[MITgcm-support] Tendencies from monthly output in ECCO v4-r2

[Jan-Erik Tesdal]

Dear Gael,

Thank you very much for your response! If I follow the directions in https://github.com/gaelforget/ECCO_v4_r2/blob/master/eccov4.pdf <https://github.com/gaelforget/ECCO_v4_r2/blob/master/eccov4.pdf> will I end up with WSLTMASS in nctiles format (and saved as netcdf file)? If not is there a way to convert the model output into the same formats as it is presented on the ftp site (ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/nctiles_monthly/ <ftp://mit.ecco-group.org/ecco_for_las/version_4/release2/nctiles_monthly/>)?

Best,
Erik

> On Mar 21, 2017, at 3:21 PM, gael forget <gforget at mit.edu> wrote:
> 
> Hi Erik,
> 
> not sure but WSLTMASS could indeed be the culprit. You can generate these fields or, to be most consistent, output complete salt budgets by following directions in https://github.com/gaelforget/ECCO_v4_r2/blob/master/eccov4.pdf <https://github.com/gaelforget/ECCO_v4_r2/blob/master/eccov4.pdf> and editing https://github.com/gaelforget/ECCO_v4_r2/blob/master/input/data.diagnostics <https://github.com/gaelforget/ECCO_v4_r2/blob/master/input/data.diagnostics>. The “budg2d_*” diagnostic sets, which are commented out in the online data.diagnostics, should include all variables needed for salt budgets.
> 
> Cheers,
> Gael
> 
> 
> 
> On Mar 18, 2017, at 5:25 PM, Jan-Erik Tesdal <tesdal at ldeo.columbia.edu <mailto:tesdal at ldeo.columbia.edu>> wrote:
> 
>> Hi all,
>> 
>> I’m hoping that a member of this forum can help me with an issue regarding the ECCOv4-r2 output. I am curious as to whether I can get reasonable salinity tendencies from the ECCOv4 monthly outputs. I started comparing my calculated tendencies to the available tendencies that are on the ftp site (‘nctiles_tendencies/‘). Please see my calculations and figures here: https://github.com/jetesdal/ecco_analysis/blob/master/ecco_v4_slt_divergences.ipynb <https://github.com/jetesdal/ecco_analysis/blob/master/ecco_v4_slt_divergences.ipynb>
>> 
>> The tendencies that I derived from the monthly output (‘nctiles_monthly/‘) match pretty well with the budget output (‘nctiles_tendencies/‘). However, one major difference I can see is in the surface layer of the tendency fields due to advection. As far as I can tell the only thing that I am missing is the WSLTMASS term that is discussed in Chakraborty and Campin (http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf?view=co&revision=1.1 <http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf?view=co&revision=1.1>), but I am not sure where I can find this term.
>> 
>> Is WSLTMASS the missing piece to my calculations, or is there another reason for these differences? Any suggestions are greatly appreciated!
>> 
>> Thanks,
>> Erik
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