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p4zsed.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/p4zsed.F90 @ 13233

Last change on this file since 13233 was 13233, checked in by aumont, 4 years ago
update of the PISCES comments
Property svn:keywords set to `Id`
File size: 29.6 KB

Rev	Line
[3443]	1	MODULE p4zsed
	2	!!======================================================================
	3	!! * MODULE p4sed *
[12537]	4	!! TOP : PISCES Compute loss of biogenic matter in the sediments
	5	!! Compute gain/loss of tracers from dust, rivers and
	6	!! sediments
	7	!! This module is used both by PISCES and PISCES-QUOTA
[3443]	8	!!======================================================================
	9	!! History : 1.0 ! 2004-03 (O. Aumont) Original code
	10	!! 2.0 ! 2007-12 (C. Ethe, G. Madec) F90
	11	!! 3.4 ! 2011-06 (C. Ethe) USE of fldread
	12	!! 3.5 ! 2012-07 (O. Aumont) improvment of river input of nutrients
[12537]	13	!!-----------------------------------------------------------------------
[3443]	14	!! p4z_sed : Compute loss of organic matter in the sediments
[12537]	15	!! : Compute gain/loss of tracers from dust, rivers and
	16	!! sediments
	17	!!-----------------------------------------------------------------------
[3443]	18	USE oce_trc ! shared variables between ocean and passive tracers
	19	USE trc ! passive tracers common variables
	20	USE sms_pisces ! PISCES Source Minus Sink variables
[10227]	21	USE p4zlim ! Co-limitations of differents nutrients
[3443]	22	USE p4zsbc ! External source of nutrients
	23	USE p4zint ! interpolation and computation of various fields
[10223]	24	USE sed ! Sediment module
[3443]	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
[13233]	37	LOGICAL, SAVE :: lk_sed !: Explicit sediment module
[3443]	38
	39	!!----------------------------------------------------------------------
[10067]	40	!! NEMO/TOP 4.0 , NEMO Consortium (2018)
[7753]	41	!! $Id$
[10068]	42	!! Software governed by the CeCILL license (see ./LICENSE)
[3443]	43	!!----------------------------------------------------------------------
	44	CONTAINS
	45
[5385]	46	SUBROUTINE p4z_sed( kt, knt )
[3443]	47	!!---------------------------------------------------------------------
	48	!! * ROUTINE p4z_sed *
	49	!!
[13233]	50	!! ** Purpose : Compute the loss of biogenic matter in the sediments. This
[12537]	51	!! is by no way a real sediment model. The loss is simply
	52	!! computed from metamodels.
	53	!! Loss/gain of tracers are also computed here for
	54	!! dust, rivers, sediments and hydrothermal vents (Fe)
	55	!! N2 fixation is modeled using an implicit approach
[3443]	56	!!
[13233]	57	!! ** Method : - Fluxes with the sediments are mainly modeled using
	58	!! statiscal metamodels.
[3443]	59	!!---------------------------------------------------------------------
	60	!
[5385]	61	INTEGER, INTENT(in) :: kt, knt ! ocean time step
[10127]	62	INTEGER :: ji, jj, jk, ikt
	63	REAL(wp) :: zrivalk, zrivsil, zrivno3
[10788]	64	REAL(wp) :: zwflux, zlim, zfact, zfactcal
[8533]	65	REAL(wp) :: zo2, zno3, zflx, zpdenit, z1pdenit, zolimit
[7646]	66	REAL(wp) :: zsiloss, zcaloss, zws3, zws4, zwsc, zdep
	67	REAL(wp) :: zwstpoc, zwstpon, zwstpop
	68	REAL(wp) :: ztrfer, ztrpo4s, ztrdp, zwdust, zmudia, ztemp
	69	REAL(wp) :: xdiano3, xdianh4
[3531]	70	!
[3443]	71	CHARACTER (len=25) :: charout
[10127]	72	REAL(wp), DIMENSION(jpi,jpj ) :: zdenit2d, zbureff, zwork
[10362]	73	REAL(wp), DIMENSION(jpi,jpj ) :: zwsbio3, zwsbio4
[9125]	74	REAL(wp), DIMENSION(jpi,jpj ) :: zsedcal, zsedsi, zsedc
	75	REAL(wp), DIMENSION(jpi,jpj,jpk) :: zsoufer, zlight
	76	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ztrpo4, ztrdop, zirondep, zpdep
[10416]	77	REAL(wp), ALLOCATABLE, DIMENSION(:,: ) :: zsidep, zironice
[3443]	78	!!---------------------------------------------------------------------
	79	!
[9124]	80	IF( ln_timing ) CALL timing_start('p4z_sed')
[3443]	81	!
[10223]	82	IF( kt == nittrc000 .AND. knt == 1 ) THEN
	83	r1_rday = 1. / rday
[13233]	84	! Configuration with an active two-way sediment module
[10223]	85	IF (ln_sediment .AND. ln_sed_2way) THEN
	86	lk_sed = .TRUE.
	87	ELSE
	88	lk_sed = .FALSE.
	89	ENDIF
	90	ENDIF
	91	!
[5385]	92	IF( kt == nittrc000 .AND. knt == 1 ) r1_rday = 1. / rday
[3443]	93	!
	94	! Allocate temporary workspace
[10362]	95	ALLOCATE( ztrpo4(jpi,jpj,jpk) )
	96	IF( ln_p5z ) ALLOCATE( ztrdop(jpi,jpj,jpk) )
[4521]	97
[7753]	98	zdenit2d(:,:) = 0.e0
	99	zbureff (:,:) = 0.e0
[10127]	100	zwork (:,:) = 0.e0
[7753]	101	zsedsi (:,:) = 0.e0
	102	zsedcal (:,:) = 0.e0
	103	zsedc (:,:) = 0.e0
[3443]	104
[12537]	105	! Iron input/uptake due to sea ice : Crude parameterization based on
	106	! Lancelot et al. Iron concentration in sea-ice is constant and set
	107	! in the namelist_pisces (icefeinput). ln_ironice is forced to false
	108	! when nn_ice_tr = 1
[3443]	109	! ----------------------------------------------------
	110	IF( ln_ironice ) THEN
	111	!
[9125]	112	ALLOCATE( zironice(jpi,jpj) )
[13233]	113
[12537]	114	! Compute the iron flux between sea ice and sea water
[13233]	115	! Simple parameterization assuming a fixed constant concentration in
	116	! sea-ice (icefeinput)
	117	! ------------------------------------------------------------------
[3443]	118	DO jj = 1, jpj
	119	DO ji = 1, jpi
[6140]	120	zdep = rfact2 / e3t_n(ji,jj,1)
[4148]	121	zwflux = fmmflx(ji,jj) / 1000._wp
[10788]	122	zironice(ji,jj) = MAX( -0.99 * trb(ji,jj,1,jpfer), -zwflux * icefeinput * zdep )
[3443]	123	END DO
	124	END DO
[12537]	125	! Update of the TRA array
[7753]	126	tra(:,:,1,jpfer) = tra(:,:,1,jpfer) + zironice(:,:)
[4996]	127	!
[5385]	128	IF( lk_iomput .AND. knt == nrdttrc .AND. iom_use( "Ironice" ) ) &
[6140]	129	& CALL iom_put( "Ironice", zironice(:,:) * 1.e+3 * rfact2r * e3t_n(:,:,1) * tmask(:,:,1) ) ! iron flux from ice
[4996]	130	!
[9125]	131	DEALLOCATE( zironice )
[3443]	132	!
	133	ENDIF
	134
	135	! Add the external input of nutrients from dust deposition
	136	! ----------------------------------------------------------
	137	IF( ln_dust ) THEN
	138	!
[9539]	139	ALLOCATE( zsidep(jpi,jpj), zpdep(jpi,jpj,jpk), zirondep(jpi,jpj,jpk) )
[13233]	140
[12537]	141	! Iron, P and Si deposition at the surface
	142	! Iron flux at the surface due to dust deposition. Solubility can be
	143	! be variable if ln_solub is set to true. In that case, solubility
	144	! has to be provided in the specific input file (read in p4zsbc)
[13233]	145	! mfrac is the mean iron relative weight content of dust
[12537]	146	! ------------------------------------------------------------------
[3443]	147	IF( ln_solub ) THEN
[7753]	148	zirondep(:,:,1) = solub(:,:) * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 55.85 + 3.e-10 * r1_ryyss
[3443]	149	ELSE
[7753]	150	zirondep(:,:,1) = dustsolub * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 55.85 + 3.e-10 * r1_ryyss
[3443]	151	ENDIF
[13233]	152
[12537]	153	! Si and P flux at the surface due to dust deposition. The content
	154	! and the solubility are hard coded
	155	! ----------------------------------------------------------------
[7753]	156	zsidep(:,:) = 8.8 * 0.075 * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 28.1
	157	zpdep (:,:,1) = 0.1 * 0.021 * dust(:,:) * mfrac * rfact2 / e3t_n(:,:,1) / 31. / po4r
[13233]	158
[12537]	159	! Iron solubilization of particles in the water column
	160	! dust in kg/m2/s ---> 1/55.85 to put in mol/Fe ; wdust in m/d
	161	! Dust are supposed to sink at wdust sinking speed. 3% of the iron
	162	! in dust is hypothesized to be soluble at a dissolution rate set to
	163	! 1/(250 days). The vertical distribution of iron in dust is computed
	164	! from a steady state assumption. Parameters are very uncertain and
	165	! are estimated from the literature quoted in Raiswell et al. (2011)
	166	! -------------------------------------------------------------------
	167	zwdust = 0.03 * rday / ( wdust * 55.85 ) / ( 250. * rday )
[3443]	168	DO jk = 2, jpkm1
[12537]	169	zirondep(:,:,jk) = dust(:,:) * mfrac * zwdust * rfact2 * EXP( -gdept_n(:,:,jk) / (250. * wdust) )
[13200]	170	zpdep (:,:,jk) = zirondep(:,:,jk) * 0.38 / po4r
[3443]	171	END DO
[13233]	172
[12537]	173	! Solubilization of particles in the water column (Si, P, Fe)
[7753]	174	tra(:,:,1,jpsil) = tra(:,:,1,jpsil) + zsidep (:,:)
[9539]	175	DO jk = 1, jpkm1
	176	tra(:,:,jk,jppo4) = tra(:,:,jk,jppo4) + zpdep (:,:,jk)
	177	tra(:,:,jk,jpfer) = tra(:,:,jk,jpfer) + zirondep(:,:,jk)
	178	ENDDO
[4996]	179	!
	180	IF( lk_iomput ) THEN
[5385]	181	IF( knt == nrdttrc ) THEN
[4996]	182	IF( iom_use( "Irondep" ) ) &
[6140]	183	& CALL iom_put( "Irondep", zirondep(:,:,1) * 1.e+3 * rfact2r * e3t_n(:,:,1) * tmask(:,:,1) ) ! surface downward dust depo of iron
[4996]	184	IF( iom_use( "pdust" ) ) &
[13200]	185	& CALL iom_put( "pdust" , dust(:,:) / ( wdust / rday ) * tmask(:,:,1) ) ! dust concentration at surface
[3443]	186	ENDIF
	187	ENDIF
[9539]	188	DEALLOCATE( zsidep, zpdep, zirondep )
[3443]	189	!
	190	ENDIF
	191
	192	! Add the external input of nutrients from river
[12537]	193	! ----------------------------------------------
[3443]	194	IF( ln_river ) THEN
[5385]	195	DO jj = 1, jpj
	196	DO ji = 1, jpi
	197	DO jk = 1, nk_rnf(ji,jj)
	198	tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) + rivdip(ji,jj) * rfact2
	199	tra(ji,jj,jk,jpno3) = tra(ji,jj,jk,jpno3) + rivdin(ji,jj) * rfact2
	200	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) + rivdic(ji,jj) * 5.e-5 * rfact2
	201	tra(ji,jj,jk,jpsil) = tra(ji,jj,jk,jpsil) + rivdsi(ji,jj) * rfact2
	202	tra(ji,jj,jk,jpdic) = tra(ji,jj,jk,jpdic) + rivdic(ji,jj) * rfact2
	203	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + ( rivalk(ji,jj) - rno3 * rivdin(ji,jj) ) * rfact2
[10362]	204	tra(ji,jj,jk,jpdoc) = tra(ji,jj,jk,jpdoc) + rivdoc(ji,jj) * rfact2
[5385]	205	ENDDO
	206	ENDDO
	207	ENDDO
[13233]	208
[12537]	209	! When prognostic ligands are activated, ligands are supplied
	210	! to the ocean by rivers. We assume that the amount of ligands
	211	! is equal to that of iron (iron is completely complexed)
	212	! ------------------------------------------------------------
[10362]	213	IF (ln_ligand) THEN
	214	DO jj = 1, jpj
	215	DO ji = 1, jpi
	216	DO jk = 1, nk_rnf(ji,jj)
	217	tra(ji,jj,jk,jplgw) = tra(ji,jj,jk,jplgw) + rivdic(ji,jj) * 5.e-5 * rfact2
	218	ENDDO
	219	ENDDO
	220	ENDDO
	221	ENDIF
[12537]	222	! PISCES-QUOTA part
[7646]	223	IF( ln_p5z ) THEN
	224	DO jj = 1, jpj
	225	DO ji = 1, jpi
	226	DO jk = 1, nk_rnf(ji,jj)
	227	tra(ji,jj,jk,jpdop) = tra(ji,jj,jk,jpdop) + rivdop(ji,jj) * rfact2
	228	tra(ji,jj,jk,jpdon) = tra(ji,jj,jk,jpdon) + rivdon(ji,jj) * rfact2
	229	ENDDO
	230	ENDDO
	231	ENDDO
	232	ENDIF
[3443]	233	ENDIF
	234
	235	! Add the external input of nutrients from nitrogen deposition
	236	! ----------------------------------------------------------
	237	IF( ln_ndepo ) THEN
[7753]	238	tra(:,:,1,jpno3) = tra(:,:,1,jpno3) + nitdep(:,:) * rfact2
	239	tra(:,:,1,jptal) = tra(:,:,1,jptal) - rno3 * nitdep(:,:) * rfact2
[3443]	240	ENDIF
	241
	242	! Add the external input of iron from hydrothermal vents
[12537]	243	! Please refer to Tagliabue et al. (2010) for more information
	244	! ------------------------------------------------------------
[3443]	245	IF( ln_hydrofe ) THEN
[7753]	246	tra(:,:,:,jpfer) = tra(:,:,:,jpfer) + hydrofe(:,:,:) * rfact2
[7646]	247	IF( ln_ligand ) THEN
[7753]	248	tra(:,:,:,jplgw) = tra(:,:,:,jplgw) + ( hydrofe(:,:,:) * lgw_rath ) * rfact2
[7646]	249	ENDIF
[3443]	250	!
[5385]	251	IF( lk_iomput .AND. knt == nrdttrc .AND. iom_use( "HYDR" ) ) &
[3446]	252	& CALL iom_put( "HYDR", hydrofe(:,:,:) * 1.e+3 * tmask(:,:,:) ) ! hydrothermal iron input
[3443]	253	ENDIF
	254
[12537]	255	! OA: Warning, the following part is necessary to avoid CFL problems
	256	! above the sediments. Vertical sinking speed is limited using the
	257	! typical CFL criterion
[4521]	258	! --------------------------------------------------------------------
	259	DO jj = 1, jpj
	260	DO ji = 1, jpi
	261	ikt = mbkt(ji,jj)
[6140]	262	zdep = e3t_n(ji,jj,ikt) / xstep
[4521]	263	zwsbio4(ji,jj) = MIN( 0.99 * zdep, wsbio4(ji,jj,ikt) )
	264	zwsbio3(ji,jj) = MIN( 0.99 * zdep, wsbio3(ji,jj,ikt) )
	265	END DO
	266	END DO
[7646]	267	!
[12537]	268	! No sediment module activated
[7646]	269	IF( .NOT.lk_sed ) THEN
[10223]	270	!
	271	! Add the external input of iron from sediment mobilization
	272	! ------------------------------------------------------
	273	IF( ln_ironsed ) THEN
[13233]	274	tra(:,:,:,jpfer) = tra(:,:,:,jpfer) + ironsed(:,:,:) * rfact2
[10223]	275	!
	276	IF( lk_iomput .AND. knt == nrdttrc .AND. iom_use( "Ironsed" ) ) &
	277	& CALL iom_put( "Ironsed", ironsed(:,:,:) * 1.e+3 * tmask(:,:,:) ) ! iron inputs from sediments
	278	ENDIF
	279
[12537]	280	! Computation of the sediment denitrification proportion: The metamodel
	281	! from Middleburg (2006) is used
	282	! Computation of the fraction of organic matter that is permanently
	283	! buried from Dunne's model (2007)
[7646]	284	! -------------------------------------------------------
	285	DO jj = 1, jpj
	286	DO ji = 1, jpi
	287	IF( tmask(ji,jj,1) == 1 ) THEN
	288	ikt = mbkt(ji,jj)
	289	zflx = ( trb(ji,jj,ikt,jpgoc) * zwsbio4(ji,jj) &
	290	& + trb(ji,jj,ikt,jppoc) * zwsbio3(ji,jj) ) * 1E3 * 1E6 / 1E4
	291	zflx = LOG10( MAX( 1E-3, zflx ) )
	292	zo2 = LOG10( MAX( 10. , trb(ji,jj,ikt,jpoxy) * 1E6 ) )
	293	zno3 = LOG10( MAX( 1. , trb(ji,jj,ikt,jpno3) * 1E6 * rno3 ) )
	294	zdep = LOG10( gdepw_n(ji,jj,ikt+1) )
	295	zdenit2d(ji,jj) = -2.2567 - 1.185 * zflx - 0.221 * zflx*2 - 0.3995 zno3 * zo2 + 1.25 * zno3 &
	296	& + 0.4721 * zo2 - 0.0996 * zdep + 0.4256 * zflx * zo2
	297	zdenit2d(ji,jj) = 10.0**( zdenit2d(ji,jj) )
	298	!
	299	zflx = ( trb(ji,jj,ikt,jpgoc) * zwsbio4(ji,jj) &
	300	& + trb(ji,jj,ikt,jppoc) * zwsbio3(ji,jj) ) * 1E6
	301	zbureff(ji,jj) = 0.013 + 0.53 * zflx2 / ( 7.0 + zflx )2
[10127]	302	ENDIF
[7646]	303	END DO
[10127]	304	END DO
[7646]	305	!
	306	ENDIF
[3443]	307
[12537]	308	! Fraction of dSi that is remineralized in the sediments. This is
	309	! set so that the burial in sediments equals the total input of Si
	310	! by rivers and dust (sedsilfrac)
	311	! ----------------------------------------------------------------
[10127]	312	IF( .NOT.lk_sed ) zrivsil = 1._wp - sedsilfrac
[3443]	313
[12537]	314	! Loss of bSi and CaCO3 to the sediments
[3443]	315	DO jj = 1, jpj
	316	DO ji = 1, jpi
	317	ikt = mbkt(ji,jj)
[6140]	318	zdep = xstep / e3t_n(ji,jj,ikt)
[10362]	319	zwsc = zwsbio4(ji,jj) * zdep
[5385]	320	zsiloss = trb(ji,jj,ikt,jpgsi) * zwsc
	321	zcaloss = trb(ji,jj,ikt,jpcal) * zwsc
[3443]	322	!
[5385]	323	tra(ji,jj,ikt,jpgsi) = tra(ji,jj,ikt,jpgsi) - zsiloss
	324	tra(ji,jj,ikt,jpcal) = tra(ji,jj,ikt,jpcal) - zcaloss
[3443]	325	END DO
	326	END DO
[7646]	327	!
	328	IF( .NOT.lk_sed ) THEN
[12537]	329	! Dissolution of CaCO3 and bSi in the sediments. This is
	330	! instantaneous since here sediments are not explicitly
	331	! modeled. The amount of CaCO3 that dissolves in the sediments
	332	! is computed using a metamodel constructed from Archer (1996)
	333	! ------------------------------------------------------------
[7646]	334	DO jj = 1, jpj
	335	DO ji = 1, jpi
	336	ikt = mbkt(ji,jj)
	337	zdep = xstep / e3t_n(ji,jj,ikt)
[10362]	338	zwsc = zwsbio4(ji,jj) * zdep
[7646]	339	zsiloss = trb(ji,jj,ikt,jpgsi) * zwsc
	340	zcaloss = trb(ji,jj,ikt,jpcal) * zwsc
	341	tra(ji,jj,ikt,jpsil) = tra(ji,jj,ikt,jpsil) + zsiloss * zrivsil
	342	!
	343	zfactcal = MIN( excess(ji,jj,ikt), 0.2 )
	344	zfactcal = MIN( 1., 1.3 * ( 0.2 - zfactcal ) / ( 0.4 - zfactcal ) )
[10127]	345	zrivalk = sedcalfrac * zfactcal
[7646]	346	tra(ji,jj,ikt,jptal) = tra(ji,jj,ikt,jptal) + zcaloss * zrivalk * 2.0
	347	tra(ji,jj,ikt,jpdic) = tra(ji,jj,ikt,jpdic) + zcaloss * zrivalk
[8533]	348	zsedcal(ji,jj) = (1.0 - zrivalk) * zcaloss * e3t_n(ji,jj,ikt)
	349	zsedsi (ji,jj) = (1.0 - zrivsil) * zsiloss * e3t_n(ji,jj,ikt)
[7646]	350	END DO
	351	END DO
	352	ENDIF
	353	!
[12537]	354	! Loss of particulate organic carbon and Fe to the sediments
[3443]	355	DO jj = 1, jpj
	356	DO ji = 1, jpi
[5385]	357	ikt = mbkt(ji,jj)
[6140]	358	zdep = xstep / e3t_n(ji,jj,ikt)
[4521]	359	zws4 = zwsbio4(ji,jj) * zdep
	360	zws3 = zwsbio3(ji,jj) * zdep
[5385]	361	tra(ji,jj,ikt,jpgoc) = tra(ji,jj,ikt,jpgoc) - trb(ji,jj,ikt,jpgoc) * zws4
	362	tra(ji,jj,ikt,jppoc) = tra(ji,jj,ikt,jppoc) - trb(ji,jj,ikt,jppoc) * zws3
	363	tra(ji,jj,ikt,jpbfe) = tra(ji,jj,ikt,jpbfe) - trb(ji,jj,ikt,jpbfe) * zws4
	364	tra(ji,jj,ikt,jpsfe) = tra(ji,jj,ikt,jpsfe) - trb(ji,jj,ikt,jpsfe) * zws3
[3443]	365	END DO
	366	END DO
[7646]	367	!
[12537]	368	! Loss of particulate organic N and P to the sediments (p5z)
[7646]	369	IF( ln_p5z ) THEN
	370	DO jj = 1, jpj
	371	DO ji = 1, jpi
	372	ikt = mbkt(ji,jj)
	373	zdep = xstep / e3t_n(ji,jj,ikt)
	374	zws4 = zwsbio4(ji,jj) * zdep
	375	zws3 = zwsbio3(ji,jj) * zdep
	376	tra(ji,jj,ikt,jpgon) = tra(ji,jj,ikt,jpgon) - trb(ji,jj,ikt,jpgon) * zws4
	377	tra(ji,jj,ikt,jppon) = tra(ji,jj,ikt,jppon) - trb(ji,jj,ikt,jppon) * zws3
	378	tra(ji,jj,ikt,jpgop) = tra(ji,jj,ikt,jpgop) - trb(ji,jj,ikt,jpgop) * zws4
	379	tra(ji,jj,ikt,jppop) = tra(ji,jj,ikt,jppop) - trb(ji,jj,ikt,jppop) * zws3
	380	END DO
	381	END DO
	382	ENDIF
[3443]	383
[7646]	384	IF( .NOT.lk_sed ) THEN
[12537]	385	! Degradation of organic matter in the sediments. The metamodel of
	386	! Middleburg (2006) is used here to mimic the diagenetic reactions.
[8533]	387	! The 0.5 factor in zpdenit is to avoid negative NO3 concentration after
	388	! denitrification in the sediments. Not very clever, but simpliest option.
[12537]	389	! ------------------------------------------------------------------------
[7646]	390	DO jj = 1, jpj
	391	DO ji = 1, jpi
	392	ikt = mbkt(ji,jj)
	393	zdep = xstep / e3t_n(ji,jj,ikt)
	394	zws4 = zwsbio4(ji,jj) * zdep
	395	zws3 = zwsbio3(ji,jj) * zdep
	396	zrivno3 = 1. - zbureff(ji,jj)
	397	zwstpoc = trb(ji,jj,ikt,jpgoc) * zws4 + trb(ji,jj,ikt,jppoc) * zws3
	398	zpdenit = MIN( 0.5 * ( trb(ji,jj,ikt,jpno3) - rtrn ) / rdenit, zdenit2d(ji,jj) * zwstpoc * zrivno3 )
	399	z1pdenit = zwstpoc * zrivno3 - zpdenit
	400	zolimit = MIN( ( trb(ji,jj,ikt,jpoxy) - rtrn ) / o2ut, z1pdenit * ( 1.- nitrfac(ji,jj,ikt) ) )
[8533]	401	tra(ji,jj,ikt,jpdoc) = tra(ji,jj,ikt,jpdoc) + z1pdenit - zolimit
	402	tra(ji,jj,ikt,jppo4) = tra(ji,jj,ikt,jppo4) + zpdenit + zolimit
	403	tra(ji,jj,ikt,jpnh4) = tra(ji,jj,ikt,jpnh4) + zpdenit + zolimit
	404	tra(ji,jj,ikt,jpno3) = tra(ji,jj,ikt,jpno3) - rdenit * zpdenit
[7646]	405	tra(ji,jj,ikt,jpoxy) = tra(ji,jj,ikt,jpoxy) - zolimit * o2ut
[8533]	406	tra(ji,jj,ikt,jptal) = tra(ji,jj,ikt,jptal) + rno3 * (zolimit + (1.+rdenit) * zpdenit )
	407	tra(ji,jj,ikt,jpdic) = tra(ji,jj,ikt,jpdic) + zpdenit + zolimit
[7646]	408	sdenit(ji,jj) = rdenit * zpdenit * e3t_n(ji,jj,ikt)
[8533]	409	zsedc(ji,jj) = (1. - zrivno3) * zwstpoc * e3t_n(ji,jj,ikt)
[7646]	410	IF( ln_p5z ) THEN
	411	zwstpop = trb(ji,jj,ikt,jpgop) * zws4 + trb(ji,jj,ikt,jppop) * zws3
	412	zwstpon = trb(ji,jj,ikt,jpgon) * zws4 + trb(ji,jj,ikt,jppon) * zws3
[8541]	413	tra(ji,jj,ikt,jpdon) = tra(ji,jj,ikt,jpdon) + ( z1pdenit - zolimit ) * zwstpon / (zwstpoc + rtrn)
	414	tra(ji,jj,ikt,jpdop) = tra(ji,jj,ikt,jpdop) + ( z1pdenit - zolimit ) * zwstpop / (zwstpoc + rtrn)
[7646]	415	ENDIF
	416	END DO
	417	END DO
	418	ENDIF
	419
	420
[12537]	421	! Nitrogen fixation process : light limitation of diazotrophy
	422	! Small source of iron from particulate inorganic iron (photochemistry)
	423	!----------------------------------------------------------------------
[3443]	424	DO jk = 1, jpkm1
[7753]	425	zlight (:,:,jk) = ( 1.- EXP( -etot_ndcy(:,:,jk) / diazolight ) ) * ( 1. - fr_i(:,:) )
	426	zsoufer(:,:,jk) = zlight(:,:,jk) * 2E-11 / ( 2E-11 + biron(:,:,jk) )
[7646]	427	ENDDO
[12537]	428
	429	! Diazotrophy (nitrogen fixation) is modeled according to an empirical
	430	! formulation. This is described in Aumont et al. (2015). Limitation
	431	! by P and Fe is computed. Inhibition by high N concentrations is imposed.
	432	! Diazotrophy sensitivity to temperature is parameterized as in
	433	! Ye et al. (2012)
	434	! ------------------------------------------------------------------------
[7646]	435	IF( ln_p4z ) THEN
[12537]	436	! PISCES part
[7646]	437	DO jk = 1, jpkm1
	438	DO jj = 1, jpj
	439	DO ji = 1, jpi
[12537]	440	! Potential nitrogen fixation dependant on temperature and iron
[10362]	441	ztemp = tsn(ji,jj,jk,jp_tem)
	442	zmudia = MAX( 0.,-0.001096ztemp2 + 0.057ztemp -0.637 ) * 7.625
	443	xdianh4 = trb(ji,jj,jk,jpnh4) / ( concnnh4 + trb(ji,jj,jk,jpnh4) )
	444	xdiano3 = trb(ji,jj,jk,jpno3) / ( concnno3 + trb(ji,jj,jk,jpno3) ) * (1. - xdianh4)
	445	zlim = ( 1.- xdiano3 - xdianh4 )
[13233]	446	! Nitrogen fixation is almost fully halted when the N
	447	! limitation term (xdiano3+xdianh4) is > 0.9
[10362]	448	IF( zlim <= 0.1 ) zlim = 0.01
[7646]	449	zfact = zlim * rfact2
[10362]	450	ztrfer = biron(ji,jj,jk) / ( concfediaz + biron(ji,jj,jk) )
	451	ztrpo4(ji,jj,jk) = trb(ji,jj,jk,jppo4) / ( 1E-6 + trb(ji,jj,jk,jppo4) )
	452	ztrdp = ztrpo4(ji,jj,jk)
	453	nitrpot(ji,jj,jk) = zmudia * r1_rday * zfact * MIN( ztrfer, ztrdp ) * zlight(ji,jj,jk)
[7646]	454	END DO
[3443]	455	END DO
	456	END DO
[7646]	457	ELSE ! p5z
[12537]	458	! PISCES-QUOTA part
[7646]	459	DO jk = 1, jpkm1
	460	DO jj = 1, jpj
	461	DO ji = 1, jpi
[12537]	462	! Potential nitrogen fixation dependant on temperature and iron
[7646]	463	ztemp = tsn(ji,jj,jk,jp_tem)
	464	zmudia = MAX( 0.,-0.001096ztemp2 + 0.057ztemp -0.637 ) * 7.625
	465	xdianh4 = trb(ji,jj,jk,jpnh4) / ( concnnh4 + trb(ji,jj,jk,jpnh4) )
	466	xdiano3 = trb(ji,jj,jk,jpno3) / ( concnno3 + trb(ji,jj,jk,jpno3) ) * (1. - xdianh4)
	467	zlim = ( 1.- xdiano3 - xdianh4 )
[13233]	468
	469	! Nitrogen fixation is almost fully halted when the N
	470	! limitation term (xdiano3+xdianh4) is > 0.9
[7646]	471	IF( zlim <= 0.1 ) zlim = 0.01
	472	zfact = zlim * rfact2
	473	ztrfer = biron(ji,jj,jk) / ( concfediaz + biron(ji,jj,jk) )
	474	ztrpo4(ji,jj,jk) = trb(ji,jj,jk,jppo4) / ( 1E-6 + trb(ji,jj,jk,jppo4) )
	475	ztrdop(ji,jj,jk) = trb(ji,jj,jk,jpdop) / ( 1E-6 + trb(ji,jj,jk,jpdop) ) * (1. - ztrpo4(ji,jj,jk))
	476	ztrdp = ztrpo4(ji,jj,jk) + ztrdop(ji,jj,jk)
	477	nitrpot(ji,jj,jk) = zmudia * r1_rday * zfact * MIN( ztrfer, ztrdp ) * zlight(ji,jj,jk)
	478	END DO
	479	END DO
	480	END DO
	481	ENDIF
[3496]	482
[12537]	483	! Update of the TRA arrays due to nitrogen fixation
	484	! -------------------------------------------------
[7646]	485	IF( ln_p4z ) THEN
[12537]	486	! PISCES part
[7646]	487	DO jk = 1, jpkm1
	488	DO jj = 1, jpj
	489	DO ji = 1, jpi
	490	zfact = nitrpot(ji,jj,jk) * nitrfix
[13233]	491	! 1/3 of the diazotrophs growth is supposed to be excreted
	492	! as NH4. 1/3 as DOC and the rest is routed POC and GOC as
	493	! a result of mortality by predation. Completely adhoc param
[10362]	494	tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) + zfact / 3.0
	495	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + rno3 * zfact / 3.0
	496	tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) - zfact * 2.0 / 3.0
	497	tra(ji,jj,jk,jpdoc) = tra(ji,jj,jk,jpdoc) + zfact * 1.0 / 3.0
	498	tra(ji,jj,jk,jppoc) = tra(ji,jj,jk,jppoc) + zfact * 1.0 / 3.0 * 2.0 / 3.0
	499	tra(ji,jj,jk,jpgoc) = tra(ji,jj,jk,jpgoc) + zfact * 1.0 / 3.0 * 1.0 / 3.0
	500	tra(ji,jj,jk,jpoxy) = tra(ji,jj,jk,jpoxy) + ( o2ut + o2nit ) * zfact * 2.0 / 3.0 + o2nit * zfact / 3.0
[13233]	501	! Fe/c of diazotrophs is assumed to be 30umol Fe/mol C
[10362]	502	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) - 30E-6 * zfact * 1.0 / 3.0
	503	tra(ji,jj,jk,jpsfe) = tra(ji,jj,jk,jpsfe) + 30E-6 * zfact * 1.0 / 3.0 * 2.0 / 3.0
	504	tra(ji,jj,jk,jpbfe) = tra(ji,jj,jk,jpbfe) + 30E-6 * zfact * 1.0 / 3.0 * 1.0 / 3.0
	505	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) + 0.002 * 4E-10 * zsoufer(ji,jj,jk) * rfact2 / rday
[7646]	506	END DO
	507	END DO
	508	END DO
	509	ELSE ! p5z
[12537]	510	! PISCES-QUOTA part
[7646]	511	DO jk = 1, jpkm1
	512	DO jj = 1, jpj
	513	DO ji = 1, jpi
	514	zfact = nitrpot(ji,jj,jk) * nitrfix
[13233]	515	! 1/3 of the diazotrophs growth is supposed to be excreted
	516	! as NH4. 1/3 as DOC and the rest is routed POC and GOC as
	517	! a result of mortality by predation. Completely adhoc param
[7646]	518	tra(ji,jj,jk,jpnh4) = tra(ji,jj,jk,jpnh4) + zfact / 3.0
	519	tra(ji,jj,jk,jptal) = tra(ji,jj,jk,jptal) + rno3 * zfact / 3.0
[13233]	520	! N/P ratio of diazotrophs is supposed to be 46
[7646]	521	tra(ji,jj,jk,jppo4) = tra(ji,jj,jk,jppo4) - 16.0 / 46.0 * zfact * ( 1.0 - 1.0 / 3.0 ) &
	522	& * ztrpo4(ji,jj,jk) / (ztrpo4(ji,jj,jk) + ztrdop(ji,jj,jk) + rtrn)
	523	tra(ji,jj,jk,jpdon) = tra(ji,jj,jk,jpdon) + zfact * 1.0 / 3.0
	524	tra(ji,jj,jk,jpdoc) = tra(ji,jj,jk,jpdoc) + zfact * 1.0 / 3.0
	525	tra(ji,jj,jk,jpdop) = tra(ji,jj,jk,jpdop) + 16.0 / 46.0 * zfact / 3.0 &
	526	& - 16.0 / 46.0 * zfact * ztrdop(ji,jj,jk) &
	527	& / (ztrpo4(ji,jj,jk) + ztrdop(ji,jj,jk) + rtrn)
	528	tra(ji,jj,jk,jppoc) = tra(ji,jj,jk,jppoc) + zfact * 1.0 / 3.0 * 2.0 / 3.0
	529	tra(ji,jj,jk,jppon) = tra(ji,jj,jk,jppon) + zfact * 1.0 / 3.0 * 2.0 /3.0
	530	tra(ji,jj,jk,jppop) = tra(ji,jj,jk,jppop) + 16.0 / 46.0 * zfact * 1.0 / 3.0 * 2.0 /3.0
	531	tra(ji,jj,jk,jpgoc) = tra(ji,jj,jk,jpgoc) + zfact * 1.0 / 3.0 * 1.0 / 3.0
	532	tra(ji,jj,jk,jpgon) = tra(ji,jj,jk,jpgon) + zfact * 1.0 / 3.0 * 1.0 /3.0
	533	tra(ji,jj,jk,jpgop) = tra(ji,jj,jk,jpgop) + 16.0 / 46.0 * zfact * 1.0 / 3.0 * 1.0 /3.0
	534	tra(ji,jj,jk,jpoxy) = tra(ji,jj,jk,jpoxy) + ( o2ut + o2nit ) * zfact * 2.0 / 3.0 + o2nit * zfact / 3.0
[13233]	535	! Fe/c of diazotrophs is assumed to be 30umol Fe/mol C
[7646]	536	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) - 30E-6 * zfact * 1.0 / 3.0
	537	tra(ji,jj,jk,jpsfe) = tra(ji,jj,jk,jpsfe) + 30E-6 * zfact * 1.0 / 3.0 * 2.0 / 3.0
	538	tra(ji,jj,jk,jpbfe) = tra(ji,jj,jk,jpbfe) + 30E-6 * zfact * 1.0 / 3.0 * 1.0 / 3.0
	539	tra(ji,jj,jk,jpfer) = tra(ji,jj,jk,jpfer) + 0.002 * 4E-10 * zsoufer(ji,jj,jk) * rfact2 / rday
	540	END DO
	541	END DO
	542	END DO
	543	!
	544	ENDIF
[4529]	545
[4996]	546	IF( lk_iomput ) THEN
[5385]	547	IF( knt == nrdttrc ) THEN
[8533]	548	zfact = 1.e+3 * rfact2r ! conversion from molC/l/kt to molN/m3/s
	549	IF( iom_use("Nfix" ) ) CALL iom_put( "Nfix", nitrpot(:,:,:) * nitrfix * rno3 * zfact * tmask(:,:,:) ) ! nitrogen fixation
[4996]	550	IF( iom_use("INTNFIX") ) THEN ! nitrogen fixation rate in ocean ( vertically integrated )
[10127]	551	zwork(:,:) = 0.
[4996]	552	DO jk = 1, jpkm1
[10127]	553	zwork(:,:) = zwork(:,:) + nitrpot(:,:,jk) * nitrfix * rno3 * zfact * e3t_n(:,:,jk) * tmask(:,:,jk)
[4996]	554	ENDDO
[10127]	555	CALL iom_put( "INTNFIX" , zwork )
[3751]	556	ENDIF
[12537]	557	IF( iom_use("SedCal" ) ) CALL iom_put( "SedCal", zsedcal(:,:) * zfact ) ! Permanent burial of CaCO3 in sediments
	558	IF( iom_use("SedSi" ) ) CALL iom_put( "SedSi", zsedsi (:,:) * zfact ) ! Permanent burial of bSi in sediments
	559	IF( iom_use("SedC" ) ) CALL iom_put( "SedC", zsedc (:,:) * zfact ) ! Permanent burial of OC in sediments
	560	IF( iom_use("Sdenit" ) ) CALL iom_put( "Sdenit", sdenit (:,:) * zfact * rno3 ) ! Denitrification in the sediments
[3443]	561	ENDIF
	562	ENDIF
	563	!
	564	IF(ln_ctl) THEN ! print mean trends (USEd for debugging)
	565	WRITE(charout, fmt="('sed ')")
	566	CALL prt_ctl_trc_info(charout)
[5385]	567	CALL prt_ctl_trc(tab4d=tra, mask=tmask, clinfo=ctrcnm)
[3443]	568	ENDIF
	569	!
[9125]	570	IF( ln_p5z ) DEALLOCATE( ztrpo4, ztrdop )
[3443]	571	!
[9124]	572	IF( ln_timing ) CALL timing_stop('p4z_sed')
[3443]	573	!
	574	END SUBROUTINE p4z_sed
	575
[5385]	576
	577	INTEGER FUNCTION p4z_sed_alloc()
	578	!!----------------------------------------------------------------------
	579	!! * ROUTINE p4z_sed_alloc *
	580	!!----------------------------------------------------------------------
	581	ALLOCATE( nitrpot(jpi,jpj,jpk), sdenit(jpi,jpj), STAT=p4z_sed_alloc )
	582	!
[10425]	583	IF( p4z_sed_alloc /= 0 ) CALL ctl_stop( 'STOP', 'p4z_sed_alloc: failed to allocate arrays' )
[5385]	584	!
	585	END FUNCTION p4z_sed_alloc
	586
[3443]	587	!!======================================================================
[5656]	588	END MODULE p4zsed

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