[gradsusr] ensemble reforecast runs

[Daniele Mastrangelo]

Hi Wesley,

thanks for your reply.

My previous email was not totally clear. Actually, I have 21 ensemble members 
with the same forecast length; these members are produced initializing the model 
at the same hour, day, and month (but) of 21 different years (12 UTC 29 aug 
1989, 12 UTC 29 aug 1990, ... , 12 UTC 29 aug 2009).

I tried, however, to apply something similar to your point 2): I aggregated 2 
members (e1, e2) in a single ctl file and changed by hand the year of the second 
member in the EDEF section, making it the same as the first member   

...
tdef 67 linear 12Z29aug1989 12hr
zdef 1 linear 1 1
vars 8
...
ENDVARS
EDEF 2
e1 67 12Z29aug1989
e2 67 12Z29aug1989  ---1989 instead of 1990---
ENDEDEF

Gribmap ran with no error messages but then, in GrADS, I could not use the e2 
fields: "Cannot contour grid - all undefined values"

Is there some other way I could try?

Best regards,
Daniele




________________________________
Da: Wesley Ebisuzaki <Wesley.Ebisuzaki at noaa.gov>
A: GrADS Users Forum <gradsusr at gradsusr.org>
Inviato: Lun 23 agosto 2010, 16:43:08
Oggetto: Re: [gradsusr] ensemble reforecast runs

Daniele,

   g2ctl assumes that the length of the forecast is the same for all 
ensemble members.
If not, you can do either

(1) You could try using the longest ensemble as the 1st ensemble.
      (It may work.)

(2) You have to set the TDEF by hand.

            Wesley Ebisuzaki


Daniele Mastrangelo wrote:
> Dear GrADS users,
>
> I'd like to use GrADS v 2.0.a8 to evaluate a set of 21 reforecast 
> ensemble runs. These runs are obtained running the same global model 
> initialized at the same hour and date of 21 different years.
>
> I obtained a single ctl file through "g2ctl.pl -ens" (g2ctl.pl v 
> 0.0.4o) but, when I used gribmap to produce the corresponding idx 
> file, I got the following error message:
>
> Open Error:  ensemble 1 (e2) extends beyond the time axis limits
>   The data file was not opened.
>
> I see that the problem is that these runs cover different periods; 
> moreover, I get the same error when I try to open two of the 21 
> different reforecast runs in a normal GrADS session (as file 1 and 
> file 2). Therefore, my question is: can GrADS treat a set reforecast 
> runs used as ensemble runs?
> If it cannot directly do that, is there a way to bypass the problem?
>
> Thank you,
> Daniele
>
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>
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