[MITgcm-support] NaNs in dic

[David Munday]

Hi Manfredi,

What sort of condition are you using for atmospheric pCO2? I use an interactive pCO2 concentration (dic_int1=3), and I've seen this sort of thing happen at start-up due to very large outgassing into the atmospheric box. I never really found a fix more elegant than increasing the box's initial pCO2 so less outgassing occurs. I imagine that this could still happen with other dic_int1 options, such as fixed pCO2, if the air-sea gas disequilibrium was particularly high.

Best wishes,

Dave

On 28 Jun 2011, at 03:43, Manfredi Manizza wrote:

> 
> Hi
> 
> I am having troubles with restarting some runs after downloading and compiling the new code last week.
> 
> I  have NaNs corresponding to the variable "dic" in the DIC biogeochemical package,
> after a few time steps .....all the other bgc tracers are fine.
> 
> I am assuming that if the PO4 have realistic values
> the biological uptake is fine and the problem might be linked to
> the CaCO3 processes, although alkalinity is fine too which is suspicious.
> 
> I am using the OCMIP old routine for CAR_S.
> 
> Any help/suggestion is welcome.
> 
> Manfredi
> 
> 
> 
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Dr. David R. Munday
University of Oxford
Atmospheric, Oceanic, and Planetary Physics
Clarendon Laboratory
Parks Road
Oxford
OX1 3PU
U.K.                 01865 284 329

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"But I, being poor, have only my dreams;
I have spread my dreams under your feet;
Tread softly because you tread on my dreams."
     - W.B. Yeats, He Wishes for the Cloths of Heaven -

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