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C $Header: /u/gcmpack/MITgcm_contrib/darwin2/pkg/quota/geider98.F,v 1.1 2011/04/13 18:56:25 jahn Exp $ |
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C $Name: $ |
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jahn |
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#include "CPP_OPTIONS.h" |
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#include "PTRACERS_OPTIONS.h" |
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#include "DARWIN_OPTIONS.h" |
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c |
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#ifdef ALLOW_PTRACERS |
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#ifdef ALLOW_DARWIN |
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#ifdef GEIDER |
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#ifdef DYNCHL |
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c |
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c ==================================================================== |
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c SUBROUTINE GEIDER98 |
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c ==================================================================== |
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SUBROUTINE GEIDER98( |
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I PARlocal, |
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I biomass, |
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I qlimit, |
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#ifdef FQUOTA |
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I felimit, |
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#endif |
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#ifdef QUOTA_DIAG_LIMIT |
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O Ilim, |
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#endif |
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I up_inorg, |
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O PP, |
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I photo_Tempfunction, |
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O dchldt, ! chlorophyll synthesis rate |
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I myThid) |
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IMPLICIT NONE |
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#ifdef ALLOW_QUOTA |
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#include "QUOTA_SIZE.h" |
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#include "QUOTA.h" |
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#else |
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#include "MONOD_SIZE.h" |
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#include "MONOD.h" |
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#endif |
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c |
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INTEGER myThid |
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INTEGER ii,jp |
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c |
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_RL PARlocal |
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_RL biomass(iomax,npmax) |
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_RL qlimit(npmax) |
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_RL felimit(npmax) |
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_RL alpha_fe |
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_RL up_inorg(iimax,npmax) |
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_RL N_uptake(npmax) |
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_RL photo_Tempfunction |
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c |
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_RL dchldt(npmax) |
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c |
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_RL E0 |
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_RL C_biomass |
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_RL chl |
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_RL VCref |
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c |
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_RL Chl2C |
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_RL PCmax |
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_RL PCPhot(npmax) |
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_RL rhochl |
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_RL chlsynth(npmax) |
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_RL VCmax |
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_RL VCN |
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_RL PP |
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#ifdef QUOTA_DIAG_LIMIT |
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_RL Ilim(npmax) |
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#endif |
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c |
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c Geider, MacIntyre and Kana (1998) photosynthesis model |
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c adapted for multiple nutrients following Moore et al (2002) |
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c |
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E0 = PARlocal ! muEin m^-2 s^-1 |
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PP = 0.0 _d 0 |
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do jp=1,npmax |
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#ifdef FQUOTA |
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alpha_fe = alphachl(jp) * felimit(jp) |
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#else |
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alpha_fe = alphachl(jp) |
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#endif |
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if (autotrophy(jp).gt.0. _d 0) then |
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C_biomass = biomass(iCarb,jp) ! mmol C m^-3 |
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chl = biomass(iChlo,jp) ! mg Chl m^-3 |
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c |
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c N uptake is sum of NO3, NO2 and NH4 uptake |
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VCN = 0.0 _d 0 |
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do ii=2,iimax |
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if (ii.eq.iNO3.or.ii.eq.iNO2.or.ii.eq.iNH4) then |
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VCN = VCN + up_inorg(ii,jp) ! mmol N (mmol C)^-1 s^-1 |
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endif |
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enddo |
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c |
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c----------------------------------------------------------------- |
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if (E0.gt.1. _d -1 .and. |
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& vmaxi(iDIC,jp).gt.0. _d 0 .and. |
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& C_biomass.gt.0. _d 0 .and. |
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& chl.gt.0. _d 0) then |
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Chl2C = chl / C_biomass ! mg chl (mmol C)^-1 |
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c |
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PCmax = vmaxi(iDIC,jp) ! s^-1 |
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& * qlimit(jp) |
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& * photo_Tempfunction |
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c |
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if (PCmax.gt.0. _d 0.and.alpha_fe.gt.0. _d 0) then |
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PCPhot(jp) = PCmax ! s^-1 |
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& *(1. _d 0-exp(-alpha_fe*Chl2C*E0/PCmax)) |
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c |
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#ifdef QUOTA_DIAG_LIMIT |
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Ilim(jp)=1. _d 0 |
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& -exp(-alphachl(jp)*Chl2C*E0/vmaxi(iDIC,jp)) |
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#endif |
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c |
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rhochl = Chl2Nmax * PCPhot(jp) ! mg chl (mmol N)^-1 |
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& /(alphachl(jp)*Chl2C*E0) |
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chlsynth(jp) = rhochl * VCN * C_biomass ! mg chl m^-3 s^-1 |
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else |
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PCPhot(jp) = 0. _d 0 ! s^-1 |
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chlsynth(jp) = 0. _d 0 ! mg chl m^-3 s^-1 |
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endif |
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c |
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else ! else if insufficient light, max phot=0 or C biomass=0... |
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PCPhot(jp) = 0. _d 0 ! s^-1 |
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chlsynth(jp) = 0. _d 0 ! mg chl m^-3 s^-1 |
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endif |
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c----------------------------------------------------------------- |
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! for passing back to quota_plankton |
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PP = PP + PCPhot(jp) * C_biomass |
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up_inorg(iDIC,jp) = PCPhot(jp) - biosynth*VCN ! s^-1 |
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dchldt(jp) = chlsynth(jp) ! mg chl m^-3 s^-1 |
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else ! else if jp is a heterotroph |
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up_inorg(iDIC,jp) = 0. _d 0 ! s^-1 |
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dchldt(jp) = 0. _d 0 ! mg chl m^-3 s^-1 |
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c----------------------------------------------------------------- |
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endif |
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enddo |
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RETURN |
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END |
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c |
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#endif /*DYNCHL*/ |
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#endif /*GEIDER*/ |
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#endif /*ALLOW_DARWIN*/ |
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#endif /*ALLOW_PTRACERS*/ |
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C ================================================================== |
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