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source: palm/trunk/SOURCE/plant_canopy_model_mod.f90 @ 4302

Last change on this file since 4302 was 4302, checked in by suehring, 4 years ago
Omit tall canopy mapped on top of buildings, which may happen due to topography filtering
Property svn:keywords set to `Id`
File size: 92.0 KB

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1	!> @file plant_canopy_model_mod.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! 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	!
17	! Copyright 1997-2019 Leibniz Universitaet Hannover
18	! Copyright 2017-2019 Institute of Computer Science of the
19	! Czech Academy of Sciences, Prague
20	!------------------------------------------------------------------------------!
21	!
22	! Current revisions:
23	! ------------------
24	!
25	!
26	! Former revisions:
27	! -----------------
28	! $Id: plant_canopy_model_mod.f90 4302 2019-11-22 13:15:56Z suehring $
29	! Omit tall canopy mapped on top of buildings
30	!
31	! 4279 2019-10-29 08:48:17Z scharf
32	! unused variables removed
33	!
34	! 4258 2019-10-07 13:29:08Z scharf
35	! changed check for static driver and fixed bugs in initialization and header
36	!
37	! 4258 2019-10-07 13:29:08Z suehring
38	! Check if any LAD is prescribed when plant-canopy model is applied.
39	!
40	! 4226 2019-09-10 17:03:24Z suehring
41	! Bugfix, missing initialization of heating rate
42	!
43	! 4221 2019-09-09 08:50:35Z suehring
44	! Further bugfix in 3d data output for plant canopy
45	!
46	! 4216 2019-09-04 09:09:03Z suehring
47	! Bugfixes in 3d data output
48	!
49	! 4205 2019-08-30 13:25:00Z suehring
50	! Missing working precision + bugfix in calculation of wind speed
51	!
52	! 4188 2019-08-26 14:15:47Z suehring
53	! Minor adjustment in error number
54	!
55	! 4187 2019-08-26 12:43:15Z suehring
56	! Give specific error numbers instead of PA0999
57	!
58	! 4182 2019-08-22 15:20:23Z scharf
59	! Corrected "Former revisions" section
60	!
61	! 4168 2019-08-16 13:50:17Z suehring
62	! Replace function get_topography_top_index by topo_top_ind
63	!
64	! 4127 2019-07-30 14:47:10Z suehring
65	! Output of 3D plant canopy variables changed. It is now relative to the local
66	! terrain rather than located at the acutal vertical level in the model. This
67	! way, the vertical dimension of the output can be significantly reduced.
68	! (merge from branch resler)
69	!
70	! 3885 2019-04-11 11:29:34Z kanani
71	! Changes related to global restructuring of location messages and introduction
72	! of additional debug messages
73	!
74	! 3864 2019-04-05 09:01:56Z monakurppa
75	! unsed variables removed
76	!
77	! 3745 2019-02-15 18:57:56Z suehring
78	! Bugfix in transpiration, floating invalid when temperature
79	! becomes > 40 degrees
80	!
81	! 3744 2019-02-15 18:38:58Z suehring
82	! Some interface calls moved to module_interface + cleanup
83	!
84	! 3655 2019-01-07 16:51:22Z knoop
85	! unused variables removed
86	!
87	! 138 2007-11-28 10:03:58Z letzel
88	! Initial revision
89	!
90	! Description:
91	! ------------
92	!> 1) Initialization of the canopy model, e.g. construction of leaf area density
93	!> profile (subroutine pcm_init).
94	!> 2) Calculation of sinks and sources of momentum, heat and scalar concentration
95	!> due to canopy elements (subroutine pcm_tendency).
96	!
97	! @todo - precalculate constant terms in pcm_calc_transpiration_rate
98	! @todo - unify variable names (pcm_, pc_, ...)
99	!------------------------------------------------------------------------------!
100	MODULE plant_canopy_model_mod
101
102	USE arrays_3d, &
103	ONLY: dzu, dzw, e, exner, hyp, pt, q, s, tend, u, v, w, zu, zw
104
105	USE basic_constants_and_equations_mod, &
106	ONLY: c_p, degc_to_k, l_v, lv_d_cp, r_d, rd_d_rv
107
108	USE control_parameters, &
109	ONLY: debug_output, humidity
110
111	USE indices, &
112	ONLY: nbgp, nxl, nxlg, nxlu, nxr, nxrg, nyn, nyng, nys, nysg, nysv, &
113	nz, nzb, nzt, topo_top_ind
114
115	USE kinds
116
117	USE pegrid
118
119
120	IMPLICIT NONE
121
122
123	CHARACTER (LEN=30) :: canopy_mode = 'block' !< canopy coverage
124	LOGICAL :: plant_canopy_transpiration = .FALSE. !< flag to switch calculation of transpiration and corresponding latent heat
125	!< for resolved plant canopy inside radiation model
126	!< (calls subroutine pcm_calc_transpiration_rate from module plant_canopy_mod)
127
128	INTEGER(iwp) :: pch_index = 0 !< plant canopy height/top index
129	INTEGER(iwp) :: lad_vertical_gradient_level_ind(10) = -9999 !< lad-profile levels (index)
130
131	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: pch_index_ji !< local plant canopy top
132
133	LOGICAL :: calc_beta_lad_profile = .FALSE. !< switch for calc. of lad from beta func.
134
135	REAL(wp) :: alpha_lad = 9999999.9_wp !< coefficient for lad calculation
136	REAL(wp) :: beta_lad = 9999999.9_wp !< coefficient for lad calculation
137	REAL(wp) :: canopy_drag_coeff = 0.0_wp !< canopy drag coefficient (parameter)
138	REAL(wp) :: cdc = 0.0_wp !< canopy drag coeff. (abbreviation used in equations)
139	REAL(wp) :: cthf = 0.0_wp !< canopy top heat flux
140	REAL(wp) :: dt_plant_canopy = 0.0_wp !< timestep account. for canopy drag
141	REAL(wp) :: ext_coef = 0.6_wp !< extinction coefficient
142	REAL(wp) :: lad_surface = 0.0_wp !< lad surface value
143	REAL(wp) :: lai_beta = 0.0_wp !< leaf area index (lai) for lad calc.
144	REAL(wp) :: leaf_scalar_exch_coeff = 0.0_wp !< canopy scalar exchange coeff.
145	REAL(wp) :: leaf_surface_conc = 0.0_wp !< leaf surface concentration
146	REAL(wp) :: lsc = 0.0_wp !< leaf surface concentration
147	REAL(wp) :: lsec = 0.0_wp !< leaf scalar exchange coeff.
148
149	REAL(wp) :: lad_vertical_gradient(10) = 0.0_wp !< lad gradient
150	REAL(wp) :: lad_vertical_gradient_level(10) = -9999999.9_wp !< lad-prof. levels (in m)
151
152	REAL(wp) :: lad_type_coef(0:10) = 1.0_wp !< multiplicative coeficients for particular types
153	!< of plant canopy (e.g. deciduous tree during winter)
154
155	REAL(wp), DIMENSION(:), ALLOCATABLE :: lad !< leaf area density
156	REAL(wp), DIMENSION(:), ALLOCATABLE :: pre_lad !< preliminary lad
157
158	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: cum_lai_hf !< cumulative lai for heatflux calc.
159	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: lad_s !< lad on scalar-grid
160	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pc_heating_rate !< plant canopy heating rate
161	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pc_transpiration_rate !< plant canopy transpiration rate
162	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pc_latent_rate !< plant canopy latent heating rate
163
164	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pcm_heatrate_av !< array for averaging plant canopy sensible heating rate
165	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pcm_latentrate_av !< array for averaging plant canopy latent heating rate
166	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pcm_transpirationrate_av !< array for averaging plant canopy transpiration rate
167
168	SAVE
169
170
171	PRIVATE
172
173	!
174	!-- Public functions
175	PUBLIC pcm_calc_transpiration_rate, pcm_check_data_output, &
176	pcm_check_parameters, pcm_3d_data_averaging, &
177	pcm_data_output_3d, pcm_define_netcdf_grid, &
178	pcm_header, pcm_init, pcm_parin, pcm_tendency
179
180	!
181	!-- Public variables and constants
182	PUBLIC cdc, pc_heating_rate, pc_transpiration_rate, pc_latent_rate, &
183	canopy_mode, cthf, dt_plant_canopy, lad, lad_s, pch_index, &
184	plant_canopy_transpiration
185
186	INTERFACE pcm_calc_transpiration_rate
187	MODULE PROCEDURE pcm_calc_transpiration_rate
188	END INTERFACE pcm_calc_transpiration_rate
189
190	INTERFACE pcm_check_data_output
191	MODULE PROCEDURE pcm_check_data_output
192	END INTERFACE pcm_check_data_output
193
194	INTERFACE pcm_check_parameters
195	MODULE PROCEDURE pcm_check_parameters
196	END INTERFACE pcm_check_parameters
197
198	INTERFACE pcm_3d_data_averaging
199	MODULE PROCEDURE pcm_3d_data_averaging
200	END INTERFACE pcm_3d_data_averaging
201
202	INTERFACE pcm_data_output_3d
203	MODULE PROCEDURE pcm_data_output_3d
204	END INTERFACE pcm_data_output_3d
205
206	INTERFACE pcm_define_netcdf_grid
207	MODULE PROCEDURE pcm_define_netcdf_grid
208	END INTERFACE pcm_define_netcdf_grid
209
210	INTERFACE pcm_header
211	MODULE PROCEDURE pcm_header
212	END INTERFACE pcm_header
213
214	INTERFACE pcm_init
215	MODULE PROCEDURE pcm_init
216	END INTERFACE pcm_init
217
218	INTERFACE pcm_parin
219	MODULE PROCEDURE pcm_parin
220	END INTERFACE pcm_parin
221
222	INTERFACE pcm_read_plant_canopy_3d
223	MODULE PROCEDURE pcm_read_plant_canopy_3d
224	END INTERFACE pcm_read_plant_canopy_3d
225
226	INTERFACE pcm_tendency
227	MODULE PROCEDURE pcm_tendency
228	MODULE PROCEDURE pcm_tendency_ij
229	END INTERFACE pcm_tendency
230
231
232	CONTAINS
233
234
235
236	!------------------------------------------------------------------------------!
237	! Description:
238	! ------------
239	!> Calculation of the plant canopy transpiration rate based on the Jarvis-Stewart
240	!> with parametrizations described in Daudet et al. (1999; Agricult. and Forest
241	!> Meteorol. 97) and Ngao, Adam and Saudreau (2017; Agricult. and Forest Meteorol
242	!> 237-238). Model functions f1-f4 were adapted from Stewart (1998; Agric.
243	!> and Forest. Meteorol. 43) instead, because they are valid for broader intervals
244	!> of values. Funcion f4 used in form present in van Wijk et al. (1998;
245	!> Tree Physiology 20).
246	!>
247	!> This subroutine is called from subroutine radiation_interaction
248	!> after the calculation of radiation in plant canopy boxes.
249	!> (arrays pcbinsw and pcbinlw).
250	!>
251	!------------------------------------------------------------------------------!
252	SUBROUTINE pcm_calc_transpiration_rate(i, j, k, kk, pcbsw, pcblw, pcbtr, pcblh)
253
254	USE control_parameters, &
255	ONLY: dz
256
257	USE grid_variables, &
258	ONLY: dx, dy
259
260	IMPLICIT NONE
261	!-- input parameters
262	INTEGER(iwp), INTENT(IN) :: i, j, k, kk !< indices of the pc gridbox
263	REAL(wp), INTENT(IN) :: pcbsw !< sw radiation in gridbox (W)
264	REAL(wp), INTENT(IN) :: pcblw !< lw radiation in gridbox (W)
265	REAL(wp), INTENT(OUT) :: pcbtr !< transpiration rate dq/dt (kg/kg/s)
266	REAL(wp), INTENT(OUT) :: pcblh !< latent heat from transpiration dT/dt (K/s)
267
268	!-- variables and parameters for calculation of transpiration rate
269	REAL(wp) :: sat_press, sat_press_d, temp, v_lad
270	REAL(wp) :: d_fact, g_b, g_s, wind_speed, evapor_rate
271	REAL(wp) :: f1, f2, f3, f4, vpd, rswc, e_eq, e_imp, rad
272	REAL(wp), PARAMETER :: gama_psychr = 66.0_wp !< psychrometric constant (Pa/K)
273	REAL(wp), PARAMETER :: g_s_max = 0.01 !< maximum stomatal conductivity (m/s)
274	REAL(wp), PARAMETER :: m_soil = 0.4_wp !< soil water content (needs to adjust or take from LSM)
275	REAL(wp), PARAMETER :: m_wilt = 0.01_wp !< wilting point soil water content (needs to adjust or take from LSM)
276	REAL(wp), PARAMETER :: m_sat = 0.51_wp !< saturation soil water content (needs to adjust or take from LSM)
277	REAL(wp), PARAMETER :: t2_min = 0.0_wp !< minimal temperature for calculation of f2
278	REAL(wp), PARAMETER :: t2_max = 40.0_wp !< maximal temperature for calculation of f2
279
280
281	!-- Temperature (deg C)
282	temp = pt(k,j,i) * exner(k) - degc_to_k
283	!-- Coefficient for conversion of radiation to grid to radiation to unit leaves surface
284	v_lad = 1.0_wp / ( MAX( lad_s(kk,j,i), 1.0E-10_wp ) * dx * dy * dz(1) )
285	!-- Magnus formula for the saturation pressure (see Ngao, Adam and Saudreau (2017) eq. 1)
286	!-- There are updated formulas available, kept consistent with the rest of the parametrization
287	sat_press = 610.8_wp * exp(17.27_wp * temp/(temp + 237.3_wp))
288	!-- Saturation pressure derivative (derivative of the above)
289	sat_press_d = sat_press * 17.27_wp * 237.3_wp / (temp + 237.3_wp)**2
290	!-- Wind speed
291	wind_speed = SQRT( ( 0.5_wp * ( u(k,j,i) + u(k,j,i+1) ) )**2 + &
292	( 0.5_wp * ( v(k,j,i) + v(k,j+1,i) ) )**2 + &
293	( 0.5_wp * ( w(k,j,i) + w(k-1,j,i) ) )**2 )
294	!-- Aerodynamic conductivity (Daudet et al. (1999) eq. 14
295	g_b = 0.01_wp * wind_speed + 0.0071_wp
296	!-- Radiation flux per leaf surface unit
297	rad = pcbsw * v_lad
298	!-- First function for calculation of stomatal conductivity (radiation dependency)
299	!-- Stewart (1988; Agric. and Forest. Meteorol. 43) eq. 17
300	f1 = rad * (1000.0_wp+42.1_wp) / 1000.0_wp / (rad+42.1_wp)
301	!-- Second function for calculation of stomatal conductivity (temperature dependency)
302	!-- Stewart (1988; Agric. and Forest. Meteorol. 43) eq. 21
303	f2 = MAX(t2_min, (temp-t2_min) * MAX(0.0_wp,t2_max-temp)**((t2_max-16.9_wp)/(16.9_wp-t2_min)) / &
304	((16.9_wp-t2_min) * (t2_max-16.9_wp)**((t2_max-16.9_wp)/(16.9_wp-t2_min))) )
305	!-- Water pressure deficit
306	!-- Ngao, Adam and Saudreau (2017) eq. 6 but with water vapour partial pressure
307	vpd = max( sat_press - q(k,j,i) * hyp(k) / rd_d_rv, 0._wp )
308	!-- Third function for calculation of stomatal conductivity (water pressure deficit dependency)
309	!-- Ngao, Adam and Saudreau (2017) Table 1, limited from below according to Stewart (1988)
310	!-- The coefficients of the linear dependence should better correspond to broad-leaved trees
311	!-- than the coefficients from Stewart (1988) which correspond to conifer trees.
312	vpd = MIN(MAX(vpd,770.0_wp),3820.0_wp)
313	f3 = -2E-4_wp * vpd + 1.154_wp
314	!-- Fourth function for calculation of stomatal conductivity (soil moisture dependency)
315	!-- Residual soil water content
316	!-- van Wijk et al. (1998; Tree Physiology 20) eq. 7
317	!-- TODO - over LSM surface might be calculated from LSM parameters
318	rswc = ( m_sat - m_soil ) / ( m_sat - m_wilt )
319	!-- van Wijk et al. (1998; Tree Physiology 20) eq. 5-6 (it is a reformulation of eq. 22-23 of Stewart(1988))
320	f4 = MAX(0.0_wp, MIN(1.0_wp - 0.041_wp * EXP(3.2_wp * rswc), 1.0_wp - 0.041_wp))
321	!-- Stomatal conductivity
322	!-- Stewart (1988; Agric. and Forest. Meteorol. 43) eq. 12
323	!-- (notation according to Ngao, Adam and Saudreau (2017) and others)
324	g_s = g_s_max * f1 * f2 * f3 * f4 + 1.0E-10_wp
325	!-- Decoupling factor
326	!-- Daudet et al. (1999) eq. 6
327	d_fact = (sat_press_d / gama_psychr + 2.0_wp ) / &
328	(sat_press_d / gama_psychr + 2.0_wp + 2.0_wp * g_b / g_s )
329	!-- Equilibrium evaporation rate
330	!-- Daudet et al. (1999) eq. 4
331	e_eq = (pcbsw + pcblw) * v_lad * sat_press_d / &
332	gama_psychr /( sat_press_d / gama_psychr + 2.0_wp ) / l_v
333	!-- Imposed evaporation rate
334	!-- Daudet et al. (1999) eq. 5
335	e_imp = r_d * pt(k,j,i) * exner(k) / hyp(k) * c_p * g_s * vpd / gama_psychr / l_v
336	!-- Evaporation rate
337	!-- Daudet et al. (1999) eq. 3
338	!-- (evaporation rate is limited to non-negative values)
339	evapor_rate = MAX(d_fact * e_eq + ( 1.0_wp - d_fact ) * e_imp, 0.0_wp)
340	!-- Conversion of evaporation rate to q tendency in gridbox
341	!-- dq/dt = E * LAD * V_g / (rho_air * V_g)
342	pcbtr = evapor_rate * r_d * pt(k,j,i) * exner(k) * lad_s(kk,j,i) / hyp(k) !-- = dq/dt
343	!-- latent heat from evaporation
344	pcblh = pcbtr * lv_d_cp !-- = - dT/dt
345
346	END SUBROUTINE pcm_calc_transpiration_rate
347
348
349	!------------------------------------------------------------------------------!
350	! Description:
351	! ------------
352	!> Check data output for plant canopy model
353	!------------------------------------------------------------------------------!
354	SUBROUTINE pcm_check_data_output( var, unit )
355
356	USE control_parameters, &
357	ONLY: message_string, urban_surface
358
359	IMPLICIT NONE
360
361	CHARACTER (LEN=*) :: unit !<
362	CHARACTER (LEN=*) :: var !<
363
364
365	SELECT CASE ( TRIM( var ) )
366
367	CASE ( 'pcm_heatrate' )
368	IF ( cthf == 0.0_wp .AND. .NOT. urban_surface ) THEN
369	message_string = 'output of "' // TRIM( var ) // '" requi' // &
370	'res setting of parameter cthf /= 0.0'
371	CALL message( 'pcm_check_data_output', 'PA1000', 1, 2, 0, 6, 0 )
372	ENDIF
373	unit = 'K s-1'
374
375	CASE ( 'pcm_transpirationrate' )
376	unit = 'kg kg-1 s-1'
377
378	CASE ( 'pcm_latentrate' )
379	unit = 'K s-1'
380
381	CASE ( 'pcm_bowenratio' )
382	unit = 'K s-1'
383
384	CASE ( 'pcm_lad' )
385	unit = 'm2 m-3'
386
387
388	CASE DEFAULT
389	unit = 'illegal'
390
391	END SELECT
392
393
394	END SUBROUTINE pcm_check_data_output
395
396
397	!------------------------------------------------------------------------------!
398	! Description:
399	! ------------
400	!> Check parameters routine for plant canopy model
401	!------------------------------------------------------------------------------!
402	SUBROUTINE pcm_check_parameters
403
404	USE control_parameters, &
405	ONLY: message_string
406
407	USE bulk_cloud_model_mod, &
408	ONLY: bulk_cloud_model, microphysics_seifert
409
410	USE netcdf_data_input_mod, &
411	ONLY: input_pids_static
412
413
414	IMPLICIT NONE
415
416	IF ( canopy_drag_coeff == 0.0_wp ) THEN
417	message_string = 'plant_canopy = .TRUE. requires a non-zero drag '// &
418	'coefficient & given value is canopy_drag_coeff = 0.0'
419	CALL message( 'pcm_check_parameters', 'PA0041', 1, 2, 0, 6, 0 )
420	ENDIF
421
422	IF ( ( alpha_lad /= 9999999.9_wp .AND. beta_lad == 9999999.9_wp ) .OR.&
423	beta_lad /= 9999999.9_wp .AND. alpha_lad == 9999999.9_wp ) THEN
424	message_string = 'using the beta function for the construction ' // &
425	'of the leaf area density profile requires ' // &
426	'both alpha_lad and beta_lad to be /= 9999999.9'
427	CALL message( 'pcm_check_parameters', 'PA0118', 1, 2, 0, 6, 0 )
428	ENDIF
429
430	IF ( calc_beta_lad_profile .AND. lai_beta == 0.0_wp ) THEN
431	message_string = 'using the beta function for the construction ' // &
432	'of the leaf area density profile requires ' // &
433	'a non-zero lai_beta, but given value is ' // &
434	'lai_beta = 0.0'
435	CALL message( 'pcm_check_parameters', 'PA0119', 1, 2, 0, 6, 0 )
436	ENDIF
437
438	IF ( calc_beta_lad_profile .AND. lad_surface /= 0.0_wp ) THEN
439	message_string = 'simultaneous setting of alpha_lad /= 9999999.9 '// &
440	'combined with beta_lad /= 9999999.9 ' // &
441	'and lad_surface /= 0.0 is not possible, ' // &
442	'use either vertical gradients or the beta ' // &
443	'function for the construction of the leaf area '// &
444	'density profile'
445	CALL message( 'pcm_check_parameters', 'PA0120', 1, 2, 0, 6, 0 )
446	ENDIF
447
448	IF ( bulk_cloud_model .AND. microphysics_seifert ) THEN
449	message_string = 'plant_canopy = .TRUE. requires cloud_scheme /=' // &
450	' seifert_beheng'
451	CALL message( 'pcm_check_parameters', 'PA0360', 1, 2, 0, 6, 0 )
452	ENDIF
453	!
454	!-- If canopy shall be read from file, static input file must be present
455	IF ( TRIM( canopy_mode ) == 'read_from_file_3d' .AND. &
456	.NOT. input_pids_static ) THEN
457	message_string = 'canopy_mode = read_from_file_3d requires ' // &
458	'static input file'
459	CALL message( 'pcm_check_parameters', 'PA0672', 1, 2, 0, 6, 0 )
460	ENDIF
461
462
463	END SUBROUTINE pcm_check_parameters
464
465
466	!------------------------------------------------------------------------------!
467	!
468	! Description:
469	! ------------
470	!> Subroutine for averaging 3D data
471	!------------------------------------------------------------------------------!
472	SUBROUTINE pcm_3d_data_averaging( mode, variable )
473
474
475	USE control_parameters
476
477	USE indices
478
479	USE kinds
480
481	IMPLICIT NONE
482
483	CHARACTER (LEN=*) :: mode !<
484	CHARACTER (LEN=*) :: variable !<
485
486	INTEGER(iwp) :: i !<
487	INTEGER(iwp) :: j !<
488	INTEGER(iwp) :: k !<
489
490
491	IF ( mode == 'allocate' ) THEN
492
493	SELECT CASE ( TRIM( variable ) )
494
495	CASE ( 'pcm_heatrate' )
496	IF ( .NOT. ALLOCATED( pcm_heatrate_av ) ) THEN
497	ALLOCATE( pcm_heatrate_av(0:pch_index,nysg:nyng,nxlg:nxrg) )
498	ENDIF
499	pcm_heatrate_av = 0.0_wp
500
501
502	CASE ( 'pcm_latentrate' )
503	IF ( .NOT. ALLOCATED( pcm_latentrate_av ) ) THEN
504	ALLOCATE( pcm_latentrate_av(0:pch_index,nysg:nyng,nxlg:nxrg) )
505	ENDIF
506	pcm_latentrate_av = 0.0_wp
507
508
509	CASE ( 'pcm_transpirationrate' )
510	IF ( .NOT. ALLOCATED( pcm_transpirationrate_av ) ) THEN
511	ALLOCATE( pcm_transpirationrate_av(0:pch_index,nysg:nyng,nxlg:nxrg) )
512	ENDIF
513	pcm_transpirationrate_av = 0.0_wp
514
515	CASE DEFAULT
516	CONTINUE
517
518	END SELECT
519
520	ELSEIF ( mode == 'sum' ) THEN
521
522	SELECT CASE ( TRIM( variable ) )
523
524	CASE ( 'pcm_heatrate' )
525	IF ( ALLOCATED( pcm_heatrate_av ) ) THEN
526	DO i = nxl, nxr
527	DO j = nys, nyn
528	IF ( pch_index_ji(j,i) /= 0 ) THEN
529	DO k = 0, pch_index_ji(j,i)
530	pcm_heatrate_av(k,j,i) = pcm_heatrate_av(k,j,i) + pc_heating_rate(k,j,i)
531	ENDDO
532	ENDIF
533	ENDDO
534	ENDDO
535	ENDIF
536
537
538	CASE ( 'pcm_latentrate' )
539	IF ( ALLOCATED( pcm_latentrate_av ) ) THEN
540	DO i = nxl, nxr
541	DO j = nys, nyn
542	IF ( pch_index_ji(j,i) /= 0 ) THEN
543	DO k = 0, pch_index_ji(j,i)
544	pcm_latentrate_av(k,j,i) = pcm_latentrate_av(k,j,i) + pc_latent_rate(k,j,i)
545	ENDDO
546	ENDIF
547	ENDDO
548	ENDDO
549	ENDIF
550
551
552	CASE ( 'pcm_transpirationrate' )
553	IF ( ALLOCATED( pcm_transpirationrate_av ) ) THEN
554	DO i = nxl, nxr
555	DO j = nys, nyn
556	IF ( pch_index_ji(j,i) /= 0 ) THEN
557	DO k = 0, pch_index_ji(j,i)
558	pcm_transpirationrate_av(k,j,i) = pcm_transpirationrate_av(k,j,i) + pc_transpiration_rate(k,j,i)
559	ENDDO
560	ENDIF
561	ENDDO
562	ENDDO
563	ENDIF
564
565	CASE DEFAULT
566	CONTINUE
567
568	END SELECT
569
570	ELSEIF ( mode == 'average' ) THEN
571
572	SELECT CASE ( TRIM( variable ) )
573
574	CASE ( 'pcm_heatrate' )
575	IF ( ALLOCATED( pcm_heatrate_av ) ) THEN
576	DO i = nxlg, nxrg
577	DO j = nysg, nyng
578	IF ( pch_index_ji(j,i) /= 0 ) THEN
579	DO k = 0, pch_index_ji(j,i)
580	pcm_heatrate_av(k,j,i) = pcm_heatrate_av(k,j,i) &
581	/ REAL( average_count_3d, KIND=wp )
582	ENDDO
583	ENDIF
584	ENDDO
585	ENDDO
586	ENDIF
587
588
589	CASE ( 'pcm_latentrate' )
590	IF ( ALLOCATED( pcm_latentrate_av ) ) THEN
591	DO i = nxlg, nxrg
592	DO j = nysg, nyng
593	IF ( pch_index_ji(j,i) /= 0 ) THEN
594	DO k = 0, pch_index_ji(j,i)
595	pcm_latentrate_av(k,j,i) = pcm_latentrate_av(k,j,i) &
596	/ REAL( average_count_3d, KIND=wp )
597	ENDDO
598	ENDIF
599	ENDDO
600	ENDDO
601	ENDIF
602
603
604	CASE ( 'pcm_transpirationrate' )
605	IF ( ALLOCATED( pcm_transpirationrate_av ) ) THEN
606	DO i = nxlg, nxrg
607	DO j = nysg, nyng
608	IF ( pch_index_ji(j,i) /= 0 ) THEN
609	DO k = 0, pch_index_ji(j,i)
610	pcm_transpirationrate_av(k,j,i) = pcm_transpirationrate_av(k,j,i) &
611	/ REAL( average_count_3d, KIND=wp )
612	ENDDO
613	ENDIF
614	ENDDO
615	ENDDO
616	ENDIF
617
618	END SELECT
619
620	ENDIF
621
622	END SUBROUTINE pcm_3d_data_averaging
623
624	!------------------------------------------------------------------------------!
625	!
626	! Description:
627	! ------------
628	!> Subroutine defining 3D output variables.
629	!> Note, 3D plant-canopy output has it's own vertical output dimension, meaning
630	!> that 3D output is relative to the model surface now rather than at the actual
631	!> grid point where the plant canopy is located.
632	!------------------------------------------------------------------------------!
633	SUBROUTINE pcm_data_output_3d( av, variable, found, local_pf, fill_value, &
634	nzb_do, nzt_do )
635
636	USE indices
637
638	USE kinds
639
640
641	IMPLICIT NONE
642
643	CHARACTER (LEN=*) :: variable !< treated variable
644
645	INTEGER(iwp) :: av !< flag indicating instantaneous or averaged data output
646	INTEGER(iwp) :: i !< grid index x-direction
647	INTEGER(iwp) :: j !< grid index y-direction
648	INTEGER(iwp) :: k !< grid index z-direction
649	INTEGER(iwp) :: nzb_do !< lower limit of the data output (usually 0)
650	INTEGER(iwp) :: nzt_do !< vertical upper limit of the data output (usually nz_do3d)
651
652	LOGICAL :: found !< flag indicating if variable is found
653
654	REAL(wp) :: fill_value !< fill value
655	REAL(sp), DIMENSION(nxl:nxr,nys:nyn,nzb_do:nzt_do) :: local_pf !< data output array
656
657
658	found = .TRUE.
659
660	local_pf = REAL( fill_value, KIND = 4 )
661
662	SELECT CASE ( TRIM( variable ) )
663	!
664	!-- Note, to save memory arrays for heating are allocated from 0:pch_index.
665	!-- Thus, output must be relative to these array indices. Further, check
666	!-- whether the output is within the vertical output range,
667	!-- i.e. nzb_do:nzt_do, which is necessary as local_pf is only allocated
668	!-- for this index space. Note, plant-canopy output has a separate
669	!-- vertical output coordinate zlad, so that output is mapped down to the
670	!-- surface.
671	CASE ( 'pcm_heatrate' )
672	IF ( av == 0 ) THEN
673	DO i = nxl, nxr
674	DO j = nys, nyn
675	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
676	local_pf(i,j,k) = pc_heating_rate(k,j,i)
677	ENDDO
678	ENDDO
679	ENDDO
680	ELSE
681	DO i = nxl, nxr
682	DO j = nys, nyn
683	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
684	local_pf(i,j,k) = pcm_heatrate_av(k,j,i)
685	ENDDO
686	ENDDO
687	ENDDO
688	ENDIF
689
690	CASE ( 'pcm_latentrate' )
691	IF ( av == 0 ) THEN
692	DO i = nxl, nxr
693	DO j = nys, nyn
694	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
695	local_pf(i,j,k) = pc_latent_rate(k,j,i)
696	ENDDO
697	ENDDO
698	ENDDO
699	ELSE
700	DO i = nxl, nxr
701	DO j = nys, nyn
702	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
703	local_pf(i,j,k) = pcm_latentrate_av(k,j,i)
704	ENDDO
705	ENDDO
706	ENDDO
707	ENDIF
708
709	CASE ( 'pcm_transpirationrate' )
710	IF ( av == 0 ) THEN
711	DO i = nxl, nxr
712	DO j = nys, nyn
713	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
714	local_pf(i,j,k) = pc_transpiration_rate(k,j,i)
715	ENDDO
716	ENDDO
717	ENDDO
718	ELSE
719	DO i = nxl, nxr
720	DO j = nys, nyn
721	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
722	local_pf(i,j,k) = pcm_transpirationrate_av(k,j,i)
723	ENDDO
724	ENDDO
725	ENDDO
726	ENDIF
727
728	CASE ( 'pcm_bowenratio' )
729	IF ( av == 0 ) THEN
730	DO i = nxl, nxr
731	DO j = nys, nyn
732	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
733	IF ( pc_latent_rate(k,j,i) /= 0.0_wp ) THEN
734	local_pf(i,j,k) = pc_heating_rate(k,j,i) / &
735	pc_latent_rate(k,j,i)
736	ENDIF
737	ENDDO
738	ENDDO
739	ENDDO
740	ELSE
741	DO i = nxl, nxr
742	DO j = nys, nyn
743	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
744	IF ( pcm_latentrate_av(k,j,i) /= 0.0_wp ) THEN
745	local_pf(i,j,k) = pcm_heatrate_av(k,j,i) / &
746	pcm_latentrate_av(k,j,i)
747	ENDIF
748	ENDDO
749	ENDDO
750	ENDDO
751	ENDIF
752
753	CASE ( 'pcm_lad' )
754	IF ( av == 0 ) THEN
755	DO i = nxl, nxr
756	DO j = nys, nyn
757	DO k = MAX( 1, nzb_do ), MIN( pch_index, nzt_do )
758	local_pf(i,j,k) = lad_s(k,j,i)
759	ENDDO
760	ENDDO
761	ENDDO
762	ENDIF
763
764	CASE DEFAULT
765	found = .FALSE.
766
767	END SELECT
768
769
770	END SUBROUTINE pcm_data_output_3d
771
772	!------------------------------------------------------------------------------!
773	!
774	! Description:
775	! ------------
776	!> Subroutine defining appropriate grid for netcdf variables.
777	!> It is called from subroutine netcdf.
778	!------------------------------------------------------------------------------!
779	SUBROUTINE pcm_define_netcdf_grid( var, found, grid_x, grid_y, grid_z )
780
781	IMPLICIT NONE
782
783	CHARACTER (LEN=*), INTENT(IN) :: var !<
784	LOGICAL, INTENT(OUT) :: found !<
785	CHARACTER (LEN=*), INTENT(OUT) :: grid_x !<
786	CHARACTER (LEN=*), INTENT(OUT) :: grid_y !<
787	CHARACTER (LEN=*), INTENT(OUT) :: grid_z !<
788
789	found = .TRUE.
790
791	!
792	!-- Check for the grid
793	SELECT CASE ( TRIM( var ) )
794
795	CASE ( 'pcm_heatrate', 'pcm_lad', 'pcm_transpirationrate', 'pcm_latentrate', 'pcm_bowenratio')
796	grid_x = 'x'
797	grid_y = 'y'
798	grid_z = 'zpc'
799
800	CASE DEFAULT
801	found = .FALSE.
802	grid_x = 'none'
803	grid_y = 'none'
804	grid_z = 'none'
805	END SELECT
806
807	END SUBROUTINE pcm_define_netcdf_grid
808
809
810	!------------------------------------------------------------------------------!
811	! Description:
812	! ------------
813	!> Header output for plant canopy model
814	!------------------------------------------------------------------------------!
815	SUBROUTINE pcm_header ( io )
816
817	USE control_parameters, &
818	ONLY: passive_scalar
819
820
821	IMPLICIT NONE
822
823	CHARACTER (LEN=10) :: coor_chr !<
824
825	CHARACTER (LEN=86) :: coordinates !<
826	CHARACTER (LEN=86) :: gradients !<
827	CHARACTER (LEN=86) :: leaf_area_density !<
828	CHARACTER (LEN=86) :: slices !<
829
830	INTEGER(iwp) :: i !<
831	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
832	INTEGER(iwp) :: k !<
833
834	REAL(wp) :: canopy_height !< canopy height (in m)
835
836	canopy_height = zw(pch_index)
837
838	WRITE ( io, 1 ) canopy_mode, canopy_height, pch_index, &
839	canopy_drag_coeff
840	IF ( passive_scalar ) THEN
841	WRITE ( io, 2 ) leaf_scalar_exch_coeff, &
842	leaf_surface_conc
843	ENDIF
844
845	!
846	!-- Heat flux at the top of vegetation
847	WRITE ( io, 3 ) cthf
848
849	!
850	!-- Leaf area density profile, calculated either from given vertical
851	!-- gradients or from beta probability density function.
852	IF ( .NOT. calc_beta_lad_profile ) THEN
853
854	!-- Building output strings, starting with surface value
855	WRITE ( leaf_area_density, '(F7.4)' ) lad_surface
856	gradients = '------'
857	slices = ' 0'
858	coordinates = ' 0.0'
859	DO i = 1, UBOUND(lad_vertical_gradient_level_ind, DIM=1)
860	IF ( lad_vertical_gradient_level_ind(i) /= -9999 ) THEN
861
862	WRITE (coor_chr,'(F7.2)') lad(lad_vertical_gradient_level_ind(i))
863	leaf_area_density = TRIM( leaf_area_density ) // ' ' // TRIM( coor_chr )
864
865	WRITE (coor_chr,'(F7.2)') lad_vertical_gradient(i)
866	gradients = TRIM( gradients ) // ' ' // TRIM( coor_chr )
867
868	WRITE (coor_chr,'(I7)') lad_vertical_gradient_level_ind(i)
869	slices = TRIM( slices ) // ' ' // TRIM( coor_chr )
870
871	WRITE (coor_chr,'(F7.1)') lad_vertical_gradient_level(i)
872	coordinates = TRIM( coordinates ) // ' ' // TRIM( coor_chr )
873	ELSE
874	EXIT
875	ENDIF
876	ENDDO
877
878	WRITE ( io, 4 ) TRIM( coordinates ), TRIM( leaf_area_density ), &
879	TRIM( gradients ), TRIM( slices )
880
881	ELSE
882
883	WRITE ( leaf_area_density, '(F7.4)' ) lad_surface
884	coordinates = ' 0.0'
885
886	DO k = 1, pch_index
887
888	WRITE (coor_chr,'(F7.2)') lad(k)
889	leaf_area_density = TRIM( leaf_area_density ) // ' ' // &
890	TRIM( coor_chr )
891
892	WRITE (coor_chr,'(F7.1)') zu(k)
893	coordinates = TRIM( coordinates ) // ' ' // TRIM( coor_chr )
894
895	ENDDO
896
897	WRITE ( io, 5 ) TRIM( coordinates ), TRIM( leaf_area_density ), &
898	alpha_lad, beta_lad, lai_beta
899
900	ENDIF
901
902	1 FORMAT (//' Vegetation canopy (drag) model:'/ &
903	' ------------------------------'// &
904	' Canopy mode: ', A / &
905	' Canopy height: ',F6.2,'m (',I4,' grid points)' / &
906	' Leaf drag coefficient: ',F6.2 /)
907	2 FORMAT (/ ' Scalar exchange coefficient: ',F6.2 / &
908	' Scalar concentration at leaf surfaces in kg/m**3: ',F6.2 /)
909	3 FORMAT (' Predefined constant heatflux at the top of the vegetation: ',F6.2, &
910	' K m/s')
911	4 FORMAT (/ ' Characteristic levels of the leaf area density:'// &
912	' Height: ',A,' m'/ &
913	' Leaf area density: ',A,' m2/m3'/ &
914	' Gradient: ',A,' m2/m4'/ &
915	' Gridpoint: ',A)
916	5 FORMAT (//' Characteristic levels of the leaf area density and coefficients:'&
917	// ' Height: ',A,' m'/ &
918	' Leaf area density: ',A,' m2/m3'/ &
919	' Coefficient alpha: ',F6.2 / &
920	' Coefficient beta: ',F6.2 / &
921	' Leaf area index: ',F6.2,' m2/m2' /)
922
923	END SUBROUTINE pcm_header
924
925
926	!------------------------------------------------------------------------------!
927	! Description:
928	! ------------
929	!> Initialization of the plant canopy model
930	!------------------------------------------------------------------------------!
931	SUBROUTINE pcm_init
932
933
934	USE control_parameters, &
935	ONLY: message_string, ocean_mode
936
937	USE indices, &
938	ONLY: wall_flags_0
939
940	USE netcdf_data_input_mod, &
941	ONLY: leaf_area_density_f
942
943	USE pegrid
944
945	USE surface_mod, &
946	ONLY: surf_def_h, surf_lsm_h, surf_usm_h
947
948	IMPLICIT NONE
949
950	INTEGER(iwp) :: i !< running index
951	INTEGER(iwp) :: j !< running index
952	INTEGER(iwp) :: k !< running index
953	INTEGER(iwp) :: m !< running index
954
955	REAL(wp) :: canopy_height !< canopy height for lad-profile construction
956	REAL(wp) :: gradient !< gradient for lad-profile construction
957	REAL(wp) :: int_bpdf !< vertical integral for lad-profile construction
958	REAL(wp) :: lad_max !< maximum LAD value in the model domain, used to perform a check
959
960	IF ( debug_output ) CALL debug_message( 'pcm_init', 'start' )
961	!
962	!-- Allocate one-dimensional arrays for the computation of the
963	!-- leaf area density (lad) profile
964	ALLOCATE( lad(0:nz+1), pre_lad(0:nz+1) )
965	lad = 0.0_wp
966	pre_lad = 0.0_wp
967
968	!
969	!-- Set flag that indicates that the lad-profile shall be calculated by using
970	!-- a beta probability density function
971	IF ( alpha_lad /= 9999999.9_wp .AND. beta_lad /= 9999999.9_wp ) THEN
972	calc_beta_lad_profile = .TRUE.
973	ENDIF
974
975
976	!
977	!-- Compute the profile of leaf area density used in the plant
978	!-- canopy model. The profile can either be constructed from
979	!-- prescribed vertical gradients of the leaf area density or by
980	!-- using a beta probability density function (see e.g. Markkanen et al.,
981	!-- 2003: Boundary-Layer Meteorology, 106, 437-459)
982	IF ( .NOT. calc_beta_lad_profile ) THEN
983
984	!
985	!-- Use vertical gradients for lad-profile construction
986	i = 1
987	gradient = 0.0_wp
988
989	IF ( .NOT. ocean_mode ) THEN
990
991	lad(0) = lad_surface
992	lad_vertical_gradient_level_ind(1) = 0
993
994	DO k = 1, pch_index
995	IF ( i < 11 ) THEN
996	IF ( lad_vertical_gradient_level(i) < zu(k) .AND. &
997	lad_vertical_gradient_level(i) >= 0.0_wp ) THEN
998	gradient = lad_vertical_gradient(i)
999	lad_vertical_gradient_level_ind(i) = k - 1
1000	i = i + 1
1001	ENDIF
1002	ENDIF
1003	IF ( gradient /= 0.0_wp ) THEN
1004	IF ( k /= 1 ) THEN
1005	lad(k) = lad(k-1) + dzu(k) * gradient
1006	ELSE
1007	lad(k) = lad_surface + dzu(k) * gradient
1008	ENDIF
1009	ELSE
1010	lad(k) = lad(k-1)
1011	ENDIF
1012	ENDDO
1013
1014	ENDIF
1015
1016	!
1017	!-- In case of no given leaf area density gradients, choose a vanishing
1018	!-- gradient. This information is used for the HEADER and the RUN_CONTROL
1019	!-- file.
1020	IF ( lad_vertical_gradient_level(1) == -9999999.9_wp ) THEN
1021	lad_vertical_gradient_level(1) = 0.0_wp
1022	ENDIF
1023
1024	ELSE
1025
1026	!
1027	!-- Use beta function for lad-profile construction
1028	int_bpdf = 0.0_wp
1029	canopy_height = zw(pch_index)
1030
1031	DO k = 0, pch_index
1032	int_bpdf = int_bpdf + &
1033	( ( ( zw(k) / canopy_height )*( alpha_lad-1.0_wp ) ) &
1034	( ( 1.0_wp - ( zw(k) / canopy_height ) )**( &
1035	beta_lad-1.0_wp ) ) &
1036	* ( ( zw(k+1)-zw(k) ) / canopy_height ) )
1037	ENDDO
1038
1039	!
1040	!-- Preliminary lad profile (defined on w-grid)
1041	DO k = 0, pch_index
1042	pre_lad(k) = lai_beta * &
1043	( ( ( zw(k) / canopy_height )**( alpha_lad-1.0_wp ) ) &
1044	* ( ( 1.0_wp - ( zw(k) / canopy_height ) )**( &
1045	beta_lad-1.0_wp ) ) / int_bpdf &
1046	) / canopy_height
1047	ENDDO
1048
1049	!
1050	!-- Final lad profile (defined on scalar-grid level, since most prognostic
1051	!-- quantities are defined there, hence, less interpolation is required
1052	!-- when calculating the canopy tendencies)
1053	lad(0) = pre_lad(0)
1054	DO k = 1, pch_index
1055	lad(k) = 0.5 * ( pre_lad(k-1) + pre_lad(k) )
1056	ENDDO
1057
1058	ENDIF
1059
1060	!
1061	!-- Allocate 3D-array for the leaf area density (lad_s).
1062	ALLOCATE( lad_s(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1063	!
1064	!-- Initialize canopy parameters cdc (canopy drag coefficient),
1065	!-- lsec (leaf scalar exchange coefficient), lsc (leaf surface concentration)
1066	!-- with the prescribed values
1067	cdc = canopy_drag_coeff
1068	lsec = leaf_scalar_exch_coeff
1069	lsc = leaf_surface_conc
1070
1071	!
1072	!-- Initialization of the canopy coverage in the model domain:
1073	!-- Setting the parameter canopy_mode = 'block' initializes a canopy, which
1074	!-- fully covers the domain surface
1075	SELECT CASE ( TRIM( canopy_mode ) )
1076
1077	CASE( 'block' )
1078
1079	DO i = nxlg, nxrg
1080	DO j = nysg, nyng
1081	lad_s(:,j,i) = lad(:)
1082	ENDDO
1083	ENDDO
1084
1085	CASE ( 'read_from_file_3d' )
1086	!
1087	!-- Initialize LAD with data from file. If LAD is given in NetCDF file,
1088	!-- use these values, else take LAD profiles from ASCII file.
1089	!-- Please note, in NetCDF file LAD is only given up to the maximum
1090	!-- canopy top, indicated by leaf_area_density_f%nz.
1091	lad_s = 0.0_wp
1092	IF ( leaf_area_density_f%from_file ) THEN
1093	!
1094	!-- Set also pch_index, used to be the upper bound of the vertical
1095	!-- loops. Therefore, use the global top of the canopy layer.
1096	pch_index = leaf_area_density_f%nz - 1
1097
1098	DO i = nxl, nxr
1099	DO j = nys, nyn
1100	DO k = 0, leaf_area_density_f%nz - 1
1101	IF ( leaf_area_density_f%var(k,j,i) /= &
1102	leaf_area_density_f%fill ) &
1103	lad_s(k,j,i) = leaf_area_density_f%var(k,j,i)
1104	ENDDO
1105	!
1106	!-- Check if resolved vegetation is mapped onto buildings.
1107	!-- Even if the user defines LAD only for non-building covered
1108	!-- grid points, the filter process of topography may cause
1109	!-- that LAD overlaps with buildings. This case, an
1110	!-- informative message is given and the LAD field is set to
1111	!-- zero at these
1112	IF ( ANY( lad_s(:,j,i) /= 0.0_wp ) .AND. &
1113	ANY( BTEST( wall_flags_0(:,j,i), 6 ) ) ) THEN
1114	lad_s(:,j,i) = 0.0_wp
1115	WRITE( message_string, * ) &
1116	'Resolved plant-canopy is ' // &
1117	'is defined on top of a building ' //&
1118	'- lad is omitted at this grid ' //&
1119	'point: (i,j) = ', i, j
1120	CALL message( 'pcm_init', 'PA0313', 0, 0, myid, 6, 0 )
1121	ENDIF
1122	ENDDO
1123	ENDDO
1124	CALL exchange_horiz( lad_s, nbgp )
1125	!
1126	! ASCII file
1127	!-- Initialize canopy parameters cdc (canopy drag coefficient),
1128	!-- lsec (leaf scalar exchange coefficient), lsc (leaf surface concentration)
1129	!-- from file which contains complete 3D data (separate vertical profiles for
1130	!-- each location).
1131	ELSE
1132	CALL pcm_read_plant_canopy_3d
1133	ENDIF
1134
1135	CASE DEFAULT
1136	!
1137	!-- The DEFAULT case is reached either if the parameter
1138	!-- canopy mode contains a wrong character string or if the
1139	!-- user has coded a special case in the user interface.
1140	!-- There, the subroutine user_init_plant_canopy checks
1141	!-- which of these two conditions applies.
1142	CALL user_init_plant_canopy
1143
1144	END SELECT
1145	!
1146	!-- Check that at least one grid point has an LAD /= 0, else this may
1147	!-- cause errors in the radiation model.
1148	lad_max = MAXVAL( lad_s )
1149	#if defined( __parallel )
1150	CALL MPI_ALLREDUCE( MPI_IN_PLACE, lad_max, 1, MPI_REAL, MPI_MAX, &
1151	comm2d, ierr)
1152	#endif
1153	IF ( lad_max <= 0.0_wp ) THEN
1154	message_string = 'Plant-canopy model is switched-on but no ' // &
1155	'plant canopy is present in the model domain.'
1156	CALL message( 'pcm_init', 'PA0685', 1, 2, 0, 6, 0 )
1157	ENDIF
1158
1159	!
1160	!-- Initialize 2D index array indicating canopy top index.
1161	ALLOCATE( pch_index_ji(nysg:nyng,nxlg:nxrg) )
1162	pch_index_ji = 0
1163
1164	DO i = nxl, nxr
1165	DO j = nys, nyn
1166	DO k = 0, pch_index
1167	IF ( lad_s(k,j,i) /= 0 ) pch_index_ji(j,i) = k
1168	ENDDO
1169	!
1170	!-- Check whether topography and local vegetation on top exceed
1171	!-- height of the model domain.
1172	k = topo_top_ind(j,i,0)
1173	IF ( k + pch_index_ji(j,i) >= nzt + 1 ) THEN
1174	message_string = 'Local vegetation height on top of ' // &
1175	'topography exceeds height of model domain.'
1176	CALL message( 'pcm_init', 'PA0674', 2, 2, 0, 6, 0 )
1177	ENDIF
1178
1179	ENDDO
1180	ENDDO
1181
1182	CALL exchange_horiz_2d_int( pch_index_ji, nys, nyn, nxl, nxr, nbgp )
1183	!
1184	!-- Calculate global pch_index value (index of top of plant canopy from ground)
1185	pch_index = MAXVAL( pch_index_ji )
1186
1187
1188	!
1189	!-- Exchange pch_index from all processors
1190	#if defined( __parallel )
1191	CALL MPI_ALLREDUCE( MPI_IN_PLACE, pch_index, 1, MPI_INTEGER, &
1192	MPI_MAX, comm2d, ierr)
1193	#endif
1194
1195	!-- Allocation of arrays pc_heating_rate, pc_transpiration_rate and pc_latent_rate
1196	ALLOCATE( pc_heating_rate(0:pch_index,nysg:nyng,nxlg:nxrg) )
1197	pc_heating_rate = 0.0_wp
1198
1199	IF ( humidity ) THEN
1200	ALLOCATE( pc_transpiration_rate(0:pch_index,nysg:nyng,nxlg:nxrg) )
1201	pc_transpiration_rate = 0.0_wp
1202	ALLOCATE( pc_latent_rate(0:pch_index,nysg:nyng,nxlg:nxrg) )
1203	pc_latent_rate = 0.0_wp
1204	ENDIF
1205	!
1206	!-- Initialization of the canopy heat source distribution due to heating
1207	!-- of the canopy layers by incoming solar radiation, in case that a non-zero
1208	!-- value is set for the canopy top heat flux (cthf), which equals the
1209	!-- available net radiation at canopy top.
1210	!-- The heat source distribution is calculated by a decaying exponential
1211	!-- function of the downward cumulative leaf area index (cum_lai_hf),
1212	!-- assuming that the foliage inside the plant canopy is heated by solar
1213	!-- radiation penetrating the canopy layers according to the distribution
1214	!-- of net radiation as suggested by Brown & Covey (1966; Agric. Meteorol. 3,
1215	!-- 73â96). This approach has been applied e.g. by Shaw & Schumann (1992;
1216	!-- Bound.-Layer Meteorol. 61, 47â64).
1217	!-- When using the radiation_interactions, canopy heating (pc_heating_rate)
1218	!-- and plant canopy transpiration (pc_transpiration_rate, pc_latent_rate)
1219	!-- are calculated in the RTM after the calculation of radiation.
1220	!-- We cannot use variable radiation_interactions here to determine the situation
1221	!-- as it is assigned in init_3d_model after the call of pcm_init.
1222	IF ( cthf /= 0.0_wp ) THEN
1223
1224	ALLOCATE( cum_lai_hf(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1225	!
1226	!-- Piecewise calculation of the cumulative leaf area index by vertical
1227	!-- integration of the leaf area density
1228	cum_lai_hf(:,:,:) = 0.0_wp
1229	DO i = nxlg, nxrg
1230	DO j = nysg, nyng
1231	DO k = pch_index_ji(j,i)-1, 0, -1
1232	IF ( k == pch_index_ji(j,i)-1 ) THEN
1233	cum_lai_hf(k,j,i) = cum_lai_hf(k+1,j,i) + &
1234	( 0.5_wp * lad_s(k+1,j,i) * &
1235	( zw(k+1) - zu(k+1) ) ) + &
1236	( 0.5_wp * ( 0.5_wp * ( lad_s(k+1,j,i) + &
1237	lad_s(k,j,i) ) + &
1238	lad_s(k+1,j,i) ) * &
1239	( zu(k+1) - zw(k) ) )
1240	ELSE
1241	cum_lai_hf(k,j,i) = cum_lai_hf(k+1,j,i) + &
1242	( 0.5_wp * ( 0.5_wp * ( lad_s(k+2,j,i) + &
1243	lad_s(k+1,j,i) ) + &
1244	lad_s(k+1,j,i) ) * &
1245	( zw(k+1) - zu(k+1) ) ) + &
1246	( 0.5_wp * ( 0.5_wp * ( lad_s(k+1,j,i) + &
1247	lad_s(k,j,i) ) + &
1248	lad_s(k+1,j,i) ) * &
1249	( zu(k+1) - zw(k) ) )
1250	ENDIF
1251	ENDDO
1252	ENDDO
1253	ENDDO
1254
1255	!
1256	!-- In areas with canopy the surface value of the canopy heat
1257	!-- flux distribution overrides the surface heat flux (shf)
1258	!-- Start with default surface type
1259	DO m = 1, surf_def_h(0)%ns
1260	i = surf_def_h(0)%i(m)
1261	j = surf_def_h(0)%j(m)
1262	k = surf_def_h(0)%k(m)
1263	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) &
1264	surf_def_h(0)%shf(m) = cthf * exp( -ext_coef * cum_lai_hf(0,j,i) )
1265	ENDDO
1266	!
1267	!-- Natural surfaces
1268	DO m = 1, surf_lsm_h%ns
1269	i = surf_lsm_h%i(m)
1270	j = surf_lsm_h%j(m)
1271	k = surf_lsm_h%k(m)
1272	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) &
1273	surf_lsm_h%shf(m) = cthf * exp( -ext_coef * cum_lai_hf(0,j,i) )
1274	ENDDO
1275	!
1276	!-- Urban surfaces
1277	DO m = 1, surf_usm_h%ns
1278	i = surf_usm_h%i(m)
1279	j = surf_usm_h%j(m)
1280	k = surf_usm_h%k(m)
1281	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) &
1282	surf_usm_h%shf(m) = cthf * exp( -ext_coef * cum_lai_hf(0,j,i) )
1283	ENDDO
1284	!
1285	!
1286	!-- Calculation of the heating rate (K/s) within the different layers of
1287	!-- the plant canopy. Calculation is only necessary in areas covered with
1288	!-- canopy.
1289	!-- Within the different canopy layers the plant-canopy heating
1290	!-- rate (pc_heating_rate) is calculated as the vertical
1291	!-- divergence of the canopy heat fluxes at the top and bottom
1292	!-- of the respective layer
1293	DO i = nxlg, nxrg
1294	DO j = nysg, nyng
1295	DO k = 1, pch_index_ji(j,i)
1296	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) THEN
1297	pc_heating_rate(k,j,i) = cthf * &
1298	( exp(-ext_coef*cum_lai_hf(k,j,i)) - &
1299	exp(-ext_coef*cum_lai_hf(k-1,j,i) ) ) / dzw(k)
1300	ENDIF
1301	ENDDO
1302	ENDDO
1303	ENDDO
1304
1305	ENDIF
1306
1307	IF ( debug_output ) CALL debug_message( 'pcm_init', 'end' )
1308
1309
1310	END SUBROUTINE pcm_init
1311
1312
1313	!------------------------------------------------------------------------------!
1314	! Description:
1315	! ------------
1316	!> Parin for &plant_canopy_parameters for plant canopy model
1317	!------------------------------------------------------------------------------!
1318	SUBROUTINE pcm_parin
1319
1320	USE control_parameters, &
1321	ONLY: message_string, plant_canopy
1322
1323	IMPLICIT NONE
1324
1325	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
1326
1327	NAMELIST /plant_canopy_parameters/ &
1328	alpha_lad, beta_lad, canopy_drag_coeff, &
1329	canopy_mode, cthf, &
1330	lad_surface, lad_type_coef, &
1331	lad_vertical_gradient, &
1332	lad_vertical_gradient_level, &
1333	lai_beta, &
1334	leaf_scalar_exch_coeff, &
1335	leaf_surface_conc, pch_index, &
1336	plant_canopy_transpiration
1337
1338	NAMELIST /canopy_par/ alpha_lad, beta_lad, canopy_drag_coeff, &
1339	canopy_mode, cthf, &
1340	lad_surface, lad_type_coef, &
1341	lad_vertical_gradient, &
1342	lad_vertical_gradient_level, &
1343	lai_beta, &
1344	leaf_scalar_exch_coeff, &
1345	leaf_surface_conc, pch_index, &
1346	plant_canopy_transpiration
1347
1348	line = ' '
1349
1350	!
1351	!-- Try to find plant-canopy model package
1352	REWIND ( 11 )
1353	line = ' '
1354	DO WHILE ( INDEX( line, '&plant_canopy_parameters' ) == 0 )
1355	READ ( 11, '(A)', END=12 ) line
1356	ENDDO
1357	BACKSPACE ( 11 )
1358
1359	!
1360	!-- Read user-defined namelist
1361	READ ( 11, plant_canopy_parameters, ERR = 10 )
1362
1363	!
1364	!-- Set flag that indicates that the plant-canopy model is switched on
1365	plant_canopy = .TRUE.
1366
1367	GOTO 14
1368
1369	10 BACKSPACE( 11 )
1370	READ( 11 , '(A)') line
1371	CALL parin_fail_message( 'plant_canopy_parameters', line )
1372	!
1373	!-- Try to find old namelist
1374	12 REWIND ( 11 )
1375	line = ' '
1376	DO WHILE ( INDEX( line, '&canopy_par' ) == 0 )
1377	READ ( 11, '(A)', END=14 ) line
1378	ENDDO
1379	BACKSPACE ( 11 )
1380
1381	!
1382	!-- Read user-defined namelist
1383	READ ( 11, canopy_par, ERR = 13, END = 14 )
1384
1385	message_string = 'namelist canopy_par is deprecated and will be ' // &
1386	'removed in near future. Please use namelist ' // &
1387	'plant_canopy_parameters instead'
1388	CALL message( 'pcm_parin', 'PA0487', 0, 1, 0, 6, 0 )
1389
1390	!
1391	!-- Set flag that indicates that the plant-canopy model is switched on
1392	plant_canopy = .TRUE.
1393
1394	GOTO 14
1395
1396	13 BACKSPACE( 11 )
1397	READ( 11 , '(A)') line
1398	CALL parin_fail_message( 'canopy_par', line )
1399
1400	14 CONTINUE
1401
1402
1403	END SUBROUTINE pcm_parin
1404
1405
1406
1407	!------------------------------------------------------------------------------!
1408	! Description:
1409	! ------------
1410	!
1411	!> Loads 3D plant canopy data from file. File format is as follows:
1412	!>
1413	!> num_levels
1414	!> dtype,x,y,pctype,value(nzb),value(nzb+1), ... ,value(nzb+num_levels-1)
1415	!> dtype,x,y,pctype,value(nzb),value(nzb+1), ... ,value(nzb+num_levels-1)
1416	!> dtype,x,y,pctype,value(nzb),value(nzb+1), ... ,value(nzb+num_levels-1)
1417	!> ...
1418	!>
1419	!> i.e. first line determines number of levels and further lines represent plant
1420	!> canopy data, one line per column and variable. In each data line,
1421	!> dtype represents variable to be set:
1422	!>
1423	!> dtype=1: leaf area density (lad_s)
1424	!> dtype=2....n: some additional plant canopy input data quantity
1425	!>
1426	!> Zeros are added automatically above num_levels until top of domain. Any
1427	!> non-specified (x,y) columns have zero values as default.
1428	!------------------------------------------------------------------------------!
1429	SUBROUTINE pcm_read_plant_canopy_3d
1430
1431	USE control_parameters, &
1432	ONLY: coupling_char, message_string
1433
1434	USE indices, &
1435	ONLY: nbgp
1436
1437	IMPLICIT NONE
1438
1439	INTEGER(iwp) :: dtype !< type of input data (1=lad)
1440	INTEGER(iwp) :: pctype !< type of plant canopy (deciduous,non-deciduous,...)
1441	INTEGER(iwp) :: i, j !< running index
1442	INTEGER(iwp) :: nzp !< number of vertical layers of plant canopy
1443	INTEGER(iwp) :: nzpltop !<
1444	INTEGER(iwp) :: nzpl !<
1445	INTEGER(iwp) :: kk !<
1446
1447	REAL(wp), DIMENSION(:), ALLOCATABLE :: col !< vertical column of input data
1448
1449	!
1450	!-- Initialize lad_s array
1451	lad_s = 0.0_wp
1452
1453	!
1454	!-- Open and read plant canopy input data
1455	OPEN(152, FILE='PLANT_CANOPY_DATA_3D' // TRIM( coupling_char ), &
1456	ACCESS='SEQUENTIAL', ACTION='READ', STATUS='OLD', &
1457	FORM='FORMATTED', ERR=515)
1458	READ(152, *, ERR=516, END=517) nzp !< read first line = number of vertical layers
1459	nzpltop = MIN(nzt+1, nzb+nzp-1)
1460	nzpl = nzpltop - nzb + 1 !< no. of layers to assign
1461	ALLOCATE( col(0:nzp-1) )
1462
1463	DO
1464	READ(152, *, ERR=516, END=517) dtype, i, j, pctype, col(:)
1465	IF ( i < nxlg .OR. i > nxrg .OR. j < nysg .OR. j > nyng ) CYCLE
1466
1467	SELECT CASE (dtype)
1468	CASE( 1 ) !< leaf area density
1469	!
1470	!-- This is just the pure canopy layer assumed to be grounded to
1471	!-- a flat domain surface. At locations where plant canopy sits
1472	!-- on top of any kind of topography, the vertical plant column
1473	!-- must be "lifted", which is done in SUBROUTINE pcm_tendency.
1474	IF ( pctype < 0 .OR. pctype > 10 ) THEN !< incorrect plant canopy type
1475	WRITE( message_string, * ) 'Incorrect type of plant canopy. ' // &
1476	'Allowed values 0 <= pctype <= 10, ' // &
1477	'but pctype is ', pctype
1478	CALL message( 'pcm_read_plant_canopy_3d', 'PA0349', 1, 2, 0, 6, 0 )
1479	ENDIF
1480	kk = topo_top_ind(j,i,0)
1481	lad_s(nzb:nzpltop-kk, j, i) = col(kk:nzpl-1)*lad_type_coef(pctype)
1482	CASE DEFAULT
1483	WRITE(message_string, '(a,i2,a)') &
1484	'Unknown record type in file PLANT_CANOPY_DATA_3D: "', dtype, '"'
1485	CALL message( 'pcm_read_plant_canopy_3d', 'PA0530', 1, 2, 0, 6, 0 )
1486	END SELECT
1487	ENDDO
1488
1489	515 message_string = 'error opening file PLANT_CANOPY_DATA_3D'
1490	CALL message( 'pcm_read_plant_canopy_3d', 'PA0531', 1, 2, 0, 6, 0 )
1491
1492	516 message_string = 'error reading file PLANT_CANOPY_DATA_3D'
1493	CALL message( 'pcm_read_plant_canopy_3d', 'PA0532', 1, 2, 0, 6, 0 )
1494
1495	517 CLOSE(152)
1496	DEALLOCATE( col )
1497
1498	CALL exchange_horiz( lad_s, nbgp )
1499
1500	END SUBROUTINE pcm_read_plant_canopy_3d
1501
1502
1503
1504	!------------------------------------------------------------------------------!
1505	! Description:
1506	! ------------
1507	!> Calculation of the tendency terms, accounting for the effect of the plant
1508	!> canopy on momentum and scalar quantities.
1509	!>
1510	!> The canopy is located where the leaf area density lad_s(k,j,i) > 0.0
1511	!> (defined on scalar grid), as initialized in subroutine pcm_init.
1512	!> The lad on the w-grid is vertically interpolated from the surrounding
1513	!> lad_s. The upper boundary of the canopy is defined on the w-grid at
1514	!> k = pch_index. Here, the lad is zero.
1515	!>
1516	!> The canopy drag must be limited (previously accounted for by calculation of
1517	!> a limiting canopy timestep for the determination of the maximum LES timestep
1518	!> in subroutine timestep), since it is physically impossible that the canopy
1519	!> drag alone can locally change the sign of a velocity component. This
1520	!> limitation is realized by calculating preliminary tendencies and velocities.
1521	!> It is subsequently checked if the preliminary new velocity has a different
1522	!> sign than the current velocity. If so, the tendency is limited in a way that
1523	!> the velocity can at maximum be reduced to zero by the canopy drag.
1524	!>
1525	!>
1526	!> Call for all grid points
1527	!------------------------------------------------------------------------------!
1528	SUBROUTINE pcm_tendency( component )
1529
1530
1531	USE control_parameters, &
1532	ONLY: dt_3d, message_string
1533
1534	USE kinds
1535
1536	IMPLICIT NONE
1537
1538	INTEGER(iwp) :: component !< prognostic variable (u,v,w,pt,q,e)
1539	INTEGER(iwp) :: i !< running index
1540	INTEGER(iwp) :: j !< running index
1541	INTEGER(iwp) :: k !< running index
1542	INTEGER(iwp) :: k_wall !< vertical index of topography top
1543	INTEGER(iwp) :: kk !< running index for flat lad arrays
1544
1545	REAL(wp) :: ddt_3d !< inverse of the LES timestep (dt_3d)
1546	REAL(wp) :: lad_local !< local lad value
1547	REAL(wp) :: pre_tend !< preliminary tendency
1548	REAL(wp) :: pre_u !< preliminary u-value
1549	REAL(wp) :: pre_v !< preliminary v-value
1550	REAL(wp) :: pre_w !< preliminary w-value
1551
1552
1553	ddt_3d = 1.0_wp / dt_3d
1554
1555	!
1556	!-- Compute drag for the three velocity components and the SGS-TKE:
1557	SELECT CASE ( component )
1558
1559	!
1560	!-- u-component
1561	CASE ( 1 )
1562	DO i = nxlu, nxr
1563	DO j = nys, nyn
1564	!
1565	!-- Determine topography-top index on u-grid
1566	k_wall = topo_top_ind(j,i,1)
1567	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1568
1569	kk = k - k_wall !- lad arrays are defined flat
1570	!
1571	!-- In order to create sharp boundaries of the plant canopy,
1572	!-- the lad on the u-grid at index (k,j,i) is equal to
1573	!-- lad_s(k,j,i), rather than being interpolated from the
1574	!-- surrounding lad_s, because this would yield smaller lad
1575	!-- at the canopy boundaries than inside of the canopy.
1576	!-- For the same reason, the lad at the rightmost(i+1)canopy
1577	!-- boundary on the u-grid equals lad_s(k,j,i).
1578	lad_local = lad_s(kk,j,i)
1579	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j,i-1) > 0.0_wp )&
1580	THEN
1581	lad_local = lad_s(kk,j,i-1)
1582	ENDIF
1583
1584	pre_tend = 0.0_wp
1585	pre_u = 0.0_wp
1586	!
1587	!-- Calculate preliminary value (pre_tend) of the tendency
1588	pre_tend = - cdc * &
1589	lad_local * &
1590	SQRT( u(k,j,i)**2 + &
1591	( 0.25_wp * ( v(k,j,i-1) + &
1592	v(k,j,i) + &
1593	v(k,j+1,i) + &
1594	v(k,j+1,i-1) ) &
1595	)**2 + &
1596	( 0.25_wp * ( w(k-1,j,i-1) + &
1597	w(k-1,j,i) + &
1598	w(k,j,i-1) + &
1599	w(k,j,i) ) &
1600	)**2 &
1601	) * &
1602	u(k,j,i)
1603
1604	!
1605	!-- Calculate preliminary new velocity, based on pre_tend
1606	pre_u = u(k,j,i) + dt_3d * pre_tend
1607	!
1608	!-- Compare sign of old velocity and new preliminary velocity,
1609	!-- and in case the signs are different, limit the tendency
1610	IF ( SIGN(pre_u,u(k,j,i)) /= pre_u ) THEN
1611	pre_tend = - u(k,j,i) * ddt_3d
1612	ELSE
1613	pre_tend = pre_tend
1614	ENDIF
1615	!
1616	!-- Calculate final tendency
1617	tend(k,j,i) = tend(k,j,i) + pre_tend
1618
1619	ENDDO
1620	ENDDO
1621	ENDDO
1622
1623	!
1624	!-- v-component
1625	CASE ( 2 )
1626	DO i = nxl, nxr
1627	DO j = nysv, nyn
1628	!
1629	!-- Determine topography-top index on v-grid
1630	k_wall = topo_top_ind(j,i,2)
1631
1632	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1633
1634	kk = k - k_wall !- lad arrays are defined flat
1635	!
1636	!-- In order to create sharp boundaries of the plant canopy,
1637	!-- the lad on the v-grid at index (k,j,i) is equal to
1638	!-- lad_s(k,j,i), rather than being interpolated from the
1639	!-- surrounding lad_s, because this would yield smaller lad
1640	!-- at the canopy boundaries than inside of the canopy.
1641	!-- For the same reason, the lad at the northmost(j+1) canopy
1642	!-- boundary on the v-grid equals lad_s(k,j,i).
1643	lad_local = lad_s(kk,j,i)
1644	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j-1,i) > 0.0_wp )&
1645	THEN
1646	lad_local = lad_s(kk,j-1,i)
1647	ENDIF
1648
1649	pre_tend = 0.0_wp
1650	pre_v = 0.0_wp
1651	!
1652	!-- Calculate preliminary value (pre_tend) of the tendency
1653	pre_tend = - cdc * &
1654	lad_local * &
1655	SQRT( ( 0.25_wp * ( u(k,j-1,i) + &
1656	u(k,j-1,i+1) + &
1657	u(k,j,i) + &
1658	u(k,j,i+1) ) &
1659	)**2 + &
1660	v(k,j,i)**2 + &
1661	( 0.25_wp * ( w(k-1,j-1,i) + &
1662	w(k-1,j,i) + &
1663	w(k,j-1,i) + &
1664	w(k,j,i) ) &
1665	)**2 &
1666	) * &
1667	v(k,j,i)
1668
1669	!
1670	!-- Calculate preliminary new velocity, based on pre_tend
1671	pre_v = v(k,j,i) + dt_3d * pre_tend
1672	!
1673	!-- Compare sign of old velocity and new preliminary velocity,
1674	!-- and in case the signs are different, limit the tendency
1675	IF ( SIGN(pre_v,v(k,j,i)) /= pre_v ) THEN
1676	pre_tend = - v(k,j,i) * ddt_3d
1677	ELSE
1678	pre_tend = pre_tend
1679	ENDIF
1680	!
1681	!-- Calculate final tendency
1682	tend(k,j,i) = tend(k,j,i) + pre_tend
1683
1684	ENDDO
1685	ENDDO
1686	ENDDO
1687
1688	!
1689	!-- w-component
1690	CASE ( 3 )
1691	DO i = nxl, nxr
1692	DO j = nys, nyn
1693	!
1694	!-- Determine topography-top index on w-grid
1695	k_wall = topo_top_ind(j,i,3)
1696
1697	DO k = k_wall+1, k_wall + pch_index_ji(j,i) - 1
1698
1699	kk = k - k_wall !- lad arrays are defined flat
1700
1701	pre_tend = 0.0_wp
1702	pre_w = 0.0_wp
1703	!
1704	!-- Calculate preliminary value (pre_tend) of the tendency
1705	pre_tend = - cdc * &
1706	(0.5_wp * &
1707	( lad_s(kk+1,j,i) + lad_s(kk,j,i) )) * &
1708	SQRT( ( 0.25_wp * ( u(k,j,i) + &
1709	u(k,j,i+1) + &
1710	u(k+1,j,i) + &
1711	u(k+1,j,i+1) ) &
1712	)**2 + &
1713	( 0.25_wp * ( v(k,j,i) + &
1714	v(k,j+1,i) + &
1715	v(k+1,j,i) + &
1716	v(k+1,j+1,i) ) &
1717	)**2 + &
1718	w(k,j,i)**2 &
1719	) * &
1720	w(k,j,i)
1721	!
1722	!-- Calculate preliminary new velocity, based on pre_tend
1723	pre_w = w(k,j,i) + dt_3d * pre_tend
1724	!
1725	!-- Compare sign of old velocity and new preliminary velocity,
1726	!-- and in case the signs are different, limit the tendency
1727	IF ( SIGN(pre_w,w(k,j,i)) /= pre_w ) THEN
1728	pre_tend = - w(k,j,i) * ddt_3d
1729	ELSE
1730	pre_tend = pre_tend
1731	ENDIF
1732	!
1733	!-- Calculate final tendency
1734	tend(k,j,i) = tend(k,j,i) + pre_tend
1735
1736	ENDDO
1737	ENDDO
1738	ENDDO
1739
1740	!
1741	!-- potential temperature
1742	CASE ( 4 )
1743	IF ( humidity ) THEN
1744	DO i = nxl, nxr
1745	DO j = nys, nyn
1746	!-- Determine topography-top index on scalar-grid
1747	k_wall = topo_top_ind(j,i,0)
1748	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1749	kk = k - k_wall !- lad arrays are defined flat
1750	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i) - pc_latent_rate(kk,j,i)
1751	ENDDO
1752	ENDDO
1753	ENDDO
1754	ELSE
1755	DO i = nxl, nxr
1756	DO j = nys, nyn
1757	!-- Determine topography-top index on scalar-grid
1758	k_wall = topo_top_ind(j,i,0)
1759	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1760	kk = k - k_wall !- lad arrays are defined flat
1761	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i)
1762	ENDDO
1763	ENDDO
1764	ENDDO
1765	ENDIF
1766
1767	!
1768	!-- humidity
1769	CASE ( 5 )
1770	DO i = nxl, nxr
1771	DO j = nys, nyn
1772	!
1773	!-- Determine topography-top index on scalar-grid
1774	k_wall = topo_top_ind(j,i,0)
1775
1776	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1777
1778	kk = k - k_wall !- lad arrays are defined flat
1779
1780	IF ( .NOT. plant_canopy_transpiration ) THEN
1781	! pc_transpiration_rate is calculated in radiation model
1782	! in case of plant_canopy_transpiration = .T.
1783	! to include also the dependecy to the radiation
1784	! in the plant canopy box
1785	pc_transpiration_rate(kk,j,i) = - lsec &
1786	* lad_s(kk,j,i) * &
1787	SQRT( ( 0.5_wp * ( u(k,j,i) + &
1788	u(k,j,i+1) ) &
1789	)**2 + &
1790	( 0.5_wp * ( v(k,j,i) + &
1791	v(k,j+1,i) ) &
1792	)**2 + &
1793	( 0.5_wp * ( w(k-1,j,i) + &
1794	w(k,j,i) ) &
1795	)**2 &
1796	) * &
1797	( q(k,j,i) - lsc )
1798	ENDIF
1799
1800	tend(k,j,i) = tend(k,j,i) + pc_transpiration_rate(kk,j,i)
1801	ENDDO
1802	ENDDO
1803	ENDDO
1804
1805	!
1806	!-- sgs-tke
1807	CASE ( 6 )
1808	DO i = nxl, nxr
1809	DO j = nys, nyn
1810	!
1811	!-- Determine topography-top index on scalar-grid
1812	k_wall = topo_top_ind(j,i,0)
1813
1814	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1815
1816	kk = k - k_wall !- lad arrays are defined flat
1817	tend(k,j,i) = tend(k,j,i) - &
1818	2.0_wp * cdc * &
1819	lad_s(kk,j,i) * &
1820	SQRT( ( 0.5_wp * ( u(k,j,i) + &
1821	u(k,j,i+1) ) &
1822	)**2 + &
1823	( 0.5_wp * ( v(k,j,i) + &
1824	v(k,j+1,i) ) &
1825	)**2 + &
1826	( 0.5_wp * ( w(k,j,i) + &
1827	w(k+1,j,i) ) &
1828	)**2 &
1829	) * &
1830	e(k,j,i)
1831	ENDDO
1832	ENDDO
1833	ENDDO
1834	!
1835	!-- scalar concentration
1836	CASE ( 7 )
1837	DO i = nxl, nxr
1838	DO j = nys, nyn
1839	!
1840	!-- Determine topography-top index on scalar-grid
1841	k_wall = topo_top_ind(j,i,0)
1842
1843	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1844
1845	kk = k - k_wall !- lad arrays are defined flat
1846	tend(k,j,i) = tend(k,j,i) - &
1847	lsec * &
1848	lad_s(kk,j,i) * &
1849	SQRT( ( 0.5_wp * ( u(k,j,i) + &
1850	u(k,j,i+1) ) &
1851	)**2 + &
1852	( 0.5_wp * ( v(k,j,i) + &
1853	v(k,j+1,i) ) &
1854	)**2 + &
1855	( 0.5_wp * ( w(k-1,j,i) + &
1856	w(k,j,i) ) &
1857	)**2 &
1858	) * &
1859	( s(k,j,i) - lsc )
1860	ENDDO
1861	ENDDO
1862	ENDDO
1863
1864
1865
1866	CASE DEFAULT
1867
1868	WRITE( message_string, * ) 'wrong component: ', component
1869	CALL message( 'pcm_tendency', 'PA0279', 1, 2, 0, 6, 0 )
1870
1871	END SELECT
1872
1873	END SUBROUTINE pcm_tendency
1874
1875
1876	!------------------------------------------------------------------------------!
1877	! Description:
1878	! ------------
1879	!> Calculation of the tendency terms, accounting for the effect of the plant
1880	!> canopy on momentum and scalar quantities.
1881	!>
1882	!> The canopy is located where the leaf area density lad_s(k,j,i) > 0.0
1883	!> (defined on scalar grid), as initialized in subroutine pcm_init.
1884	!> The lad on the w-grid is vertically interpolated from the surrounding
1885	!> lad_s. The upper boundary of the canopy is defined on the w-grid at
1886	!> k = pch_index. Here, the lad is zero.
1887	!>
1888	!> The canopy drag must be limited (previously accounted for by calculation of
1889	!> a limiting canopy timestep for the determination of the maximum LES timestep
1890	!> in subroutine timestep), since it is physically impossible that the canopy
1891	!> drag alone can locally change the sign of a velocity component. This
1892	!> limitation is realized by calculating preliminary tendencies and velocities.
1893	!> It is subsequently checked if the preliminary new velocity has a different
1894	!> sign than the current velocity. If so, the tendency is limited in a way that
1895	!> the velocity can at maximum be reduced to zero by the canopy drag.
1896	!>
1897	!>
1898	!> Call for grid point i,j
1899	!------------------------------------------------------------------------------!
1900	SUBROUTINE pcm_tendency_ij( i, j, component )
1901
1902
1903	USE control_parameters, &
1904	ONLY: dt_3d, message_string
1905
1906	USE kinds
1907
1908	IMPLICIT NONE
1909
1910	INTEGER(iwp) :: component !< prognostic variable (u,v,w,pt,q,e)
1911	INTEGER(iwp) :: i !< running index
1912	INTEGER(iwp) :: j !< running index
1913	INTEGER(iwp) :: k !< running index
1914	INTEGER(iwp) :: k_wall !< vertical index of topography top
1915	INTEGER(iwp) :: kk !< running index for flat lad arrays
1916
1917	REAL(wp) :: ddt_3d !< inverse of the LES timestep (dt_3d)
1918	REAL(wp) :: lad_local !< local lad value
1919	REAL(wp) :: pre_tend !< preliminary tendency
1920	REAL(wp) :: pre_u !< preliminary u-value
1921	REAL(wp) :: pre_v !< preliminary v-value
1922	REAL(wp) :: pre_w !< preliminary w-value
1923
1924
1925	ddt_3d = 1.0_wp / dt_3d
1926	!
1927	!-- Compute drag for the three velocity components and the SGS-TKE
1928	SELECT CASE ( component )
1929
1930	!
1931	!-- u-component
1932	CASE ( 1 )
1933	!
1934	!-- Determine topography-top index on u-grid
1935	k_wall = topo_top_ind(j,i,1)
1936	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
1937
1938	kk = k - k_wall !- lad arrays are defined flat
1939
1940	!
1941	!-- In order to create sharp boundaries of the plant canopy,
1942	!-- the lad on the u-grid at index (k,j,i) is equal to lad_s(k,j,i),
1943	!-- rather than being interpolated from the surrounding lad_s,
1944	!-- because this would yield smaller lad at the canopy boundaries
1945	!-- than inside of the canopy.
1946	!-- For the same reason, the lad at the rightmost(i+1)canopy
1947	!-- boundary on the u-grid equals lad_s(k,j,i).
1948	lad_local = lad_s(kk,j,i)
1949	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j,i-1) > 0.0_wp ) THEN
1950	lad_local = lad_s(kk,j,i-1)
1951	ENDIF
1952
1953	pre_tend = 0.0_wp
1954	pre_u = 0.0_wp
1955	!
1956	!-- Calculate preliminary value (pre_tend) of the tendency
1957	pre_tend = - cdc * &
1958	lad_local * &
1959	SQRT( u(k,j,i)**2 + &
1960	( 0.25_wp * ( v(k,j,i-1) + &
1961	v(k,j,i) + &
1962	v(k,j+1,i) + &
1963	v(k,j+1,i-1) ) &
1964	)**2 + &
1965	( 0.25_wp * ( w(k-1,j,i-1) + &
1966	w(k-1,j,i) + &
1967	w(k,j,i-1) + &
1968	w(k,j,i) ) &
1969	)**2 &
1970	) * &
1971	u(k,j,i)
1972
1973	!
1974	!-- Calculate preliminary new velocity, based on pre_tend
1975	pre_u = u(k,j,i) + dt_3d * pre_tend
1976	!
1977	!-- Compare sign of old velocity and new preliminary velocity,
1978	!-- and in case the signs are different, limit the tendency
1979	IF ( SIGN(pre_u,u(k,j,i)) /= pre_u ) THEN
1980	pre_tend = - u(k,j,i) * ddt_3d
1981	ELSE
1982	pre_tend = pre_tend
1983	ENDIF
1984	!
1985	!-- Calculate final tendency
1986	tend(k,j,i) = tend(k,j,i) + pre_tend
1987	ENDDO
1988
1989
1990	!
1991	!-- v-component
1992	CASE ( 2 )
1993	!
1994	!-- Determine topography-top index on v-grid
1995	k_wall = topo_top_ind(j,i,2)
1996
1997	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
1998
1999	kk = k - k_wall !- lad arrays are defined flat
2000	!
2001	!-- In order to create sharp boundaries of the plant canopy,
2002	!-- the lad on the v-grid at index (k,j,i) is equal to lad_s(k,j,i),
2003	!-- rather than being interpolated from the surrounding lad_s,
2004	!-- because this would yield smaller lad at the canopy boundaries
2005	!-- than inside of the canopy.
2006	!-- For the same reason, the lad at the northmost(j+1)canopy
2007	!-- boundary on the v-grid equals lad_s(k,j,i).
2008	lad_local = lad_s(kk,j,i)
2009	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j-1,i) > 0.0_wp ) THEN
2010	lad_local = lad_s(kk,j-1,i)
2011	ENDIF
2012
2013	pre_tend = 0.0_wp
2014	pre_v = 0.0_wp
2015	!
2016	!-- Calculate preliminary value (pre_tend) of the tendency
2017	pre_tend = - cdc * &
2018	lad_local * &
2019	SQRT( ( 0.25_wp * ( u(k,j-1,i) + &
2020	u(k,j-1,i+1) + &
2021	u(k,j,i) + &
2022	u(k,j,i+1) ) &
2023	)**2 + &
2024	v(k,j,i)**2 + &
2025	( 0.25_wp * ( w(k-1,j-1,i) + &
2026	w(k-1,j,i) + &
2027	w(k,j-1,i) + &
2028	w(k,j,i) ) &
2029	)**2 &
2030	) * &
2031	v(k,j,i)
2032
2033	!
2034	!-- Calculate preliminary new velocity, based on pre_tend
2035	pre_v = v(k,j,i) + dt_3d * pre_tend
2036	!
2037	!-- Compare sign of old velocity and new preliminary velocity,
2038	!-- and in case the signs are different, limit the tendency
2039	IF ( SIGN(pre_v,v(k,j,i)) /= pre_v ) THEN
2040	pre_tend = - v(k,j,i) * ddt_3d
2041	ELSE
2042	pre_tend = pre_tend
2043	ENDIF
2044	!
2045	!-- Calculate final tendency
2046	tend(k,j,i) = tend(k,j,i) + pre_tend
2047	ENDDO
2048
2049
2050	!
2051	!-- w-component
2052	CASE ( 3 )
2053	!
2054	!-- Determine topography-top index on w-grid
2055	k_wall = topo_top_ind(j,i,3)
2056
2057	DO k = k_wall + 1, k_wall + pch_index_ji(j,i) - 1
2058
2059	kk = k - k_wall !- lad arrays are defined flat
2060
2061	pre_tend = 0.0_wp
2062	pre_w = 0.0_wp
2063	!
2064	!-- Calculate preliminary value (pre_tend) of the tendency
2065	pre_tend = - cdc * &
2066	(0.5_wp * &
2067	( lad_s(kk+1,j,i) + lad_s(kk,j,i) )) * &
2068	SQRT( ( 0.25_wp * ( u(k,j,i) + &
2069	u(k,j,i+1) + &
2070	u(k+1,j,i) + &
2071	u(k+1,j,i+1) ) &
2072	)**2 + &
2073	( 0.25_wp * ( v(k,j,i) + &
2074	v(k,j+1,i) + &
2075	v(k+1,j,i) + &
2076	v(k+1,j+1,i) ) &
2077	)**2 + &
2078	w(k,j,i)**2 &
2079	) * &
2080	w(k,j,i)
2081	!
2082	!-- Calculate preliminary new velocity, based on pre_tend
2083	pre_w = w(k,j,i) + dt_3d * pre_tend
2084	!
2085	!-- Compare sign of old velocity and new preliminary velocity,
2086	!-- and in case the signs are different, limit the tendency
2087	IF ( SIGN(pre_w,w(k,j,i)) /= pre_w ) THEN
2088	pre_tend = - w(k,j,i) * ddt_3d
2089	ELSE
2090	pre_tend = pre_tend
2091	ENDIF
2092	!
2093	!-- Calculate final tendency
2094	tend(k,j,i) = tend(k,j,i) + pre_tend
2095	ENDDO
2096
2097	!
2098	!-- potential temperature
2099	CASE ( 4 )
2100	!
2101	!-- Determine topography-top index on scalar grid
2102	k_wall = topo_top_ind(j,i,0)
2103
2104	IF ( humidity ) THEN
2105	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2106	kk = k - k_wall !- lad arrays are defined flat
2107	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i) - &
2108	pc_latent_rate(kk,j,i)
2109	ENDDO
2110	ELSE
2111	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2112	kk = k - k_wall !- lad arrays are defined flat
2113	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i)
2114	ENDDO
2115	ENDIF
2116
2117	!
2118	!-- humidity
2119	CASE ( 5 )
2120	!
2121	!-- Determine topography-top index on scalar grid
2122	k_wall = topo_top_ind(j,i,0)
2123
2124	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2125	kk = k - k_wall !- lad arrays are defined flat
2126	IF ( .NOT. plant_canopy_transpiration ) THEN
2127	! pc_transpiration_rate is calculated in radiation model
2128	! in case of plant_canopy_transpiration = .T.
2129	! to include also the dependecy to the radiation
2130	! in the plant canopy box
2131	pc_transpiration_rate(kk,j,i) = - lsec &
2132	* lad_s(kk,j,i) * &
2133	SQRT( ( 0.5_wp * ( u(k,j,i) + &
2134	u(k,j,i+1) ) &
2135	)**2 + &
2136	( 0.5_wp * ( v(k,j,i) + &
2137	v(k,j+1,i) ) &
2138	)**2 + &
2139	( 0.5_wp * ( w(k-1,j,i) + &
2140	w(k,j,i) ) &
2141	)**2 &
2142	) * &
2143	( q(k,j,i) - lsc )
2144	ENDIF
2145
2146	tend(k,j,i) = tend(k,j,i) + pc_transpiration_rate(kk,j,i)
2147
2148	ENDDO
2149
2150	!
2151	!-- sgs-tke
2152	CASE ( 6 )
2153	!
2154	!-- Determine topography-top index on scalar grid
2155	k_wall = topo_top_ind(j,i,0)
2156
2157	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2158
2159	kk = k - k_wall
2160	tend(k,j,i) = tend(k,j,i) - &
2161	2.0_wp * cdc * &
2162	lad_s(kk,j,i) * &
2163	SQRT( ( 0.5_wp * ( u(k,j,i) + &
2164	u(k,j,i+1) ) &
2165	)**2 + &
2166	( 0.5_wp * ( v(k,j,i) + &
2167	v(k,j+1,i) ) &
2168	)**2 + &
2169	( 0.5_wp * ( w(k,j,i) + &
2170	w(k+1,j,i) ) &
2171	)**2 &
2172	) * &
2173	e(k,j,i)
2174	ENDDO
2175
2176	!
2177	!-- scalar concentration
2178	CASE ( 7 )
2179	!
2180	!-- Determine topography-top index on scalar grid
2181	k_wall = topo_top_ind(j,i,0)
2182
2183	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2184
2185	kk = k - k_wall
2186	tend(k,j,i) = tend(k,j,i) - &
2187	lsec * &
2188	lad_s(kk,j,i) * &
2189	SQRT( ( 0.5_wp * ( u(k,j,i) + &
2190	u(k,j,i+1) ) &
2191	)**2 + &
2192	( 0.5_wp * ( v(k,j,i) + &
2193	v(k,j+1,i) ) &
2194	)**2 + &
2195	( 0.5_wp * ( w(k-1,j,i) + &
2196	w(k,j,i) ) &
2197	)**2 &
2198	) * &
2199	( s(k,j,i) - lsc )
2200	ENDDO
2201
2202	CASE DEFAULT
2203
2204	WRITE( message_string, * ) 'wrong component: ', component
2205	CALL message( 'pcm_tendency', 'PA0279', 1, 2, 0, 6, 0 )
2206
2207	END SELECT
2208
2209	END SUBROUTINE pcm_tendency_ij
2210
2211
2212
2213	END MODULE plant_canopy_model_mod

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