[MITgcm-devel] Paluszkiewicz plume model parameterization

[Martin Losch]

Hi Dimitris,

I implemented that scheme. The package is called OPPS and in  
verification/vermix you'll find an example how to use it in a very  
simple (2D) configuration.

HOWEVER:
1. I just plugged in the "original" routine, that Ralph (the  
Timmermann from the paper that Chris attached) gave to me. He got is  
from Paluszkiewicz, but I couldn't reach her, I guess she left  
science and is now in science administration? NFS? NOPP?
2. The routine is full of conditional goto's and jumps and is very  
difficult to read. I was on my list to clean that up, but I haven't  
got around to it
3. You cannot use OPPS together with any other mixing scheme, just as  
convective adjustment for which it is supposed to be a replacement.  
Maybe that should be changed.
4. Have a look at Ralph's paper: OPPS by itself is terrible because  
it doesn't do anything about wind stirring (just buoyancy driven  
convection)
5. It is one of my ongoing projects to systematically compare all  
mixing/convection schemes under controlled conditions  
(opps,kpp,my82,pp81,ggl90,implicit diffusion,convective adjustment,  
basically a follow up on Ralph's paper which suffers from the very  
specific application: They used a tuned model and the result is that  
the scheme that they used during tuning is the best, not very  
convincing. However, the main point seems to be more general: in ice- 
covered regions wind stirring is generally underestimated by the  
conventional schemes, including kpp I have to say, so that summer  
mixing layers are too shallow (top layer) and consequently surface  
temperatures are to high), that's why I implemented them almost 2  
years ago.

Martin


On Feb 10, 2006, at 6:33 AM, chris hill wrote:

> Not that I know of.
>
> Chris
>
> PS the attached paper has some interesting discussions on  
> convection in the southern ocean.
> Dimitris Menemenlis wrote:
>> Has anyone implemented Paluszkiewicz plume model parameterization  
>> in MITgcm.  It is supposed to have big positive impact on  
>> unrealistic winter time open-water convection that we see around  
>> Antarctica in hi-res model simulations.  Dimitris
>
> <timmerman_beckman.pdf>
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