[MITgcm-support] documentation for pkg/smooth

[gael forget]

Hi Dimitris,

> Dear MITgcmers,
> is any documentation for pkg/smooth available?
Unfortunately this is still missing from mitgcm documentation. 
I hope to take time to add to MITgcm documentation regarding 
this package (as well as ecco,ctrl, and profiles …) this spring.

> In particular, I am trying to understand how pkg/smooth parameters relate
> the (2 k_1 T)^0.5 length scale discussed in the Weaver and Courtier paper:
> http://mitgcm.org/~gforget/pdfs/weavercourtier01.pdf
The parameters as set in data.smooth follow WC01’s notations 
(if I recall correctly) specify the spatial correlation modeling 
for use with pkg/ctrl & autodiff. Is this what you are trying to do? 

> Or more precisely, what is the half-power bandwidth
> of a filter based on following parameters:
> &SMOOTH_NML
> smooth2Dnbt(1)=5000
> smooth2D_Lx0(1)=100000.
> smooth2D_Ly0(1)=100000.
> smooth2Dtype(1)=1
> smooth2Dsize(1)=0
> smooth2Dfilter(1)=0
In the case of the WC01 correlation modeling (if I recall correctly) 
it is only the squared root of the diffusion operator that is applied.

If the matter is simply to smooth out a field up to a specified scale, 
things are somewhat different. You want to use smooth_hetero2d.F 
or smooth_basic2D.F and will find examples in pkg/ecco.

I hope this helps,
Gael

> Does above define a lowpass filter for scales greater than 100 km,
> 200 km, 628 km, or some other value?
> 
> Thanks, Dimitris
> 
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