about nutrient concentration in river

[jschoi]

Hi dear.

I use fennel model in ROMS.
my question is nutrient concentration in river.
I don't entered concentrations of bio variable in river file.
so when running model, what's the value? zero? or default?

if default,
how to calculate this tile?

thanks for reading

[kate]

Some fields are assumed to be zero in the rivers, like zooplankton concentration. Some nutrients are in the rivers and people do study that. One such study is here.

[wilkin]

There are logical flags in bio_Fennel.in that activate/deactivate tracers in the river file.

Code: Select all

! Logical switches (TRUE/FALSE) to activate biological tracers point
! Sources/Sinks (like river runoff) and to specify which tracer variables
! to consider: [NBT,Ngrids] values are expected. See glossary below for
! details.

  LtracerSrc == 12*F

Any flags that are False will effectively cause zero concentration for that tracer. ROMS only reads from the river netcdf file the variables for which LtracerSrc is True. Check your logfile (stdout) to see which variables were read.

[kate]

Any flags that are False will effectively cause zero concentration for that tracer.

I don't think this is true. I think having the flag set to true and the concentration to zero is the correct thing to do. Having volume inflow without providing tracer concentrations is asking for trouble.

ROMS only reads from the river netcdf file the variables for which LtracerSrc is True. Check your logfile (stdout) to see which variables were read.

This is true.