Total precipitation data

[Thiago Veloso]

  Dear all,  I wonder if it's a fair comparison. Davide, what's the grid spatial resolution of INTERIM data?  Supposing that it's 0.5x0.5º (~50x50km), you're trying to compare a pontual measurement with the estimate of a entire grid. Like and old teacher used to say: "A lot of things can occur in a grid with such dimensions"...  Maybe you should consider obtaining a finer resolution prec data. I think TRMM or CMORPH offer resolution of up to 8km. This might help you to find more concordant values...  Best wishes,  Thiago.

--- On Wed, 31/3/10, Joe Pietrowicz <pietrowicz at ZEDXINC.COM> wrote:

From: Joe Pietrowicz <pietrowicz at ZEDXINC.COM>
Subject: Re: Total precipitation data
To: GRADSUSR at LIST.CINECA.IT
Date: Wednesday, 31 March, 2010, 13:03

Davide is correct, because it is good practice to preform a quality control check to ensure that the
 finial reported value is correct. In addition it helps to have a secondary method to get a final total if it does not exist, as not every station reports a monthly total.

Joe Pietrowicz, Ph.D.
Senior Research Scientist

----- Original Message -----
From: "Tononi Davide" <Ext-Davide.Tononi at VTT.FI>
To: GRADSUSR at LIST.CINECA.IT
Sent: Wednesday, March 31, 2010 11:52:59 AM GMT -05:00 US/Canada Eastern
Subject: Re: Total precipitation data

The problems is that the metereologica data observed are only for month and for few cities.
So we need the data of INTERIM every 12 hours like the files that the problem is that the two data are not close each other.
Thank you
Davide
 

-----Original Message-----
From: GRADSUSR at LIST.CINECA.IT [mailto:GRADSUSR at LIST.CINECA.IT] On Behalf Of Todd MItchell
Sent: 31. maaliskuuta 2010 18:28
To: GRADSUSR at LIST.CINECA.IT
Subject: Re: Total precipitation data

HI David,

Good for you for comparing the INTERIM and observed data.  Since you have observed data, why don't you just use that?  What temporal and spatial resolution do you need the precipitation data for?

Todd Mitchell

Wednesday 31 March 2010

Tononi Davide wrote:
> Dear grads user.
>  
> I´m Davide Tononi and i'm doing some research about moisture on 
> structure. For that i need the precipitation data for some
 cities in 
> different part of Europe.
> For the data of precipitation i download from the web page: 
> _http://data-portal.ecmwf.int/data/d/interim_daily_ the data of total 
> precipitation.
> This data are every 12 hours so 2 times for day and is the sum of the
> 12 previous hours.
> I've tried to compare this data, downloaded with step 3, with the data 
> of metereological observation and the situation is like this:
>       city     Average temperature [ºC]     Average RH [%]     Annual 
> precipitation from INTERIM [mm]     Annual precipitation [mm] from 
> observation
> B     Florence     13.7     76     386     920
> C
     Helsinki     6.3     83     293     653
>
> Do you know how is possible this difference?
> I've tried also to download the data with step 6 and in this case for 
> the city of helsinki the situation change but now is bigger than in 
> the real situation.
>       city     Average temperature [ºC]     Average RH [%]     Annual 
> precipitation from INTERIM [mm]     Annual precipitation [mm] from 
> observation
> C     Helsinki     6.3     83     1380     653
>
> And if i sum al the precipitation for 10 years for different cities in 
> Europe the sum are very close each other for different cities.
>  
> So some of you can
 explain to me the meaning of the step? Some of you 
> have already use that data and can explain better how is the meaning 
> of this total precipitation?
>  
> Thank you so much
> Best regards
>  
> Davide Tononi
> VTT researcher
>  


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