[MITgcm-devel] Paluszkiewicz plume model parameterization

[Martin Losch]

That's perfectly ok, in fact i am happy that noone really noticed,  
because I wanted to get this comparison study going first. But it's  
all there (ggl90 is the OPA-"TKE"-scheme).

Martin

On Feb 10, 2006, at 3:58 PM, chris hill wrote:

> oops - sorry I thought you'd only done pacanowski and philander stuff!
>
> Chris
> Martin Losch wrote:
>> 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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