[ecco-support] [EXTERNAL] Request for a specific configuration of ECCOv4

[Paola Cessi]

I think what Dan is saying is that if you want to isolate the effect of winds form that of purely buoyancy flux, the bulk formulas for heat and salt exchange depend on the wind stress as well, and it is difficult then of separating the two effects. At least, this is my interprestation, and it is a good point.

Paola

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Paola Cessi   
Scripps Institution of Oceanography  
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Paola Cessi
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> On Apr 3, 2020, at 9:19 AM, Matthew Mazloff <mmazloff at ucsd.edu> wrote:
> 
> Hi Dan
> 
> Can you please explain the double counting issue. I don’t understand what you are referring to. I don’t understand where it arises from for either optimization or reconstruction. 
> 
> Thanks
> Matt
> 
> 
> 
>> On Apr 3, 2020, at 6:53 AM, Dan Jones <dcjones.work at gmail.com <mailto:dcjones.work at gmail.com>> wrote:
>> 
>> Hi Dimitris,
>> 
>> Although I could be wrong, I do not think that the potential double counting issue matters much for the adjoint optimization process. As long as the control adjustments reduce the cost function, then I suppose that the optimization process will still work. Do you agree?
>> 
>> However, if we are attempting to reconstruct an objective function using adjoint sensitivities and anomalies (e.g. Helen Pillar's work on RAPID time series reconstructions, see her 2016 J. Climate paper), then the potential double-counting could be an issue. I'm hoping that by avoiding the bulk formulae I can more cleanly separate the effects of wind stress anomalies from those of heat flux anomalies. 
>> 
>> Best,
>> Dan
>> 
>> --------------------------------------------------------------
>> Dr Dan Jones / British Antarctic Survey
>> danjonesocean.com <http://www.danjonesocean.com/> / @DanJonesOcean
>> --------------------------------------------------------------
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