[ecco-support] Budgets in ECv4, release 3

[Martha Buckley]

Thanks!  Have you done any budgets for the upper-ocean? For vertically
integrated budgets the vertical convergences don't play a role.
Martha


On Thu, Nov 2, 2017 at 1:07 PM, Wang, Ou (329B) <Ou.Wang at jpl.nasa.gov>
wrote:

> Hi Martha,
>
> I closed the heat budget for the global ocean from top to bottom.
>
> Regards,
> Ou
>
> From: <ecco-support-bounces at mit.edu> on behalf of Martha Buckley <
> marthabuckley at gmail.com>
> Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu>
> Date: Thursday, November 2, 2017 at 10:04 AM
> To: "ECCO support list, wider membership" <ecco-support at mit.edu>
> Subject: Re: [ecco-support] Budgets in ECv4, release 3
>
> Hi Ou,
> Thanks for the reply.  Can you tell me more about the type of budget that
> you closed, e.g., the diagnostic (mass, heat, salt, etc) and the
> layer/geographical area.  The reason that I am asking is that a budget over
> a single grid cell may not need 64-bit precision, but when integrating over
> depth, etc, the errors may accumulate.  I am currently looking at budgets
> over the top 1000m for mass, heat, salt.
>
> A very long time ago, I did a budget calculation using MITgcm output that
> did not close due to 32-bit output, and I changed to 64-bit output and it
> closed (since then I have always used 64-bit output so I haven't verified
> that this is necessary).
>
> thanks,
> Martha
>
>
>
> On Thu, Nov 2, 2017 at 12:03 AM, Wang, Ou (329B) <Ou.Wang at jpl.nasa.gov>
> wrote:
>
>> Hi Martha,
>>
>> I have closed the heat budget for the global ocean using the nctiles
>> output available on ftp://ecco.jpl.nasa.gov/Version4/Release3/. The
>> ratio of STD(tendency-convergences-forcing)/STD(tendency) is ~1e-7.
>>
>> Although the netCDF files are all in 64-bit precision, some of the
>> original binary diagnostic outputs that were converted to the tiled netCDF
>> files are in 32-bit precision. So apparently it is not necessary for the
>> files to be in 64-bit precision to close budgets.
>>
>> Release 3 has geothermal flux. See Section 4.2.1 (page 10) of Chris
>> Piecuch’s note
>> <ftp://ecco.jpl.nasa.gov/Version4/Release3/doc/evaluating_budgets_in_eccov4r3.pdf> on
>> budget calculation.
>>
>> Regards,
>> Ou Wang
>>
>> From: <ecco-support-bounces at mit.edu> on behalf of Martha Buckley <
>> marthabuckley at gmail.com>
>> Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu>
>> Date: Tuesday, October 31, 2017 at 7:35 AM
>> To: "ECCO support list, wider membership" <ecco-support at mit.edu>
>> Subject: [ecco-support] Budgets in ECv4, release 3
>>
>> Hi all,
>> I am trying to close mass, heat, and salt budgets in ECCo v4 release 3.
>> I closed the budgets to machine precision ((tendancy - ocean convergences -
>> surfaceFluxes)/tendancy  ~ 1e-7)) for an older iteration.  However, I
>> unable to close the budgets to machine precision for the files on the
>> website for release3 (the budgets visually look fine though).
>>
>> I'm trying to figure out if I have a bug in my code or if something
>> changed with the new output.  A few questions:
>> (1) Are the files 64-bit precision, which is needed to close budgets?
>> This seems to be the case since ncdump says the files are "double".
>> (2) Did anything change between "r2/iter3" and release3 that might
>> explain this?
>> (3) Has anyone closed budgets for release3 using the nctiles output
>> available on the ECCO website?
>> thanks,
>> Martha
>>
>>
>>
>>
>> --
>> Martha W. Buckley
>> marthabuckley at gmail.com
>> http://sites.google.com/site/marthabuckley/home
>>
>> _______________________________________________
>> ecco-support mailing list
>> ecco-support at mit.edu
>> http://mailman.mit.edu/mailman/listinfo/ecco-support
>>
>>
>
>
> --
> Martha W. Buckley
> marthabuckley at gmail.com
> http://sites.google.com/site/marthabuckley/home
>
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>


-- 
Martha W. Buckley
marthabuckley at gmail.com
http://sites.google.com/site/marthabuckley/home
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