[MITgcm-support] get info Momentum/Vorticity Budget

[Martin Losch]

Hi Marco,

I am returning this to the support list. There is no guarantee that I (or any individual) can answer a specific question so it is better to have more listeners. I am sorry you haven’t got a satisfactory reply so far.

Here’s an email thread that ends with success (I found it by entering this: “totutend site:mitgcm.org/pipermail” in google.com, I don’t understand why “our” search function does not work properly, that’s an continous problem):

http://mitgcm.org/pipermail/mitgcm-support/2010-December/006921.html

Apparently, you need to include surface elevation gradient (d ETAN / d x).

Martin

On Nov 28, 2013, at 12:43 PM, Marco Reale <reale.marco82 at gmail.com> wrote:

> Dear dr. Losch,
> 
> My name is Marco and I’m ph.d Student in Environmental and Industrial Fluid Mechanics at University of Trieste.Presently I’m involved in a joint project between OGS and ICTP.I’m using the model MITGCM to study the upper layer variability of circulation of Ionian Sea. Now I’m computing  vorticity and momentum budget for the Ionian Sea using the diagnostics coming from the model.In the file data.diagnostics I set frequency(n)=432000  and I got the following diagnostics :  totutend, Um_Diss,Um_Advec,Um_Cori,Um_dPHdx,Um_Ext,VISrE_Um (I’m using explicit scheme).I didn’t consider the rigid lid in the computations. Similar diagnostics have been got for totvtend,Then I applied the formula for each time step dr Campin suggests in MITGCM mailing list
>  
> “TOTUTEND/86400=Um_Diss+Um_Advec+Um_Cori+Um_dPHdx+Um_Ext"
> 
> but it doesn’t work. The difference appears to be strong  (two or three orders of magnitude).
> 
> Then I applied the curl in the form MITGCM uses for computing relative vorticity to each previous term of momentum budget and compared the final result with Z3 coming from the model but also in this case the difference is strong(an overestimation of 20%)…
> 
> In the past I wrote to MITGCM list but I didn’t get any suggestion or advice.Could you provide some suggestions or advice?
> 
> Looking forward to a positive response to my reply
> 
> Best regards
> 
> Marco
> ***********************************
> Marco Reale
> ph.D student "Environmental and Industrial Fluid Mechanics"-XXVII cycle
> University of Trieste-Department of Mathematics and Informatics
> National Institute of Geophysics and Oceanography (OGS)
> International Center for Theorethical Physics (ICTP)
> Italian Geophysical Association
> Italian Meteorological Society
> web-page: http://phdfluidmechanics.appspot.com/stud.html?Reale
> skype: mcreal82
> phone number: +39 3270888069
> 
> ***********************************
>