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p4zsed.F90 in branches/2016/dev_r7012_ROBUST5_CNRS/NEMOGCM/NEMO/TOP_SRC/PISCES/P4Z – NEMO

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source: branches/2016/dev_r7012_ROBUST5_CNRS/NEMOGCM/NEMO/TOP_SRC/PISCES/P4Z/p4zsed.F90 @ 7041

Last change on this file since 7041 was 7041, checked in by cetlod, 8 years ago
ROBUST5_CNRS : implementation of part I of new TOP interface - 1st step -, see ticket #1782
Property svn:keywords set to `Id`
File size: 19.5 KB

Rev	Line
[3443]	1	MODULE p4zsed
	2	!!======================================================================
	3	!! * MODULE p4sed *
	4	!! TOP : PISCES Compute loss of organic matter in the sediments
	5	!!======================================================================
	6	!! History : 1.0 ! 2004-03 (O. Aumont) Original code
	7	!! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90
	8	!! 3.4 ! 2011-06 (C. Ethe) USE of fldread
	9	!! 3.5 ! 2012-07 (O. Aumont) improvment of river input of nutrients
	10	!!----------------------------------------------------------------------
	11	#if defined key_pisces
	12	!!----------------------------------------------------------------------
	13	!! 'key_pisces' PISCES bio-model
	14	!!----------------------------------------------------------------------
	15	!! p4z_sed : Compute loss of organic matter in the sediments
	16	!!----------------------------------------------------------------------
	17	USE oce_trc ! shared variables between ocean and passive tracers
	18	USE trc ! passive tracers common variables
	19	USE sms_pisces ! PISCES Source Minus Sink variables
	20	USE p4zsink ! vertical flux of particulate matter due to sinking
	21	USE p4zopt ! optical model
	22	USE p4zlim ! Co-limitations of differents nutrients
	23	USE p4zsbc ! External source of nutrients
	24	USE p4zint ! interpolation and computation of various fields
	25	USE iom ! I/O manager
	26	USE prtctl_trc ! print control for debugging
	27
	28	IMPLICIT NONE
	29	PRIVATE
	30
[5385]	31	PUBLIC p4z_sed
	32	PUBLIC p4z_sed_alloc
	33
	34	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: nitrpot !: Nitrogen fixation
	35	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,: ) :: sdenit !: Nitrate reduction in the sediments
[3443]	36	REAL(wp) :: r1_rday !: inverse of rday
	37
	38	!!----------------------------------------------------------------------
	39	!! NEMO/TOP 3.3 , NEMO Consortium (2010)
[5215]	40	!! $Id$
[3443]	41	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
	42	!!----------------------------------------------------------------------
	43	CONTAINS
	44
[5385]	45	SUBROUTINE p4z_sed( kt, knt )
[3443]	46	!!---------------------------------------------------------------------
	47	!! * ROUTINE p4z_sed *
	48	!!
	49	!! ** Purpose : Compute loss of organic matter in the sediments. This
	50	!! is by no way a sediment model. The loss is simply
	51	!! computed to balance the inout from rivers and dust
	52	!!
	53	!! ** Method : - ???
	54	!!---------------------------------------------------------------------
	55	!
[5385]	56	INTEGER, INTENT(in) :: kt, knt ! ocean time step
[3443]	57	INTEGER :: ji, jj, jk, ikt
	58	#if ! defined key_sed
	59	REAL(wp) :: zsumsedsi, zsumsedpo4, zsumsedcal
	60	REAL(wp) :: zrivalk, zrivsil, zrivno3
	61	#endif
	62	REAL(wp) :: zwflux, zfminus, zfplus
	63	REAL(wp) :: zlim, zfact, zfactcal
[4148]	64	REAL(wp) :: zo2, zno3, zflx, zpdenit, z1pdenit, zdenitt, zolimit
[4521]	65	REAL(wp) :: zsiloss, zcaloss, zws3, zws4, zwsc, zdep, zwstpoc
[4529]	66	REAL(wp) :: ztrfer, ztrpo4, zwdust, zlight
[3531]	67	!
[3443]	68	CHARACTER (len=25) :: charout
[5385]	69	REAL(wp), POINTER, DIMENSION(:,: ) :: zpdep, zsidep, zwork1, zwork2, zwork3
[4529]	70	REAL(wp), POINTER, DIMENSION(:,: ) :: zdenit2d, zironice, zbureff
[4521]	71	REAL(wp), POINTER, DIMENSION(:,: ) :: zwsbio3, zwsbio4, zwscal
[5385]	72	REAL(wp), POINTER, DIMENSION(:,:,:) :: zirondep, zsoufer
[3443]	73	!!---------------------------------------------------------------------
	74	!
	75	IF( nn_timing == 1 ) CALL timing_start('p4z_sed')
	76	!
[5385]	77	IF( kt == nittrc000 .AND. knt == 1 ) r1_rday = 1. / rday
[3443]	78	!
	79	! Allocate temporary workspace
[5385]	80	CALL wrk_alloc( jpi, jpj, zdenit2d, zwork1, zwork2, zwork3, zbureff )
[4521]	81	CALL wrk_alloc( jpi, jpj, zwsbio3, zwsbio4, zwscal )
[5385]	82	CALL wrk_alloc( jpi, jpj, jpk, zsoufer )
[4521]	83
[3443]	84	zdenit2d(:,:) = 0.e0
[4529]	85	zbureff (:,:) = 0.e0
[4800]	86	zwork1 (:,:) = 0.e0
	87	zwork2 (:,:) = 0.e0
	88	zwork3 (:,:) = 0.e0
[3443]	89
	90	! Iron input/uptake due to sea ice : Crude parameterization based on Lancelot et al.
	91	! ----------------------------------------------------
	92	IF( ln_ironice ) THEN
	93	!
	94	CALL wrk_alloc( jpi, jpj, zironice )
	95	!
	96	DO jj = 1, jpj
	97	DO ji = 1, jpi
[6140]	98	zdep = rfact2 / e3t_n(ji,jj,1)
[4148]	99	zwflux = fmmflx(ji,jj) / 1000._wp
[5385]	100	zfminus = MIN( 0._wp, -zwflux ) * trb(ji,jj,1,jpfer) * zdep
[4148]	101	zfplus = MAX( 0._wp, -zwflux ) * icefeinput * zdep
[3443]	102	zironice(ji,jj) = zfplus + zfminus
	103	END DO
	104	END DO
	105	!
[5385]	106	tra(:,:,1,jpfer) = tra(:,:,1,jpfer) + zironice(:,:)
[4996]	107	!
[5385]	108	IF( lk_iomput .AND. knt == nrdttrc .AND. iom_use( "Ironice" ) ) &
[6140]	109	& CALL iom_put( "Ironice", zironice(:,:) * 1.e+3 * rfact2r * e3t_n(:,:,1) * tmask(:,:,1) ) ! iron flux from ice
[4996]	110	!
[3443]	111	CALL wrk_dealloc( jpi, jpj, zironice )
	112	!
	113	ENDIF
	114
	115	! Add the external input of nutrients from dust deposition
	116	! ----------------------------------------------------------
	117	IF( ln_dust ) THEN
	118	!
	119	CALL wrk_alloc( jpi, jpj, zpdep, zsidep )
	120	CALL wrk_alloc( jpi, jpj, jpk, zirondep )
	121	! ! Iron and Si deposition at the surface
	122	IF( ln_solub ) THEN
[6140]	123	zirondep(:,:,1) = solub(:,:) * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 55.85 + 3.e-10 * r1_ryyss
[3443]	124	ELSE
[6140]	125	zirondep(:,:,1) = dustsolub * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 55.85 + 3.e-10 * r1_ryyss
[3443]	126	ENDIF
[6140]	127	zsidep(:,:) = 8.8 * 0.075 * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 28.1
	128	zpdep (:,:) = 0.1 * 0.021 * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 31. / po4r
[3443]	129	! ! Iron solubilization of particles in the water column
[4529]	130	! ! dust in kg/m2/s ---> 1/55.85 to put in mol/Fe ; wdust in m/j
	131	zwdust = 0.03 * rday / ( wdust * 55.85 ) / ( 270. * rday )
[3443]	132	DO jk = 2, jpkm1
[6140]	133	zirondep(:,:,jk) = dust(:,:) * mfrac * zwdust * rfact2 * EXP( -gdept_n(:,:,jk) / 540. )
[3443]	134	END DO
	135	! ! Iron solubilization of particles in the water column
[5385]	136	tra(:,:,1,jppo4) = tra(:,:,1,jppo4) + zpdep (:,:)
	137	tra(:,:,1,jpsil) = tra(:,:,1,jpsil) + zsidep (:,:)
	138	tra(:,:,:,jpfer) = tra(:,:,:,jpfer) + zirondep(:,:,:)
[4996]	139	!
	140	IF( lk_iomput ) THEN
[5385]	141	IF( knt == nrdttrc ) THEN
[4996]	142	IF( iom_use( "Irondep" ) ) &
[6140]	143	& CALL iom_put( "Irondep", zirondep(:,:,1) * 1.e+3 * rfact2r * e3t_n(:,:,1) * tmask(:,:,1) ) ! surface downward dust depo of iron
[4996]	144	IF( iom_use( "pdust" ) ) &
	145	& CALL iom_put( "pdust" , dust(:,:) / ( wdust * rday ) * tmask(:,:,1) ) ! dust concentration at surface
[3443]	146	ENDIF
	147	ENDIF
	148	CALL wrk_dealloc( jpi, jpj, zpdep, zsidep )
	149	CALL wrk_dealloc( jpi, jpj, jpk, zirondep )
	150	!
	151	ENDIF
	152
	153	! Add the external input of nutrients from river
	154	! ----------------------------------------------------------
	155	IF( ln_river ) THEN
[5385]	156	DO jj = 1, jpj
	157	DO ji = 1, jpi
	158	DO jk = 1, nk_rnf(ji,jj)
	159	tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) + rivdip(ji,jj) * rfact2
	160	tra(ji,jj,jk,jpno3) = tra(ji,jj,jk,jpno3) + rivdin(ji,jj) * rfact2
	161	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) + rivdic(ji,jj) * 5.e-5 * rfact2
	162	tra(ji,jj,jk,jpsil) = tra(ji,jj,jk,jpsil) + rivdsi(ji,jj) * rfact2
	163	tra(ji,jj,jk,jpdic) = tra(ji,jj,jk,jpdic) + rivdic(ji,jj) * rfact2
	164	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + ( rivalk(ji,jj) - rno3 * rivdin(ji,jj) ) * rfact2
	165	ENDDO
	166	ENDDO
	167	ENDDO
[3443]	168	ENDIF
	169
	170	! Add the external input of nutrients from nitrogen deposition
	171	! ----------------------------------------------------------
	172	IF( ln_ndepo ) THEN
[5385]	173	tra(:,:,1,jpno3) = tra(:,:,1,jpno3) + nitdep(:,:) * rfact2
	174	tra(:,:,1,jptal) = tra(:,:,1,jptal) - rno3 * nitdep(:,:) * rfact2
[3443]	175	ENDIF
	176
	177	! Add the external input of iron from sediment mobilization
	178	! ------------------------------------------------------
	179	IF( ln_ironsed ) THEN
[5385]	180	tra(:,:,:,jpfer) = tra(:,:,:,jpfer) + ironsed(:,:,:) * rfact2
[3443]	181	!
[5385]	182	IF( lk_iomput .AND. knt == nrdttrc .AND. iom_use( "Ironsed" ) ) &
[3446]	183	& CALL iom_put( "Ironsed", ironsed(:,:,:) * 1.e+3 * tmask(:,:,:) ) ! iron inputs from sediments
[3443]	184	ENDIF
	185
	186	! Add the external input of iron from hydrothermal vents
	187	! ------------------------------------------------------
	188	IF( ln_hydrofe ) THEN
[5385]	189	tra(:,:,:,jpfer) = tra(:,:,:,jpfer) + hydrofe(:,:,:) * rfact2
[3443]	190	!
[5385]	191	IF( lk_iomput .AND. knt == nrdttrc .AND. iom_use( "HYDR" ) ) &
[3446]	192	& CALL iom_put( "HYDR", hydrofe(:,:,:) * 1.e+3 * tmask(:,:,:) ) ! hydrothermal iron input
[3443]	193	ENDIF
	194
[7041]	195	! OA: Warning, the following part is necessary to avoid CFL problems above the sediments
[4521]	196	! --------------------------------------------------------------------
	197	DO jj = 1, jpj
	198	DO ji = 1, jpi
	199	ikt = mbkt(ji,jj)
[6140]	200	zdep = e3t_n(ji,jj,ikt) / xstep
[4521]	201	zwsbio4(ji,jj) = MIN( 0.99 * zdep, wsbio4(ji,jj,ikt) )
	202	zwscal (ji,jj) = MIN( 0.99 * zdep, wscal (ji,jj,ikt) )
	203	zwsbio3(ji,jj) = MIN( 0.99 * zdep, wsbio3(ji,jj,ikt) )
	204	END DO
	205	END DO
	206
[3443]	207	#if ! defined key_sed
[3475]	208	! Computation of the sediment denitrification proportion: The metamodel from midlleburg (2006) is being used
[4529]	209	! Computation of the fraction of organic matter that is permanently buried from Dunne's model
[3443]	210	! -------------------------------------------------------
	211	DO jj = 1, jpj
	212	DO ji = 1, jpi
	213	IF( tmask(ji,jj,1) == 1 ) THEN
	214	ikt = mbkt(ji,jj)
[5385]	215	zflx = ( trb(ji,jj,ikt,jpgoc) * zwsbio4(ji,jj) &
	216	& + trb(ji,jj,ikt,jppoc) * zwsbio3(ji,jj) ) * 1E3 * 1E6 / 1E4
[3443]	217	zflx = LOG10( MAX( 1E-3, zflx ) )
[5385]	218	zo2 = LOG10( MAX( 10. , trb(ji,jj,ikt,jpoxy) * 1E6 ) )
	219	zno3 = LOG10( MAX( 1. , trb(ji,jj,ikt,jpno3) * 1E6 * rno3 ) )
[6140]	220	zdep = LOG10( gdepw_n(ji,jj,ikt+1) )
[3443]	221	zdenit2d(ji,jj) = -2.2567 - 1.185 * zflx - 0.221 * zflx*2 - 0.3995 zno3 * zo2 + 1.25 * zno3 &
	222	& + 0.4721 * zo2 - 0.0996 * zdep + 0.4256 * zflx * zo2
	223	zdenit2d(ji,jj) = 10.0**( zdenit2d(ji,jj) )
[4529]	224	!
[5385]	225	zflx = ( trb(ji,jj,ikt,jpgoc) * zwsbio4(ji,jj) &
	226	& + trb(ji,jj,ikt,jppoc) * zwsbio3(ji,jj) ) * 1E6
[4529]	227	zbureff(ji,jj) = 0.013 + 0.53 * zflx2 / ( 7.0 + zflx )2
[3443]	228	ENDIF
	229	END DO
	230	END DO
[4529]	231
[3443]	232	! Loss of biogenic silicon, Caco3 organic carbon in the sediments.
	233	! First, the total loss is computed.
	234	! The factor for calcite comes from the alkalinity effect
	235	! -------------------------------------------------------------
	236	DO jj = 1, jpj
	237	DO ji = 1, jpi
[4800]	238	IF( tmask(ji,jj,1) == 1 ) THEN
	239	ikt = mbkt(ji,jj)
[5385]	240	zwork1(ji,jj) = trb(ji,jj,ikt,jpgsi) * zwsbio4(ji,jj)
	241	zwork2(ji,jj) = trb(ji,jj,ikt,jpgoc) * zwsbio4(ji,jj) + trb(ji,jj,ikt,jppoc) * zwsbio3(ji,jj)
[4800]	242	! For calcite, burial efficiency is made a function of saturation
	243	zfactcal = MIN( excess(ji,jj,ikt), 0.2 )
	244	zfactcal = MIN( 1., 1.3 * ( 0.2 - zfactcal ) / ( 0.4 - zfactcal ) )
[5385]	245	zwork3(ji,jj) = trb(ji,jj,ikt,jpcal) * zwscal(ji,jj) * 2.e0 * zfactcal
[4800]	246	ENDIF
[3443]	247	END DO
	248	END DO
	249	zsumsedsi = glob_sum( zwork1(:,:) * e1e2t(:,:) ) * r1_rday
	250	zsumsedpo4 = glob_sum( zwork2(:,:) * e1e2t(:,:) ) * r1_rday
	251	zsumsedcal = glob_sum( zwork3(:,:) * e1e2t(:,:) ) * r1_rday
	252	#endif
	253
[4148]	254	! This loss is scaled at each bottom grid cell for equilibrating the total budget of silica in the ocean.
	255	! Thus, the amount of silica lost in the sediments equal the supply at the surface (dust+rivers)
[3443]	256	! ------------------------------------------------------
	257	#if ! defined key_sed
[4641]	258	zrivsil = 1._wp - ( sumdepsi + rivdsiinput * r1_ryyss ) / ( zsumsedsi + rtrn )
[3443]	259	#endif
	260
	261	DO jj = 1, jpj
	262	DO ji = 1, jpi
	263	ikt = mbkt(ji,jj)
[6140]	264	zdep = xstep / e3t_n(ji,jj,ikt)
[4521]	265	zws4 = zwsbio4(ji,jj) * zdep
	266	zwsc = zwscal (ji,jj) * zdep
[5385]	267	zsiloss = trb(ji,jj,ikt,jpgsi) * zwsc
	268	zcaloss = trb(ji,jj,ikt,jpcal) * zwsc
[3443]	269	!
[5385]	270	tra(ji,jj,ikt,jpgsi) = tra(ji,jj,ikt,jpgsi) - zsiloss
	271	tra(ji,jj,ikt,jpcal) = tra(ji,jj,ikt,jpcal) - zcaloss
[3443]	272	#if ! defined key_sed
[5385]	273	tra(ji,jj,ikt,jpsil) = tra(ji,jj,ikt,jpsil) + zsiloss * zrivsil
[3443]	274	zfactcal = MIN( excess(ji,jj,ikt), 0.2 )
	275	zfactcal = MIN( 1., 1.3 * ( 0.2 - zfactcal ) / ( 0.4 - zfactcal ) )
[4641]	276	zrivalk = 1._wp - ( rivalkinput * r1_ryyss ) * zfactcal / ( zsumsedcal + rtrn )
[5385]	277	tra(ji,jj,ikt,jptal) = tra(ji,jj,ikt,jptal) + zcaloss * zrivalk * 2.0
	278	tra(ji,jj,ikt,jpdic) = tra(ji,jj,ikt,jpdic) + zcaloss * zrivalk
[3443]	279	#endif
	280	END DO
	281	END DO
	282
	283	DO jj = 1, jpj
	284	DO ji = 1, jpi
[5385]	285	ikt = mbkt(ji,jj)
[6140]	286	zdep = xstep / e3t_n(ji,jj,ikt)
[4521]	287	zws4 = zwsbio4(ji,jj) * zdep
	288	zws3 = zwsbio3(ji,jj) * zdep
[4529]	289	zrivno3 = 1. - zbureff(ji,jj)
[5385]	290	tra(ji,jj,ikt,jpgoc) = tra(ji,jj,ikt,jpgoc) - trb(ji,jj,ikt,jpgoc) * zws4
	291	tra(ji,jj,ikt,jppoc) = tra(ji,jj,ikt,jppoc) - trb(ji,jj,ikt,jppoc) * zws3
	292	tra(ji,jj,ikt,jpbfe) = tra(ji,jj,ikt,jpbfe) - trb(ji,jj,ikt,jpbfe) * zws4
	293	tra(ji,jj,ikt,jpsfe) = tra(ji,jj,ikt,jpsfe) - trb(ji,jj,ikt,jpsfe) * zws3
	294	zwstpoc = trb(ji,jj,ikt,jpgoc) * zws4 + trb(ji,jj,ikt,jppoc) * zws3
[3443]	295
	296	#if ! defined key_sed
[4148]	297	! The 0.5 factor in zpdenit and zdenitt is to avoid negative NO3 concentration after both denitrification
	298	! in the sediments and just above the sediments. Not very clever, but simpliest option.
[5385]	299	zpdenit = MIN( 0.5 * ( trb(ji,jj,ikt,jpno3) - rtrn ) / rdenit, zdenit2d(ji,jj) * zwstpoc * zrivno3 )
[3443]	300	z1pdenit = zwstpoc * zrivno3 - zpdenit
[5385]	301	zolimit = MIN( ( trb(ji,jj,ikt,jpoxy) - rtrn ) / o2ut, z1pdenit * ( 1.- nitrfac(ji,jj,ikt) ) )
	302	zdenitt = MIN( 0.5 * ( trb(ji,jj,ikt,jpno3) - rtrn ) / rdenit, z1pdenit * nitrfac(ji,jj,ikt) )
	303	tra(ji,jj,ikt,jpdoc) = tra(ji,jj,ikt,jpdoc) + z1pdenit - zolimit - zdenitt
	304	tra(ji,jj,ikt,jppo4) = tra(ji,jj,ikt,jppo4) + zpdenit + zolimit + zdenitt
	305	tra(ji,jj,ikt,jpnh4) = tra(ji,jj,ikt,jpnh4) + zpdenit + zolimit + zdenitt
	306	tra(ji,jj,ikt,jpno3) = tra(ji,jj,ikt,jpno3) - rdenit * (zpdenit + zdenitt)
	307	tra(ji,jj,ikt,jpoxy) = tra(ji,jj,ikt,jpoxy) - zolimit * o2ut
	308	tra(ji,jj,ikt,jptal) = tra(ji,jj,ikt,jptal) + rno3 * (zolimit + (1.+rdenit) * (zpdenit + zdenitt) )
	309	tra(ji,jj,ikt,jpdic) = tra(ji,jj,ikt,jpdic) + zpdenit + zolimit + zdenitt
[6140]	310	sdenit(ji,jj) = rdenit * zpdenit * e3t_n(ji,jj,ikt)
[3443]	311	#endif
	312	END DO
	313	END DO
	314
	315	! Nitrogen fixation process
[4529]	316	! Small source iron from particulate inorganic iron
[3443]	317	!-----------------------------------
	318	DO jk = 1, jpkm1
	319	DO jj = 1, jpj
	320	DO ji = 1, jpi
[4529]	321	! ! Potential nitrogen fixation dependant on temperature and iron
[3443]	322	zlim = ( 1.- xnanono3(ji,jj,jk) - xnanonh4(ji,jj,jk) )
	323	IF( zlim <= 0.2 ) zlim = 0.01
	324	zfact = zlim * rfact2
[7041]	325
[3446]	326	ztrfer = biron(ji,jj,jk) / ( concfediaz + biron(ji,jj,jk) )
[5385]	327	ztrpo4 = trb (ji,jj,jk,jppo4) / ( concnnh4 + trb (ji,jj,jk,jppo4) )
	328	zlight = ( 1.- EXP( -etot_ndcy(ji,jj,jk) / diazolight ) )
	329	nitrpot(ji,jj,jk) = MAX( 0.e0, ( 0.6 * tgfunc(ji,jj,jk) - 2.15 ) * r1_rday ) &
[4529]	330	& * zfact * MIN( ztrfer, ztrpo4 ) * zlight
	331	zsoufer(ji,jj,jk) = zlight * 2E-11 / (2E-11 + biron(ji,jj,jk))
[3443]	332	END DO
	333	END DO
	334	END DO
[3496]	335
[3443]	336	! Nitrogen change due to nitrogen fixation
	337	! ----------------------------------------
	338	DO jk = 1, jpkm1
	339	DO jj = 1, jpj
	340	DO ji = 1, jpi
[5385]	341	zfact = nitrpot(ji,jj,jk) * nitrfix
	342	tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) + zfact
	343	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + rno3 * zfact
	344	tra(ji,jj,jk,jpoxy) = tra(ji,jj,jk,jpoxy) + o2nit * zfact
	345	tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) + concdnh4 / ( concdnh4 + trb(ji,jj,jk,jppo4) ) &
	346	& * 0.002 * trb(ji,jj,jk,jpdoc) * xstep
	347	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) + 0.002 * 4E-10 * zsoufer(ji,jj,jk) * xstep
[3443]	348	END DO
	349	END DO
	350	END DO
[4529]	351
[4996]	352	IF( lk_iomput ) THEN
[5385]	353	IF( knt == nrdttrc ) THEN
[4996]	354	zfact = 1.e+3 * rfact2r * rno3 ! conversion from molC/l/kt to molN/m3/s
[5385]	355	IF( iom_use("Nfix" ) ) CALL iom_put( "Nfix", nitrpot(:,:,:) * nitrfix * zfact * tmask(:,:,:) ) ! nitrogen fixation
[4996]	356	IF( iom_use("INTNFIX") ) THEN ! nitrogen fixation rate in ocean ( vertically integrated )
	357	zwork1(:,:) = 0.
	358	DO jk = 1, jpkm1
[6140]	359	zwork1(:,:) = zwork1(:,:) + nitrpot(:,:,jk) * nitrfix * zfact * e3t_n(:,:,jk) * tmask(:,:,jk)
[4996]	360	ENDDO
	361	CALL iom_put( "INTNFIX" , zwork1 )
[3751]	362	ENDIF
[3443]	363	ENDIF
	364	ENDIF
	365	!
	366	IF(ln_ctl) THEN ! print mean trends (USEd for debugging)
	367	WRITE(charout, fmt="('sed ')")
	368	CALL prt_ctl_trc_info(charout)
[5385]	369	CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm)
[3443]	370	ENDIF
	371	!
[5385]	372	CALL wrk_dealloc( jpi, jpj, zdenit2d, zwork1, zwork2, zwork3, zbureff )
[4521]	373	CALL wrk_dealloc( jpi, jpj, zwsbio3, zwsbio4, zwscal )
[5385]	374	CALL wrk_dealloc( jpi, jpj, jpk, zsoufer )
[3443]	375	!
	376	IF( nn_timing == 1 ) CALL timing_stop('p4z_sed')
	377	!
[3496]	378	9100 FORMAT(i8,3f10.5)
	379	!
[3443]	380	END SUBROUTINE p4z_sed
	381
[5385]	382
	383	INTEGER FUNCTION p4z_sed_alloc()
	384	!!----------------------------------------------------------------------
	385	!! * ROUTINE p4z_sed_alloc *
	386	!!----------------------------------------------------------------------
	387	ALLOCATE( nitrpot(jpi,jpj,jpk), sdenit(jpi,jpj), STAT=p4z_sed_alloc )
	388	!
	389	IF( p4z_sed_alloc /= 0 ) CALL ctl_warn('p4z_sed_alloc: failed to allocate arrays')
	390	!
	391	END FUNCTION p4z_sed_alloc
	392
	393
[3443]	394	#else
	395	!!======================================================================
	396	!! Dummy module : No PISCES bio-model
	397	!!======================================================================
	398	CONTAINS
	399	SUBROUTINE p4z_sed ! Empty routine
	400	END SUBROUTINE p4z_sed
	401	#endif
	402
	403	!!======================================================================
[5656]	404	END MODULE p4zsed

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