[MITgcm-support] linear growth of runoff

[Jean-Michel Campin]

Hi Dimitri,

Trying to help:

If this is the same set-up as the one you were writing on
earlier on this list, subject: "river discharge",
it cannot be any instability: the monitor is telling that
the net global E-P-R is negative and grows linearly, and the SSH
responds accordingly (again, I send a figure which clearly
show this).

If you want something else, you will need to change the forcing
and forcing parameters (data.exf & data.exf_clim or if you 
are not using pkg/exf, directly in "data").

If you are using pkg/obcs (open-boundary condition), it's an other
story, and the net inflow/outflow will add a contribution to the SSH.

Jean-Michel

On Mon, Mar 12, 2007 at 06:47:58PM -0700, Dmitri Leonov wrote:
> Hello Patrick,
> 
> Please let me know what exactly it was that you found wrong in my input 
> files. I've tried setting the runoffperiod to zero as you suggested but 
> the runoff still seems to be growing linearly - so the problem is not in 
> the time-interpolation but somewhere else. This is not architecture or 
> compiler specific as I originally thought it might be: just got same 
> results on a linux pc using g77.
> 
> Maybe I'm not allowed to have closed boundaries when I have a non-zero 
> E-P-R, so it's not a good test? What do you mean by balancing E-P-R 
> fields? In the actual experiment I have an open boundary.
> 
> If there is in fact some kind of bug there I thought some people other 
> than myself might be interested in looking into it. Otherwise I'll need 
> to find out what exactly was wrong with my set-up.
> 
> Regards,
> Dmitri.
> 
> 
> >No, you got that wrong.
> >Time interpolation of runoff is working properly,
> >assuming you've set values in data.exf correctly.
> >
> >>2) it gets interpolation period wrong so the slope depends on the 
> >>timestep (as if the period is specified in timesteps rather than in 
> >>seconds).
> >
> >Are your E-P-R fields balanced overall?
> >
> >-Patrick
> >
> >
> >>Jean-Michel Campin wrote:
> >>>Hi Dimitri,
> >>>
> >>>I forgot the important thing,
> >>>apparently, in your set-up, EXF produces a linear increase with time 
> >>>in run-off, but I don't know precisely what would need to be changed 
> >>>in data.exf & data.exf_clim to get a constant run-off. May be 
> >>>someone else will know.
> >>>
> >>>Jean-Michel
> >>>
> 
> -- 
> 
> ------------------------------------------------
> Dmitri A. Leonov
> Research Associate, Postdoctoral
> University of Washington, School of Oceanography
> 
> 
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