[MITgcm-support] Passive tracer diagnostics

[Yuan Lian]

Hi, Jean-Michel,

Thank for the explanation. I did check the manual but it doesn't say the outputs 
are time averaged. Doesn't the time average interval need to be explicitly defined?
In data.diagnostics, each set of diagnostics has its own time average frequency, 
such as momentum and heat fluxes. That is, the averageFreq is a 1D array. For 
passive tracers, I noticed I could only specify the time average interval for tracers 
themself and surface tracer flux (PTRACERS_tavefreq). Am I missing something here?

Thanks!

Best,
Yuan

On Jul 29, 2011, at 6:18 AM, Jean-Michel Campin <jmc at ocean.mit.edu> wrote:

> Hi Yuan,
> 
> In data.diagnostics, If you set 
> a positive frequency, you get time averaged output.
> a negative frequency will give you snap-shot.
> 
> Did you check what is written in the documentation, section 7.1 ?
> I have the impression that this is not clearly explained in the manual.
> 
> And ane way to estimate transient eddies transport is 
> UTRAC - UVELMASS*[TRAC]
> with [TRAC] = ( TRAC(i-1)+TRAC(i) )/2 
> 
> Cheers,
> Jean-Michel
> 
> On Fri, Jul 29, 2011 at 01:32:31AM -0700, Yuan Lian wrote:
>> Hi,
>> 
>> I am trying to diagnose the eddy transport of passive tracers,
>> especially the tracer transport by
>> transient eddies. I noticed ptracers package has the output for the
>> zonal and meridional fluxes
>> of tracers (UTRAC and VTRAC for instance). Are they snapshot or time
>> averaged outputs? If I want
>> the time averaged UTRAC and VTRAC, how do I set the time average frequency?
>> 
>> Thanks much for your help!
>> 
>> Best,
>> Yuan
>> 
>> 
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