[MITgcm-support] [EXTERNAL] Banding, Checkerboarding in KPP Viscosities

[Jody Klymak]

> On Apr 2, 2020, at  14:24 PM, Dimitris Menemenlis <DMenemenlis at gmail.com> wrote:
> 
> Hi Ed, I was not questioning the need for a convective adjustment scheme but whether a simpler scheme than KPP, e.g., cAdjFreq/ivdc_kappa might suffice.


I would expect KL10 (Thorpe-scale scheme) would work well at this resolution as well, though it will only get shear-driven mixing if the model manages to resolve shear-driven KH billows, which may be difficult with the coarse horizontal resolution.  

Cheers,   Jody



> Senja, do they instabilities occur within or below KPPhbl?  Are they stable in time and vertical structure or do they oscillate?
> 
> 
>> On Apr 2, 2020, at 2:10 PM, Edward Doddridge <edward.doddridge at utas.edu.au <mailto:edward.doddridge at utas.edu.au>> wrote:
>> 
>> I would have guessed that KPP is still required. With an aspect ratio of 1:200 this simulation should still be in the hydrostatic regime, despite the high resolution.
>>  
>> If you have the computational resources you could try reducing dx and running a non-hydrostatic simulation without KPP.
>>  
>> Cheers,
>> Ed
> 
> 
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