[MITgcm-devel] KPP diagnostics

[Menemenlis, Dimitris (3248)]

Good idea!

Only suggestion/request is whether you
could add discussion below to
MITgcm/doc/diags_changes.txt

On Mar 31, 2010, at 2:55 PM, Jean-Michel Campin wrote:

> Hi,
> 
> I am going to add 2 diagnostics to KPP pkg for
> the non-local flux of temp. and salt that KPP produces
> (i.e., from KPP_TRANSPORT_XX ).
> 
> I was also tempted to replace the KPPghat diagnostics
> with something more useful which incorporates the KPPdiffKz:
> Since it is the product KPPghat*KPPdiffKz which matters, 
> and given that short time variation of both (which have no
> reason not to be correlated) can be significant,
> the product of the 2 time-ave is very likely to be quiet
> far from the time-ave of the product.
> It has also the advantage of a simpler interpretation:
> the product is just the fraction of the surface flux which is 
> treated as non local (no unit, instead of this funny s/m^2 
> for KPPghat).
> 
> Then I would propose to just pick one KPPdiffKz (for instance, 
> KPPdiffKzS for salinity, since it's also used for Ptracers), 
> and have only 1 diag: "KPPghatS" for KPPghat*KPPdiffKzS (no unit).
> 
> For temperature (KPPghat*KPPdiffKzT), it's probably not too different 
> from the one computed for salinity (might be in fact a better
> time-ave value that what we have now, for the reason above).
> And to get a precise diagnostic of KPP-non-local effect 
> on temperature, there would be this new diagnostic directly from 
> kpp_transport_t.F (which can be used to close a Temp. budget).
> 
> Suggestions/Critics ?
> 
> Cheers,
> Jean-Michel
> 
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