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p4zmeso.F90 in NEMO/branches/2019/dev_r11708_aumont_PISCES_QUOTA/src/TOP/PISCES/P4Z – NEMO

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source: NEMO/branches/2019/dev_r11708_aumont_PISCES_QUOTA/src/TOP/PISCES/P4Z/p4zmeso.F90 @ 12538

Last change on this file since 12538 was 12538, checked in by aumont, 4 years ago
initialization of local arrays to 0
Property svn:keywords set to `Id`
File size: 32.0 KB

Rev	Line
[3443]	1	MODULE p4zmeso
	2	!!======================================================================
	3	!! * MODULE p4zmeso *
	4	!! TOP : PISCES Compute the sources/sinks for mesozooplankton
	5	!!======================================================================
	6	!! History : 1.0 ! 2002 (O. Aumont) Original code
	7	!! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90
	8	!! 3.4 ! 2011-06 (O. Aumont, C. Ethe) Quota model for iron
	9	!!----------------------------------------------------------------------
[12537]	10	!! p4z_meso : Compute the sources/sinks for mesozooplankton
	11	!! p4z_meso_init : Initialization of the parameters for mesozooplankton
	12	!! p4z_meso_alloc : Allocate variables for mesozooplankton
[3443]	13	!!----------------------------------------------------------------------
[9169]	14	USE oce_trc ! shared variables between ocean and passive tracers
	15	USE trc ! passive tracers common variables
	16	USE sms_pisces ! PISCES Source Minus Sink variables
	17	USE p4zprod ! production
	18	USE prtctl_trc ! print control for debugging
	19	USE iom ! I/O manager
[3443]	20
	21	IMPLICIT NONE
	22	PRIVATE
	23
	24	PUBLIC p4z_meso ! called in p4zbio.F90
	25	PUBLIC p4z_meso_init ! called in trcsms_pisces.F90
[12537]	26	PUBLIC p4z_meso_alloc ! called in trcini_pisces.F90
[3443]	27
[12537]	28	!! * Shared module variables
[4147]	29	REAL(wp), PUBLIC :: part2 !: part of calcite not dissolved in mesozoo guts
[10362]	30	REAL(wp), PUBLIC :: xpref2d !: mesozoo preference for diatoms
	31	REAL(wp), PUBLIC :: xpref2n !: mesozoo preference for nanophyto
	32	REAL(wp), PUBLIC :: xpref2z !: mesozoo preference for microzooplankton
	33	REAL(wp), PUBLIC :: xpref2c !: mesozoo preference for POC
[4147]	34	REAL(wp), PUBLIC :: xthresh2zoo !: zoo feeding threshold for mesozooplankton
	35	REAL(wp), PUBLIC :: xthresh2dia !: diatoms feeding threshold for mesozooplankton
	36	REAL(wp), PUBLIC :: xthresh2phy !: nanophyto feeding threshold for mesozooplankton
	37	REAL(wp), PUBLIC :: xthresh2poc !: poc feeding threshold for mesozooplankton
	38	REAL(wp), PUBLIC :: xthresh2 !: feeding threshold for mesozooplankton
	39	REAL(wp), PUBLIC :: resrat2 !: exsudation rate of mesozooplankton
	40	REAL(wp), PUBLIC :: mzrat2 !: microzooplankton mortality rate
	41	REAL(wp), PUBLIC :: grazrat2 !: maximal mesozoo grazing rate
	42	REAL(wp), PUBLIC :: xkgraz2 !: non assimilated fraction of P by mesozoo
	43	REAL(wp), PUBLIC :: unass2 !: Efficicency of mesozoo growth
	44	REAL(wp), PUBLIC :: sigma2 !: Fraction of mesozoo excretion as DOM
[10362]	45	REAL(wp), PUBLIC :: epsher2 !: growth efficiency
	46	REAL(wp), PUBLIC :: epsher2min !: minimum growth efficiency at high food for grazing 2
[4147]	47	REAL(wp), PUBLIC :: grazflux !: mesozoo flux feeding rate
[12524]	48	REAL(wp), PUBLIC :: xfracmig !: Fractional biomass of meso that performs DVM
	49	LOGICAL , PUBLIC :: ln_dvm_meso !: Boolean to activate DVM of mesozooplankton
[12537]	50	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: depmig !: DVM of mesozooplankton : migration depth
	51	INTEGER , ALLOCATABLE, SAVE, DIMENSION(:,:) :: kmig !: Vertical indice of the the migration depth
[3443]	52
	53	!!----------------------------------------------------------------------
[10067]	54	!! NEMO/TOP 4.0 , NEMO Consortium (2018)
[10069]	55	!! $Id$
[10068]	56	!! Software governed by the CeCILL license (see ./LICENSE)
[3443]	57	!!----------------------------------------------------------------------
	58	CONTAINS
	59
[5385]	60	SUBROUTINE p4z_meso( kt, knt )
[3443]	61	!!---------------------------------------------------------------------
	62	!! * ROUTINE p4z_meso *
	63	!!
	64	!! ** Purpose : Compute the sources/sinks for mesozooplankton
[12537]	65	!! This includes ingestion and assimilation, flux feeding
	66	!! and mortality. We use a passive prey switching
	67	!! parameterization.
	68	!! All living compartments smaller than mesozooplankton
	69	!! are potential preys of mesozooplankton as well as small
	70	!! sinking particles
[3443]	71	!!
	72	!! ** Method : - ???
	73	!!---------------------------------------------------------------------
[9169]	74	INTEGER, INTENT(in) :: kt, knt ! ocean time step and ???
	75	!
[12524]	76	INTEGER :: ji, jj, jk, jkt
[3443]	77	REAL(wp) :: zcompadi, zcompaph, zcompapoc, zcompaz, zcompam
[12537]	78	REAL(wp) :: zgraze2 , zdenom, zdenom2, zfact , zfood, zfoodlim, zproport, zbeta
[7646]	79	REAL(wp) :: zmortzgoc, zfrac, zfracfe, zratio, zratio2, zfracal, zgrazcal
[12349]	80	REAL(wp) :: zepsherf, zepshert, zepsherq, zepsherv, zgrarsig, zgraztotc, zgraztotn, zgraztotf
[12524]	81	REAL(wp) :: zmigreltime, zprcaca, zmortz, zgrasrat, zgrasratn
[12537]	82	REAL(wp) :: zrespz, ztortz, zgrazd, zgrazz, zgrazpof, zgrazn, zgrazpoc, zgraznf, zgrazf
	83	REAL(wp) :: zgrazfffp, zgrazfffg, zgrazffep, zgrazffeg, zrum, zcodel, zargu, zval
[4148]	84	CHARACTER (len=25) :: charout
[10362]	85	REAL(wp), DIMENSION(jpi,jpj,jpk) :: zgrazing, zfezoo2
[12524]	86	REAL(wp), DIMENSION(jpi,jpj,jpk) :: zgrarem, zgraref, zgrapoc, zgrapof
	87	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zgramigrem, zgramigref, zgramigpoc, zgramigpof, zstrn
[10362]	88	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: zw3d, zz2ligprod
[3443]	89	!!---------------------------------------------------------------------
	90	!
[9124]	91	IF( ln_timing ) CALL timing_start('p4z_meso')
[3443]	92	!
[12538]	93	zgrazing(:,:,:) = 0._wp ; zgrapoc(:,:,:) = 0._wp
	94	zfezoo2 (:,:,:) = 0._wp ; zgrarem(:,:,:) = 0._wp
	95	zgraref (:,:,:) = 0._wp ; zgrapof(:,:,:) = 0._wp
[10362]	96	!
	97	IF (ln_ligand) THEN
	98	ALLOCATE( zz2ligprod(jpi,jpj,jpk) )
	99	zz2ligprod(:,:,:) = 0._wp
	100	ENDIF
	101	!
[12524]	102	! Diurnal vertical migration of mesozooplankton
[12537]	103	! Computation of the migration depth
[12524]	104	! ---------------------------------------------
	105	IF (ln_dvm_meso) CALL p4z_meso_depmig
	106	!
[12538]	107	DO jk = 1, jpk
[3443]	108	DO jj = 1, jpj
	109	DO ji = 1, jpi
[5385]	110	zcompam = MAX( ( trb(ji,jj,jk,jpmes) - 1.e-9 ), 0.e0 )
[7646]	111	zfact = xstep * tgfunc2(ji,jj,jk) * zcompam
[3443]	112
[12537]	113	! linear mortality of mesozooplankton
	114	! A michaelis menten modulation term is used to avoid extinction of
	115	! mesozooplankton at very low food concentration. Mortality is
	116
	117	! enhanced in low O2 waters
	118	! -----------------------------------------------------------------
[10362]	119	zrespz = resrat2 * zfact * ( trb(ji,jj,jk,jpmes) / ( xkmort + trb(ji,jj,jk,jpmes) ) &
	120	& + 3. * nitrfac(ji,jj,jk) )
[3443]	121
[12537]	122	! Zooplankton quadratic mortality. A square function has been selected with
	123	! to mimic predation and disease (density dependent mortality). It also tends
	124	! to stabilise the model
	125	! -------------------------------------------------------------------------
[10362]	126	ztortz = mzrat2 * 1.e6 * zfact * trb(ji,jj,jk,jpmes) * (1. - nitrfac(ji,jj,jk) )
[12537]	127
	128	! Computation of the abundance of the preys
	129	! A threshold can be specified in the namelist
	130	! --------------------------------------------
[5385]	131	zcompadi = MAX( ( trb(ji,jj,jk,jpdia) - xthresh2dia ), 0.e0 )
	132	zcompaz = MAX( ( trb(ji,jj,jk,jpzoo) - xthresh2zoo ), 0.e0 )
[10362]	133	zcompapoc = MAX( ( trb(ji,jj,jk,jppoc) - xthresh2poc ), 0.e0 )
[4529]	134	! Size effect of nanophytoplankton on grazing : the smaller it is, the less prone
[12537]	135	! it is to predation by mesozooplankton. We use a quota dependant parameterization
	136	! as a low quota indicates oligotrophic conditions which are charatcerized by
	137	! small cells
[4529]	138	! -------------------------------------------------------------------------------
[5385]	139	zcompaph = MAX( ( trb(ji,jj,jk,jpphy) - xthresh2phy ), 0.e0 ) &
[4529]	140	& * MIN(1., MAX( 0., ( quotan(ji,jj,jk) - 0.2) / 0.3 ) )
[3443]	141
[12524]	142	! Mesozooplankton grazing
[12537]	143	! The total amount of food is the sum of all preys accessible to mesozooplankton
	144	! multiplied by their food preference
	145	! A threshold can be specified in the namelist (xthresh2). However, when food
	146	! concentration is close to this threshold, it is decreased to avoid the
	147	! accumulation of food in the mesozoopelagic domain
	148	! -------------------------------------------------------------------------------
[10362]	149	zfood = xpref2d * zcompadi + xpref2z * zcompaz + xpref2n * zcompaph + xpref2c * zcompapoc
[4148]	150	zfoodlim = MAX( 0., zfood - MIN( 0.5 * zfood, xthresh2 ) )
[3443]	151	zdenom = zfoodlim / ( xkgraz2 + zfoodlim )
	152	zdenom2 = zdenom / ( zfood + rtrn )
[10222]	153	zgraze2 = grazrat2 * xstep * tgfunc2(ji,jj,jk) * trb(ji,jj,jk,jpmes) * (1. - nitrfac(ji,jj,jk))
[3443]	154
[12537]	155	! The grazing pressure on each prey is computed assuming passive switching. This
	156	! is equivalent to assuming that mesozooplankton have an opportunistic feeding
	157	! behaviour.
	158	! -----------------------------------------------------------------------------
[10362]	159	zgrazd = zgraze2 * xpref2d * zcompadi * zdenom2
	160	zgrazz = zgraze2 * xpref2z * zcompaz * zdenom2
	161	zgrazn = zgraze2 * xpref2n * zcompaph * zdenom2
	162	zgrazpoc = zgraze2 * xpref2c * zcompapoc * zdenom2
[3443]	163
[5385]	164	zgraznf = zgrazn * trb(ji,jj,jk,jpnfe) / ( trb(ji,jj,jk,jpphy) + rtrn)
	165	zgrazf = zgrazd * trb(ji,jj,jk,jpdfe) / ( trb(ji,jj,jk,jpdia) + rtrn)
	166	zgrazpof = zgrazpoc * trb(ji,jj,jk,jpsfe) / ( trb(ji,jj,jk,jppoc) + rtrn)
[3443]	167
[12537]	168	! Mesozooplankton flux feeding on GOC and POC. The feeding pressure
	169	! is proportional to the flux
	170	! ------------------------------------------------------------------
[7646]	171	zgrazffeg = grazflux * xstep * wsbio4(ji,jj,jk) &
[8533]	172	& * tgfunc2(ji,jj,jk) * trb(ji,jj,jk,jpgoc) * trb(ji,jj,jk,jpmes) &
	173	& * (1. - nitrfac(ji,jj,jk))
[5385]	174	zgrazfffg = zgrazffeg * trb(ji,jj,jk,jpbfe) / (trb(ji,jj,jk,jpgoc) + rtrn)
[7646]	175	zgrazffep = grazflux * xstep * wsbio3(ji,jj,jk) &
[8533]	176	& * tgfunc2(ji,jj,jk) * trb(ji,jj,jk,jppoc) * trb(ji,jj,jk,jpmes) &
	177	& * (1. - nitrfac(ji,jj,jk))
[5385]	178	zgrazfffp = zgrazffep * trb(ji,jj,jk,jpsfe) / (trb(ji,jj,jk,jppoc) + rtrn)
[12537]	179
[10362]	180	zgraztotc = zgrazd + zgrazz + zgrazn + zgrazpoc + zgrazffep + zgrazffeg
[12537]	181	! Compute the proportion of filter feeders. It is assumed steady state.
	182	! ---------------------------------------------------------------------
[10362]	183	zproport = (zgrazffep + zgrazffeg)/(rtrn + zgraztotc)
[12537]	184
[10362]	185	! Compute fractionation of aggregates. It is assumed that
	186	! diatoms based aggregates are more prone to fractionation
	187	! since they are more porous (marine snow instead of fecal pellets)
[12537]	188	! -----------------------------------------------------------------
[10362]	189	zratio = trb(ji,jj,jk,jpgsi) / ( trb(ji,jj,jk,jpgoc) + rtrn )
	190	zratio2 = zratio * zratio
	191	zfrac = zproport * grazflux * xstep * wsbio4(ji,jj,jk) &
[5385]	192	& * trb(ji,jj,jk,jpgoc) * trb(ji,jj,jk,jpmes) &
[4800]	193	& * ( 0.2 + 3.8 * zratio2 / ( 1.**2 + zratio2 ) )
[10362]	194	zfracfe = zfrac * trb(ji,jj,jk,jpbfe) / (trb(ji,jj,jk,jpgoc) + rtrn)
[4148]	195
[12537]	196	! Flux feeding is multiplied by the fractional biomass of flux feeders
[10362]	197	zgrazffep = zproport * zgrazffep
	198	zgrazffeg = zproport * zgrazffeg
	199	zgrazfffp = zproport * zgrazfffp
	200	zgrazfffg = zproport * zgrazfffg
	201	zgraztotc = zgrazd + zgrazz + zgrazn + zgrazpoc + zgrazffep + zgrazffeg
	202	zgraztotn = zgrazd * quotad(ji,jj,jk) + zgrazz + zgrazn * quotan(ji,jj,jk) &
	203	& + zgrazpoc + zgrazffep + zgrazffeg
	204	zgraztotf = zgrazf + zgraznf + zgrazz * ferat3 + zgrazpof + zgrazfffp + zgrazfffg
[4148]	205
[10362]	206	! Total grazing ( grazing by microzoo is already computed in p4zmicro )
	207	zgrazing(ji,jj,jk) = zgraztotc
[3446]	208
[12537]	209	! Mesozooplankton efficiency.
	210	! We adopt a formulation proposed by Mitra et al. (2007)
	211	! The gross growth efficiency is controled by the most limiting nutrient.
	212	! Growth is also further decreased when the food quality is poor. This is currently
	213	! hard coded : it can be decreased by up to 50% (zepsherq)
	214	! GGE can also be decreased when food quantity is high, zepsherf (Montagnes and
	215	! Fulton, 2012)
	216	! -----------------------------------------------------------------------------------
[10362]	217	zgrasrat = ( zgraztotf + rtrn )/ ( zgraztotc + rtrn )
	218	zgrasratn = ( zgraztotn + rtrn )/ ( zgraztotc + rtrn )
[4529]	219	zepshert = MIN( 1., zgrasratn, zgrasrat / ferat3)
[10362]	220	zbeta = MAX(0., (epsher2 - epsher2min) )
	221	zepsherf = epsher2min + zbeta / ( 1.0 + 0.04E6 * 12. * zfood * zbeta )
[12349]	222	zepsherq = 0.5 + (1.0 - 0.5) * zepshert * ( 1.0 + 1.0 ) / ( zepshert + 1.0 )
[12360]	223	zepsherv = zepsherf * zepshert * zepsherq
[12524]	224	!
	225	! Impact of grazing on the prognostic variables
	226	! ---------------------------------------------
[10362]	227	zmortz = ztortz + zrespz
[12537]	228	! Mortality induced by the upper trophic levels, ztortz, is allocated
	229	! according to a infinite chain of predators (ANderson et al., 2013)
[10362]	230	zmortzgoc = unass2 / ( 1. - epsher2 ) * ztortz + zrespz
[12524]	231	tra(ji,jj,jk,jpmes) = tra(ji,jj,jk,jpmes) - zmortz + zepsherv * zgraztotc
[3443]	232	tra(ji,jj,jk,jpdia) = tra(ji,jj,jk,jpdia) - zgrazd
	233	tra(ji,jj,jk,jpzoo) = tra(ji,jj,jk,jpzoo) - zgrazz
	234	tra(ji,jj,jk,jpphy) = tra(ji,jj,jk,jpphy) - zgrazn
[5385]	235	tra(ji,jj,jk,jpnch) = tra(ji,jj,jk,jpnch) - zgrazn * trb(ji,jj,jk,jpnch) / ( trb(ji,jj,jk,jpphy) + rtrn )
	236	tra(ji,jj,jk,jpdch) = tra(ji,jj,jk,jpdch) - zgrazd * trb(ji,jj,jk,jpdch) / ( trb(ji,jj,jk,jpdia) + rtrn )
	237	tra(ji,jj,jk,jpdsi) = tra(ji,jj,jk,jpdsi) - zgrazd * trb(ji,jj,jk,jpdsi) / ( trb(ji,jj,jk,jpdia) + rtrn )
	238	tra(ji,jj,jk,jpgsi) = tra(ji,jj,jk,jpgsi) + zgrazd * trb(ji,jj,jk,jpdsi) / ( trb(ji,jj,jk,jpdia) + rtrn )
[3443]	239	tra(ji,jj,jk,jpnfe) = tra(ji,jj,jk,jpnfe) - zgraznf
	240	tra(ji,jj,jk,jpdfe) = tra(ji,jj,jk,jpdfe) - zgrazf
[10362]	241	tra(ji,jj,jk,jppoc) = tra(ji,jj,jk,jppoc) - zgrazpoc - zgrazffep + zfrac
	242	prodpoc(ji,jj,jk) = prodpoc(ji,jj,jk) + zfrac
	243	conspoc(ji,jj,jk) = conspoc(ji,jj,jk) - zgrazpoc - zgrazffep
[12524]	244	tra(ji,jj,jk,jpgoc) = tra(ji,jj,jk,jpgoc) - zgrazffeg - zfrac
[10362]	245	consgoc(ji,jj,jk) = consgoc(ji,jj,jk) - zgrazffeg - zfrac
	246	tra(ji,jj,jk,jpsfe) = tra(ji,jj,jk,jpsfe) - zgrazpof - zgrazfffp + zfracfe
[12524]	247	tra(ji,jj,jk,jpbfe) = tra(ji,jj,jk,jpbfe) - zgrazfffg - zfracfe
	248	! Calcite remineralization due to zooplankton activity
[12537]	249	! part2 of the ingested calcite is dissolving in the acidic gut
[10362]	250	zfracal = trb(ji,jj,jk,jpcal) / (trb(ji,jj,jk,jppoc) + trb(ji,jj,jk,jpgoc) + rtrn )
	251	zgrazcal = (zgrazffeg + zgrazpoc) * (1. - part2) * zfracal
[12524]	252	! calcite production by zooplankton activity
[10362]	253	zprcaca = xfracal(ji,jj,jk) * zgrazn
	254	prodcal(ji,jj,jk) = prodcal(ji,jj,jk) + zprcaca ! prodcal=prodcal(nanophy)+prodcal(microzoo)+prodcal(mesozoo)
	255	!
	256	zprcaca = part2 * zprcaca
	257	tra(ji,jj,jk,jpdic) = tra(ji,jj,jk,jpdic) + zgrazcal - zprcaca
	258	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) - 2. * ( zgrazcal + zprcaca )
	259	tra(ji,jj,jk,jpcal) = tra(ji,jj,jk,jpcal) - zgrazcal + zprcaca
[12537]	260
	261	! Computation of total excretion and egestion by mesozoo.
[12524]	262	! ---------------------------------------------------------
	263	zgrarem(ji,jj,jk) = zgraztotc * ( 1. - zepsherv - unass2 ) &
	264	& + ( 1. - epsher2 - unass2 ) / ( 1. - epsher2 ) * ztortz
	265	zgraref(ji,jj,jk) = zgraztotc * MAX( 0. , ( 1. - unass2 ) * zgrasrat - ferat3 * zepsherv ) &
	266	& + ferat3 * ( ( 1. - epsher2 - unass2 ) /( 1. - epsher2 ) * ztortz )
	267	zgrapoc(ji,jj,jk) = zgraztotc * unass2 + zmortzgoc
	268	zgrapof(ji,jj,jk) = zgraztotf * unass2 + ferat3 * zmortzgoc
	269	END DO
	270	END DO
	271	END DO
	272
[12537]	273	! Computation of the effect of DVM by mesozooplankton
	274	! This part is only activated if ln_dvm_meso is set to true
	275	! The parameterization has been published in Gorgues et al. (2019).
	276	! -----------------------------------------------------------------
[12524]	277	IF (ln_dvm_meso) THEN
	278	ALLOCATE( zgramigrem(jpi,jpj), zgramigref(jpi,jpj), zgramigpoc(jpi,jpj), zgramigpof(jpi,jpj) )
	279	ALLOCATE( zstrn(jpi,jpj) )
	280	zgramigrem(:,:) = 0.0 ; zgramigref(:,:) = 0.0
	281	zgramigpoc(:,:) = 0.0 ; zgramigpof(:,:) = 0.0
	282
	283	! compute the day length depending on latitude and the day
	284	zrum = REAL( nday_year - 80, wp ) / REAL( nyear_len(1), wp )
	285	zcodel = ASIN( SIN( zrum * rpi * 2._wp ) * SIN( rad * 23.5_wp ) )
	286
	287	! day length in hours
	288	zstrn(:,:) = 0.
	289	DO jj = 1, jpj
	290	DO ji = 1, jpi
	291	zargu = TAN( zcodel ) * TAN( gphit(ji,jj) * rad )
	292	zargu = MAX( -1., MIN( 1., zargu ) )
	293	zstrn(ji,jj) = MAX( 0.0, 24. - 2. * ACOS( zargu ) / rad / 15. )
	294	zstrn(ji,jj) = MIN(0.75, MAX( 0.25, zstrn(ji,jj) / 24.) )
[3443]	295	END DO
	296	END DO
[12524]	297
[12537]	298	! Compute the amount of materials that will go into vertical migration
	299	! This fraction is sumed over the euphotic zone and is removed from
	300	! the fluxes driven by mesozooplankton in the euphotic zone.
	301	! --------------------------------------------------------------------
[12524]	302	DO jk = 1, jpk
	303	DO jj = 1, jpj
	304	DO ji = 1, jpi
	305	zmigreltime = (1. - zstrn(ji,jj))
	306	IF ( gdept_n(ji,jj,jk) <= heup(ji,jj) ) THEN
	307	zgramigrem(ji,jj) = zgramigrem(ji,jj) + xfracmig * zgrarem(ji,jj,jk) * (1. - zmigreltime ) &
	308	& * e3t_n(ji,jj,jk) * tmask(ji,jj,jk)
	309	zgramigref(ji,jj) = zgramigref(ji,jj) + xfracmig * zgraref(ji,jj,jk) * (1. - zmigreltime ) &
	310	& * e3t_n(ji,jj,jk) * tmask(ji,jj,jk)
	311	zgramigpoc(ji,jj) = zgramigpoc(ji,jj) + xfracmig * zgrapoc(ji,jj,jk) * (1. - zmigreltime ) &
	312	& * e3t_n(ji,jj,jk) * tmask(ji,jj,jk)
	313	zgramigpof(ji,jj) = zgramigpof(ji,jj) + xfracmig * zgrapof(ji,jj,jk) * (1. - zmigreltime ) &
	314	& * e3t_n(ji,jj,jk) * tmask(ji,jj,jk)
	315
	316	zgrarem(ji,jj,jk) = zgrarem(ji,jj,jk) * ( (1.0 - xfracmig) + xfracmig * zmigreltime )
	317	zgraref(ji,jj,jk) = zgraref(ji,jj,jk) * ( (1.0 - xfracmig) + xfracmig * zmigreltime )
	318	zgrapoc(ji,jj,jk) = zgrapoc(ji,jj,jk) * ( (1.0 - xfracmig) + xfracmig * zmigreltime )
	319	zgrapof(ji,jj,jk) = zgrapof(ji,jj,jk) * ( (1.0 - xfracmig) + xfracmig * zmigreltime )
	320	ENDIF
	321	END DO
	322	END DO
	323	END DO
	324
[12537]	325	! The inorganic and organic fluxes induced by migrating organisms are added at the
	326	! the migration depth (corresponding indice is set by kmig)
	327	! --------------------------------------------------------------------------------
[12524]	328	DO jj = 1, jpj
	329	DO ji = 1, jpi
	330	IF (tmask(ji,jj,1) == 1.) THEN
	331	jkt = kmig(ji,jj)
	332	zgrarem(ji,jj,jkt) = zgrarem(ji,jj,jkt) + zgramigrem(ji,jj) / e3t_n(ji,jj,jkt)
	333	zgraref(ji,jj,jkt) = zgraref(ji,jj,jkt) + zgramigref(ji,jj) / e3t_n(ji,jj,jkt)
	334	zgrapoc(ji,jj,jkt) = zgrapoc(ji,jj,jkt) + zgramigpoc(ji,jj) / e3t_n(ji,jj,jkt)
	335	zgrapof(ji,jj,jkt) = zgrapof(ji,jj,jkt) + zgramigpof(ji,jj) / e3t_n(ji,jj,jkt)
	336	ENDIF
	337	END DO
	338	END DO
	339	!
	340	! Deallocate temporary variables
	341	! ------------------------------
	342	DEALLOCATE( zgramigrem, zgramigref, zgramigpoc, zgramigpof )
	343	DEALLOCATE( zstrn )
	344
[12537]	345	! End of the ln_dvm_meso part
[12524]	346	ENDIF
	347
	348	DO jk = 1, jpk
	349	DO jj = 1, jpj
	350	DO ji = 1, jpi
	351	! Update the arrays TRA which contain the biological sources and sinks
[12537]	352	! This only concerns the variables which are affected by DVM (inorganic
	353	! nutrients, DOC agands, and particulate organic carbon).
[12524]	354	zgrarsig = zgrarem(ji,jj,jk) * sigma2
	355	tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) + zgrarsig
	356	tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) + zgrarsig
	357	tra(ji,jj,jk,jpdoc) = tra(ji,jj,jk,jpdoc) + zgrarem(ji,jj,jk) - zgrarsig
	358	!
	359	IF( ln_ligand ) THEN
	360	tra(ji,jj,jk,jplgw) = tra(ji,jj,jk,jplgw) + (zgrarem(ji,jj,jk) - zgrarsig) * ldocz
	361	zz2ligprod(ji,jj,jk) = (zgrarem(ji,jj,jk) - zgrarsig) * ldocz
	362	ENDIF
	363	!
	364	tra(ji,jj,jk,jpoxy) = tra(ji,jj,jk,jpoxy) - o2ut * zgrarsig
	365	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) + zgraref(ji,jj,jk)
	366	zfezoo2(ji,jj,jk) = zgraref(ji,jj,jk)
	367	tra(ji,jj,jk,jpdic) = tra(ji,jj,jk,jpdic) + zgrarsig
	368	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + rno3 * zgrarsig
	369	tra(ji,jj,jk,jpgoc) = tra(ji,jj,jk,jpgoc) + zgrapoc(ji,jj,jk)
	370	prodgoc(ji,jj,jk) = prodgoc(ji,jj,jk) + zgrapoc(ji,jj,jk)
	371	tra(ji,jj,jk,jpbfe) = tra(ji,jj,jk,jpbfe) + zgrapof(ji,jj,jk)
	372	END DO
	373	END DO
[3443]	374	END DO
	375	!
[12537]	376	! Write the output
[5385]	377	IF( lk_iomput .AND. knt == nrdttrc ) THEN
[9125]	378	ALLOCATE( zw3d(jpi,jpj,jpk) )
[4996]	379	IF( iom_use( "GRAZ2" ) ) THEN
[7753]	380	zw3d(:,:,:) = zgrazing(:,:,:) * 1.e+3 * rfact2r * tmask(:,:,:) ! Total grazing of phyto by zooplankton
[4996]	381	CALL iom_put( "GRAZ2", zw3d )
	382	ENDIF
	383	IF( iom_use( "PCAL" ) ) THEN
[7753]	384	zw3d(:,:,:) = prodcal(:,:,:) * 1.e+3 * rfact2r * tmask(:,:,:) ! Calcite production
[4996]	385	CALL iom_put( "PCAL", zw3d )
	386	ENDIF
[10362]	387	IF( iom_use( "FEZOO2" ) ) THEN
	388	zw3d(:,:,:) = zfezoo2(:,:,:) * 1e9 * 1.e+3 * rfact2r * tmask(:,:,:) !
	389	CALL iom_put( "FEZOO2", zw3d )
	390	ENDIF
	391	IF( iom_use( "LPRODZ2" ) .AND. ln_ligand ) THEN
	392	zw3d(:,:,:) = zz2ligprod(:,:,:) * 1e9 * 1.e+3 * rfact2r * tmask(:,:,:)
	393	CALL iom_put( "LPRODZ2" , zw3d )
	394	ENDIF
[9125]	395	DEALLOCATE( zw3d )
[3443]	396	ENDIF
	397	!
[10367]	398	IF (ln_ligand) DEALLOCATE( zz2ligprod )
	399	!
[3443]	400	IF(ln_ctl) THEN ! print mean trends (used for debugging)
	401	WRITE(charout, FMT="('meso')")
	402	CALL prt_ctl_trc_info(charout)
	403	CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm)
	404	ENDIF
	405	!
[9124]	406	IF( ln_timing ) CALL timing_stop('p4z_meso')
[3443]	407	!
	408	END SUBROUTINE p4z_meso
	409
[9124]	410
[3443]	411	SUBROUTINE p4z_meso_init
	412	!!----------------------------------------------------------------------
	413	!! * ROUTINE p4z_meso_init *
	414	!!
	415	!! ** Purpose : Initialization of mesozooplankton parameters
	416	!!
[12537]	417	!! ** Method : Read the namp4zmes namelist and check the parameters
[3443]	418	!! called at the first timestep (nittrc000)
	419	!!
	420	!! ** input : Namelist nampismes
	421	!!----------------------------------------------------------------------
[9124]	422	INTEGER :: ios ! Local integer
	423	!
[10362]	424	NAMELIST/namp4zmes/ part2, grazrat2, resrat2, mzrat2, xpref2n, xpref2d, xpref2z, &
	425	& xpref2c, xthresh2dia, xthresh2phy, xthresh2zoo, xthresh2poc, &
[12524]	426	& xthresh2, xkgraz2, epsher2, epsher2min, sigma2, unass2, grazflux, ln_dvm_meso, &
	427	& xfracmig
[9124]	428	!!----------------------------------------------------------------------
	429	!
[9169]	430	IF(lwp) THEN
	431	WRITE(numout,*)
	432	WRITE(numout,*) 'p4z_meso_init : Initialization of mesozooplankton parameters'
	433	WRITE(numout,*) '~~~~~~~~~~~~~'
	434	ENDIF
	435	!
[12537]	436	REWIND( numnatp_ref ) ! Namelist namp4zmes in reference namelist : Pisces mesozooplankton
[7646]	437	READ ( numnatp_ref, namp4zmes, IOSTAT = ios, ERR = 901)
[11536]	438	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namp4zmes in reference namelist' )
[12537]	439	REWIND( numnatp_cfg ) ! Namelist namp4zmes in configuration namelist : Pisces mesozooplankton
[7646]	440	READ ( numnatp_cfg, namp4zmes, IOSTAT = ios, ERR = 902 )
[11536]	441	902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namp4zmes in configuration namelist' )
[9169]	442	IF(lwm) WRITE( numonp, namp4zmes )
[9124]	443	!
[3443]	444	IF(lwp) THEN ! control print
[9169]	445	WRITE(numout,*) ' Namelist : namp4zmes'
	446	WRITE(numout,*) ' part of calcite not dissolved in mesozoo guts part2 =', part2
[10362]	447	WRITE(numout,*) ' mesozoo preference for phyto xpref2n =', xpref2n
	448	WRITE(numout,*) ' mesozoo preference for diatoms xpref2d =', xpref2d
	449	WRITE(numout,*) ' mesozoo preference for zoo xpref2z =', xpref2z
	450	WRITE(numout,*) ' mesozoo preference for poc xpref2c =', xpref2c
[9169]	451	WRITE(numout,*) ' microzoo feeding threshold for mesozoo xthresh2zoo =', xthresh2zoo
	452	WRITE(numout,*) ' diatoms feeding threshold for mesozoo xthresh2dia =', xthresh2dia
	453	WRITE(numout,*) ' nanophyto feeding threshold for mesozoo xthresh2phy =', xthresh2phy
	454	WRITE(numout,*) ' poc feeding threshold for mesozoo xthresh2poc =', xthresh2poc
	455	WRITE(numout,*) ' feeding threshold for mesozooplankton xthresh2 =', xthresh2
	456	WRITE(numout,*) ' exsudation rate of mesozooplankton resrat2 =', resrat2
	457	WRITE(numout,*) ' mesozooplankton mortality rate mzrat2 =', mzrat2
	458	WRITE(numout,*) ' maximal mesozoo grazing rate grazrat2 =', grazrat2
	459	WRITE(numout,*) ' mesozoo flux feeding rate grazflux =', grazflux
	460	WRITE(numout,*) ' non assimilated fraction of P by mesozoo unass2 =', unass2
[10362]	461	WRITE(numout,*) ' Efficiency of Mesozoo growth epsher2 =', epsher2
[12524]	462	WRITE(numout,*) ' Minimum Efficiency of Mesozoo growth epsher2min =', epsher2min
[9169]	463	WRITE(numout,*) ' Fraction of mesozoo excretion as DOM sigma2 =', sigma2
	464	WRITE(numout,*) ' half sturation constant for grazing 2 xkgraz2 =', xkgraz2
[12524]	465	WRITE(numout,*) ' Diurnal vertical migration of mesozoo. ln_dvm_meso =', ln_dvm_meso
	466	WRITE(numout,*) ' Fractional biomass of meso that performs DVM xfracmig =', xfracmig
[3443]	467	ENDIF
[9124]	468	!
[3443]	469	END SUBROUTINE p4z_meso_init
	470
[12524]	471	SUBROUTINE p4z_meso_depmig
	472	!!----------------------------------------------------------------------
	473	!! * ROUTINE p4z_meso_depmig *
	474	!!
	475	!! ** Purpose : Computation the migration depth of mesozooplankton
	476	!!
	477	!! ** Method : Computes the DVM depth of mesozooplankton from oxygen
	478	!! temperature and chlorophylle following the parameterization
	479	!! proposed by Bianchi et al. (2013)
	480	!!----------------------------------------------------------------------
	481	INTEGER :: ji, jj, jk
	482	!
	483	REAL(wp) :: totchl
	484	REAL(wp), DIMENSION(jpi,jpj) :: oxymoy, tempmoy, zdepmoy
	485
	486	!!---------------------------------------------------------------------
	487	!
	488	IF( ln_timing == 1 ) CALL timing_start('p4z_meso_zdepmig')
	489	!
	490	oxymoy(:,:) = 0.
	491	tempmoy(:,:) = 0.
	492	zdepmoy(:,:) = 0.
	493	depmig (:,:) = 5.
	494	kmig (:,:) = 1
	495	!
	496	! Compute the averaged values of oxygen, temperature over the domain
	497	! 150m to 500 m depth.
[12537]	498	! ------------------------------------------------------------------
[12524]	499	DO jk =1, jpk
	500	DO jj = 1, jpj
	501	DO ji = 1, jpi
	502	IF (tmask(ji,jj,jk) == 1.) THEN
	503	IF (gdept_n(ji,jj,jk) >= 150. .AND. gdept_n(ji,jj,jk) <= 500.) THEN
	504	oxymoy(ji,jj) = oxymoy(ji,jj) + trb(ji,jj,jk,jpoxy)e3t_n(ji,jj,jk)1E6
	505	tempmoy(ji,jj) = tempmoy(ji,jj) + tsn(ji,jj,jk,jp_tem)*e3t_n(ji,jj,jk)
	506	zdepmoy(ji,jj) = zdepmoy(ji,jj) + e3t_n(ji,jj,jk)
	507	ENDIF
	508	ENDIF
	509	END DO
	510	END DO
	511	END DO
	512
[12537]	513	! Compute the difference between surface values and the mean values in the mesopelagic
	514	! domain
	515	! ------------------------------------------------------------------------------------
[12524]	516	DO jj = 1, jpj
	517	DO ji = 1, jpi
	518	oxymoy(ji,jj) = trb(ji,jj,1,jpoxy)*1E6 - oxymoy(ji,jj) / (zdepmoy(ji,jj) + rtrn)
	519	tempmoy(ji,jj) = tsn(ji,jj,1,jp_tem)-tempmoy(ji,jj) / (zdepmoy(ji,jj) + rtrn)
	520	END DO
	521	END DO
	522	!
	523	! Computation of the migration depth based on the parameterization of
	524	! Bianchi et al. (2013)
	525	! -------------------------------------------------------------------
	526	DO jj = 1, jpj
	527	DO ji = 1, jpi
	528	IF (tmask(ji,jj,1) == 1.) THEN
	529	totchl = (trb(ji,jj,1,jpnch)+trb(ji,jj,1,jpdch))*1E6
	530	depmig(ji,jj) = 398. - 0.56 * oxymoy(ji,jj) -115. * log10(totchl) + 0.36 * hmld(ji,jj) -2.4 * tempmoy(ji,jj)
	531	ENDIF
	532	END DO
	533	END DO
	534	!
	535	! Computation of the corresponding jk indice
	536	! ------------------------------------------
	537	DO jk = 1, jpk-1
	538	DO jj = 1, jpj
	539	DO ji = 1, jpi
	540	IF (depmig(ji,jj) .GE. gdepw_n(ji,jj,jk) .AND. depmig(ji,jj) .LT. gdepw_n(ji,jj,jk+1) ) THEN
	541	kmig(ji,jj) = jk
	542	ENDIF
	543	END DO
	544	END DO
	545	END DO
	546	!
	547	! Correction of the migration depth and indice based on O2 levels
	548	! If O2 is too low, imposing a migration depth at this low O2 levels
	549	! would lead to negative O2 concentrations (respiration while O2 is close
	550	! to 0. Thus, to avoid that problem, the migration depth is adjusted so
	551	! that it falls above the OMZ
	552	! -----------------------------------------------------------------------
	553	DO ji =1, jpi
	554	DO jj = 1, jpj
	555	IF (trb(ji,jj,kmig(ji,jj),jpoxy) < 5E-6) THEN
	556	DO jk = kmig(ji,jj),1,-1
	557	IF (trb(ji,jj,jk,jpoxy) >= 5E-6 .AND. trb(ji,jj,jk+1,jpoxy) < 5E-6) THEN
	558	kmig(ji,jj) = jk
	559	depmig(ji,jj) = gdept_n(ji,jj,jk)
	560	ENDIF
	561	END DO
	562	ENDIF
	563	END DO
	564	END DO
	565	!
	566	IF( ln_timing ) CALL timing_stop('p4z_meso_depmig')
	567	!
	568	END SUBROUTINE p4z_meso_depmig
	569
	570	INTEGER FUNCTION p4z_meso_alloc()
	571	!!----------------------------------------------------------------------
	572	!! * ROUTINE p4z_meso_alloc *
	573	!!----------------------------------------------------------------------
	574	!
	575	ALLOCATE( depmig(jpi,jpj), kmig(jpi,jpj), STAT= p4z_meso_alloc )
	576	!
	577	IF( p4z_meso_alloc /= 0 ) CALL ctl_stop( 'STOP', 'p4z_meso_alloc : failed to allocate arrays.' )
	578	!
	579	END FUNCTION p4z_meso_alloc
	580
[3443]	581	!!======================================================================
[5656]	582	END MODULE p4zmeso

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