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source: palm/trunk/SOURCE/plant_canopy_model_mod.f90 @ 3806

Last change on this file since 3806 was 3761, checked in by raasch, 6 years ago
unused variables removed, OpenACC directives re-formatted, statements added to avoid compiler warnings
Property svn:keywords set to `Id`
File size: 88.9 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 2018 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 3761 2019-02-25 15:31:42Z raasch $
29	! unsed variables removed
30	!
31	! 3745 2019-02-15 18:57:56Z suehring
32	! Bugfix in transpiration, floating invalid when temperature
33	! becomes > 40 degrees
34	!
35	! 3744 2019-02-15 18:38:58Z suehring
36	! Some interface calls moved to module_interface + cleanup
37	!
38	! 3655 2019-01-07 16:51:22Z knoop
39	! unused variables removed
40	!
41	! 3589 2018-11-30 15:09:51Z suehring
42	! Formatting adjustments
43	!
44	! 3582 2018-11-29 19:16:36Z suehring
45	! working precision added to make code Fortran 2008 conform
46	!
47	! 3498 2018-11-07 10:53:03Z gronemeier
48	! corrected revisions section
49	!
50	! 3497 2018-11-06 17:15:18Z suehring
51	! Remove write statement.
52	!
53	! 3467 2018-10-30 19:05:21Z suehring
54	! Add calculation of transpiration for resolved plant canopy (trees, shrubs)
55	! (V. Fuka, MFF UK Prague, J.Resler, ICS AS, Prague)
56	!
57	! Fix reading plant canopy over buildings
58	!
59	! 3337 2018-10-12 15:17:09Z kanani
60	! Fix reading plant canopy over buildings
61	!
62	! 3294 2018-10-01 02:37:10Z raasch
63	! ocean renamed ocean_mode
64	!
65	! 3274 2018-09-24 15:42:55Z knoop
66	! Modularization of all bulk cloud physics code components
67	!
68	! 3248 2018-09-14 09:42:06Z sward
69	! Minor formating changes
70	!
71	! 3246 2018-09-13 15:14:50Z sward
72	! Added error handling for input namelist via parin_fail_message
73	!
74	! 3241 2018-09-12 15:02:00Z raasch
75	! unused variables removed
76	!
77	! 3065 2018-06-12 07:03:02Z Giersch
78	! dz was replaced by the help of zw to allow for vertical stretching
79	!
80	! 3049 2018-05-29 13:52:36Z Giersch
81	! Error messages revised
82	!
83	! 3045 2018-05-28 07:55:41Z Giersch
84	! Error message revised
85	!
86	! 3022 2018-05-18 11:12:35Z suehring
87	! Bugfix in allocation of transpiration rate
88	!
89	! 3014 2018-05-09 08:42:38Z maronga
90	! Bugfix: nzb_do and nzt_do were not used for 3d data output
91	! Added pc_transpiration_rate
92	!
93	! 2977 2018-04-17 10:27:57Z kanani
94	! Implement changes from branch radiation (r2948-2971) with minor modifications,
95	! plus some formatting.
96	! (moh.hefny):
97	! Add plant canopy type to account for changes in LAD (based on the changes
98	! done by Resler & Pavel) and correct the error message to PALM Standard.
99	!
100	! 2932 2018-03-26 09:39:22Z maronga
101	! renamed canopy_par to plant_canopy_parameters
102	!
103	! 2920 2018-03-22 11:22:01Z kanani
104	! Move usm_lad_rma and prototype_lad to radiation_model (moh.hefny)
105	!
106	! 2892 2018-03-14 15:06:29Z suehring
107	! Bugfix, read separate ASCII LAD files for parent and child model.
108	!
109	! 2770 2018-01-25 15:10:09Z kanani
110	! Correction of parameter check
111	!
112	! 2768 2018-01-24 15:38:29Z kanani
113	! Added check for output quantity pcm_heatrate, some formatting
114	!
115	! 2766 2018-01-22 17:17:47Z kanani
116	! Increased LEN of canopy mode to 30
117	!
118	! 2746 2018-01-15 12:06:04Z suehring
119	! Move flag plant canopy to modules
120	!
121	! 2718 2018-01-02 08:49:38Z maronga
122	! Corrected "Former revisions" section
123	!
124	! 2701 2017-12-15 15:40:50Z suehring
125	! Changes from last commit documented
126	!
127	! 2698 2017-12-14 18:46:24Z suehring
128	! Bugfix in get_topography_top_index
129	!
130	! 2696 2017-12-14 17:12:51Z kanani
131	! Change in file header (GPL part)
132	! Bugfix for vertical loop index pch_index in case of Netcdf input
133	! Introduce 2D index array incorporate canopy top index
134	! Check if canopy on top of topography do not exceed vertical dimension
135	! Add check for canopy_mode in case of Netcdf input.
136	! Enable _FillValue output for 3d quantities
137	! Bugfix in reading of PIDS leaf area density (MS)
138	!
139	! 2669 2017-12-06 16:03:27Z raasch
140	! coupling_char removed
141	!
142	! 2512 2017-10-04 08:26:59Z raasch
143	! upper bounds of 3d output changed from nx+1,ny+1 to nx,ny
144	! no output of ghost layer data
145	!
146	! 2318 2017-07-20 17:27:44Z suehring
147	! Get topography top index via Function call
148	!
149	! 2317 2017-07-20 17:27:19Z suehring
150	! Changed error messages
151	!
152	! 2233 2017-05-30 18:08:54Z suehring
153	!
154	! 2232 2017-05-30 17:47:52Z suehring
155	! Adjustments to new topography concept
156	!
157	! 2213 2017-04-24 15:10:35Z kanani
158	! Bugfix: exchange of ghost points in array pc_heating_rate needed for output
159	! of pcm_heatrate, onetime ghost point exchange of lad_s after initialization.
160	! Formatting and clean-up of subroutine pcm_read_plant_canopy_3d,
161	! minor re-organization of canopy-heating initialization.
162	!
163	! 2209 2017-04-19 09:34:46Z kanani
164	! Added 3d output of leaf area density (pcm_lad) and canopy
165	! heat rate (pcm_heatrate)
166	!
167	! 2024 2016-10-12 16:42:37Z kanani
168	! Added missing lad_s initialization
169	!
170	! 2011 2016-09-19 17:29:57Z kanani
171	! Renamed canopy_heat_flux to pc_heating_rate, since the original meaning/
172	! calculation of the quantity has changed, related to the urban surface model
173	! and similar future applications.
174	!
175	! 2007 2016-08-24 15:47:17Z kanani
176	! Added SUBROUTINE pcm_read_plant_canopy_3d for reading 3d plant canopy data
177	! from file (new case canopy_mode=read_from_file_3d) in the course of
178	! introduction of urban surface model,
179	! introduced variable ext_coef,
180	! resorted SUBROUTINEs to alphabetical order
181	!
182	! 2000 2016-08-20 18:09:15Z knoop
183	! Forced header and separation lines into 80 columns
184	!
185	! 1960 2016-07-12 16:34:24Z suehring
186	! Separate humidity and passive scalar
187	!
188	! 1953 2016-06-21 09:28:42Z suehring
189	! Bugfix, lad_s and lad must be public
190	!
191	! 1826 2016-04-07 12:01:39Z maronga
192	! Further modularization
193	!
194	! 1721 2015-11-16 12:56:48Z raasch
195	! bugfixes: shf is reduced in areas covered with canopy only,
196	! canopy is set on top of topography
197	!
198	! 1682 2015-10-07 23:56:08Z knoop
199	! Code annotations made doxygen readable
200	!
201	! 1484 2014-10-21 10:53:05Z kanani
202	! Changes due to new module structure of the plant canopy model:
203	! module plant_canopy_model_mod now contains a subroutine for the
204	! initialization of the canopy model (pcm_init),
205	! limitation of the canopy drag (previously accounted for by calculation of
206	! a limiting canopy timestep for the determination of the maximum LES timestep
207	! in subroutine timestep) is now realized by the calculation of pre-tendencies
208	! and preliminary velocities in subroutine pcm_tendency,
209	! some redundant MPI communication removed in subroutine pcm_init
210	! (was previously in init_3d_model),
211	! unnecessary 3d-arrays lad_u, lad_v, lad_w removed - lad information on the
212	! respective grid is now provided only by lad_s (e.g. in the calculation of
213	! the tendency terms or of cum_lai_hf),
214	! drag_coefficient, lai, leaf_surface_concentration,
215	! scalar_exchange_coefficient, sec and sls renamed to canopy_drag_coeff,
216	! cum_lai_hf, leaf_surface_conc, leaf_scalar_exch_coeff, lsec and lsc,
217	! respectively,
218	! unnecessary 3d-arrays cdc, lsc and lsec now defined as single-value constants,
219	! USE-statements and ONLY-lists modified accordingly
220	!
221	! 1340 2014-03-25 19:45:13Z kanani
222	! REAL constants defined as wp-kind
223	!
224	! 1320 2014-03-20 08:40:49Z raasch
225	! ONLY-attribute added to USE-statements,
226	! kind-parameters added to all INTEGER and REAL declaration statements,
227	! kinds are defined in new module kinds,
228	! old module precision_kind is removed,
229	! revision history before 2012 removed,
230	! comment fields (!:) to be used for variable explanations added to
231	! all variable declaration statements
232	!
233	! 1036 2012-10-22 13:43:42Z raasch
234	! code put under GPL (PALM 3.9)
235	!
236	! 138 2007-11-28 10:03:58Z letzel
237	! Initial revision
238	!
239	! Description:
240	! ------------
241	!> 1) Initialization of the canopy model, e.g. construction of leaf area density
242	!> profile (subroutine pcm_init).
243	!> 2) Calculation of sinks and sources of momentum, heat and scalar concentration
244	!> due to canopy elements (subroutine pcm_tendency).
245	!
246	! @todo - precalculate constant terms in pcm_calc_transpiration_rate
247	!------------------------------------------------------------------------------!
248	MODULE plant_canopy_model_mod
249
250	USE arrays_3d, &
251	ONLY: dzu, dzw, e, exner, hyp, pt, q, s, tend, u, v, w, zu, zw
252
253	USE basic_constants_and_equations_mod, &
254	ONLY: c_p, degc_to_k, l_v, lv_d_cp, r_d, rd_d_rv
255
256	USE control_parameters, &
257	ONLY: humidity
258
259	USE indices, &
260	ONLY: nbgp, nxl, nxlg, nxlu, nxr, nxrg, nyn, nyng, nys, nysg, nysv, &
261	nz, nzb, nzt
262
263	USE kinds
264
265	USE pegrid
266
267	USE surface_mod, &
268	ONLY: get_topography_top_index_ji
269
270
271	IMPLICIT NONE
272
273
274	CHARACTER (LEN=30) :: canopy_mode = 'block' !< canopy coverage
275	LOGICAL :: plant_canopy_transpiration = .FALSE. !< flag to switch calculation of transpiration and corresponding latent heat
276	!< for resolved plant canopy inside radiation model
277	!< (calls subroutine pcm_calc_transpiration_rate from module plant_canopy_mod)
278
279	INTEGER(iwp) :: pch_index = 0 !< plant canopy height/top index
280	INTEGER(iwp) :: lad_vertical_gradient_level_ind(10) = -9999 !< lad-profile levels (index)
281
282	INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE :: pch_index_ji !< local plant canopy top
283
284	LOGICAL :: calc_beta_lad_profile = .FALSE. !< switch for calc. of lad from beta func.
285
286	REAL(wp) :: alpha_lad = 9999999.9_wp !< coefficient for lad calculation
287	REAL(wp) :: beta_lad = 9999999.9_wp !< coefficient for lad calculation
288	REAL(wp) :: canopy_drag_coeff = 0.0_wp !< canopy drag coefficient (parameter)
289	REAL(wp) :: cdc = 0.0_wp !< canopy drag coeff. (abbreviation used in equations)
290	REAL(wp) :: cthf = 0.0_wp !< canopy top heat flux
291	REAL(wp) :: dt_plant_canopy = 0.0_wp !< timestep account. for canopy drag
292	REAL(wp) :: ext_coef = 0.6_wp !< extinction coefficient
293	REAL(wp) :: lad_surface = 0.0_wp !< lad surface value
294	REAL(wp) :: lai_beta = 0.0_wp !< leaf area index (lai) for lad calc.
295	REAL(wp) :: leaf_scalar_exch_coeff = 0.0_wp !< canopy scalar exchange coeff.
296	REAL(wp) :: leaf_surface_conc = 0.0_wp !< leaf surface concentration
297	REAL(wp) :: lsc = 0.0_wp !< leaf surface concentration
298	REAL(wp) :: lsec = 0.0_wp !< leaf scalar exchange coeff.
299
300	REAL(wp) :: lad_vertical_gradient(10) = 0.0_wp !< lad gradient
301	REAL(wp) :: lad_vertical_gradient_level(10) = -9999999.9_wp !< lad-prof. levels (in m)
302
303	REAL(wp) :: lad_type_coef(0:10) = 1.0_wp !< multiplicative coeficients for particular types
304	!< of plant canopy (e.g. deciduous tree during winter)
305
306	REAL(wp), DIMENSION(:), ALLOCATABLE :: lad !< leaf area density
307	REAL(wp), DIMENSION(:), ALLOCATABLE :: pre_lad !< preliminary lad
308
309	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: cum_lai_hf !< cumulative lai for heatflux calc.
310	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: lad_s !< lad on scalar-grid
311	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pc_heating_rate !< plant canopy heating rate
312	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pc_transpiration_rate !< plant canopy transpiration rate
313	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pc_latent_rate !< plant canopy latent heating rate
314
315	SAVE
316
317
318	PRIVATE
319
320	!
321	!-- Public functions
322	PUBLIC pcm_calc_transpiration_rate, pcm_check_data_output, &
323	pcm_check_parameters, pcm_data_output_3d, pcm_define_netcdf_grid, &
324	pcm_header, pcm_init, pcm_parin, pcm_tendency
325
326	!
327	!-- Public variables and constants
328	PUBLIC cdc, pc_heating_rate, pc_transpiration_rate, pc_latent_rate, &
329	canopy_mode, cthf, dt_plant_canopy, lad, lad_s, pch_index, &
330	plant_canopy_transpiration
331
332	INTERFACE pcm_calc_transpiration_rate
333	MODULE PROCEDURE pcm_calc_transpiration_rate
334	END INTERFACE pcm_calc_transpiration_rate
335
336	INTERFACE pcm_check_data_output
337	MODULE PROCEDURE pcm_check_data_output
338	END INTERFACE pcm_check_data_output
339
340	INTERFACE pcm_check_parameters
341	MODULE PROCEDURE pcm_check_parameters
342	END INTERFACE pcm_check_parameters
343
344	INTERFACE pcm_data_output_3d
345	MODULE PROCEDURE pcm_data_output_3d
346	END INTERFACE pcm_data_output_3d
347
348	INTERFACE pcm_define_netcdf_grid
349	MODULE PROCEDURE pcm_define_netcdf_grid
350	END INTERFACE pcm_define_netcdf_grid
351
352	INTERFACE pcm_header
353	MODULE PROCEDURE pcm_header
354	END INTERFACE pcm_header
355
356	INTERFACE pcm_init
357	MODULE PROCEDURE pcm_init
358	END INTERFACE pcm_init
359
360	INTERFACE pcm_parin
361	MODULE PROCEDURE pcm_parin
362	END INTERFACE pcm_parin
363
364	INTERFACE pcm_read_plant_canopy_3d
365	MODULE PROCEDURE pcm_read_plant_canopy_3d
366	END INTERFACE pcm_read_plant_canopy_3d
367
368	INTERFACE pcm_tendency
369	MODULE PROCEDURE pcm_tendency
370	MODULE PROCEDURE pcm_tendency_ij
371	END INTERFACE pcm_tendency
372
373
374	CONTAINS
375
376
377
378	!------------------------------------------------------------------------------!
379	! Description:
380	! ------------
381	!> Calculation of the plant canopy transpiration rate based on the Jarvis-Stewart
382	!> with parametrizations described in Daudet et al. (1999; Agricult. and Forest
383	!> Meteorol. 97) and Ngao, Adam and Saudreau (2017; Agricult. and Forest Meteorol
384	!> 237-238). Model functions f1-f4 were adapted from Stewart (1998; Agric.
385	!> and Forest. Meteorol. 43) instead, because they are valid for broader intervals
386	!> of values. Funcion f4 used in form present in van Wijk et al. (1998;
387	!> Tree Physiology 20).
388	!>
389	!> This subroutine is called from subroutine radiation_interaction
390	!> after the calculation of radiation in plant canopy boxes.
391	!> (arrays pcbinsw and pcbinlw).
392	!>
393	!------------------------------------------------------------------------------!
394	SUBROUTINE pcm_calc_transpiration_rate(i, j, k, kk, pcbsw, pcblw, pcbtr, pcblh)
395
396	USE control_parameters, &
397	ONLY: dz
398
399	USE grid_variables, &
400	ONLY: dx, dy
401
402	IMPLICIT NONE
403	!-- input parameters
404	INTEGER(iwp), INTENT(IN) :: i, j, k, kk !< indices of the pc gridbox
405	REAL(wp), INTENT(IN) :: pcbsw !< sw radiation in gridbox (W)
406	REAL(wp), INTENT(IN) :: pcblw !< lw radiation in gridbox (W)
407	REAL(wp), INTENT(OUT) :: pcbtr !< transpiration rate dq/dt (kg/kg/s)
408	REAL(wp), INTENT(OUT) :: pcblh !< latent heat from transpiration dT/dt (K/s)
409
410	!-- variables and parameters for calculation of transpiration rate
411	REAL(wp) :: sat_press, sat_press_d, temp, v_lad
412	REAL(wp) :: d_fact, g_b, g_s, wind_speed, evapor_rate
413	REAL(wp) :: f1, f2, f3, f4, vpd, rswc, e_eq, e_imp, rad
414	REAL(wp), PARAMETER :: gama_psychr = 66 !< psychrometric constant (Pa/K)
415	REAL(wp), PARAMETER :: g_s_max = 0.01 !< maximum stomatal conductivity (m/s)
416	REAL(wp), PARAMETER :: m_soil = 0.4_wp !< soil water content (needs to adjust or take from LSM)
417	REAL(wp), PARAMETER :: m_wilt = 0.01_wp !< wilting point soil water content (needs to adjust or take from LSM)
418	REAL(wp), PARAMETER :: m_sat = 0.51_wp !< saturation soil water content (needs to adjust or take from LSM)
419	REAL(wp), PARAMETER :: t2_min = 0.0_wp !< minimal temperature for calculation of f2
420	REAL(wp), PARAMETER :: t2_max = 40.0_wp !< maximal temperature for calculation of f2
421
422
423	!-- Temperature (deg C)
424	temp = pt(k,j,i) * exner(k) - degc_to_k
425	!-- Coefficient for conversion of radiation to grid to radiation to unit leaves surface
426	v_lad = 1.0_wp / ( MAX( lad_s(kk,j,i), 1.0e-10_wp ) * dx * dy * dz(1) )
427	!-- Magnus formula for the saturation pressure (see Ngao, Adam and Saudreau (2017) eq. 1)
428	!-- There are updated formulas available, kept consistent with the rest of the parametrization
429	sat_press = 610.8_wp * exp(17.27_wp * temp/(temp + 237.3_wp))
430	!-- Saturation pressure derivative (derivative of the above)
431	sat_press_d = sat_press * 17.27_wp * 237.3_wp / (temp + 237.3_wp)**2
432	!-- Wind speed
433	wind_speed = SQRT( ( 0.5_wp * ( u(k,j,i) + u(k,j,i+1) ) )**2 + &
434	( 0.5_wp * ( v(k,j,i) + v(k,j,i+1) ) )**2 + &
435	( 0.5_wp * ( w(k,j,i) + w(k,j,i+1) ) )**2 )
436	!-- Aerodynamic conductivity (Daudet et al. (1999) eq. 14
437	g_b = 0.01_wp * wind_speed + 0.0071_wp
438	!-- Radiation flux per leaf surface unit
439	rad = pcbsw * v_lad
440	!-- First function for calculation of stomatal conductivity (radiation dependency)
441	!-- Stewart (1988; Agric. and Forest. Meteorol. 43) eq. 17
442	f1 = rad * (1000._wp+42.1_wp) / 1000._wp / (rad+42.1_wp)
443	!-- Second function for calculation of stomatal conductivity (temperature dependency)
444	!-- Stewart (1988; Agric. and Forest. Meteorol. 43) eq. 21
445	f2 = MAX(t2_min, (temp-t2_min) * MAX(0.0_wp,t2_max-temp)**((t2_max-16.9_wp)/(16.9_wp-t2_min)) / &
446	((16.9_wp-t2_min) * (t2_max-16.9_wp)**((t2_max-16.9_wp)/(16.9_wp-t2_min))) )
447	!-- Water pressure deficit
448	!-- Ngao, Adam and Saudreau (2017) eq. 6 but with water vapour partial pressure
449	vpd = max( sat_press - q(k,j,i) * hyp(k) / rd_d_rv, 0._wp )
450	!-- Third function for calculation of stomatal conductivity (water pressure deficit dependency)
451	!-- Ngao, Adam and Saudreau (2017) Table 1, limited from below according to Stewart (1988)
452	!-- The coefficients of the linear dependence should better correspond to broad-leaved trees
453	!-- than the coefficients from Stewart (1988) which correspond to conifer trees.
454	vpd = MIN(MAX(vpd,770.0_wp),3820.0_wp)
455	f3 = -2e-4_wp * vpd + 1.154_wp
456	!-- Fourth function for calculation of stomatal conductivity (soil moisture dependency)
457	!-- Residual soil water content
458	!-- van Wijk et al. (1998; Tree Physiology 20) eq. 7
459	!-- TODO - over LSM surface might be calculated from LSM parameters
460	rswc = ( m_sat - m_soil ) / ( m_sat - m_wilt )
461	!-- van Wijk et al. (1998; Tree Physiology 20) eq. 5-6 (it is a reformulation of eq. 22-23 of Stewart(1988))
462	f4 = MAX(0._wp, MIN(1.0_wp - 0.041_wp * EXP(3.2_wp * rswc), 1.0_wp - 0.041_wp))
463	!-- Stomatal conductivity
464	!-- Stewart (1988; Agric. and Forest. Meteorol. 43) eq. 12
465	!-- (notation according to Ngao, Adam and Saudreau (2017) and others)
466	g_s = g_s_max * f1 * f2 * f3 * f4 + 1.0e-10_wp
467	!-- Decoupling factor
468	!-- Daudet et al. (1999) eq. 6
469	d_fact = (sat_press_d / gama_psychr + 2._wp ) / &
470	(sat_press_d / gama_psychr + 2._wp + 2 * g_b / g_s )
471	!-- Equilibrium evaporation rate
472	!-- Daudet et al. (1999) eq. 4
473	e_eq = (pcbsw + pcblw) * v_lad * sat_press_d / &
474	gama_psychr /( sat_press_d / gama_psychr + 2.0_wp ) / l_v
475	!-- Imposed evaporation rate
476	!-- Daudet et al. (1999) eq. 5
477	e_imp = r_d * pt(k,j,i) * exner(k) / hyp(k) * c_p * g_s * vpd / gama_psychr / l_v
478	!-- Evaporation rate
479	!-- Daudet et al. (1999) eq. 3
480	!-- (evaporation rate is limited to non-negative values)
481	evapor_rate = MAX(d_fact * e_eq + ( 1.0_wp - d_fact ) * e_imp, 0.0_wp)
482	!-- Conversion of evaporation rate to q tendency in gridbox
483	!-- dq/dt = E * LAD * V_g / (rho_air * V_g)
484	pcbtr = evapor_rate * r_d * pt(k,j,i) * exner(k) * lad_s(kk,j,i) / hyp(k) !-- = dq/dt
485	!-- latent heat from evaporation
486	pcblh = pcbtr * lv_d_cp !-- = - dT/dt
487
488	END SUBROUTINE pcm_calc_transpiration_rate
489
490
491	!------------------------------------------------------------------------------!
492	! Description:
493	! ------------
494	!> Check data output for plant canopy model
495	!------------------------------------------------------------------------------!
496	SUBROUTINE pcm_check_data_output( var, unit )
497
498
499	USE control_parameters, &
500	ONLY: message_string, urban_surface
501
502	IMPLICIT NONE
503
504	CHARACTER (LEN=*) :: unit !<
505	CHARACTER (LEN=*) :: var !<
506
507
508	SELECT CASE ( TRIM( var ) )
509
510	CASE ( 'pcm_heatrate' )
511	IF ( cthf == 0.0_wp .AND. .NOT. urban_surface ) THEN
512	message_string = 'output of "' // TRIM( var ) // '" requi' // &
513	'res setting of parameter cthf /= 0.0'
514	CALL message( 'pcm_check_data_output', 'PA1000', 1, 2, 0, 6, 0 )
515	ENDIF
516	unit = 'K s-1'
517
518	CASE ( 'pcm_transpirationrate' )
519	unit = 'kg kg-1 s-1'
520
521	CASE ( 'pcm_latentrate' )
522	unit = 'K s-1'
523
524	CASE ( 'pcm_bowenratio' )
525	unit = 'K s-1'
526
527	CASE ( 'pcm_lad' )
528	unit = 'm2 m-3'
529
530
531	CASE DEFAULT
532	unit = 'illegal'
533
534	END SELECT
535
536
537	END SUBROUTINE pcm_check_data_output
538
539
540	!------------------------------------------------------------------------------!
541	! Description:
542	! ------------
543	!> Check parameters routine for plant canopy model
544	!------------------------------------------------------------------------------!
545	SUBROUTINE pcm_check_parameters
546
547	USE control_parameters, &
548	ONLY: coupling_char, message_string
549
550	USE bulk_cloud_model_mod, &
551	ONLY: bulk_cloud_model, microphysics_seifert
552
553	USE netcdf_data_input_mod, &
554	ONLY: input_file_static, input_pids_static
555
556
557	IMPLICIT NONE
558
559
560	IF ( canopy_drag_coeff == 0.0_wp ) THEN
561	message_string = 'plant_canopy = .TRUE. requires a non-zero drag '// &
562	'coefficient & given value is canopy_drag_coeff = 0.0'
563	CALL message( 'pcm_check_parameters', 'PA0041', 1, 2, 0, 6, 0 )
564	ENDIF
565
566	IF ( ( alpha_lad /= 9999999.9_wp .AND. beta_lad == 9999999.9_wp ) .OR.&
567	beta_lad /= 9999999.9_wp .AND. alpha_lad == 9999999.9_wp ) THEN
568	message_string = 'using the beta function for the construction ' // &
569	'of the leaf area density profile requires ' // &
570	'both alpha_lad and beta_lad to be /= 9999999.9'
571	CALL message( 'pcm_check_parameters', 'PA0118', 1, 2, 0, 6, 0 )
572	ENDIF
573
574	IF ( calc_beta_lad_profile .AND. lai_beta == 0.0_wp ) THEN
575	message_string = 'using the beta function for the construction ' // &
576	'of the leaf area density profile requires ' // &
577	'a non-zero lai_beta, but given value is ' // &
578	'lai_beta = 0.0'
579	CALL message( 'pcm_check_parameters', 'PA0119', 1, 2, 0, 6, 0 )
580	ENDIF
581
582	IF ( calc_beta_lad_profile .AND. lad_surface /= 0.0_wp ) THEN
583	message_string = 'simultaneous setting of alpha_lad /= 9999999.9 '// &
584	'combined with beta_lad /= 9999999.9 ' // &
585	'and lad_surface /= 0.0 is not possible, ' // &
586	'use either vertical gradients or the beta ' // &
587	'function for the construction of the leaf area '// &
588	'density profile'
589	CALL message( 'pcm_check_parameters', 'PA0120', 1, 2, 0, 6, 0 )
590	ENDIF
591
592	IF ( bulk_cloud_model .AND. microphysics_seifert ) THEN
593	message_string = 'plant_canopy = .TRUE. requires cloud_scheme /=' // &
594	' seifert_beheng'
595	CALL message( 'pcm_check_parameters', 'PA0360', 1, 2, 0, 6, 0 )
596	ENDIF
597	!
598	!-- If dynamic input file is used, canopy need to be read from file
599	IF ( input_pids_static .AND. &
600	TRIM( canopy_mode ) /= 'read_from_file_3d' ) THEN
601	message_string = 'Usage of dynamic input file ' // &
602	TRIM( input_file_static ) // &
603	TRIM( coupling_char ) // ' requires ' // &
604	'canopy_mode = read_from_file_3d'
605	CALL message( 'pcm_check_parameters', 'PA0999', 1, 2, 0, 6, 0 )
606	ENDIF
607
608
609	END SUBROUTINE pcm_check_parameters
610
611
612	!------------------------------------------------------------------------------!
613	!
614	! Description:
615	! ------------
616	!> Subroutine defining 3D output variables
617	!------------------------------------------------------------------------------!
618	SUBROUTINE pcm_data_output_3d( av, variable, found, local_pf, fill_value, &
619	nzb_do, nzt_do )
620
621	USE indices
622
623	USE kinds
624
625
626	IMPLICIT NONE
627
628	CHARACTER (LEN=*) :: variable !<
629
630	INTEGER(iwp) :: av !<
631	INTEGER(iwp) :: i !<
632	INTEGER(iwp) :: j !<
633	INTEGER(iwp) :: k !<
634	INTEGER(iwp) :: k_topo !< topography top index
635	INTEGER(iwp) :: nzb_do !< lower limit of the data output (usually 0)
636	INTEGER(iwp) :: nzt_do !< vertical upper limit of the data output (usually nz_do3d)
637
638	LOGICAL :: found !<
639
640	REAL(wp) :: fill_value
641	REAL(sp), DIMENSION(nxl:nxr,nys:nyn,nzb_do:nzt_do) :: local_pf !<
642
643
644	found = .TRUE.
645
646	local_pf = REAL( fill_value, KIND = 4 )
647
648	SELECT CASE ( TRIM( variable ) )
649
650	CASE ( 'pcm_heatrate' )
651	IF ( av == 0 ) THEN
652	DO i = nxl, nxr
653	DO j = nys, nyn
654	IF ( pch_index_ji(j,i) /= 0 ) THEN
655	k_topo = get_topography_top_index_ji( j, i, 's' )
656	DO k = k_topo, k_topo + pch_index_ji(j,i)
657	local_pf(i,j,k) = pc_heating_rate(k-k_topo,j,i)
658	ENDDO
659	ENDIF
660	ENDDO
661	ENDDO
662	ENDIF
663
664	CASE ( 'pcm_transpirationrate' )
665	IF ( av == 0 ) THEN
666	DO i = nxl, nxr
667	DO j = nys, nyn
668	IF ( pch_index_ji(j,i) /= 0 ) THEN
669	k_topo = get_topography_top_index_ji( j, i, 's' )
670	DO k = k_topo, k_topo + pch_index_ji(j,i)
671	local_pf(i,j,k) = pc_transpiration_rate(k-k_topo,j,i)
672	ENDDO
673	ENDIF
674	ENDDO
675	ENDDO
676	ENDIF
677
678	CASE ( 'pcm_latentrate' )
679	IF ( av == 0 ) THEN
680	DO i = nxl, nxr
681	DO j = nys, nyn
682	IF ( pch_index_ji(j,i) /= 0 ) THEN
683	k_topo = get_topography_top_index_ji( j, i, 's' )
684	DO k = k_topo, k_topo + pch_index_ji(j,i)
685	local_pf(i,j,k) = pc_latent_rate(k-k_topo,j,i)
686	ENDDO
687	ENDIF
688	ENDDO
689	ENDDO
690	ENDIF
691
692	CASE ( 'pcm_bowenratio' )
693	IF ( av == 0 ) THEN
694	DO i = nxl, nxr
695	DO j = nys, nyn
696	IF ( pch_index_ji(j,i) /= 0 ) THEN
697	k_topo = get_topography_top_index_ji( j, i, 's' )
698	DO k = k_topo, k_topo + pch_index_ji(j,i)
699	IF ( pc_latent_rate(k-k_topo,j,i) /= 0._wp ) THEN
700	local_pf(i,j,k) = pc_heating_rate(k-k_topo,j,i) / &
701	pc_latent_rate(k-k_topo,j,i)
702	ENDIF
703	ENDDO
704	ENDIF
705	ENDDO
706	ENDDO
707	ENDIF
708
709	CASE ( 'pcm_lad' )
710	IF ( av == 0 ) THEN
711	DO i = nxl, nxr
712	DO j = nys, nyn
713	IF ( pch_index_ji(j,i) /= 0 ) THEN
714	k_topo = get_topography_top_index_ji( j, i, 's' )
715	DO k = k_topo, k_topo + pch_index_ji(j,i)
716	local_pf(i,j,k) = lad_s(k-k_topo,j,i)
717	ENDDO
718	ENDIF
719	ENDDO
720	ENDDO
721	ENDIF
722
723
724	CASE DEFAULT
725	found = .FALSE.
726
727	END SELECT
728
729
730	END SUBROUTINE pcm_data_output_3d
731
732	!------------------------------------------------------------------------------!
733	!
734	! Description:
735	! ------------
736	!> Subroutine defining appropriate grid for netcdf variables.
737	!> It is called from subroutine netcdf.
738	!------------------------------------------------------------------------------!
739	SUBROUTINE pcm_define_netcdf_grid( var, found, grid_x, grid_y, grid_z )
740
741	IMPLICIT NONE
742
743	CHARACTER (LEN=*), INTENT(IN) :: var !<
744	LOGICAL, INTENT(OUT) :: found !<
745	CHARACTER (LEN=*), INTENT(OUT) :: grid_x !<
746	CHARACTER (LEN=*), INTENT(OUT) :: grid_y !<
747	CHARACTER (LEN=*), INTENT(OUT) :: grid_z !<
748
749	found = .TRUE.
750
751	!
752	!-- Check for the grid
753	SELECT CASE ( TRIM( var ) )
754
755	CASE ( 'pcm_heatrate', 'pcm_lad', 'pcm_transpirationrate', 'pcm_latentrate', 'pcm_bowenratio')
756	grid_x = 'x'
757	grid_y = 'y'
758	grid_z = 'zu'
759
760	CASE DEFAULT
761	found = .FALSE.
762	grid_x = 'none'
763	grid_y = 'none'
764	grid_z = 'none'
765	END SELECT
766
767	END SUBROUTINE pcm_define_netcdf_grid
768
769
770	!------------------------------------------------------------------------------!
771	! Description:
772	! ------------
773	!> Header output for plant canopy model
774	!------------------------------------------------------------------------------!
775	SUBROUTINE pcm_header ( io )
776
777	USE control_parameters, &
778	ONLY: passive_scalar
779
780
781	IMPLICIT NONE
782
783	CHARACTER (LEN=10) :: coor_chr !<
784
785	CHARACTER (LEN=86) :: coordinates !<
786	CHARACTER (LEN=86) :: gradients !<
787	CHARACTER (LEN=86) :: leaf_area_density !<
788	CHARACTER (LEN=86) :: slices !<
789
790	INTEGER(iwp) :: i !<
791	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
792	INTEGER(iwp) :: k !<
793
794	REAL(wp) :: canopy_height !< canopy height (in m)
795
796	canopy_height = zw(pch_index)
797
798	WRITE ( io, 1 ) canopy_mode, canopy_height, pch_index, &
799	canopy_drag_coeff
800	IF ( passive_scalar ) THEN
801	WRITE ( io, 2 ) leaf_scalar_exch_coeff, &
802	leaf_surface_conc
803	ENDIF
804
805	!
806	!-- Heat flux at the top of vegetation
807	WRITE ( io, 3 ) cthf
808
809	!
810	!-- Leaf area density profile, calculated either from given vertical
811	!-- gradients or from beta probability density function.
812	IF ( .NOT. calc_beta_lad_profile ) THEN
813
814	!-- Building output strings, starting with surface value
815	WRITE ( leaf_area_density, '(F7.4)' ) lad_surface
816	gradients = '------'
817	slices = ' 0'
818	coordinates = ' 0.0'
819	i = 1
820	DO WHILE ( i < 11 .AND. lad_vertical_gradient_level_ind(i) &
821	/= -9999 )
822
823	WRITE (coor_chr,'(F7.2)') lad(lad_vertical_gradient_level_ind(i))
824	leaf_area_density = TRIM( leaf_area_density ) // ' ' // &
825	TRIM( coor_chr )
826
827	WRITE (coor_chr,'(F7.2)') lad_vertical_gradient(i)
828	gradients = TRIM( gradients ) // ' ' // TRIM( coor_chr )
829
830	WRITE (coor_chr,'(I7)') lad_vertical_gradient_level_ind(i)
831	slices = TRIM( slices ) // ' ' // TRIM( coor_chr )
832
833	WRITE (coor_chr,'(F7.1)') lad_vertical_gradient_level(i)
834	coordinates = TRIM( coordinates ) // ' ' // TRIM( coor_chr )
835
836	i = i + 1
837	ENDDO
838
839	WRITE ( io, 4 ) TRIM( coordinates ), TRIM( leaf_area_density ), &
840	TRIM( gradients ), TRIM( slices )
841
842	ELSE
843
844	WRITE ( leaf_area_density, '(F7.4)' ) lad_surface
845	coordinates = ' 0.0'
846
847	DO k = 1, pch_index
848
849	WRITE (coor_chr,'(F7.2)') lad(k)
850	leaf_area_density = TRIM( leaf_area_density ) // ' ' // &
851	TRIM( coor_chr )
852
853	WRITE (coor_chr,'(F7.1)') zu(k)
854	coordinates = TRIM( coordinates ) // ' ' // TRIM( coor_chr )
855
856	ENDDO
857
858	WRITE ( io, 5 ) TRIM( coordinates ), TRIM( leaf_area_density ), &
859	alpha_lad, beta_lad, lai_beta
860
861	ENDIF
862
863	1 FORMAT (//' Vegetation canopy (drag) model:'/ &
864	' ------------------------------'// &
865	' Canopy mode: ', A / &
866	' Canopy height: ',F6.2,'m (',I4,' grid points)' / &
867	' Leaf drag coefficient: ',F6.2 /)
868	2 FORMAT (/ ' Scalar exchange coefficient: ',F6.2 / &
869	' Scalar concentration at leaf surfaces in kg/m**3: ',F6.2 /)
870	3 FORMAT (' Predefined constant heatflux at the top of the vegetation: ',F6.2, &
871	' K m/s')
872	4 FORMAT (/ ' Characteristic levels of the leaf area density:'// &
873	' Height: ',A,' m'/ &
874	' Leaf area density: ',A,' m2/m3'/ &
875	' Gradient: ',A,' m2/m4'/ &
876	' Gridpoint: ',A)
877	5 FORMAT (//' Characteristic levels of the leaf area density and coefficients:'&
878	// ' Height: ',A,' m'/ &
879	' Leaf area density: ',A,' m2/m3'/ &
880	' Coefficient alpha: ',F6.2 / &
881	' Coefficient beta: ',F6.2 / &
882	' Leaf area index: ',F6.2,' m2/m2' /)
883
884	END SUBROUTINE pcm_header
885
886
887	!------------------------------------------------------------------------------!
888	! Description:
889	! ------------
890	!> Initialization of the plant canopy model
891	!------------------------------------------------------------------------------!
892	SUBROUTINE pcm_init
893
894
895	USE control_parameters, &
896	ONLY: message_string, ocean_mode
897
898	USE netcdf_data_input_mod, &
899	ONLY: leaf_area_density_f
900
901	USE surface_mod, &
902	ONLY: surf_def_h, surf_lsm_h, surf_usm_h
903
904	IMPLICIT NONE
905
906	INTEGER(iwp) :: i !< running index
907	INTEGER(iwp) :: j !< running index
908	INTEGER(iwp) :: k !< running index
909	INTEGER(iwp) :: m !< running index
910
911	REAL(wp) :: int_bpdf !< vertical integral for lad-profile construction
912	REAL(wp) :: gradient !< gradient for lad-profile construction
913	REAL(wp) :: canopy_height !< canopy height for lad-profile construction
914
915	CALL location_message( 'initializing plant canopy model', .FALSE. )
916	!
917	!-- Allocate one-dimensional arrays for the computation of the
918	!-- leaf area density (lad) profile
919	ALLOCATE( lad(0:nz+1), pre_lad(0:nz+1) )
920	lad = 0.0_wp
921	pre_lad = 0.0_wp
922
923	!
924	!-- Set flag that indicates that the lad-profile shall be calculated by using
925	!-- a beta probability density function
926	IF ( alpha_lad /= 9999999.9_wp .AND. beta_lad /= 9999999.9_wp ) THEN
927	calc_beta_lad_profile = .TRUE.
928	ENDIF
929
930
931	!
932	!-- Compute the profile of leaf area density used in the plant
933	!-- canopy model. The profile can either be constructed from
934	!-- prescribed vertical gradients of the leaf area density or by
935	!-- using a beta probability density function (see e.g. Markkanen et al.,
936	!-- 2003: Boundary-Layer Meteorology, 106, 437-459)
937	IF ( .NOT. calc_beta_lad_profile ) THEN
938
939	!
940	!-- Use vertical gradients for lad-profile construction
941	i = 1
942	gradient = 0.0_wp
943
944	IF ( .NOT. ocean_mode ) THEN
945
946	lad(0) = lad_surface
947	lad_vertical_gradient_level_ind(1) = 0
948
949	DO k = 1, pch_index
950	IF ( i < 11 ) THEN
951	IF ( lad_vertical_gradient_level(i) < zu(k) .AND. &
952	lad_vertical_gradient_level(i) >= 0.0_wp ) THEN
953	gradient = lad_vertical_gradient(i)
954	lad_vertical_gradient_level_ind(i) = k - 1
955	i = i + 1
956	ENDIF
957	ENDIF
958	IF ( gradient /= 0.0_wp ) THEN
959	IF ( k /= 1 ) THEN
960	lad(k) = lad(k-1) + dzu(k) * gradient
961	ELSE
962	lad(k) = lad_surface + dzu(k) * gradient
963	ENDIF
964	ELSE
965	lad(k) = lad(k-1)
966	ENDIF
967	ENDDO
968
969	ENDIF
970
971	!
972	!-- In case of no given leaf area density gradients, choose a vanishing
973	!-- gradient. This information is used for the HEADER and the RUN_CONTROL
974	!-- file.
975	IF ( lad_vertical_gradient_level(1) == -9999999.9_wp ) THEN
976	lad_vertical_gradient_level(1) = 0.0_wp
977	ENDIF
978
979	ELSE
980
981	!
982	!-- Use beta function for lad-profile construction
983	int_bpdf = 0.0_wp
984	canopy_height = zw(pch_index)
985
986	DO k = 0, pch_index
987	int_bpdf = int_bpdf + &
988	( ( ( zw(k) / canopy_height )*( alpha_lad-1.0_wp ) ) &
989	( ( 1.0_wp - ( zw(k) / canopy_height ) )**( &
990	beta_lad-1.0_wp ) ) &
991	* ( ( zw(k+1)-zw(k) ) / canopy_height ) )
992	ENDDO
993
994	!
995	!-- Preliminary lad profile (defined on w-grid)
996	DO k = 0, pch_index
997	pre_lad(k) = lai_beta * &
998	( ( ( zw(k) / canopy_height )**( alpha_lad-1.0_wp ) ) &
999	* ( ( 1.0_wp - ( zw(k) / canopy_height ) )**( &
1000	beta_lad-1.0_wp ) ) / int_bpdf &
1001	) / canopy_height
1002	ENDDO
1003
1004	!
1005	!-- Final lad profile (defined on scalar-grid level, since most prognostic
1006	!-- quantities are defined there, hence, less interpolation is required
1007	!-- when calculating the canopy tendencies)
1008	lad(0) = pre_lad(0)
1009	DO k = 1, pch_index
1010	lad(k) = 0.5 * ( pre_lad(k-1) + pre_lad(k) )
1011	ENDDO
1012
1013	ENDIF
1014
1015	!
1016	!-- Allocate 3D-array for the leaf area density (lad_s).
1017	ALLOCATE( lad_s(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1018
1019	!
1020	!-- Initialize canopy parameters cdc (canopy drag coefficient),
1021	!-- lsec (leaf scalar exchange coefficient), lsc (leaf surface concentration)
1022	!-- with the prescribed values
1023	cdc = canopy_drag_coeff
1024	lsec = leaf_scalar_exch_coeff
1025	lsc = leaf_surface_conc
1026
1027	!
1028	!-- Initialization of the canopy coverage in the model domain:
1029	!-- Setting the parameter canopy_mode = 'block' initializes a canopy, which
1030	!-- fully covers the domain surface
1031	SELECT CASE ( TRIM( canopy_mode ) )
1032
1033	CASE( 'block' )
1034
1035	DO i = nxlg, nxrg
1036	DO j = nysg, nyng
1037	lad_s(:,j,i) = lad(:)
1038	ENDDO
1039	ENDDO
1040
1041	CASE ( 'read_from_file_3d' )
1042	!
1043	!-- Initialize LAD with data from file. If LAD is given in NetCDF file,
1044	!-- use these values, else take LAD profiles from ASCII file.
1045	!-- Please note, in NetCDF file LAD is only given up to the maximum
1046	!-- canopy top, indicated by leaf_area_density_f%nz.
1047	lad_s = 0.0_wp
1048	IF ( leaf_area_density_f%from_file ) THEN
1049	!
1050	!-- Set also pch_index, used to be the upper bound of the vertical
1051	!-- loops. Therefore, use the global top of the canopy layer.
1052	pch_index = leaf_area_density_f%nz - 1
1053
1054	DO i = nxl, nxr
1055	DO j = nys, nyn
1056	DO k = 0, leaf_area_density_f%nz - 1
1057	IF ( leaf_area_density_f%var(k,j,i) /= &
1058	leaf_area_density_f%fill ) &
1059	lad_s(k,j,i) = leaf_area_density_f%var(k,j,i)
1060	ENDDO
1061	ENDDO
1062	ENDDO
1063	CALL exchange_horiz( lad_s, nbgp )
1064	!
1065	! ASCII file
1066	!-- Initialize canopy parameters cdc (canopy drag coefficient),
1067	!-- lsec (leaf scalar exchange coefficient), lsc (leaf surface concentration)
1068	!-- from file which contains complete 3D data (separate vertical profiles for
1069	!-- each location).
1070	ELSE
1071	CALL pcm_read_plant_canopy_3d
1072	ENDIF
1073
1074	CASE DEFAULT
1075	!
1076	!-- The DEFAULT case is reached either if the parameter
1077	!-- canopy mode contains a wrong character string or if the
1078	!-- user has coded a special case in the user interface.
1079	!-- There, the subroutine user_init_plant_canopy checks
1080	!-- which of these two conditions applies.
1081	CALL user_init_plant_canopy
1082
1083	END SELECT
1084	!
1085	!-- Initialize 2D index array indicating canopy top index.
1086	ALLOCATE( pch_index_ji(nysg:nyng,nxlg:nxrg) )
1087	pch_index_ji = 0
1088
1089	DO i = nxl, nxr
1090	DO j = nys, nyn
1091	DO k = 0, pch_index
1092	IF ( lad_s(k,j,i) /= 0 ) pch_index_ji(j,i) = k
1093	ENDDO
1094	!
1095	!-- Check whether topography and local vegetation on top exceed
1096	!-- height of the model domain.
1097	k = get_topography_top_index_ji( j, i, 's' )
1098	IF ( k + pch_index_ji(j,i) >= nzt + 1 ) THEN
1099	message_string = 'Local vegetation height on top of ' // &
1100	'topography exceeds height of model domain.'
1101	CALL message( 'pcm_init', 'PA0999', 2, 2, 0, 6, 0 )
1102	ENDIF
1103
1104	ENDDO
1105	ENDDO
1106
1107	CALL exchange_horiz_2d_int( pch_index_ji, nys, nyn, nxl, nxr, nbgp )
1108	!
1109	!-- Calculate global pch_index value (index of top of plant canopy from ground)
1110	pch_index = MAXVAL( pch_index_ji )
1111	!
1112	!-- Exchange pch_index from all processors
1113	#if defined( __parallel )
1114	CALL MPI_ALLREDUCE( MPI_IN_PLACE, pch_index, 1, MPI_INTEGER, &
1115	MPI_MAX, comm2d, ierr)
1116	#endif
1117
1118	!-- Allocation of arrays pc_heating_rate, pc_transpiration_rate and pc_latent_rate
1119	ALLOCATE( pc_heating_rate(0:pch_index,nysg:nyng,nxlg:nxrg) )
1120	IF ( humidity ) THEN
1121	ALLOCATE( pc_transpiration_rate(0:pch_index,nysg:nyng,nxlg:nxrg) )
1122	pc_transpiration_rate = 0.0_wp
1123	ALLOCATE( pc_latent_rate(0:pch_index,nysg:nyng,nxlg:nxrg) )
1124	pc_latent_rate = 0.0_wp
1125	ENDIF
1126
1127	!
1128	!-- Initialization of the canopy heat source distribution due to heating
1129	!-- of the canopy layers by incoming solar radiation, in case that a non-zero
1130	!-- value is set for the canopy top heat flux (cthf), which equals the
1131	!-- available net radiation at canopy top.
1132	!-- The heat source distribution is calculated by a decaying exponential
1133	!-- function of the downward cumulative leaf area index (cum_lai_hf),
1134	!-- assuming that the foliage inside the plant canopy is heated by solar
1135	!-- radiation penetrating the canopy layers according to the distribution
1136	!-- of net radiation as suggested by Brown & Covey (1966; Agric. Meteorol. 3,
1137	!-- 73â96). This approach has been applied e.g. by Shaw & Schumann (1992;
1138	!-- Bound.-Layer Meteorol. 61, 47â64).
1139	!-- When using the radiation_interactions, canopy heating (pc_heating_rate)
1140	!-- and plant canopy transpiration (pc_transpiration_rate, pc_latent_rate)
1141	!-- are calculated in the RTM after the calculation of radiation.
1142	!-- We cannot use variable radiation_interactions here to determine the situation
1143	!-- as it is assigned in init_3d_model after the call of pcm_init.
1144	IF ( cthf /= 0.0_wp ) THEN
1145
1146	ALLOCATE( cum_lai_hf(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
1147	!
1148	!-- Piecewise calculation of the cumulative leaf area index by vertical
1149	!-- integration of the leaf area density
1150	cum_lai_hf(:,:,:) = 0.0_wp
1151	DO i = nxlg, nxrg
1152	DO j = nysg, nyng
1153	DO k = pch_index_ji(j,i)-1, 0, -1
1154	IF ( k == pch_index_ji(j,i)-1 ) THEN
1155	cum_lai_hf(k,j,i) = cum_lai_hf(k+1,j,i) + &
1156	( 0.5_wp * lad_s(k+1,j,i) * &
1157	( zw(k+1) - zu(k+1) ) ) + &
1158	( 0.5_wp * ( 0.5_wp * ( lad_s(k+1,j,i) + &
1159	lad_s(k,j,i) ) + &
1160	lad_s(k+1,j,i) ) * &
1161	( zu(k+1) - zw(k) ) )
1162	ELSE
1163	cum_lai_hf(k,j,i) = cum_lai_hf(k+1,j,i) + &
1164	( 0.5_wp * ( 0.5_wp * ( lad_s(k+2,j,i) + &
1165	lad_s(k+1,j,i) ) + &
1166	lad_s(k+1,j,i) ) * &
1167	( zw(k+1) - zu(k+1) ) ) + &
1168	( 0.5_wp * ( 0.5_wp * ( lad_s(k+1,j,i) + &
1169	lad_s(k,j,i) ) + &
1170	lad_s(k+1,j,i) ) * &
1171	( zu(k+1) - zw(k) ) )
1172	ENDIF
1173	ENDDO
1174	ENDDO
1175	ENDDO
1176
1177	!
1178	!-- In areas with canopy the surface value of the canopy heat
1179	!-- flux distribution overrides the surface heat flux (shf)
1180	!-- Start with default surface type
1181	DO m = 1, surf_def_h(0)%ns
1182	k = surf_def_h(0)%k(m)
1183	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) &
1184	surf_def_h(0)%shf(m) = cthf * exp( -ext_coef * cum_lai_hf(0,j,i) )
1185	ENDDO
1186	!
1187	!-- Natural surfaces
1188	DO m = 1, surf_lsm_h%ns
1189	k = surf_lsm_h%k(m)
1190	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) &
1191	surf_lsm_h%shf(m) = cthf * exp( -ext_coef * cum_lai_hf(0,j,i) )
1192	ENDDO
1193	!
1194	!-- Urban surfaces
1195	DO m = 1, surf_usm_h%ns
1196	k = surf_usm_h%k(m)
1197	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) &
1198	surf_usm_h%shf(m) = cthf * exp( -ext_coef * cum_lai_hf(0,j,i) )
1199	ENDDO
1200	!
1201	!
1202	!-- Calculation of the heating rate (K/s) within the different layers of
1203	!-- the plant canopy. Calculation is only necessary in areas covered with
1204	!-- canopy.
1205	!-- Within the different canopy layers the plant-canopy heating
1206	!-- rate (pc_heating_rate) is calculated as the vertical
1207	!-- divergence of the canopy heat fluxes at the top and bottom
1208	!-- of the respective layer
1209	DO i = nxlg, nxrg
1210	DO j = nysg, nyng
1211	DO k = 1, pch_index_ji(j,i)
1212	IF ( cum_lai_hf(0,j,i) /= 0.0_wp ) THEN
1213	pc_heating_rate(k,j,i) = cthf * &
1214	( exp(-ext_coef*cum_lai_hf(k,j,i)) - &
1215	exp(-ext_coef*cum_lai_hf(k-1,j,i) ) ) / dzw(k)
1216	ENDIF
1217	ENDDO
1218	ENDDO
1219	ENDDO
1220
1221	ENDIF
1222
1223	CALL location_message( 'finished', .TRUE. )
1224
1225
1226	END SUBROUTINE pcm_init
1227
1228
1229	!------------------------------------------------------------------------------!
1230	! Description:
1231	! ------------
1232	!> Parin for &plant_canopy_parameters for plant canopy model
1233	!------------------------------------------------------------------------------!
1234	SUBROUTINE pcm_parin
1235
1236	USE control_parameters, &
1237	ONLY: message_string, plant_canopy
1238
1239	IMPLICIT NONE
1240
1241	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
1242
1243	NAMELIST /plant_canopy_parameters/ &
1244	alpha_lad, beta_lad, canopy_drag_coeff, &
1245	canopy_mode, cthf, &
1246	lad_surface, lad_type_coef, &
1247	lad_vertical_gradient, &
1248	lad_vertical_gradient_level, &
1249	lai_beta, &
1250	leaf_scalar_exch_coeff, &
1251	leaf_surface_conc, pch_index, &
1252	plant_canopy_transpiration
1253
1254	NAMELIST /canopy_par/ alpha_lad, beta_lad, canopy_drag_coeff, &
1255	canopy_mode, cthf, &
1256	lad_surface, lad_type_coef, &
1257	lad_vertical_gradient, &
1258	lad_vertical_gradient_level, &
1259	lai_beta, &
1260	leaf_scalar_exch_coeff, &
1261	leaf_surface_conc, pch_index, &
1262	plant_canopy_transpiration
1263
1264	line = ' '
1265
1266	!
1267	!-- Try to find radiation model package
1268	REWIND ( 11 )
1269	line = ' '
1270	DO WHILE ( INDEX( line, '&plant_canopy_parameters' ) == 0 )
1271	READ ( 11, '(A)', END=12 ) line
1272	ENDDO
1273	BACKSPACE ( 11 )
1274
1275	!
1276	!-- Read user-defined namelist
1277	READ ( 11, plant_canopy_parameters, ERR = 10 )
1278
1279	!
1280	!-- Set flag that indicates that the radiation model is switched on
1281	plant_canopy = .TRUE.
1282
1283	GOTO 14
1284
1285	10 BACKSPACE( 11 )
1286	READ( 11 , '(A)') line
1287	CALL parin_fail_message( 'plant_canopy_parameters', line )
1288	!
1289	!-- Try to find old namelist
1290	12 REWIND ( 11 )
1291	line = ' '
1292	DO WHILE ( INDEX( line, '&canopy_par' ) == 0 )
1293	READ ( 11, '(A)', END=14 ) line
1294	ENDDO
1295	BACKSPACE ( 11 )
1296
1297	!
1298	!-- Read user-defined namelist
1299	READ ( 11, canopy_par, ERR = 13, END = 14 )
1300
1301	message_string = 'namelist canopy_par is deprecated and will be ' // &
1302	'removed in near future. Please use namelist ' // &
1303	'plant_canopy_parameters instead'
1304	CALL message( 'pcm_parin', 'PA0487', 0, 1, 0, 6, 0 )
1305
1306	!
1307	!-- Set flag that indicates that the radiation model is switched on
1308	plant_canopy = .TRUE.
1309
1310	GOTO 14
1311
1312	13 BACKSPACE( 11 )
1313	READ( 11 , '(A)') line
1314	CALL parin_fail_message( 'canopy_par', line )
1315
1316	14 CONTINUE
1317
1318
1319	END SUBROUTINE pcm_parin
1320
1321
1322
1323	!------------------------------------------------------------------------------!
1324	! Description:
1325	! ------------
1326	!
1327	!> Loads 3D plant canopy data from file. File format is as follows:
1328	!>
1329	!> num_levels
1330	!> dtype,x,y,pctype,value(nzb),value(nzb+1), ... ,value(nzb+num_levels-1)
1331	!> dtype,x,y,pctype,value(nzb),value(nzb+1), ... ,value(nzb+num_levels-1)
1332	!> dtype,x,y,pctype,value(nzb),value(nzb+1), ... ,value(nzb+num_levels-1)
1333	!> ...
1334	!>
1335	!> i.e. first line determines number of levels and further lines represent plant
1336	!> canopy data, one line per column and variable. In each data line,
1337	!> dtype represents variable to be set:
1338	!>
1339	!> dtype=1: leaf area density (lad_s)
1340	!> dtype=2....n: some additional plant canopy input data quantity
1341	!>
1342	!> Zeros are added automatically above num_levels until top of domain. Any
1343	!> non-specified (x,y) columns have zero values as default.
1344	!------------------------------------------------------------------------------!
1345	SUBROUTINE pcm_read_plant_canopy_3d
1346
1347	USE control_parameters, &
1348	ONLY: coupling_char, message_string
1349
1350	USE indices, &
1351	ONLY: nbgp
1352
1353	IMPLICIT NONE
1354
1355	INTEGER(iwp) :: dtype !< type of input data (1=lad)
1356	INTEGER(iwp) :: pctype !< type of plant canopy (deciduous,non-deciduous,...)
1357	INTEGER(iwp) :: i, j !< running index
1358	INTEGER(iwp) :: nzp !< number of vertical layers of plant canopy
1359	INTEGER(iwp) :: nzpltop !<
1360	INTEGER(iwp) :: nzpl !<
1361	INTEGER(iwp) :: kk !<
1362
1363	REAL(wp), DIMENSION(:), ALLOCATABLE :: col !< vertical column of input data
1364
1365	!
1366	!-- Initialize lad_s array
1367	lad_s = 0.0_wp
1368
1369	!
1370	!-- Open and read plant canopy input data
1371	OPEN(152, FILE='PLANT_CANOPY_DATA_3D' // TRIM( coupling_char ), &
1372	ACCESS='SEQUENTIAL', ACTION='READ', STATUS='OLD', &
1373	FORM='FORMATTED', ERR=515)
1374	READ(152, *, ERR=516, END=517) nzp !< read first line = number of vertical layers
1375	nzpltop = MIN(nzt+1, nzb+nzp-1)
1376	nzpl = nzpltop - nzb + 1 !< no. of layers to assign
1377	ALLOCATE( col(0:nzp-1) )
1378
1379	DO
1380	READ(152, *, ERR=516, END=517) dtype, i, j, pctype, col(:)
1381	IF ( i < nxlg .OR. i > nxrg .OR. j < nysg .OR. j > nyng ) CYCLE
1382
1383	SELECT CASE (dtype)
1384	CASE( 1 ) !< leaf area density
1385	!
1386	!-- This is just the pure canopy layer assumed to be grounded to
1387	!-- a flat domain surface. At locations where plant canopy sits
1388	!-- on top of any kind of topography, the vertical plant column
1389	!-- must be "lifted", which is done in SUBROUTINE pcm_tendency.
1390	IF ( pctype < 0 .OR. pctype > 10 ) THEN !< incorrect plant canopy type
1391	WRITE( message_string, * ) 'Incorrect type of plant canopy. ' // &
1392	'Allowed values 0 <= pctype <= 10, ' // &
1393	'but pctype is ', pctype
1394	CALL message( 'pcm_read_plant_canopy_3d', 'PA0349', 1, 2, 0, 6, 0 )
1395	ENDIF
1396	kk = get_topography_top_index_ji( j, i, 's' )
1397	lad_s(nzb:nzpltop-kk, j, i) = col(kk:nzpl-1)*lad_type_coef(pctype)
1398	CASE DEFAULT
1399	WRITE(message_string, '(a,i2,a)') &
1400	'Unknown record type in file PLANT_CANOPY_DATA_3D: "', dtype, '"'
1401	CALL message( 'pcm_read_plant_canopy_3d', 'PA0530', 1, 2, 0, 6, 0 )
1402	END SELECT
1403	ENDDO
1404
1405	515 message_string = 'error opening file PLANT_CANOPY_DATA_3D'
1406	CALL message( 'pcm_read_plant_canopy_3d', 'PA0531', 1, 2, 0, 6, 0 )
1407
1408	516 message_string = 'error reading file PLANT_CANOPY_DATA_3D'
1409	CALL message( 'pcm_read_plant_canopy_3d', 'PA0532', 1, 2, 0, 6, 0 )
1410
1411	517 CLOSE(152)
1412	DEALLOCATE( col )
1413
1414	CALL exchange_horiz( lad_s, nbgp )
1415
1416	END SUBROUTINE pcm_read_plant_canopy_3d
1417
1418
1419
1420	!------------------------------------------------------------------------------!
1421	! Description:
1422	! ------------
1423	!> Calculation of the tendency terms, accounting for the effect of the plant
1424	!> canopy on momentum and scalar quantities.
1425	!>
1426	!> The canopy is located where the leaf area density lad_s(k,j,i) > 0.0
1427	!> (defined on scalar grid), as initialized in subroutine pcm_init.
1428	!> The lad on the w-grid is vertically interpolated from the surrounding
1429	!> lad_s. The upper boundary of the canopy is defined on the w-grid at
1430	!> k = pch_index. Here, the lad is zero.
1431	!>
1432	!> The canopy drag must be limited (previously accounted for by calculation of
1433	!> a limiting canopy timestep for the determination of the maximum LES timestep
1434	!> in subroutine timestep), since it is physically impossible that the canopy
1435	!> drag alone can locally change the sign of a velocity component. This
1436	!> limitation is realized by calculating preliminary tendencies and velocities.
1437	!> It is subsequently checked if the preliminary new velocity has a different
1438	!> sign than the current velocity. If so, the tendency is limited in a way that
1439	!> the velocity can at maximum be reduced to zero by the canopy drag.
1440	!>
1441	!>
1442	!> Call for all grid points
1443	!------------------------------------------------------------------------------!
1444	SUBROUTINE pcm_tendency( component )
1445
1446
1447	USE control_parameters, &
1448	ONLY: dt_3d, message_string
1449
1450	USE kinds
1451
1452	IMPLICIT NONE
1453
1454	INTEGER(iwp) :: component !< prognostic variable (u,v,w,pt,q,e)
1455	INTEGER(iwp) :: i !< running index
1456	INTEGER(iwp) :: j !< running index
1457	INTEGER(iwp) :: k !< running index
1458	INTEGER(iwp) :: k_wall !< vertical index of topography top
1459	INTEGER(iwp) :: kk !< running index for flat lad arrays
1460
1461	REAL(wp) :: ddt_3d !< inverse of the LES timestep (dt_3d)
1462	REAL(wp) :: lad_local !< local lad value
1463	REAL(wp) :: pre_tend !< preliminary tendency
1464	REAL(wp) :: pre_u !< preliminary u-value
1465	REAL(wp) :: pre_v !< preliminary v-value
1466	REAL(wp) :: pre_w !< preliminary w-value
1467
1468
1469	ddt_3d = 1.0_wp / dt_3d
1470
1471	!
1472	!-- Compute drag for the three velocity components and the SGS-TKE:
1473	SELECT CASE ( component )
1474
1475	!
1476	!-- u-component
1477	CASE ( 1 )
1478	DO i = nxlu, nxr
1479	DO j = nys, nyn
1480	!
1481	!-- Determine topography-top index on u-grid
1482	k_wall = get_topography_top_index_ji( j, i, 'u' )
1483	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1484
1485	kk = k - k_wall !- lad arrays are defined flat
1486	!
1487	!-- In order to create sharp boundaries of the plant canopy,
1488	!-- the lad on the u-grid at index (k,j,i) is equal to
1489	!-- lad_s(k,j,i), rather than being interpolated from the
1490	!-- surrounding lad_s, because this would yield smaller lad
1491	!-- at the canopy boundaries than inside of the canopy.
1492	!-- For the same reason, the lad at the rightmost(i+1)canopy
1493	!-- boundary on the u-grid equals lad_s(k,j,i).
1494	lad_local = lad_s(kk,j,i)
1495	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j,i-1) > 0.0_wp )&
1496	THEN
1497	lad_local = lad_s(kk,j,i-1)
1498	ENDIF
1499
1500	pre_tend = 0.0_wp
1501	pre_u = 0.0_wp
1502	!
1503	!-- Calculate preliminary value (pre_tend) of the tendency
1504	pre_tend = - cdc * &
1505	lad_local * &
1506	SQRT( u(k,j,i)**2 + &
1507	( 0.25_wp * ( v(k,j,i-1) + &
1508	v(k,j,i) + &
1509	v(k,j+1,i) + &
1510	v(k,j+1,i-1) ) &
1511	)**2 + &
1512	( 0.25_wp * ( w(k-1,j,i-1) + &
1513	w(k-1,j,i) + &
1514	w(k,j,i-1) + &
1515	w(k,j,i) ) &
1516	)**2 &
1517	) * &
1518	u(k,j,i)
1519
1520	!
1521	!-- Calculate preliminary new velocity, based on pre_tend
1522	pre_u = u(k,j,i) + dt_3d * pre_tend
1523	!
1524	!-- Compare sign of old velocity and new preliminary velocity,
1525	!-- and in case the signs are different, limit the tendency
1526	IF ( SIGN(pre_u,u(k,j,i)) /= pre_u ) THEN
1527	pre_tend = - u(k,j,i) * ddt_3d
1528	ELSE
1529	pre_tend = pre_tend
1530	ENDIF
1531	!
1532	!-- Calculate final tendency
1533	tend(k,j,i) = tend(k,j,i) + pre_tend
1534
1535	ENDDO
1536	ENDDO
1537	ENDDO
1538
1539	!
1540	!-- v-component
1541	CASE ( 2 )
1542	DO i = nxl, nxr
1543	DO j = nysv, nyn
1544	!
1545	!-- Determine topography-top index on v-grid
1546	k_wall = get_topography_top_index_ji( j, i, 'v' )
1547
1548	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1549
1550	kk = k - k_wall !- lad arrays are defined flat
1551	!
1552	!-- In order to create sharp boundaries of the plant canopy,
1553	!-- the lad on the v-grid at index (k,j,i) is equal to
1554	!-- lad_s(k,j,i), rather than being interpolated from the
1555	!-- surrounding lad_s, because this would yield smaller lad
1556	!-- at the canopy boundaries than inside of the canopy.
1557	!-- For the same reason, the lad at the northmost(j+1) canopy
1558	!-- boundary on the v-grid equals lad_s(k,j,i).
1559	lad_local = lad_s(kk,j,i)
1560	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j-1,i) > 0.0_wp )&
1561	THEN
1562	lad_local = lad_s(kk,j-1,i)
1563	ENDIF
1564
1565	pre_tend = 0.0_wp
1566	pre_v = 0.0_wp
1567	!
1568	!-- Calculate preliminary value (pre_tend) of the tendency
1569	pre_tend = - cdc * &
1570	lad_local * &
1571	SQRT( ( 0.25_wp * ( u(k,j-1,i) + &
1572	u(k,j-1,i+1) + &
1573	u(k,j,i) + &
1574	u(k,j,i+1) ) &
1575	)**2 + &
1576	v(k,j,i)**2 + &
1577	( 0.25_wp * ( w(k-1,j-1,i) + &
1578	w(k-1,j,i) + &
1579	w(k,j-1,i) + &
1580	w(k,j,i) ) &
1581	)**2 &
1582	) * &
1583	v(k,j,i)
1584
1585	!
1586	!-- Calculate preliminary new velocity, based on pre_tend
1587	pre_v = v(k,j,i) + dt_3d * pre_tend
1588	!
1589	!-- Compare sign of old velocity and new preliminary velocity,
1590	!-- and in case the signs are different, limit the tendency
1591	IF ( SIGN(pre_v,v(k,j,i)) /= pre_v ) THEN
1592	pre_tend = - v(k,j,i) * ddt_3d
1593	ELSE
1594	pre_tend = pre_tend
1595	ENDIF
1596	!
1597	!-- Calculate final tendency
1598	tend(k,j,i) = tend(k,j,i) + pre_tend
1599
1600	ENDDO
1601	ENDDO
1602	ENDDO
1603
1604	!
1605	!-- w-component
1606	CASE ( 3 )
1607	DO i = nxl, nxr
1608	DO j = nys, nyn
1609	!
1610	!-- Determine topography-top index on w-grid
1611	k_wall = get_topography_top_index_ji( j, i, 'w' )
1612
1613	DO k = k_wall+1, k_wall + pch_index_ji(j,i) - 1
1614
1615	kk = k - k_wall !- lad arrays are defined flat
1616
1617	pre_tend = 0.0_wp
1618	pre_w = 0.0_wp
1619	!
1620	!-- Calculate preliminary value (pre_tend) of the tendency
1621	pre_tend = - cdc * &
1622	(0.5_wp * &
1623	( lad_s(kk+1,j,i) + lad_s(kk,j,i) )) * &
1624	SQRT( ( 0.25_wp * ( u(k,j,i) + &
1625	u(k,j,i+1) + &
1626	u(k+1,j,i) + &
1627	u(k+1,j,i+1) ) &
1628	)**2 + &
1629	( 0.25_wp * ( v(k,j,i) + &
1630	v(k,j+1,i) + &
1631	v(k+1,j,i) + &
1632	v(k+1,j+1,i) ) &
1633	)**2 + &
1634	w(k,j,i)**2 &
1635	) * &
1636	w(k,j,i)
1637	!
1638	!-- Calculate preliminary new velocity, based on pre_tend
1639	pre_w = w(k,j,i) + dt_3d * pre_tend
1640	!
1641	!-- Compare sign of old velocity and new preliminary velocity,
1642	!-- and in case the signs are different, limit the tendency
1643	IF ( SIGN(pre_w,w(k,j,i)) /= pre_w ) THEN
1644	pre_tend = - w(k,j,i) * ddt_3d
1645	ELSE
1646	pre_tend = pre_tend
1647	ENDIF
1648	!
1649	!-- Calculate final tendency
1650	tend(k,j,i) = tend(k,j,i) + pre_tend
1651
1652	ENDDO
1653	ENDDO
1654	ENDDO
1655
1656	!
1657	!-- potential temperature
1658	CASE ( 4 )
1659	IF ( humidity ) THEN
1660	DO i = nxl, nxr
1661	DO j = nys, nyn
1662	!-- Determine topography-top index on scalar-grid
1663	k_wall = get_topography_top_index_ji( j, i, 's' )
1664	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1665	kk = k - k_wall !- lad arrays are defined flat
1666	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i) - pc_latent_rate(kk,j,i)
1667	ENDDO
1668	ENDDO
1669	ENDDO
1670	ELSE
1671	DO i = nxl, nxr
1672	DO j = nys, nyn
1673	!-- Determine topography-top index on scalar-grid
1674	k_wall = get_topography_top_index_ji( j, i, 's' )
1675	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1676	kk = k - k_wall !- lad arrays are defined flat
1677	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i)
1678	ENDDO
1679	ENDDO
1680	ENDDO
1681	ENDIF
1682
1683	!
1684	!-- humidity
1685	CASE ( 5 )
1686	DO i = nxl, nxr
1687	DO j = nys, nyn
1688	!
1689	!-- Determine topography-top index on scalar-grid
1690	k_wall = get_topography_top_index_ji( j, i, 's' )
1691
1692	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1693
1694	kk = k - k_wall !- lad arrays are defined flat
1695
1696	IF ( .NOT. plant_canopy_transpiration ) THEN
1697	! pc_transpiration_rate is calculated in radiation model
1698	! in case of plant_canopy_transpiration = .T.
1699	! to include also the dependecy to the radiation
1700	! in the plant canopy box
1701	pc_transpiration_rate(kk,j,i) = - lsec &
1702	* lad_s(kk,j,i) * &
1703	SQRT( ( 0.5_wp * ( u(k,j,i) + &
1704	u(k,j,i+1) ) &
1705	)**2 + &
1706	( 0.5_wp * ( v(k,j,i) + &
1707	v(k,j+1,i) ) &
1708	)**2 + &
1709	( 0.5_wp * ( w(k-1,j,i) + &
1710	w(k,j,i) ) &
1711	)**2 &
1712	) * &
1713	( q(k,j,i) - lsc )
1714	ENDIF
1715
1716	tend(k,j,i) = tend(k,j,i) + pc_transpiration_rate(kk,j,i)
1717	ENDDO
1718	ENDDO
1719	ENDDO
1720
1721	!
1722	!-- sgs-tke
1723	CASE ( 6 )
1724	DO i = nxl, nxr
1725	DO j = nys, nyn
1726	!
1727	!-- Determine topography-top index on scalar-grid
1728	k_wall = get_topography_top_index_ji( j, i, 's' )
1729
1730	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1731
1732	kk = k - k_wall !- lad arrays are defined flat
1733	tend(k,j,i) = tend(k,j,i) - &
1734	2.0_wp * cdc * &
1735	lad_s(kk,j,i) * &
1736	SQRT( ( 0.5_wp * ( u(k,j,i) + &
1737	u(k,j,i+1) ) &
1738	)**2 + &
1739	( 0.5_wp * ( v(k,j,i) + &
1740	v(k,j+1,i) ) &
1741	)**2 + &
1742	( 0.5_wp * ( w(k,j,i) + &
1743	w(k+1,j,i) ) &
1744	)**2 &
1745	) * &
1746	e(k,j,i)
1747	ENDDO
1748	ENDDO
1749	ENDDO
1750	!
1751	!-- scalar concentration
1752	CASE ( 7 )
1753	DO i = nxl, nxr
1754	DO j = nys, nyn
1755	!
1756	!-- Determine topography-top index on scalar-grid
1757	k_wall = get_topography_top_index_ji( j, i, 's' )
1758
1759	DO k = k_wall+1, k_wall + pch_index_ji(j,i)
1760
1761	kk = k - k_wall !- lad arrays are defined flat
1762	tend(k,j,i) = tend(k,j,i) - &
1763	lsec * &
1764	lad_s(kk,j,i) * &
1765	SQRT( ( 0.5_wp * ( u(k,j,i) + &
1766	u(k,j,i+1) ) &
1767	)**2 + &
1768	( 0.5_wp * ( v(k,j,i) + &
1769	v(k,j+1,i) ) &
1770	)**2 + &
1771	( 0.5_wp * ( w(k-1,j,i) + &
1772	w(k,j,i) ) &
1773	)**2 &
1774	) * &
1775	( s(k,j,i) - lsc )
1776	ENDDO
1777	ENDDO
1778	ENDDO
1779
1780
1781
1782	CASE DEFAULT
1783
1784	WRITE( message_string, * ) 'wrong component: ', component
1785	CALL message( 'pcm_tendency', 'PA0279', 1, 2, 0, 6, 0 )
1786
1787	END SELECT
1788
1789	END SUBROUTINE pcm_tendency
1790
1791
1792	!------------------------------------------------------------------------------!
1793	! Description:
1794	! ------------
1795	!> Calculation of the tendency terms, accounting for the effect of the plant
1796	!> canopy on momentum and scalar quantities.
1797	!>
1798	!> The canopy is located where the leaf area density lad_s(k,j,i) > 0.0
1799	!> (defined on scalar grid), as initialized in subroutine pcm_init.
1800	!> The lad on the w-grid is vertically interpolated from the surrounding
1801	!> lad_s. The upper boundary of the canopy is defined on the w-grid at
1802	!> k = pch_index. Here, the lad is zero.
1803	!>
1804	!> The canopy drag must be limited (previously accounted for by calculation of
1805	!> a limiting canopy timestep for the determination of the maximum LES timestep
1806	!> in subroutine timestep), since it is physically impossible that the canopy
1807	!> drag alone can locally change the sign of a velocity component. This
1808	!> limitation is realized by calculating preliminary tendencies and velocities.
1809	!> It is subsequently checked if the preliminary new velocity has a different
1810	!> sign than the current velocity. If so, the tendency is limited in a way that
1811	!> the velocity can at maximum be reduced to zero by the canopy drag.
1812	!>
1813	!>
1814	!> Call for grid point i,j
1815	!------------------------------------------------------------------------------!
1816	SUBROUTINE pcm_tendency_ij( i, j, component )
1817
1818
1819	USE control_parameters, &
1820	ONLY: dt_3d, message_string
1821
1822	USE kinds
1823
1824	IMPLICIT NONE
1825
1826	INTEGER(iwp) :: component !< prognostic variable (u,v,w,pt,q,e)
1827	INTEGER(iwp) :: i !< running index
1828	INTEGER(iwp) :: j !< running index
1829	INTEGER(iwp) :: k !< running index
1830	INTEGER(iwp) :: k_wall !< vertical index of topography top
1831	INTEGER(iwp) :: kk !< running index for flat lad arrays
1832
1833	REAL(wp) :: ddt_3d !< inverse of the LES timestep (dt_3d)
1834	REAL(wp) :: lad_local !< local lad value
1835	REAL(wp) :: pre_tend !< preliminary tendency
1836	REAL(wp) :: pre_u !< preliminary u-value
1837	REAL(wp) :: pre_v !< preliminary v-value
1838	REAL(wp) :: pre_w !< preliminary w-value
1839
1840
1841	ddt_3d = 1.0_wp / dt_3d
1842	!
1843	!-- Compute drag for the three velocity components and the SGS-TKE
1844	SELECT CASE ( component )
1845
1846	!
1847	!-- u-component
1848	CASE ( 1 )
1849	!
1850	!-- Determine topography-top index on u-grid
1851	k_wall = get_topography_top_index_ji( j, i, 'u' )
1852	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
1853
1854	kk = k - k_wall !- lad arrays are defined flat
1855
1856	!
1857	!-- In order to create sharp boundaries of the plant canopy,
1858	!-- the lad on the u-grid at index (k,j,i) is equal to lad_s(k,j,i),
1859	!-- rather than being interpolated from the surrounding lad_s,
1860	!-- because this would yield smaller lad at the canopy boundaries
1861	!-- than inside of the canopy.
1862	!-- For the same reason, the lad at the rightmost(i+1)canopy
1863	!-- boundary on the u-grid equals lad_s(k,j,i).
1864	lad_local = lad_s(kk,j,i)
1865	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j,i-1) > 0.0_wp ) THEN
1866	lad_local = lad_s(kk,j,i-1)
1867	ENDIF
1868
1869	pre_tend = 0.0_wp
1870	pre_u = 0.0_wp
1871	!
1872	!-- Calculate preliminary value (pre_tend) of the tendency
1873	pre_tend = - cdc * &
1874	lad_local * &
1875	SQRT( u(k,j,i)**2 + &
1876	( 0.25_wp * ( v(k,j,i-1) + &
1877	v(k,j,i) + &
1878	v(k,j+1,i) + &
1879	v(k,j+1,i-1) ) &
1880	)**2 + &
1881	( 0.25_wp * ( w(k-1,j,i-1) + &
1882	w(k-1,j,i) + &
1883	w(k,j,i-1) + &
1884	w(k,j,i) ) &
1885	)**2 &
1886	) * &
1887	u(k,j,i)
1888
1889	!
1890	!-- Calculate preliminary new velocity, based on pre_tend
1891	pre_u = u(k,j,i) + dt_3d * pre_tend
1892	!
1893	!-- Compare sign of old velocity and new preliminary velocity,
1894	!-- and in case the signs are different, limit the tendency
1895	IF ( SIGN(pre_u,u(k,j,i)) /= pre_u ) THEN
1896	pre_tend = - u(k,j,i) * ddt_3d
1897	ELSE
1898	pre_tend = pre_tend
1899	ENDIF
1900	!
1901	!-- Calculate final tendency
1902	tend(k,j,i) = tend(k,j,i) + pre_tend
1903	ENDDO
1904
1905
1906	!
1907	!-- v-component
1908	CASE ( 2 )
1909	!
1910	!-- Determine topography-top index on v-grid
1911	k_wall = get_topography_top_index_ji( j, i, 'v' )
1912
1913	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
1914
1915	kk = k - k_wall !- lad arrays are defined flat
1916	!
1917	!-- In order to create sharp boundaries of the plant canopy,
1918	!-- the lad on the v-grid at index (k,j,i) is equal to lad_s(k,j,i),
1919	!-- rather than being interpolated from the surrounding lad_s,
1920	!-- because this would yield smaller lad at the canopy boundaries
1921	!-- than inside of the canopy.
1922	!-- For the same reason, the lad at the northmost(j+1)canopy
1923	!-- boundary on the v-grid equals lad_s(k,j,i).
1924	lad_local = lad_s(kk,j,i)
1925	IF ( lad_local == 0.0_wp .AND. lad_s(kk,j-1,i) > 0.0_wp ) THEN
1926	lad_local = lad_s(kk,j-1,i)
1927	ENDIF
1928
1929	pre_tend = 0.0_wp
1930	pre_v = 0.0_wp
1931	!
1932	!-- Calculate preliminary value (pre_tend) of the tendency
1933	pre_tend = - cdc * &
1934	lad_local * &
1935	SQRT( ( 0.25_wp * ( u(k,j-1,i) + &
1936	u(k,j-1,i+1) + &
1937	u(k,j,i) + &
1938	u(k,j,i+1) ) &
1939	)**2 + &
1940	v(k,j,i)**2 + &
1941	( 0.25_wp * ( w(k-1,j-1,i) + &
1942	w(k-1,j,i) + &
1943	w(k,j-1,i) + &
1944	w(k,j,i) ) &
1945	)**2 &
1946	) * &
1947	v(k,j,i)
1948
1949	!
1950	!-- Calculate preliminary new velocity, based on pre_tend
1951	pre_v = v(k,j,i) + dt_3d * pre_tend
1952	!
1953	!-- Compare sign of old velocity and new preliminary velocity,
1954	!-- and in case the signs are different, limit the tendency
1955	IF ( SIGN(pre_v,v(k,j,i)) /= pre_v ) THEN
1956	pre_tend = - v(k,j,i) * ddt_3d
1957	ELSE
1958	pre_tend = pre_tend
1959	ENDIF
1960	!
1961	!-- Calculate final tendency
1962	tend(k,j,i) = tend(k,j,i) + pre_tend
1963	ENDDO
1964
1965
1966	!
1967	!-- w-component
1968	CASE ( 3 )
1969	!
1970	!-- Determine topography-top index on w-grid
1971	k_wall = get_topography_top_index_ji( j, i, 'w' )
1972
1973	DO k = k_wall + 1, k_wall + pch_index_ji(j,i) - 1
1974
1975	kk = k - k_wall !- lad arrays are defined flat
1976
1977	pre_tend = 0.0_wp
1978	pre_w = 0.0_wp
1979	!
1980	!-- Calculate preliminary value (pre_tend) of the tendency
1981	pre_tend = - cdc * &
1982	(0.5_wp * &
1983	( lad_s(kk+1,j,i) + lad_s(kk,j,i) )) * &
1984	SQRT( ( 0.25_wp * ( u(k,j,i) + &
1985	u(k,j,i+1) + &
1986	u(k+1,j,i) + &
1987	u(k+1,j,i+1) ) &
1988	)**2 + &
1989	( 0.25_wp * ( v(k,j,i) + &
1990	v(k,j+1,i) + &
1991	v(k+1,j,i) + &
1992	v(k+1,j+1,i) ) &
1993	)**2 + &
1994	w(k,j,i)**2 &
1995	) * &
1996	w(k,j,i)
1997	!
1998	!-- Calculate preliminary new velocity, based on pre_tend
1999	pre_w = w(k,j,i) + dt_3d * pre_tend
2000	!
2001	!-- Compare sign of old velocity and new preliminary velocity,
2002	!-- and in case the signs are different, limit the tendency
2003	IF ( SIGN(pre_w,w(k,j,i)) /= pre_w ) THEN
2004	pre_tend = - w(k,j,i) * ddt_3d
2005	ELSE
2006	pre_tend = pre_tend
2007	ENDIF
2008	!
2009	!-- Calculate final tendency
2010	tend(k,j,i) = tend(k,j,i) + pre_tend
2011	ENDDO
2012
2013	!
2014	!-- potential temperature
2015	CASE ( 4 )
2016	!
2017	!-- Determine topography-top index on scalar grid
2018	k_wall = get_topography_top_index_ji( j, i, 's' )
2019
2020	IF ( humidity ) THEN
2021	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2022	kk = k - k_wall !- lad arrays are defined flat
2023	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i) - &
2024	pc_latent_rate(kk,j,i)
2025	ENDDO
2026	ELSE
2027	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2028	kk = k - k_wall !- lad arrays are defined flat
2029	tend(k,j,i) = tend(k,j,i) + pc_heating_rate(kk,j,i)
2030	ENDDO
2031	ENDIF
2032
2033	!
2034	!-- humidity
2035	CASE ( 5 )
2036	!
2037	!-- Determine topography-top index on scalar grid
2038	k_wall = get_topography_top_index_ji( j, i, 's' )
2039
2040	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2041	kk = k - k_wall !- lad arrays are defined flat
2042	IF ( .NOT. plant_canopy_transpiration ) THEN
2043	! pc_transpiration_rate is calculated in radiation model
2044	! in case of plant_canopy_transpiration = .T.
2045	! to include also the dependecy to the radiation
2046	! in the plant canopy box
2047	pc_transpiration_rate(kk,j,i) = - lsec &
2048	* lad_s(kk,j,i) * &
2049	SQRT( ( 0.5_wp * ( u(k,j,i) + &
2050	u(k,j,i+1) ) &
2051	)**2 + &
2052	( 0.5_wp * ( v(k,j,i) + &
2053	v(k,j+1,i) ) &
2054	)**2 + &
2055	( 0.5_wp * ( w(k-1,j,i) + &
2056	w(k,j,i) ) &
2057	)**2 &
2058	) * &
2059	( q(k,j,i) - lsc )
2060	ENDIF
2061
2062	tend(k,j,i) = tend(k,j,i) + pc_transpiration_rate(kk,j,i)
2063
2064	ENDDO
2065
2066	!
2067	!-- sgs-tke
2068	CASE ( 6 )
2069	!
2070	!-- Determine topography-top index on scalar grid
2071	k_wall = get_topography_top_index_ji( j, i, 's' )
2072
2073	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2074
2075	kk = k - k_wall
2076	tend(k,j,i) = tend(k,j,i) - &
2077	2.0_wp * cdc * &
2078	lad_s(kk,j,i) * &
2079	SQRT( ( 0.5_wp * ( u(k,j,i) + &
2080	u(k,j,i+1) ) &
2081	)**2 + &
2082	( 0.5_wp * ( v(k,j,i) + &
2083	v(k,j+1,i) ) &
2084	)**2 + &
2085	( 0.5_wp * ( w(k,j,i) + &
2086	w(k+1,j,i) ) &
2087	)**2 &
2088	) * &
2089	e(k,j,i)
2090	ENDDO
2091
2092	!
2093	!-- scalar concentration
2094	CASE ( 7 )
2095	!
2096	!-- Determine topography-top index on scalar grid
2097	k_wall = get_topography_top_index_ji( j, i, 's' )
2098
2099	DO k = k_wall + 1, k_wall + pch_index_ji(j,i)
2100
2101	kk = k - k_wall
2102	tend(k,j,i) = tend(k,j,i) - &
2103	lsec * &
2104	lad_s(kk,j,i) * &
2105	SQRT( ( 0.5_wp * ( u(k,j,i) + &
2106	u(k,j,i+1) ) &
2107	)**2 + &
2108	( 0.5_wp * ( v(k,j,i) + &
2109	v(k,j+1,i) ) &
2110	)**2 + &
2111	( 0.5_wp * ( w(k-1,j,i) + &
2112	w(k,j,i) ) &
2113	)**2 &
2114	) * &
2115	( s(k,j,i) - lsc )
2116	ENDDO
2117
2118	CASE DEFAULT
2119
2120	WRITE( message_string, * ) 'wrong component: ', component
2121	CALL message( 'pcm_tendency', 'PA0279', 1, 2, 0, 6, 0 )
2122
2123	END SELECT
2124
2125	END SUBROUTINE pcm_tendency_ij
2126
2127
2128
2129	END MODULE plant_canopy_model_mod

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