[RegCNET] Re: Timing of RegCM SRF output

[Pal Jeremy]

Hi Bill,

I realized while shaving this morning that I gave you some incorrect 
information.  I stated to you (and the RegCNET) that the fluxes and 
radiation were instantaneous, when instead they are averaged.

Of the variables that you are interested in, the sensible and latent 
heat fluxes are average rates over the interval, while the surface air 
temperature and specific humidity are instantaneous values.  By average, 
I mean that if you have output designated at 03 UTC, it is the average 
between 00 UTC and 03 UTC.  By instantaneous, the output designated at 
03 UTC would simply be that quantity at that time.

Let me know if this clarifies.

Jeremy


William J. Gutowski wrote:

> The primary variables of interest are the sensible and latent heat 
> fluxes, surface air temp., and surface (air) specific humidity.  So if 
> I have output designated as being for 03 UTC, does that mean the file 
> has those quantities for that instant (that is, the time step ending 
> at 03 UTC)?
>
>     BTW - this is to extract some information of interest for the 
> transferability runs I've done with RegCM3.  There is some 
> inconsistency among the models participating so far about what gets 
> save, how often and whether or not it is a value averaged over some 
> time period.  There may be some discussion starting about what to 
> save.  If that does start, I'll get you in the loop on it.
>
> Thanks,
> Bill
>
>> Hi Bill,
>>
>> Your answer depends on the variable of interest.  For example, runoff 
>> and precipitation are average rates over the period and winds, 
>> temperatures, fluxes, and radiation are instantaneous.
>>
>> Is there any variable in particular that you are interested in?
>>
>> Jeremy
>>
>>
>> William J. Gutowski wrote:
>>
>>> Dear RegCNETers:
>>>
>>>     RegCM writes surface quantities (in the SRF files) every three 
>>> hours in its standard setup.  Can someone tell me what period is 
>>> represented at each write time?  That is, for the output nominally 
>>> at 03 UTC, is this representing the period 00-03 UTC, and are all 
>>> values averages over that period?
>>>
>>> Thanks,
>>> Bill Gutowski
>>
>>
>>
>> -- 
>> The Abdus Salam International Centre for Theoretical Physics
>> Strada Costiera 11; 34100 Trieste, ITALY
>> Phone: +39 040 2240579; Fax: +39 040 2240449
>
>
>

-- 
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera 11; 34100 Trieste, ITALY
Phone: +39 040 2240579; Fax: +39 040 2240449