[MITgcm-support] I love KPP

[Martin Losch]

Hi Dimitris,

I guess my water column was not so stably stratified after all (at 
least not the top 50 m), so  KPP did the right thing. I repeated my 
zero order experiment (no surface forcing) with a truly linear 
temperature (=density) profile and the mixing is minimal, 
hbl=3m=.5*dz(1) and everything seems ok. minKPPhbl=0. did not change 
anything (but made everthing much slower, strange ...), still hbl=3m.

So as usual, everything was my mistake (while looking at this one, I 
even found some more unrelated problems that I have now sorted out, so 
it was worth it). Hope, that you didn't spend too much time thinking 
about my homemade (just like grandma used to make them) problems. 
Thanks for your help,

Martin

On Friday, January 16, 2004, at 06:56  PM, Dimitris Menemenlis wrote:

> Hi Martin, the hacks you refer to are to make adjoint solution
> smoother.  I am surprised that they impact your problem since you said
> (I think) that your water column is stably stratified.  You must be
> really, really, weakly stratified?  What are your dz levels?  50m is a
> rather deep KPPhbl.  In my experience I found that it was rather
> difficult to get a 50-m KPPhbl in stratified waters.  You would need 
> the
> wind to really be howling for that.  So maybe there is some other
> problem with configuration?
>
> D.
>
> -- 
> Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
> Jet Propulsion Lab, California Insitute of Technology
> MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099
> tel: 818-354-1656;  fax: 818-393-6720