Oxygen in Fasham model

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LauraB
Posts: 23
Joined: Mon Jul 30, 2007 9:13 pm
Location: Dalhousie University
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Oxygen in Fasham model

#1 Unread post by LauraB »

Hi all,

I'm running ROMS 3.0 with Fasham biology, including carbon and oxygen. I have a question about one of the O2 fluxes:

The flux between zooplankton and ammonium (Z excretion + basal metabolism) produces oxygen... Why is that? I was thinking that maybe these processes could be accompanied by a sink of oxygen (representing Z respiration, which is not explicitly modeled). I'd really appreciate it if someone could explain what this source of O2 represents. Moreover, if this source is OK (and not a sign typo), should a oxygen sink from Z be included?

Thanks a lot in advance!
Laura

PS: The piece of code I'm talking about is:

Code: Select all

!
!  Zooplankton mortality and excretion.
!
              N_Flux_Zmortal=cff2*Bio(i,k,iZoop)
              N_Flux_Zexcret=cff3*Bio(i,k,iZoop)
              Bio(i,k,iNH4_)=Bio(i,k,iNH4_)+N_Flux_Zexcret
              Bio(i,k,iSDeN)=Bio(i,k,iSDeN)+N_Flux_Zmortal
!
!  Zooplankton basal metabolism (limited by a zooplankton minimum).
!
              N_Flux_Zmetabo=cff1*MAX(Bio(i,k,iZoop)-ZooMin(ng),0.0_r8)
              Bio(i,k,iZoop)=Bio(i,k,iZoop)-N_Flux_Zmetabo
              Bio(i,k,iNH4_)=Bio(i,k,iNH4_)+N_Flux_Zmetabo
#ifdef OXYGEN
              Bio(i,k,iOxyg)=Bio(i,k,iOxyg)+                            &
     &                       rOxNH4*(N_Flux_Zmetabo+N_Flux_Zexcret)
#endif

kfennel
Posts: 38
Joined: Thu Jun 12, 2003 6:55 pm
Location: Dalhousie University
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#2 Unread post by kfennel »

It's a typo. You should change the sign to minus to make this process an oxygen sink.

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