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lpj_pftinout.f90 @ 7475

Last change on this file since 7475 was 2442, checked in by sebastiaan.luyssaert, 10 years ago
DEV: replaced most STOPs by ipslerr. This version compiles but has not been tested
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1	! =================================================================================================================================
2	! MODULE : lpj_pftinout
3	!
4	! CONTACT : orchidee-help _at_ ipsl.jussieu.fr
5	!
6	! LICENCE : IPSL (2006)
7	! This software is governed by the CeCILL licence see ORCHIDEE/ORCHIDEE_CeCILL.LIC
8	!
9	!>\BRIEF Introduce and eliminate PFT's from pixel
10	!!
11	!! \n DESCRIPTION: None
12	!!
13	!! RECENT CHANGE(S) : None
14	!!
15	!! REFERENCE(S) :
16	!! - Sitch, S., B. Smith, et al. (2003), Evaluation of ecosystem dynamics,
17	!! plant geography and terrestrial carbon cycling in the LPJ dynamic
18	!! global vegetation model, Global Change Biology, 9, 161-185.\n
19	!! - Thonicke, K., S. Venevsky, et al. (2001), The role of fire disturbance
20	!! for global vegetation dynamics: coupling fire into a Dynamic Global
21	!! Vegetation Model, Global Ecology and Biogeography, 10, 661-677.\n
22	!! - Haxeltine, A. and I. C. Prentice (1996), BIOME3: An equilibrium
23	!! terrestrial biosphere model based on ecophysiological constraints,
24	!! resource availability, and competition among plant functional types,
25	!! Global Biogeochemical Cycles, 10(4), 693-709.\n
26	!! - Smith, B., I. C. Prentice, et al. (2001), Representation of vegetation
27	!! dynamics in the modelling of terrestrial ecosystems: comparing two
28	!! contrasting approaches within European climate space,
29	!! Global Ecology and Biogeography, 10, 621-637.\n
30	!!
31	!! SVN :
32	!! $HeadURL$
33	!! $Date$
34	!! $Revision$
35	!! \n
36	!_ ==============================================================================================================================
37
38	MODULE lpj_pftinout
39
40	! modules used:
41
42	USE ioipsl_para
43	USE stomate_data
44	USE pft_parameters
45	USE constantes
46
47	IMPLICIT NONE
48
49	! private & public routines
50
51	PRIVATE
52	PUBLIC pftinout,pftinout_clear
53
54	LOGICAL, SAVE :: firstcall = .TRUE. !! first call
55	!$OMP THREADPRIVATE(firstcall)
56
57	CONTAINS
58
59
60	!! ================================================================================================================================
61	!! SUBROUTINE : pftinout_clear
62	!!
63	!>\BRIEF Set flag ::firstcall to true and initialize the variables
64	!_ ================================================================================================================================
65
66	SUBROUTINE pftinout_clear
67	firstcall = .TRUE.
68	END SUBROUTINE pftinout_clear
69
70	!! ================================================================================================================================
71	!! SUBROUTINE : pftinout
72	!!
73	!>\BRIEF Introduce and eliminate PFT's from pixel
74	!!
75	!! DESCRIPTION**3 : Introduction and elimination of PFTs on the basis of climate condition.
76	!! For natural and woody PFTs the foliage projected coverage is calculated as follows:
77	!! \latexonly
78	!! \input{equation_lpj_pftinout.tex}
79	!! \endlatexonly
80	!! \n
81	!! where FPC is foliage projective cover (::fpc_nat), CN crown area (::cn_ind,
82	!! @tex $ m^{2} $ @endtex), IND number of individuals (::ind, @tex $ m^{-2} $ @endtex,
83	!! FRAC total fraction occupied by natural vegetation (::fracnat),
84	!! @tex $ LM_{rm max} $ @endtex maximum leaf mass in last year
85	!! (::lm_lastyearmax, @tex $ g C m^{-2} $ @endtex), SLA specific leaf area (sla,
86	!! @tex $ m^{2} (g C)^{-1} $ @endtex), and coff coefficient (::ext_coeff). ::ext_coeff
87	!! describes a property of the canopy (i.e. law of Lambert-Beer) and is defined in **2
88	!!
89	!! The foliage projective cover feeds into the calculation of the space available for
90	!! expansion of existing and dispersion of new PFTs within a gridbox. In turn, available
91	!! space is use to calculate the number of individuals with a PFT.
92	!!
93	!! Saplings are introduced under the condition that winter temperature is
94	!! moderate, plant age is older than 1.25, (and for some PFTs at least one adjacent grid
95	!! box exists for expansion), new saplings are introduced for narural PFT. In the simulation of
96	!! agricultural grassland, if target PFT does not exist in the gridbox, it is introduced
97	!! regardless of climate condition. When a new PFT is introduced CO_2 is taken from the
98	!! atmosphere to account for CO_2 present in the seed and required by the germinated seeds
99	!! to establish a sapling. These initial phases in ontology are not accounted for. However,
100	!! by taking this small amount of CO2 from the atmosphere, mass balance closure for C is
101	!! preserved.
102	!!
103	!! PFTs are eliminated under the condition that they are no longer adapted to the critical
104	!! temperatures in winter. When a PFT is eliminated its number of indiviuals is set to zero and
105	!! the rest of the elimination process is taken care of in lpj_kill.f90.
106	!!
107	!! RECENT CHANGE(S) : None
108	!!
109	!! MAIN OUTPUT VARIABLE(S): :: avail_tree (space availability for trees, unitless),
110	!! :: avail_grass (space availability for grasses, unitless), :: biomass (biomass, \f$gC m^{-2}\f$)
111	!! and :: ind (density of individuals, \f$m^{-2}\f$)
112	!!
113	!! REFERENCE(S) : None
114	!!
115	!! FLOWCHART :
116	!! \latexonly
117	!! \includegraphics[scale = 0.6]{pftinout.png}
118	!! \endlatexonly
119	!! \n
120	!_ ================================================================================================================================
121
122
123
124
125
126
127	SUBROUTINE pftinout (npts, dt, adapted, regenerate, &
128	neighbours, veget_max, &
129	biomass, ind, cn_ind, age, leaf_frac, npp_longterm, lm_lastyearmax, senescence, &
130	PFTpresent, everywhere, when_growthinit, need_adjacent, RIP_time, &
131	co2_to_bm, &
132	avail_tree, avail_grass)
133
134	!! 0. Variable and parameter declaration
135
136	!! 0.1 Input variables
137
138	INTEGER(i_std), INTENT(in) :: npts !! Domain size - number of pixels (unitless)
139	REAL(r_std), INTENT(in) :: dt !! Time step of vegetation dynamics for stomate
140	!! (days)
141	REAL(r_std), DIMENSION(npts,nvm), INTENT(in) :: adapted !! Winter not too cold (unitless)
142	REAL(r_std), DIMENSION(npts,nvm), INTENT(in) :: regenerate !! Winter sufficiently cold (unitless)
143	INTEGER(i_std), DIMENSION(npts,8), INTENT(in) :: neighbours !! Indices of the 8 neighbours of each grid point
144	!! (unitless); 1=N, 2=NE, 3=E, 4=SE, 5=S, 6=SW,
145	!! 7=W, 8=NW
146	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: veget_max !! "maximal" coverage fraction of a PFT (LAI ->
147	!! infinity) on ground (unitless)
148
149	!! 0.2 Output variables
150
151	REAL(r_std), DIMENSION(npts), INTENT(out) :: avail_tree !! Space availability for trees (unitless)
152	REAL(r_std), DIMENSION(npts), INTENT(out) :: avail_grass !! Space availability for grasses (unitless)
153
154
155	!! 0.3 Modified variables
156
157	REAL(r_std), DIMENSION(npts,nvm,nparts,nelements), INTENT(inout) :: biomass !! Biomass (gC m^{-2})
158	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: ind !! Density of individuals (m^{-2})
159	REAL(r_std), DIMENSION(npts,nvm), INTENT(in) :: cn_ind !! Crown area of individuals (m^2)
160	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: age !! Mean age (years)
161	REAL(r_std), DIMENSION(npts,nvm,nleafages), INTENT(inout) :: leaf_frac !! Fraction of leaves in leaf age class (unitless)
162	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: npp_longterm !! "long term" net primary productivity
163	!! (gC m^{-2} year^{-1})
164	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: lm_lastyearmax !! Last year's maximum leaf mass, for each PFT
165	!! (gC m^{-2})
166	LOGICAL, DIMENSION(npts,nvm), INTENT(inout) :: senescence !! Plant senescent for deciduous trees; .FALSE.
167	!! if PFT is introduced or killed
168	LOGICAL, DIMENSION(npts,nvm), INTENT(inout) :: PFTpresent !! PFT exists
169	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: everywhere !! is the PFT everywhere in the grid box or very
170	!! localized (unitless)
171	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: when_growthinit !! how many days ago was the beginning of the
172	!! growing season (days)
173	LOGICAL, DIMENSION(npts,nvm), INTENT(inout) :: need_adjacent !! in order for this PFT to be introduced, does it
174	!! have to be present in an adjacent grid box?
175	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: RIP_time !! How much time ago was the PFT eliminated for
176	!! the last time (years)
177	REAL(r_std), DIMENSION(npts,nvm), INTENT(inout) :: co2_to_bm !! biomass uptaken (gC m^{-2} day^{-1})
178
179	!! 0.4 Local variables
180
181	REAL(r_std), DIMENSION(npts) :: avail !! availability
182	INTEGER(i_std) :: i,j,m !! indices
183	REAL(r_std), DIMENSION(npts) :: sumfrac_wood !! total woody vegetation cover
184	INTEGER(i_std), DIMENSION(npts) :: n_present !! number of adjacent grid cells where PFT is
185	!! ubiquitous
186	LOGICAL, DIMENSION(npts) :: can_introduce !! we can introduce this PFT
187	REAL(r_std), DIMENSION(npts) :: fracnat !! no real need for dimension(ntps) except for
188	!! vectorisation
189	!_ ================================================================================================================================
190
191	IF (bavard.GE.3) WRITE(numout,*) 'Entering pftinout'
192
193	!! 1. Messages
194
195	IF ( firstcall ) THEN
196
197	WRITE(numout,*) 'pftinout: Minimum space availability: ', min_avail
198
199	firstcall = .FALSE.
200
201	ENDIF
202
203	!! 2. Total woody fpc and space avaibility on grid
204
205	! Only natural part of the grid cell\n
206	! SZ bug correction MERGE: need to subtract agricultural area!
207	! fraction of agricultural surface
208
209	!! 2.1 only natural PFT
210	fracnat(:) = un
211	DO j = 2,nvm ! Loop over # PFTs
212	IF ( .NOT. natural(j) ) THEN
213	fracnat(:) = fracnat(:) - veget_max(:,j)
214	ENDIF
215	ENDDO ! Loop over # PFTs
216
217	!! 2.2 Total woody fractional plant cover
218	sumfrac_wood(:) = zero
219	DO j = 2,nvm ! Loop over # PFTs
220
221	! SZ problem here: agriculture, not convinced that this representation of LPJ is correct
222	! if agriculture is present, ind must be recalculated to correspond to the natural density...
223	! since ind is per grid cell, can be achived by discounting for agricultura fraction
224	IF ( natural(j).AND.is_tree(j) ) THEN
225	WHERE(fracnat(:).GT.min_stomate)
226	sumfrac_wood(:) = sumfrac_wood(:) + cn_ind(:,j) * ind(:,j) / fracnat(:) &
227	* ( un - exp( - lm_lastyearmax(:,j) * sla(j) * ext_coeff(j) ) )
228	!lai changed to lm_last
229	ENDWHERE
230	ENDIF
231	ENDDO ! Loop over # PFTs
232
233	!! 2.3 Space availability
234	avail_grass(:) = MAX( ( un - sumfrac_wood(:) ), min_avail )
235	avail_tree(:) = MAX( ( fpc_crit - sumfrac_wood(:) ), min_avail )
236
237	!! 3. Time since last elimination (y)
238
239	RIP_time = RIP_time + dt / one_year
240
241	!! 4. Agicultural PFTs
242
243	! Agricultural PFTs are only present if they are prescribed
244	DO j = 2,nvm ! Loop over # PFTs
245
246	IF ( .NOT. natural(j) ) THEN
247
248	IF (bavard.GE.4) WRITE(numout,*) 'pftinout: Agricultural PFTs'
249
250	!! 4.1 Agricultural trees
251	! Agricultural trees are not treated for the moment
252	IF ( is_tree(j) ) THEN
253
254	CALL ipslerr_p (3,'lpj_pftinout',&
255	'pftinout: Agricultural trees not treated.','','')
256
257	!! 4.2 Initialization of agricultural grass lands
258	! Initialize parameter values of prescribed agricultural PFTs
259	ELSE
260
261	DO i = 1, npts ! Loop over # pixels - domain size
262
263	IF ( ( veget_max(i,j) .GT. min_stomate ) .AND. ( .NOT. PFTpresent(i,j) ) ) THEN
264
265	! prescribed, but not yet there.
266	ind(i,j) = veget_max(i,j)
267	biomass(i,j,:,:) = bm_sapl_old(j,:,:) * ind(i,j) /veget_max(i,j)
268	co2_to_bm(i,j) = co2_to_bm(i,j) +SUM( biomass(i,j,:,icarbon) ) / dt
269	PFTpresent(i,j) = .TRUE.
270	everywhere(i,j) = un
271	senescence(i,j) = .FALSE.
272	age(i,j) = zero
273
274	ENDIF ! prescribed, but PFT not yet present
275
276	ENDDO ! Loop over # pixels - domain size
277
278	ENDIF
279
280	ENDIF ! not natural
281
282	ENDDO ! Loop over # PFTs
283
284	!! 5 Eliminate PFTs
285
286	DO j = 2,nvm ! Loop over # PFTs
287
288	! only for natural PFTs
289	IF ( natural(j) ) THEN
290
291	! Number of individuals are set to zero in the condition of cold winter
292	! 'adapted_crit' critical value for being adapted = 1.-(1./euler); see 'stomate_constants.f90'
293	WHERE ( PFTpresent(:,j) .AND. ( adapted(:,j) .LT. adapted_crit ) )
294
295	! PFT there, but not adapted any more (ex: winter too cold): kill
296	! set number of individuals to zero - rest will be done in lpj_kill
297	ind(:,j) = zero
298
299	ENDWHERE
300	WRITE(6,*) 'jfieozje lpj_pftinout',ind
301
302	ENDIF ! natural
303
304	ENDDO ! Loop over # PFTs
305
306	!! 6. Introduce PFTs
307
308	DO j = 2,nvm ! Loop over # PFTs
309
310	IF ( natural(j) ) THEN
311
312	! space availability for this PFT
313	IF ( is_tree(j) ) THEN
314	avail(:) = avail_tree(:)
315	ELSE
316	avail(:) = avail_grass(:)
317	ENDIF
318
319	!! 6.1 Check if PFT not present but (adapted and regenerative)
320	can_introduce(:) = .FALSE.
321
322	DO i = 1, npts ! Loop over # pixels - domain size
323
324	IF ( .NOT. PFTpresent(i,j) .AND. &
325	( adapted(i,j) .GT. adapted_crit ) .AND. &
326	( regenerate(i,j) .GT. regenerate_crit ) ) THEN
327
328	! Seed are available nearby
329	IF ( need_adjacent(i,j) ) THEN
330
331	!! 6.1.1 Climate allows introduction of the PFT but dispersion requires the
332	! presence of seeds. Seed are considered available if at least one
333	! neighbouring pixel is entirely invaded by the PFT. If that condition is
334	! satisfied, the PFT can establish in the new pixel.
335	! Count number of totally invaded neighbours.
336	! no loop so that it can vectorize
337	n_present(i) = 0
338	IF ( neighbours(i,1) .GT. 0 ) THEN
339	IF ( everywhere(neighbours(i,1),j) .GE. un-min_stomate ) THEN
340	n_present(i) = n_present(i)+1
341	ENDIF
342	ENDIF
343	IF ( neighbours(i,3) .GT. 0 ) THEN
344	IF ( everywhere(neighbours(i,3),j) .GE. un-min_stomate ) THEN
345	n_present(i) = n_present(i)+1
346	ENDIF
347	ENDIF
348	IF ( neighbours(i,5) .GT. 0 ) THEN
349	IF ( everywhere(neighbours(i,5),j) .GE. un-min_stomate ) THEN
350	n_present(i) = n_present(i)+1
351	ENDIF
352	ENDIF
353	IF ( neighbours(i,7) .GT. 0 ) THEN
354	IF ( everywhere(neighbours(i,7),j) .GE. un-min_stomate ) THEN
355	n_present(i) = n_present(i)+1
356	ENDIF
357	ENDIF
358
359	IF ( n_present(i) .GT. 0 ) THEN
360
361	! PFT is ubiquitous in at least one adjacent grid box
362	can_introduce(i) = .TRUE.
363
364	ENDIF
365
366	ELSE
367
368	!! 6.1.2 No seed (trees) required for dispersion
369	! The PFT can establish without the presence of seed trees in
370	! neighbouring pixels.
371	can_introduce(i) = .TRUE.
372
373	ENDIF ! do we have to look at the neighbours?
374
375	ENDIF ! we'd like to introduce the PFT
376
377	ENDDO ! Loop over # pixels - domain size
378
379	!! 6.2 Has the PFT been eliminated lately?
380	! Additional test whether the PFT has been eliminated lately, i.e.
381	! less than 1.25 years ago. Do not only take full years as success of
382	! introduction, as introduction might depend on season.
383	WHERE ( RIP_time(:,j) .LT. RIP_time_min )
384
385	! PFT was eliminated lately - cannot reintroduce
386	can_introduce(:) = .FALSE.
387
388	ENDWHERE
389
390	!! 6.3 Introduce that PFT where possible
391	! "can_introduce" means that it either exists in neighbouring grid boxes
392	! or that we do not look at neighbours, that it has not been eliminated
393	! lately, and, of course, that the climate is good for that PFT.
394	WHERE ( can_introduce(:) )
395
396	PFTpresent(:,j) = .TRUE.
397
398	senescence(:,j) = .FALSE.
399
400	! introduce at least a few saplings, even if canopy is closed
401	! initial density of individuals (ind_0) = 0.02, see 'stomate_constant.f90'
402	ind(:,j) = ind_0 * (dt/one_year) * avail(:)
403
404	WHERE(veget_max(:,j) .GT. min_stomate)
405	biomass(:,j,ileaf,icarbon) = bm_sapl_old(j,ileaf,icarbon) * ind(:,j) /veget_max(:,j)
406	biomass(:,j,isapabove,icarbon) = bm_sapl_old(j,isapabove,icarbon) * ind(:,j) /veget_max(:,j)
407	biomass(:,j,isapbelow,icarbon) = bm_sapl_old(j,isapbelow,icarbon) * ind(:,j)/veget_max(:,j)
408	biomass(:,j,iheartabove,icarbon) = bm_sapl_old(j,iheartabove,icarbon) * ind(:,j)/veget_max(:,j)
409	biomass(:,j,iheartbelow,icarbon) = bm_sapl_old(j,iheartbelow,icarbon) * ind(:,j)/veget_max(:,j)
410	biomass(:,j,iroot,icarbon) = bm_sapl_old(j,iroot,icarbon) * ind(:,j)/veget_max(:,j)
411	biomass(:,j,ifruit,icarbon) = bm_sapl_old(j,ifruit,icarbon) * ind(:,j)/veget_max(:,j)
412	biomass(:,j,icarbres,icarbon) = bm_sapl_old(j,icarbres,icarbon) * ind(:,j)/veget_max(:,j)
413	ELSEWHERE
414	biomass(:,j,ileaf,icarbon) = bm_sapl_old(j,ileaf,icarbon) * ind(:,j)
415	biomass(:,j,isapabove,icarbon) = bm_sapl_old(j,isapabove,icarbon) * ind(:,j)
416	biomass(:,j,isapbelow,icarbon) = bm_sapl_old(j,isapbelow,icarbon) * ind(:,j)
417	biomass(:,j,iheartabove,icarbon) = bm_sapl_old(j,iheartabove,icarbon) * ind(:,j)
418	biomass(:,j,iheartbelow,icarbon) = bm_sapl_old(j,iheartbelow,icarbon) * ind(:,j)
419	biomass(:,j,iroot,icarbon) = bm_sapl_old(j,iroot,icarbon) * ind(:,j)
420	biomass(:,j,ifruit,icarbon) = bm_sapl_old(j,ifruit,icarbon) * ind(:,j)
421	biomass(:,j,icarbres,icarbon) = bm_sapl_old(j,icarbres,icarbon) * ind(:,j)
422	END WHERE
423
424	co2_to_bm(:,j) = &
425	co2_to_bm(:,j) / dt * &
426	( biomass(:,j,ileaf,icarbon) + biomass(:,j,isapabove,icarbon) + &
427	biomass(:,j,isapbelow,icarbon) + biomass(:,j,iheartabove,icarbon) + &
428	biomass(:,j,iheartbelow,icarbon) + biomass(:,j,iroot,icarbon) + &
429	biomass(:,j,ifruit,icarbon) + biomass(:,j,icarbres,icarbon) )
430
431	when_growthinit(:,j) = large_value
432
433	age(:,j) = zero
434
435	! all leaves are young
436	leaf_frac(:,j,1) = un
437
438	! non-zero "long term" npp and last year's leaf mass for saplings -
439	! so they won't be killed off by gap or kill
440	npp_longterm(:,j) = npp_longterm_init
441
442	lm_lastyearmax(:,j) = bm_sapl_old(j,ileaf,icarbon) * ind(:,j)
443
444	ENDWHERE ! we can introduce the PFT
445
446	!! 6.4 Expansion of the PFT within the grid box
447	! PFT expansion/dispersion to a new grid box should not be confused with
448	! expansion in areal coverage
449	IF ( treat_expansion ) THEN
450
451	WHERE ( can_introduce(:) )
452
453	! low value at the beginning
454	everywhere(:,j) = everywhere_init
455	ENDWHERE
456
457	ELSE
458
459	! expansion is not treated
460	WHERE ( can_introduce(:) )
461	everywhere(:,j) = un
462	ENDWHERE
463
464	ENDIF ! treat expansion
465
466	ENDIF ! only natural PFTs
467
468	ENDDO ! Loop over # PFTs
469
470	!! 7. If a PFT has been present once in a grid box, we suppose that it will survive
471
472	! If a PFT has been present once in a grid box, we suppose that it will survive
473	! in isolated places (e.g., an oasis) within that grid box, even if it gets
474	! officially eliminated from it later. That means that if climate becomes favorable
475	! again, it will not need to get seeds from adjacent grid cells.
476	WHERE ( PFTpresent )
477	need_adjacent = .FALSE.
478	ENDWHERE
479
480	IF (bavard.GE.4) WRITE(numout,*) 'Leaving pftinout'
481
482	END SUBROUTINE pftinout
483
484	END MODULE lpj_pftinout

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