )
	441	nrs(j,i) = kappa * ( nr(k+1,j,i) - nr(k,j,i) ) / ( &
	442	LOG( z_p / z0h(j,i) ) + &
	443	5.0 * rif(j,i) * ( z_p - z0h(j,i) ) / z_p )
[1]	444
[1494]	445	ELSE
[1361]	446	!
[1494]	447	!-- Unstable stratification
	448	a = SQRT( 1.0 - 16.0 * rif(j,i) )
	449	b = SQRT( 1.0 - 16.0 * rif(j,i) * z0h(j,i) / z_p )
[1361]	450
[1494]	451	qrs(j,i) = kappa * ( qr(k+1,j,i) - qr(k,j,i) ) / ( &
	452	LOG( z_p / z0h(j,i) ) - &
	453	2.0 * LOG( (1.0 + a ) / ( 1.0 + b ) ) )
	454	nrs(j,i) = kappa * ( nr(k+1,j,i) - nr(k,j,i) ) / ( &
	455	LOG( z_p / z0h(j,i) ) - &
	456	2.0 * LOG( (1.0 + a ) / ( 1.0 + b ) ) )
[1361]	457
[1494]	458	ENDIF
[1361]	459
	460	ENDDO
[1494]	461	ENDDO
[1361]	462
[1]	463	ENDIF
	464
	465	!
[187]	466	!-- Exchange the boundaries for the momentum fluxes (only for sake of
	467	!-- completeness)
[1015]	468	!$acc update host( usws, vsws )
[1]	469	CALL exchange_horiz_2d( usws )
	470	CALL exchange_horiz_2d( vsws )
[1015]	471	!$acc update device( usws, vsws )
	472	IF ( humidity .OR. passive_scalar ) THEN
	473	!$acc update host( qsws )
	474	CALL exchange_horiz_2d( qsws )
	475	!$acc update device( qsws )
[1361]	476	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. &
	477	precipitation ) THEN
	478	!$acc update host( qrsws, nrsws )
	479	CALL exchange_horiz_2d( qrsws )
	480	CALL exchange_horiz_2d( nrsws )
	481	!$acc update device( qrsws, nrsws )
	482	ENDIF
[1015]	483	ENDIF
[1]	484
	485	!
	486	!-- Compute the vertical kinematic heat flux
[1551]	487	IF ( .NOT. constant_heatflux ) THEN
[1]	488	!$OMP PARALLEL DO
[1257]	489	!$acc kernels loop independent
[667]	490	DO i = nxlg, nxrg
[1257]	491	!$acc loop independent
[667]	492	DO j = nysg, nyng
[1]	493	shf(j,i) = -ts(j,i) * us(j,i)
	494	ENDDO
	495	ENDDO
	496	ENDIF
	497
	498	!
	499	!-- Compute the vertical water/scalar flux
[1551]	500	IF ( .NOT. constant_waterflux .AND. ( humidity .OR. passive_scalar ) ) THEN
[1]	501	!$OMP PARALLEL DO
[1257]	502	!$acc kernels loop independent
[667]	503	DO i = nxlg, nxrg
[1257]	504	!$acc loop independent
[667]	505	DO j = nysg, nyng
[1]	506	qsws(j,i) = -qs(j,i) * us(j,i)
	507	ENDDO
	508	ENDDO
	509	ENDIF
	510
	511	!
[1361]	512	!-- Compute (turbulent) fluxes of rain water content and rain drop concentartion
	513	IF ( cloud_physics .AND. icloud_scheme == 0 .AND. precipitation ) THEN
	514	!$OMP PARALLEL DO
	515	!$acc kernels loop independent
	516	DO i = nxlg, nxrg
	517	!$acc loop independent
	518	DO j = nysg, nyng
	519	qrsws(j,i) = -qrs(j,i) * us(j,i)
	520	nrsws(j,i) = -nrs(j,i) * us(j,i)
	521	ENDDO
	522	ENDDO
	523	ENDIF
	524
	525	!
[1]	526	!-- Bottom boundary condition for the TKE
	527	IF ( ibc_e_b == 2 ) THEN
	528	!$OMP PARALLEL DO
[1257]	529	!$acc kernels loop independent
[667]	530	DO i = nxlg, nxrg
[1257]	531	!$acc loop independent
[667]	532	DO j = nysg, nyng
[1340]	533	e(nzb_s_inner(j,i)+1,j,i) = ( us(j,i) / 0.1_wp )**2
[1]	534	!
	535	!-- As a test: cm = 0.4
[1340]	536	! e(nzb_s_inner(j,i)+1,j,i) = ( us(j,i) / 0.4_wp )**2
[1]	537	e(nzb_s_inner(j,i),j,i) = e(nzb_s_inner(j,i)+1,j,i)
	538	ENDDO
	539	ENDDO
	540	ENDIF
	541
[1015]	542	!$acc end data
[1]	543
	544	END SUBROUTINE prandtl_fluxes

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