[ecco-support] [EXTERNAL] Stokes drift in ECCO2 product

[Matthew Mazloff]

Yes, we are currently evaluating the implementation of stokes velocity in the MITgcm. Rui Sun here at SIO is leading the work. 
As Dimitris says, it is not currently included in the ECCO products, though it is possible the adjusted wind stresses and mixing coefficients that ECCO uses to optimize the ocean solution do represent some of these physics. 

In direct response to your question, yes, it does make sense for you to add the Stokes velocity. This may give you a more accurate surface velocity. It will, however, break the momentum budget.  

Matt


> On Mar 13, 2021, at 8:49 AM, Dimitris Menemenlis <menemenlis at jpl.nasa.gov> wrote:
> 
> Dear Maxime, Stokes drift is definitely not included in the ECCO2 simulation that you refer to below nor, as far as I know, in any existing ECCO simulation.
> 
> A possible, very indirect way, in which Stokes drift is included, is that the corrections applied to ECCO solutions in order to fit available observations may wrap a little bit of the consequences of Stoke’s drift in other terms, for example, surface wind stress.
> 
> Scripps is working on including WW3 in regional ECCO solutions.  I cc Matt Mazloff, who may have more to say on this topic.
> 
> Best regards, Dimitris
> 
> 
>> On Mar 10, 2021, at 1:03 AM, Maxime Mouyen <maxime.mouyen at chalmers.se <mailto:maxime.mouyen at chalmers.se>> wrote:
>> 
>> Dear Ecco team,
>> 
>> Does it make sense to add Stokes drift velocities (wind-correlated drift of surface waters) to the ECCO2 surface velocity? Or does ECCO2 already account for such effects?
>> (I'm using these products: https://ecco.jpl.nasa.gov/drive/files/ECCO2/cube92_latlon_quart_90S90N/WVEL.nc <https://urldefense.com/v3/__https://ecco.jpl.nasa.gov/drive/files/ECCO2/cube92_latlon_quart_90S90N/WVEL.nc__;!!Mih3wA!X83lZoc2EIFKyEEzPLUBO7GuUrpm3cAagzbmETRPdvujiqOyrA0LnrDgG16MV5lwBw$>, VVEL.nc and UVEL.nc)
>> 
>> I read <https://urldefense.com/v3/__https://urldefense.us/v3/__https:/*agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JC014453__;!!PvBDto6Hs4WbVuu7!byy0rl83ps-3nyLI-Uaf_QuOrnkom49kBVrgqoU-Nd9cqYdA4qrYZ3mdTyhoLO61ZDyx$__;Lw!!Mih3wA!X83lZoc2EIFKyEEzPLUBO7GuUrpm3cAagzbmETRPdvujiqOyrA0LnrDgG15esjoTmA$> that the MITgcm used in ECCO2 "does not include representation of surface waves" but I cannot make clear if the ECCO2 products mentioned above are subsequently forced by winds.
>> 
>> Thanks for your help on this matter and for providing such useful products.
>> 
>> Best regards,
>> Maxime 
>> 
>> 
>> ----
>> Maxime Mouyen
>> Chalmers University of Technologyo
>> Tel: +46 31 772 5549
>> Onsala rymdobservatorium
>> Observatorievägen 90, 439 92 Onsala, Sweden.
>> ----
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