[MITgcm-devel] KPP diagnostics

[Jean-Michel Campin]

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