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source: palm/trunk/SOURCE/lpm_init.f90 @ 2282

Last change on this file since 2282 was 2274, checked in by Giersch, 7 years ago
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1	!> @file lpm_init.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of PALM.
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 1997-2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: lpm_init.f90 2274 2017-06-09 13:27:48Z schwenkel $
27	! Changed error messages
28	!
29	! 2265 2017-06-08 16:58:28Z schwenkel
30	! Unused variables removed.
31	!
32	! 2263 2017-06-08 14:59:01Z schwenkel
33	! Implemented splitting and merging algorithm
34	!
35	! 2233 2017-05-30 18:08:54Z suehring
36	!
37	! 2232 2017-05-30 17:47:52Z suehring
38	! Adjustments according to new topography realization
39	!
40	!
41	! 2223 2017-05-15 16:38:09Z suehring
42	! Add check for particle release at model top
43	!
44	! 2182 2017-03-17 14:27:40Z schwenkel
45	! Added parameters for simplified particle initialization.
46	!
47	! 2122 2017-01-18 12:22:54Z hoffmann
48	! Improved initialization of equilibrium aerosol radii
49	! Calculation of particle ID
50	!
51	! 2000 2016-08-20 18:09:15Z knoop
52	! Forced header and separation lines into 80 columns
53	!
54	! 2016-06-09 16:25:25Z suehring
55	! Bugfix in determining initial particle height and grid index in case of
56	! seed_follows_topography.
57	! Bugfix concerning random positions, ensure that particles do not move more
58	! than one grid length.
59	! Bugfix logarithmic interpolation.
60	! Initial setting of sgs_wf_part.
61	!
62	! 1890 2016-04-22 08:52:11Z hoffmann
63	! Initialization of aerosol equilibrium radius not possible in supersaturated
64	! environments. Therefore, a maximum supersaturation of -1 % is assumed during
65	! initialization.
66	!
67	! 1873 2016-04-18 14:50:06Z maronga
68	! Module renamed (removed _mod
69	!
70	! 1871 2016-04-15 11:46:09Z hoffmann
71	! Initialization of aerosols added.
72	!
73	! 1850 2016-04-08 13:29:27Z maronga
74	! Module renamed
75	!
76	! 1831 2016-04-07 13:15:51Z hoffmann
77	! curvature_solution_effects moved to particle_attributes
78	!
79	! 1822 2016-04-07 07:49:42Z hoffmann
80	! Unused variables removed.
81	!
82	! 1783 2016-03-06 18:36:17Z raasch
83	! netcdf module added
84	!
85	! 1725 2015-11-17 13:01:51Z hoffmann
86	! Bugfix: Processor-dependent seed for random function is generated before it is
87	! used.
88	!
89	! 1691 2015-10-26 16:17:44Z maronga
90	! Renamed prandtl_layer to constant_flux_layer.
91	!
92	! 1685 2015-10-08 07:32:13Z raasch
93	! bugfix concerning vertical index offset in case of ocean
94	!
95	! 1682 2015-10-07 23:56:08Z knoop
96	! Code annotations made doxygen readable
97	!
98	! 1575 2015-03-27 09:56:27Z raasch
99	! initial vertical particle position is allowed to follow the topography
100	!
101	! 1359 2014-04-11 17:15:14Z hoffmann
102	! New particle structure integrated.
103	! Kind definition added to all floating point numbers.
104	! lpm_init changed form a subroutine to a module.
105	!
106	! 1327 2014-03-21 11:00:16Z raasch
107	! -netcdf_output
108	!
109	! 1322 2014-03-20 16:38:49Z raasch
110	! REAL functions provided with KIND-attribute
111	!
112	! 1320 2014-03-20 08:40:49Z raasch
113	! ONLY-attribute added to USE-statements,
114	! kind-parameters added to all INTEGER and REAL declaration statements,
115	! kinds are defined in new module kinds,
116	! revision history before 2012 removed,
117	! comment fields (!:) to be used for variable explanations added to
118	! all variable declaration statements
119	! bugfix: #if defined( __parallel ) added
120	!
121	! 1314 2014-03-14 18:25:17Z suehring
122	! Vertical logarithmic interpolation of horizontal particle speed for particles
123	! between roughness height and first vertical grid level.
124	!
125	! 1092 2013-02-02 11:24:22Z raasch
126	! unused variables removed
127	!
128	! 1036 2012-10-22 13:43:42Z raasch
129	! code put under GPL (PALM 3.9)
130	!
131	! 849 2012-03-15 10:35:09Z raasch
132	! routine renamed: init_particles -> lpm_init
133	! de_dx, de_dy, de_dz are allocated here (instead of automatic arrays in
134	! advec_particles),
135	! sort_particles renamed lpm_sort_arrays, user_init_particles renamed lpm_init
136	!
137	! 828 2012-02-21 12:00:36Z raasch
138	! call of init_kernels, particle feature color renamed class
139	!
140	! 824 2012-02-17 09:09:57Z raasch
141	! particle attributes speed_x\|y\|z_sgs renamed rvar1\|2\|3,
142	! array particles implemented as pointer
143	!
144	! 667 2010-12-23 12:06:00Z suehring/gryschka
145	! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng for allocation
146	! of arrays.
147	!
148	! Revision 1.1 1999/11/25 16:22:38 raasch
149	! Initial revision
150	!
151	!
152	! Description:
153	! ------------
154	!> This routine initializes a set of particles and their attributes (position,
155	!> radius, ..) which are used by the Lagrangian particle model (see lpm).
156	!------------------------------------------------------------------------------!
157	MODULE lpm_init_mod
158
159
160	USE arrays_3d, &
161	ONLY: de_dx, de_dy, de_dz, zu, zw
162
163	USE control_parameters, &
164	ONLY: cloud_droplets, constant_flux_layer, current_timestep_number, &
165	dz, initializing_actions, message_string, ocean, simulated_time
166
167	USE grid_variables, &
168	ONLY: ddx, dx, ddy, dy
169
170	USE indices, &
171	ONLY: nx, nxl, nxlg, nxrg, nxr, ny, nyn, nys, nyng, nysg, nz, nzb, &
172	nzb_max, nzt, wall_flags_0
173
174	USE kinds
175
176	USE lpm_collision_kernels_mod, &
177	ONLY: init_kernels
178
179	USE netcdf_interface, &
180	ONLY: netcdf_data_format
181
182	USE particle_attributes, &
183	ONLY: alloc_factor, bc_par_b, bc_par_lr, bc_par_ns, bc_par_t, &
184	block_offset, block_offset_def, collision_kernel, &
185	curvature_solution_effects, density_ratio, grid_particles, &
186	isf,i_splitting_mode, initial_weighting_factor, ibc_par_b, &
187	ibc_par_lr, ibc_par_ns, ibc_par_t, iran_part, log_z_z0, &
188	max_number_of_particle_groups, min_nr_particle, &
189	mpi_particle_type, number_concentration, &
190	number_particles_per_gridbox, number_of_particles, &
191	number_of_particle_groups, number_of_sublayers, &
192	offset_ocean_nzt, offset_ocean_nzt_m1, &
193	particles, particle_advection_start, particle_groups, &
194	particle_groups_type, particles_per_point, &
195	particle_type, pdx, pdy, pdz, prt_count, psb, psl, psn, psr, &
196	pss, pst, radius, random_start_position, &
197	read_particles_from_restartfile, seed_follows_topography, &
198	sgs_wf_part, sort_count, splitting_function, splitting_mode, &
199	total_number_of_particles, use_sgs_for_particles, &
200	write_particle_statistics, zero_particle, z0_av_global
201
202	USE pegrid
203
204	USE random_function_mod, &
205	ONLY: random_function
206
207	USE surface_mod, &
208	ONLY: surf_def_h, surf_lsm_h, surf_usm_h
209
210	IMPLICIT NONE
211
212	PRIVATE
213
214	INTEGER(iwp), PARAMETER :: PHASE_INIT = 1 !<
215	INTEGER(iwp), PARAMETER, PUBLIC :: PHASE_RELEASE = 2 !<
216
217	INTERFACE lpm_init
218	MODULE PROCEDURE lpm_init
219	END INTERFACE lpm_init
220
221	INTERFACE lpm_create_particle
222	MODULE PROCEDURE lpm_create_particle
223	END INTERFACE lpm_create_particle
224
225	PUBLIC lpm_init, lpm_create_particle
226
227	CONTAINS
228
229	!------------------------------------------------------------------------------!
230	! Description:
231	! ------------
232	!> @todo Missing subroutine description.
233	!------------------------------------------------------------------------------!
234	SUBROUTINE lpm_init
235
236	USE lpm_collision_kernels_mod, &
237	ONLY: init_kernels
238
239	IMPLICIT NONE
240
241	INTEGER(iwp) :: i !<
242	INTEGER(iwp) :: j !<
243	INTEGER(iwp) :: k !<
244
245	#if defined( __parallel )
246	INTEGER(iwp), DIMENSION(3) :: blocklengths !<
247	INTEGER(iwp), DIMENSION(3) :: displacements !<
248	INTEGER(iwp), DIMENSION(3) :: types !<
249	#endif
250
251	REAL(wp) :: div !<
252	REAL(wp) :: height_int !<
253	REAL(wp) :: height_p !<
254	REAL(wp) :: z_p !<
255	REAL(wp) :: z0_av_local !<
256
257	#if defined( __parallel )
258	!
259	!-- Define MPI derived datatype for FORTRAN datatype particle_type (see module
260	!-- particle_attributes). Integer length is 4 byte, Real is 8 byte
261	blocklengths(1) = 19; blocklengths(2) = 6; blocklengths(3) = 1
262	displacements(1) = 0; displacements(2) = 152; displacements(3) = 176
263
264	types(1) = MPI_REAL
265	types(2) = MPI_INTEGER
266	types(3) = MPI_UB
267	CALL MPI_TYPE_STRUCT( 3, blocklengths, displacements, types, &
268	mpi_particle_type, ierr )
269	CALL MPI_TYPE_COMMIT( mpi_particle_type, ierr )
270	#endif
271
272	!
273	!-- In case of oceans runs, the vertical index calculations need an offset,
274	!-- because otherwise the k indices will become negative
275	IF ( ocean ) THEN
276	offset_ocean_nzt = nzt
277	offset_ocean_nzt_m1 = nzt - 1
278	ENDIF
279
280	!
281	!-- Define block offsets for dividing a gridcell in 8 sub cells
282
283	block_offset(0) = block_offset_def (-1,-1,-1)
284	block_offset(1) = block_offset_def (-1,-1, 0)
285	block_offset(2) = block_offset_def (-1, 0,-1)
286	block_offset(3) = block_offset_def (-1, 0, 0)
287	block_offset(4) = block_offset_def ( 0,-1,-1)
288	block_offset(5) = block_offset_def ( 0,-1, 0)
289	block_offset(6) = block_offset_def ( 0, 0,-1)
290	block_offset(7) = block_offset_def ( 0, 0, 0)
291	!
292	!-- Check the number of particle groups.
293	IF ( number_of_particle_groups > max_number_of_particle_groups ) THEN
294	WRITE( message_string, * ) 'max_number_of_particle_groups =', &
295	max_number_of_particle_groups , &
296	'&number_of_particle_groups reset to ', &
297	max_number_of_particle_groups
298	CALL message( 'lpm_init', 'PA0213', 0, 1, 0, 6, 0 )
299	number_of_particle_groups = max_number_of_particle_groups
300	ENDIF
301	!
302	!-- Check if downward-facing walls exist. This case, reflection boundary
303	!-- conditions (as well as subgrid-scale velocities) may do not work
304	!-- propably (not realized so far).
305	IF ( surf_def_h(1)%ns >= 1 ) THEN
306	WRITE( message_string, * ) 'Overhanging topography do not work '// &
307	'with particles'
308	CALL message( 'lpm_init', 'PA0212', 0, 1, 0, 6, 0 )
309
310	ENDIF
311
312	!
313	!-- Set default start positions, if necessary
314	IF ( psl(1) == 9999999.9_wp ) psl(1) = -0.5_wp * dx
315	IF ( psr(1) == 9999999.9_wp ) psr(1) = ( nx + 0.5_wp ) * dx
316	IF ( pss(1) == 9999999.9_wp ) pss(1) = -0.5_wp * dy
317	IF ( psn(1) == 9999999.9_wp ) psn(1) = ( ny + 0.5_wp ) * dy
318	IF ( psb(1) == 9999999.9_wp ) psb(1) = zu(nz/2)
319	IF ( pst(1) == 9999999.9_wp ) pst(1) = psb(1)
320
321	IF ( pdx(1) == 9999999.9_wp .OR. pdx(1) == 0.0_wp ) pdx(1) = dx
322	IF ( pdy(1) == 9999999.9_wp .OR. pdy(1) == 0.0_wp ) pdy(1) = dy
323	IF ( pdz(1) == 9999999.9_wp .OR. pdz(1) == 0.0_wp ) pdz(1) = zu(2) - zu(1)
324
325	!
326	!-- If number_particles_per_gridbox is set, the parametres pdx, pdy and pdz are
327	!-- calculated diagnostically. Therfore an isotropic distribution is prescribed.
328	IF ( number_particles_per_gridbox /= -1 .AND. &
329	number_particles_per_gridbox >= 1 ) THEN
330	pdx(1) = (( dx * dy * ( zu(2) - zu(1) ) ) / &
331	REAL(number_particles_per_gridbox))**0.3333333_wp
332	!
333	!-- Ensure a smooth value (two significant digits) of distance between
334	!-- particles (pdx, pdy, pdz).
335	div = 1000.0_wp
336	DO WHILE ( pdx(1) < div )
337	div = div / 10.0_wp
338	ENDDO
339	pdx(1) = NINT( pdx(1) * 100.0_wp / div ) * div / 100.0_wp
340	pdy(1) = pdx(1)
341	pdz(1) = pdx(1)
342
343	ENDIF
344
345	DO j = 2, number_of_particle_groups
346	IF ( psl(j) == 9999999.9_wp ) psl(j) = psl(j-1)
347	IF ( psr(j) == 9999999.9_wp ) psr(j) = psr(j-1)
348	IF ( pss(j) == 9999999.9_wp ) pss(j) = pss(j-1)
349	IF ( psn(j) == 9999999.9_wp ) psn(j) = psn(j-1)
350	IF ( psb(j) == 9999999.9_wp ) psb(j) = psb(j-1)
351	IF ( pst(j) == 9999999.9_wp ) pst(j) = pst(j-1)
352	IF ( pdx(j) == 9999999.9_wp .OR. pdx(j) == 0.0_wp ) pdx(j) = pdx(j-1)
353	IF ( pdy(j) == 9999999.9_wp .OR. pdy(j) == 0.0_wp ) pdy(j) = pdy(j-1)
354	IF ( pdz(j) == 9999999.9_wp .OR. pdz(j) == 0.0_wp ) pdz(j) = pdz(j-1)
355	ENDDO
356
357	!
358	!-- Allocate arrays required for calculating particle SGS velocities.
359	!-- Initialize prefactor required for stoachastic Weil equation.
360	IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN
361	ALLOCATE( de_dx(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
362	de_dy(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
363	de_dz(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
364
365	sgs_wf_part = 1.0_wp / 3.0_wp
366	ENDIF
367
368	!
369	!-- Allocate array required for logarithmic vertical interpolation of
370	!-- horizontal particle velocities between the surface and the first vertical
371	!-- grid level. In order to avoid repeated CPU cost-intensive CALLS of
372	!-- intrinsic FORTRAN procedure LOG(z/z0), LOG(z/z0) is precalculated for
373	!-- several heights. Splitting into 20 sublayers turned out to be sufficient.
374	!-- To obtain exact height levels of particles, linear interpolation is applied
375	!-- (see lpm_advec.f90).
376	IF ( constant_flux_layer ) THEN
377
378	ALLOCATE ( log_z_z0(0:number_of_sublayers) )
379	z_p = zu(nzb+1) - zw(nzb)
380
381	!
382	!-- Calculate horizontal mean value of z0 used for logartihmic
383	!-- interpolation. Note: this is not exact for heterogeneous z0.
384	!-- However, sensitivity studies showed that the effect is
385	!-- negligible.
386	z0_av_local = SUM( surf_def_h(0)%z0 ) + SUM( surf_lsm_h%z0 ) + &
387	SUM( surf_usm_h%z0 )
388	z0_av_global = 0.0_wp
389
390	#if defined( __parallel )
391	CALL MPI_ALLREDUCE(z0_av_local, z0_av_global, 1, MPI_REAL, MPI_SUM, &
392	comm2d, ierr )
393	#else
394	z0_av_global = z0_av_local
395	#endif
396
397	z0_av_global = z0_av_global / ( ( ny + 1 ) * ( nx + 1 ) )
398	!
399	!-- Horizontal wind speed is zero below and at z0
400	log_z_z0(0) = 0.0_wp
401	!
402	!-- Calculate vertical depth of the sublayers
403	height_int = ( z_p - z0_av_global ) / REAL( number_of_sublayers, KIND=wp )
404	!
405	!-- Precalculate LOG(z/z0)
406	height_p = z0_av_global
407	DO k = 1, number_of_sublayers
408
409	height_p = height_p + height_int
410	log_z_z0(k) = LOG( height_p / z0_av_global )
411
412	ENDDO
413
414	ENDIF
415
416	!
417	!-- Check boundary condition and set internal variables
418	SELECT CASE ( bc_par_b )
419
420	CASE ( 'absorb' )
421	ibc_par_b = 1
422
423	CASE ( 'reflect' )
424	ibc_par_b = 2
425
426	CASE DEFAULT
427	WRITE( message_string, * ) 'unknown boundary condition ', &
428	'bc_par_b = "', TRIM( bc_par_b ), '"'
429	CALL message( 'lpm_init', 'PA0217', 1, 2, 0, 6, 0 )
430
431	END SELECT
432	SELECT CASE ( bc_par_t )
433
434	CASE ( 'absorb' )
435	ibc_par_t = 1
436
437	CASE ( 'reflect' )
438	ibc_par_t = 2
439
440	CASE DEFAULT
441	WRITE( message_string, * ) 'unknown boundary condition ', &
442	'bc_par_t = "', TRIM( bc_par_t ), '"'
443	CALL message( 'lpm_init', 'PA0218', 1, 2, 0, 6, 0 )
444
445	END SELECT
446	SELECT CASE ( bc_par_lr )
447
448	CASE ( 'cyclic' )
449	ibc_par_lr = 0
450
451	CASE ( 'absorb' )
452	ibc_par_lr = 1
453
454	CASE ( 'reflect' )
455	ibc_par_lr = 2
456
457	CASE DEFAULT
458	WRITE( message_string, * ) 'unknown boundary condition ', &
459	'bc_par_lr = "', TRIM( bc_par_lr ), '"'
460	CALL message( 'lpm_init', 'PA0219', 1, 2, 0, 6, 0 )
461
462	END SELECT
463	SELECT CASE ( bc_par_ns )
464
465	CASE ( 'cyclic' )
466	ibc_par_ns = 0
467
468	CASE ( 'absorb' )
469	ibc_par_ns = 1
470
471	CASE ( 'reflect' )
472	ibc_par_ns = 2
473
474	CASE DEFAULT
475	WRITE( message_string, * ) 'unknown boundary condition ', &
476	'bc_par_ns = "', TRIM( bc_par_ns ), '"'
477	CALL message( 'lpm_init', 'PA0220', 1, 2, 0, 6, 0 )
478
479	END SELECT
480	SELECT CASE ( splitting_mode )
481
482	CASE ( 'const' )
483	i_splitting_mode = 1
484
485	CASE ( 'cl_av' )
486	i_splitting_mode = 2
487
488	CASE ( 'gb_av' )
489	i_splitting_mode = 3
490
491	CASE DEFAULT
492	WRITE( message_string, * ) 'unknown splitting condition ', &
493	'splitting_mode = "', TRIM( splitting_mode ), '"'
494	CALL message( 'lpm_init', 'PA0146', 1, 2, 0, 6, 0 )
495
496	END SELECT
497	SELECT CASE ( splitting_function )
498
499	CASE ( 'gamma' )
500	isf = 1
501
502	CASE ( 'log' )
503	isf = 2
504
505	CASE ( 'exp' )
506	isf = 3
507
508	CASE DEFAULT
509	WRITE( message_string, * ) 'unknown splitting function ', &
510	'splitting_function = "', TRIM( splitting_function ), '"'
511	CALL message( 'lpm_init', 'PA0147', 1, 2, 0, 6, 0 )
512
513	END SELECT
514
515
516	!
517	!-- Initialize collision kernels
518	IF ( collision_kernel /= 'none' ) CALL init_kernels
519
520	!
521	!-- For the first model run of a possible job chain initialize the
522	!-- particles, otherwise read the particle data from restart file.
523	IF ( TRIM( initializing_actions ) == 'read_restart_data' &
524	.AND. read_particles_from_restartfile ) THEN
525
526	CALL lpm_read_restart_file
527
528	ELSE
529
530	!
531	!-- Allocate particle arrays and set attributes of the initial set of
532	!-- particles, which can be also periodically released at later times.
533	ALLOCATE( prt_count(nzb:nzt+1,nysg:nyng,nxlg:nxrg), &
534	grid_particles(nzb+1:nzt,nys:nyn,nxl:nxr) )
535
536	number_of_particles = 0
537
538	sort_count = 0
539	prt_count = 0
540
541	!
542	!-- initialize counter for particle IDs
543	grid_particles%id_counter = 0
544
545	!
546	!-- Initialize all particles with dummy values (otherwise errors may
547	!-- occur within restart runs). The reason for this is still not clear
548	!-- and may be presumably caused by errors in the respective user-interface.
549	zero_particle = particle_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
550	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
551	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
552	0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, &
553	0, 0, 0, 0, .FALSE., -1 )
554
555	particle_groups = particle_groups_type( 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp )
556
557	!
558	!-- Set values for the density ratio and radius for all particle
559	!-- groups, if necessary
560	IF ( density_ratio(1) == 9999999.9_wp ) density_ratio(1) = 0.0_wp
561	IF ( radius(1) == 9999999.9_wp ) radius(1) = 0.0_wp
562	DO i = 2, number_of_particle_groups
563	IF ( density_ratio(i) == 9999999.9_wp ) THEN
564	density_ratio(i) = density_ratio(i-1)
565	ENDIF
566	IF ( radius(i) == 9999999.9_wp ) radius(i) = radius(i-1)
567	ENDDO
568
569	DO i = 1, number_of_particle_groups
570	IF ( density_ratio(i) /= 0.0_wp .AND. radius(i) == 0 ) THEN
571	WRITE( message_string, * ) 'particle group #', i, 'has a', &
572	'density ratio /= 0 but radius = 0'
573	CALL message( 'lpm_init', 'PA0215', 1, 2, 0, 6, 0 )
574	ENDIF
575	particle_groups(i)%density_ratio = density_ratio(i)
576	particle_groups(i)%radius = radius(i)
577	ENDDO
578
579	!
580	!-- Set a seed value for the random number generator to be exclusively
581	!-- used for the particle code. The generated random numbers should be
582	!-- different on the different PEs.
583	iran_part = iran_part + myid
584
585	CALL lpm_create_particle (PHASE_INIT)
586	!
587	!-- User modification of initial particles
588	CALL user_lpm_init
589
590	!
591	!-- Open file for statistical informations about particle conditions
592	IF ( write_particle_statistics ) THEN
593	CALL check_open( 80 )
594	WRITE ( 80, 8000 ) current_timestep_number, simulated_time, &
595	number_of_particles
596	CALL close_file( 80 )
597	ENDIF
598
599	ENDIF
600
601	!
602	!-- To avoid programm abort, assign particles array to the local version of
603	!-- first grid cell
604	number_of_particles = prt_count(nzb+1,nys,nxl)
605	particles => grid_particles(nzb+1,nys,nxl)%particles(1:number_of_particles)
606	!
607	!-- Formats
608	8000 FORMAT (I6,1X,F7.2,4X,I10,71X,I10)
609
610	END SUBROUTINE lpm_init
611
612	!------------------------------------------------------------------------------!
613	! Description:
614	! ------------
615	!> @todo Missing subroutine description.
616	!------------------------------------------------------------------------------!
617	SUBROUTINE lpm_create_particle (phase)
618
619	USE lpm_exchange_horiz_mod, &
620	ONLY: lpm_exchange_horiz, lpm_move_particle, realloc_particles_array
621
622	USE lpm_pack_arrays_mod, &
623	ONLY: lpm_pack_all_arrays
624
625	USE particle_attributes, &
626	ONLY: deleted_particles, monodisperse_aerosols
627
628	IMPLICIT NONE
629
630	INTEGER(iwp) :: alloc_size !< relative increase of allocated memory for particles
631	INTEGER(iwp) :: i !< loop variable ( particle groups )
632	INTEGER(iwp) :: ip !< index variable along x
633	INTEGER(iwp) :: j !< loop variable ( particles per point )
634	INTEGER(iwp) :: jp !< index variable along y
635	INTEGER(iwp) :: k !< index variable along z
636	INTEGER(iwp) :: k_surf !< index of surface grid point
637	INTEGER(iwp) :: kp !< index variable along z
638	INTEGER(iwp) :: loop_stride !< loop variable for initialization
639	INTEGER(iwp) :: n !< loop variable ( number of particles )
640	INTEGER(iwp) :: new_size !< new size of allocated memory for particles
641
642	INTEGER(iwp), INTENT(IN) :: phase !< mode of inititialization
643
644	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_count !< start address of new particle
645	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: local_start !< start address of new particle
646
647	LOGICAL :: first_stride !< flag for initialization
648
649	REAL(wp) :: pos_x !< increment for particle position in x
650	REAL(wp) :: pos_y !< increment for particle position in y
651	REAL(wp) :: pos_z !< increment for particle position in z
652	REAL(wp) :: rand_contr !< dummy argument for random position
653
654	TYPE(particle_type),TARGET :: tmp_particle !< temporary particle used for initialization
655
656	!
657	!-- Calculate particle positions and store particle attributes, if
658	!-- particle is situated on this PE
659	DO loop_stride = 1, 2
660	first_stride = (loop_stride == 1)
661	IF ( first_stride ) THEN
662	local_count = 0 ! count number of particles
663	ELSE
664	local_count = prt_count ! Start address of new particles
665	ENDIF
666
667	!
668	!-- Calculate initial_weighting_factor diagnostically
669	IF ( number_concentration /= -1.0_wp .AND. number_concentration > 0.0_wp ) THEN
670	initial_weighting_factor = number_concentration * 1.0E6_wp * &
671	pdx(1) * pdy(1) * pdz(1)
672	END IF
673
674	n = 0
675	DO i = 1, number_of_particle_groups
676
677	pos_z = psb(i)
678
679	DO WHILE ( pos_z <= pst(i) )
680
681	IF ( pos_z >= 0.0_wp .AND. pos_z < zw(nzt) ) THEN
682
683
684	pos_y = pss(i)
685
686	DO WHILE ( pos_y <= psn(i) )
687
688	IF ( pos_y >= ( nys - 0.5_wp ) * dy .AND. &
689	pos_y < ( nyn + 0.5_wp ) * dy ) THEN
690
691	pos_x = psl(i)
692
693	xloop: DO WHILE ( pos_x <= psr(i) )
694
695	IF ( pos_x >= ( nxl - 0.5_wp ) * dx .AND. &
696	pos_x < ( nxr + 0.5_wp ) * dx ) THEN
697
698	DO j = 1, particles_per_point
699
700	n = n + 1
701	tmp_particle%x = pos_x
702	tmp_particle%y = pos_y
703	tmp_particle%z = pos_z
704	tmp_particle%age = 0.0_wp
705	tmp_particle%age_m = 0.0_wp
706	tmp_particle%dt_sum = 0.0_wp
707	tmp_particle%user = 0.0_wp !unused, free for the user
708	tmp_particle%e_m = 0.0_wp
709	IF ( curvature_solution_effects ) THEN
710	!
711	!-- Initial values (internal timesteps, derivative)
712	!-- for Rosenbrock method
713	tmp_particle%rvar1 = 1.0E-6_wp !last Rosenbrock timestep
714	tmp_particle%rvar2 = 0.1E-6_wp !dry aerosol radius
715	tmp_particle%rvar3 = -9999999.9_wp !unused in this configuration
716	ELSE
717	!
718	!-- Initial values for SGS velocities
719	tmp_particle%rvar1 = 0.0_wp
720	tmp_particle%rvar2 = 0.0_wp
721	tmp_particle%rvar3 = 0.0_wp
722	ENDIF
723	tmp_particle%speed_x = 0.0_wp
724	tmp_particle%speed_y = 0.0_wp
725	tmp_particle%speed_z = 0.0_wp
726	tmp_particle%origin_x = pos_x
727	tmp_particle%origin_y = pos_y
728	tmp_particle%origin_z = pos_z
729	tmp_particle%radius = particle_groups(i)%radius
730	tmp_particle%weight_factor = initial_weighting_factor
731	tmp_particle%class = 1
732	tmp_particle%group = i
733	tmp_particle%id1 = 0
734	tmp_particle%id2 = 0
735	tmp_particle%particle_mask = .TRUE.
736	tmp_particle%block_nr = -1
737	!
738	!-- Determine the grid indices of the particle position
739	ip = ( tmp_particle%x + 0.5_wp * dx ) * ddx
740	jp = ( tmp_particle%y + 0.5_wp * dy ) * ddy
741	kp = tmp_particle%z / dz + 1 + offset_ocean_nzt
742	!
743	!-- Determine surface level. Therefore, check for
744	!-- upward-facing wall on w-grid. MAXLOC will return
745	!-- the index of the lowest upward-facing wall.
746	k_surf = MAXLOC( &
747	MERGE( 1, 0, &
748	BTEST( wall_flags_0(nzb:nzb_max,jp,ip), 18 )&
749	), DIM = 1 &
750	) - 1
751
752	IF ( seed_follows_topography ) THEN
753	!
754	!-- Particle height is given relative to topography
755	kp = kp + k_surf
756	tmp_particle%z = tmp_particle%z + zw(k_surf)
757	!-- Skip particle release if particle position is
758	!-- above model top, or within topography in case
759	!-- of overhanging structures.
760	IF ( kp > nzt .OR. &
761	.NOT. BTEST( wall_flags_0(kp,jp,ip), 0 ) ) THEN
762	pos_x = pos_x + pdx(i)
763	CYCLE xloop
764	ENDIF
765	!
766	!-- Skip particle release if particle position is
767	!-- below surface, or within topography in case
768	!-- of overhanging structures.
769	ELSEIF ( .NOT. seed_follows_topography .AND. &
770	tmp_particle%z <= zw(k_surf) .OR. &
771	.NOT. BTEST( wall_flags_0(kp,jp,ip), 0 ) )&
772	THEN
773	pos_x = pos_x + pdx(i)
774	CYCLE xloop
775	ENDIF
776
777	local_count(kp,jp,ip) = local_count(kp,jp,ip) + 1
778
779	IF ( .NOT. first_stride ) THEN
780	IF ( ip < nxl .OR. jp < nys .OR. kp < nzb+1 ) THEN
781	write(6,*) 'xl ',ip,jp,kp,nxl,nys,nzb+1
782	ENDIF
783	IF ( ip > nxr .OR. jp > nyn .OR. kp > nzt ) THEN
784	write(6,*) 'xu ',ip,jp,kp,nxr,nyn,nzt
785	ENDIF
786	grid_particles(kp,jp,ip)%particles(local_count(kp,jp,ip)) = tmp_particle
787
788	ENDIF
789	ENDDO
790
791	ENDIF
792
793	pos_x = pos_x + pdx(i)
794
795	ENDDO xloop
796
797	ENDIF
798
799	pos_y = pos_y + pdy(i)
800
801	ENDDO
802
803	ENDIF
804
805	pos_z = pos_z + pdz(i)
806
807	ENDDO
808
809	ENDDO
810
811	IF ( first_stride ) THEN
812	DO ip = nxl, nxr
813	DO jp = nys, nyn
814	DO kp = nzb+1, nzt
815	IF ( phase == PHASE_INIT ) THEN
816	IF ( local_count(kp,jp,ip) > 0 ) THEN
817	alloc_size = MAX( INT( local_count(kp,jp,ip) * &
818	( 1.0_wp + alloc_factor / 100.0_wp ) ), &
819	min_nr_particle )
820	ELSE
821	alloc_size = min_nr_particle
822	ENDIF
823	ALLOCATE(grid_particles(kp,jp,ip)%particles(1:alloc_size))
824	DO n = 1, alloc_size
825	grid_particles(kp,jp,ip)%particles(n) = zero_particle
826	ENDDO
827	ELSEIF ( phase == PHASE_RELEASE ) THEN
828	IF ( local_count(kp,jp,ip) > 0 ) THEN
829	new_size = local_count(kp,jp,ip) + prt_count(kp,jp,ip)
830	alloc_size = MAX( INT( new_size * ( 1.0_wp + &
831	alloc_factor / 100.0_wp ) ), min_nr_particle )
832	IF( alloc_size > SIZE( grid_particles(kp,jp,ip)%particles) ) THEN
833	CALL realloc_particles_array(ip,jp,kp,alloc_size)
834	ENDIF
835	ENDIF
836	ENDIF
837	ENDDO
838	ENDDO
839	ENDDO
840	ENDIF
841
842	ENDDO
843
844
845
846	local_start = prt_count+1
847	prt_count = local_count
848
849	!
850	!-- Calculate particle IDs
851	DO ip = nxl, nxr
852	DO jp = nys, nyn
853	DO kp = nzb+1, nzt
854	number_of_particles = prt_count(kp,jp,ip)
855	IF ( number_of_particles <= 0 ) CYCLE
856	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
857
858	DO n = local_start(kp,jp,ip), number_of_particles !only new particles
859
860	particles(n)%id1 = 10000_iwp * grid_particles(kp,jp,ip)%id_counter + kp
861	particles(n)%id2 = 10000_iwp * jp + ip
862
863	grid_particles(kp,jp,ip)%id_counter = &
864	grid_particles(kp,jp,ip)%id_counter + 1
865
866	ENDDO
867
868	ENDDO
869	ENDDO
870	ENDDO
871
872	!
873	!-- Initialize aerosol background spectrum
874	IF ( curvature_solution_effects .AND. .NOT. monodisperse_aerosols ) THEN
875	CALL lpm_init_aerosols(local_start)
876	ENDIF
877
878	!
879	!-- Add random fluctuation to particle positions.
880	IF ( random_start_position ) THEN
881	DO ip = nxl, nxr
882	DO jp = nys, nyn
883	DO kp = nzb+1, nzt
884	number_of_particles = prt_count(kp,jp,ip)
885	IF ( number_of_particles <= 0 ) CYCLE
886	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
887	!
888	!-- Move only new particles. Moreover, limit random fluctuation
889	!-- in order to prevent that particles move more than one grid box,
890	!-- which would lead to problems concerning particle exchange
891	!-- between processors in case pdx/pdy are larger than dx/dy,
892	!-- respectively.
893	DO n = local_start(kp,jp,ip), number_of_particles
894	IF ( psl(particles(n)%group) /= psr(particles(n)%group) ) THEN
895	rand_contr = ( random_function( iran_part ) - 0.5_wp ) * &
896	pdx(particles(n)%group)
897	particles(n)%x = particles(n)%x + &
898	MERGE( rand_contr, SIGN( dx, rand_contr ), &
899	ABS( rand_contr ) < dx &
900	)
901	ENDIF
902	IF ( pss(particles(n)%group) /= psn(particles(n)%group) ) THEN
903	rand_contr = ( random_function( iran_part ) - 0.5_wp ) * &
904	pdy(particles(n)%group)
905	particles(n)%y = particles(n)%y + &
906	MERGE( rand_contr, SIGN( dy, rand_contr ), &
907	ABS( rand_contr ) < dy &
908	)
909	ENDIF
910	IF ( psb(particles(n)%group) /= pst(particles(n)%group) ) THEN
911	rand_contr = ( random_function( iran_part ) - 0.5_wp ) * &
912	pdz(particles(n)%group)
913	particles(n)%z = particles(n)%z + &
914	MERGE( rand_contr, SIGN( dz, rand_contr ), &
915	ABS( rand_contr ) < dz &
916	)
917	ENDIF
918	ENDDO
919	!
920	!-- Identify particles located outside the model domain and reflect
921	!-- or absorb them if necessary.
922	CALL lpm_boundary_conds( 'bottom/top' )
923	!
924	!-- Furthermore, remove particles located in topography. Note, as
925	!-- the particle speed is still zero at this point, wall
926	!-- reflection boundary conditions will not work in this case.
927	particles => &
928	grid_particles(kp,jp,ip)%particles(1:number_of_particles)
929	DO n = local_start(kp,jp,ip), number_of_particles
930	i = ( particles(n)%x + 0.5_wp * dx ) * ddx
931	j = ( particles(n)%y + 0.5_wp * dy ) * ddy
932	k = particles(n)%z / dz + 1 + offset_ocean_nzt
933	!
934	!-- Check if particle is within topography
935	IF ( .NOT. BTEST( wall_flags_0(k,j,i), 0 ) ) THEN
936	particles(n)%particle_mask = .FALSE.
937	deleted_particles = deleted_particles + 1
938	ENDIF
939
940	ENDDO
941	ENDDO
942	ENDDO
943	ENDDO
944	!
945	!-- Exchange particles between grid cells and processors
946	CALL lpm_move_particle
947	CALL lpm_exchange_horiz
948
949	ENDIF
950	!
951	!-- In case of random_start_position, delete particles identified by
952	!-- lpm_exchange_horiz and lpm_boundary_conds. Then sort particles into blocks,
953	!-- which is needed for a fast interpolation of the LES fields on the particle
954	!-- position.
955	CALL lpm_pack_all_arrays
956
957	!
958	!-- Determine the current number of particles
959	DO ip = nxl, nxr
960	DO jp = nys, nyn
961	DO kp = nzb+1, nzt
962	number_of_particles = number_of_particles &
963	+ prt_count(kp,jp,ip)
964	ENDDO
965	ENDDO
966	ENDDO
967	!
968	!-- Calculate the number of particles of the total domain
969	#if defined( __parallel )
970	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
971	CALL MPI_ALLREDUCE( number_of_particles, total_number_of_particles, 1, &
972	MPI_INTEGER, MPI_SUM, comm2d, ierr )
973	#else
974	total_number_of_particles = number_of_particles
975	#endif
976
977	RETURN
978
979	END SUBROUTINE lpm_create_particle
980
981	SUBROUTINE lpm_init_aerosols(local_start)
982
983	USE arrays_3d, &
984	ONLY: hyp, pt, q
985
986	USE cloud_parameters, &
987	ONLY: l_d_rv, rho_l, r_v
988
989	USE constants, &
990	ONLY: pi
991
992	USE kinds
993
994	USE particle_attributes, &
995	ONLY: init_aerosol_probabilistic, molecular_weight_of_solute, &
996	molecular_weight_of_water, n1, n2, n3, rho_s, rm1, rm2, rm3, &
997	s1, s2, s3, vanthoff
998
999	IMPLICIT NONE
1000
1001	REAL(wp), DIMENSION(:), ALLOCATABLE :: cdf !< CDF of aerosol spectrum
1002	REAL(wp), DIMENSION(:), ALLOCATABLE :: r_temp !< dry aerosol radius spectrum
1003
1004	REAL(wp) :: afactor !< curvature effects
1005	REAL(wp) :: bfactor !< solute effects
1006	REAL(wp) :: dr !< width of radius bin
1007	REAL(wp) :: e_a !< vapor pressure
1008	REAL(wp) :: e_s !< saturation vapor pressure
1009	REAL(wp) :: n_init !< sum of all aerosol concentrations
1010	REAL(wp) :: pdf !< PDF of aerosol spectrum
1011	REAL(wp) :: rmin = 1.0e-8_wp !< minimum aerosol radius
1012	REAL(wp) :: rmax = 1.0e-6_wp !< maximum aerosol radius
1013	REAL(wp) :: rs_rand !< random number
1014	REAL(wp) :: r_mid !< mean radius
1015	REAL(wp) :: sigma !< surface tension
1016	REAL(wp) :: t_int !< temperature
1017	REAL(wp) :: weight_sum !< sum of all weighting factors
1018
1019	INTEGER(iwp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg), INTENT(IN) :: local_start !<
1020
1021	INTEGER(iwp) :: n !<
1022	INTEGER(iwp) :: nn !<
1023	INTEGER(iwp) :: no_bins = 999 !< number of bins
1024	INTEGER(iwp) :: ip !<
1025	INTEGER(iwp) :: jp !<
1026	INTEGER(iwp) :: kp !<
1027
1028	LOGICAL :: new_pdf = .FALSE. !< check if aerosol PDF has to be recalculated
1029
1030	!
1031	!-- Compute aerosol background distribution
1032	IF ( init_aerosol_probabilistic ) THEN
1033	ALLOCATE( cdf(0:no_bins), r_temp(0:no_bins) )
1034	DO n = 0, no_bins
1035	r_temp(n) = EXP( LOG(rmin) + ( LOG(rmax) - LOG(rmin ) ) / &
1036	REAL(no_bins, KIND=wp) * REAL(n, KIND=wp) )
1037
1038	cdf(n) = 0.0_wp
1039	n_init = n1 + n2 + n3
1040	IF ( n1 > 0.0_wp ) THEN
1041	cdf(n) = cdf(n) + n1 / n_init * ( 0.5_wp + 0.5_wp * &
1042	ERF( LOG( r_temp(n) / rm1 ) / &
1043	( SQRT(2.0_wp) * LOG(s1) ) &
1044	) )
1045	ENDIF
1046	IF ( n2 > 0.0_wp ) THEN
1047	cdf(n) = cdf(n) + n2 / n_init * ( 0.5_wp + 0.5_wp * &
1048	ERF( LOG( r_temp(n) / rm2 ) / &
1049	( SQRT(2.0_wp) * LOG(s2) ) &
1050	) )
1051	ENDIF
1052	IF ( n3 > 0.0_wp ) THEN
1053	cdf(n) = cdf(n) + n3 / n_init * ( 0.5_wp + 0.5_wp * &
1054	ERF( LOG( r_temp(n) / rm3 ) / &
1055	( SQRT(2.0_wp) * LOG(s3) ) &
1056	) )
1057	ENDIF
1058
1059	ENDDO
1060	ENDIF
1061
1062	DO ip = nxl, nxr
1063	DO jp = nys, nyn
1064	DO kp = nzb+1, nzt
1065
1066	number_of_particles = prt_count(kp,jp,ip)
1067	IF ( number_of_particles <= 0 ) CYCLE
1068	particles => grid_particles(kp,jp,ip)%particles(1:number_of_particles)
1069	!
1070	!-- Initialize the aerosols with a predefined spectral distribution
1071	!-- of the dry radius (logarithmically increasing bins) and a varying
1072	!-- weighting factor
1073	IF ( .NOT. init_aerosol_probabilistic ) THEN
1074
1075	new_pdf = .FALSE.
1076	IF ( .NOT. ALLOCATED( r_temp ) ) THEN
1077	new_pdf = .TRUE.
1078	ELSE
1079	IF ( SIZE( r_temp ) .NE. &
1080	number_of_particles - local_start(kp,jp,ip) + 2 ) THEN
1081	new_pdf = .TRUE.
1082	DEALLOCATE( r_temp )
1083	ENDIF
1084	ENDIF
1085
1086	IF ( new_pdf ) THEN
1087
1088	no_bins = number_of_particles + 1 - local_start(kp,jp,ip)
1089	ALLOCATE( r_temp(0:no_bins) )
1090
1091	DO n = 0, no_bins
1092	r_temp(n) = EXP( LOG(rmin) + ( LOG(rmax) - LOG(rmin ) ) / &
1093	REAL(no_bins, KIND=wp) * &
1094	REAL(n, KIND=wp) )
1095	ENDDO
1096
1097	ENDIF
1098
1099	!
1100	!-- Calculate radius and concentration of each aerosol
1101	DO n = local_start(kp,jp,ip), number_of_particles
1102
1103	nn = n - local_start(kp,jp,ip)
1104
1105	r_mid = SQRT( r_temp(nn) * r_temp(nn+1) )
1106	dr = r_temp(nn+1) - r_temp(nn)
1107
1108	pdf = 0.0_wp
1109	n_init = n1 + n2 + n3
1110	IF ( n1 > 0.0_wp ) THEN
1111	pdf = pdf + n1 / n_init * ( 1.0_wp / ( r_mid * LOG(s1) * &
1112	SQRT( 2.0_wp * pi ) &
1113	) * &
1114	EXP( -( LOG( r_mid / rm1 ) )**2 / &
1115	( 2.0_wp * LOG(s1)**2 ) &
1116	) &
1117	)
1118	ENDIF
1119	IF ( n2 > 0.0_wp ) THEN
1120	pdf = pdf + n2 / n_init * ( 1.0_wp / ( r_mid * LOG(s2) * &
1121	SQRT( 2.0_wp * pi ) &
1122	) * &
1123	EXP( -( LOG( r_mid / rm2 ) )**2 / &
1124	( 2.0_wp * LOG(s2)**2 ) &
1125	) &
1126	)
1127	ENDIF
1128	IF ( n3 > 0.0_wp ) THEN
1129	pdf = pdf + n3 / n_init * ( 1.0_wp / ( r_mid * LOG(s3) * &
1130	SQRT( 2.0_wp * pi ) &
1131	) * &
1132	EXP( -( LOG( r_mid / rm3 ) )**2 / &
1133	( 2.0_wp * LOG(s3)**2 ) &
1134	) &
1135	)
1136	ENDIF
1137
1138	particles(n)%rvar2 = r_mid
1139	particles(n)%weight_factor = pdf * dr
1140
1141	END DO
1142	!
1143	!-- Adjust weighting factors to initialize the same number of aerosols
1144	!-- in every grid box
1145	weight_sum = SUM(particles(local_start(kp,jp,ip):number_of_particles)%weight_factor)
1146
1147	particles(local_start(kp,jp,ip):number_of_particles)%weight_factor = &
1148	particles(local_start(kp,jp,ip):number_of_particles)%weight_factor / &
1149	weight_sum * initial_weighting_factor * ( no_bins + 1 )
1150
1151	ENDIF
1152	!
1153	!-- Initialize the aerosols with a predefined weighting factor but
1154	!-- a randomly choosen dry radius
1155	IF ( init_aerosol_probabilistic ) THEN
1156
1157	DO n = local_start(kp,jp,ip), number_of_particles !only new particles
1158
1159	rs_rand = -1.0_wp
1160	DO WHILE ( rs_rand .LT. cdf(0) .OR. rs_rand .GE. cdf(no_bins) )
1161	rs_rand = random_function( iran_part )
1162	ENDDO
1163	!
1164	!-- Determine aerosol dry radius by a random number generator
1165	DO nn = 0, no_bins-1
1166	IF ( cdf(nn) .LE. rs_rand .AND. cdf(nn+1) .GT. rs_rand ) THEN
1167	particles(n)%rvar2 = r_temp(nn) + ( r_temp(nn+1) - r_temp(nn) ) / &
1168	( cdf(nn+1) - cdf(nn) ) * ( rs_rand - cdf(nn) )
1169	EXIT
1170	ENDIF
1171	ENDDO
1172
1173	ENDDO
1174
1175	ENDIF
1176
1177	!
1178	!-- Set particle radius to equilibrium radius based on the environmental
1179	!-- supersaturation (Khvorostyanov and Curry, 2007, JGR). This avoids
1180	!-- the sometimes lengthy growth toward their equilibrium radius within
1181	!-- the simulation.
1182	t_int = pt(kp,jp,ip) * ( hyp(kp) / 100000.0_wp )**0.286_wp
1183
1184	e_s = 611.0_wp * EXP( l_d_rv * ( 3.6609E-3_wp - 1.0_wp / t_int ) )
1185	e_a = q(kp,jp,ip) * hyp(kp) / ( 0.378_wp * q(kp,jp,ip) + 0.622_wp )
1186
1187	sigma = 0.0761_wp - 0.000155_wp * ( t_int - 273.15_wp )
1188	afactor = 2.0_wp * sigma / ( rho_l * r_v * t_int )
1189
1190	bfactor = vanthoff * molecular_weight_of_water * &
1191	rho_s / ( molecular_weight_of_solute * rho_l )
1192	!
1193	!-- The formula is only valid for subsaturated environments. For
1194	!-- supersaturations higher than -5 %, the supersaturation is set to -5%.
1195	IF ( e_a / e_s >= 0.95_wp ) e_a = 0.95_wp * e_s
1196
1197	DO n = local_start(kp,jp,ip), number_of_particles !only new particles
1198	!
1199	!-- For details on this equation, see Eq. (14) of Khvorostyanov and
1200	!-- Curry (2007, JGR)
1201	particles(n)%radius = bfactor*0.3333333_wp &
1202	particles(n)%rvar2 / ( 1.0_wp - e_a / e_s )**0.3333333_wp / &
1203	( 1.0_wp + ( afactor / ( 3.0_wp * bfactor*0.3333333_wp &
1204	particles(n)%rvar2 ) ) / &
1205	( 1.0_wp - e_a / e_s )**0.6666666_wp &
1206	)
1207
1208	ENDDO
1209
1210	ENDDO
1211	ENDDO
1212	ENDDO
1213	!
1214	!-- Deallocate used arrays
1215	IF ( ALLOCATED(r_temp) ) DEALLOCATE( r_temp )
1216	IF ( ALLOCATED(cdf) ) DEALLOCATE( cdf )
1217
1218	END SUBROUTINE lpm_init_aerosols
1219
1220	END MODULE lpm_init_mod

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