NPZD negative concentration for no3 and all bio variables

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shailee
Posts: 2
Joined: Thu Feb 15, 2018 2:44 pm
Location: Indus university

NPZD negative concentration for no3 and all bio variables

#1 Post by shailee » Mon Aug 06, 2018 10:49 am

hello,
i am new to roms,and i want to run coupled bio-physical model with simple NPZD module. i had tried climatological run using available data with roms as per given in user guide. I got a negative concentration of no3 (nitrate) value after few days of simultaions and its still growing with model simulating time-steps.
Can some-body find out what could be the possible reason for getting these negative concentration of nitare?

with this i'm waiting for technical solution for my case study.


With warm regards
shailee
reserch scholar

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kate
Posts: 3718
Joined: Wed Jul 02, 2003 5:29 pm
Location: IMS/UAF, USA

Re: NPZD negative concentration for no3 and all bio variable

#2 Post by kate » Mon Aug 06, 2018 3:23 pm

Many advection schemes can give you the negative values. I limit NPZ tracers to be non-negative. Salt too.

shailee
Posts: 2
Joined: Thu Feb 15, 2018 2:44 pm
Location: Indus university

Re: NPZD negative concentration for no3 and all bio variable

#3 Post by shailee » Wed Aug 08, 2018 8:18 am

Thanks kate,
As per previous discussion in forum TS_MPDATA can solve negative value problem but in roms agrif version 3.1.1 i could not find this type of scheme.also i triedQuasi -monotone lateral advection scheme (WENO5 ) still its negative.i'll try to limit trcers. Is there any problem in bio_nchlpzd.f ??
Any suggestions are really means a lot to me

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