Units of Precipitation,U,V wind etc. in ERA 40 datasets
sajjad saeed
sajjad_met at HOTMAIL.COM
Fri Nov 10 06:52:11 EST 2006
Dear Bernd Becker,
The units are not given on that page and on the related links. Can you tell
me what is the unit of precipitation in ERA 40 datasets. Is precipitation
expressed in mm/day or cm/day etc for the daily data? Likewise what are the
units of U and V components of wind, Is it expressed in m/see or cm/see etc.
Where from I can get such information
Thankyou for your early response
Sajjad
******************************************************************************
Sajjad Saeed
Meteorologist,
Pakistan Meteorological Department (PMD),
P.O.Box 1214, Sector H-8/2, Islamabad, Pakistan.
Research Fellow,
Global Change Impact Studies Centre (GCISC),
First Floor, Saudi Pak Tower, Blue Area, Islamabad, Pakistan.
Ph: +92-51-9219785, Fax: +92-51-9219787
Mob:+92-334-5419962
Email: sajjad_met at hotmail.com. sajjad2pk2 at yahoo.com
sajjad.saeed at gcisc.org.pk
>From: bernd.becker at METOFFICE.GOV.UK
>Reply-To: GRADSUSR at LIST.CINECA.IT
>To: GRADSUSR at LIST.CINECA.IT
>Subject: Re: Units of Precipitation,U,V wind etc. in ERA 40 datasets
>Date: Fri, 10 Nov 2006 11:34:29 +0000
>
>http://www.ecmwf.int/products/data/archive/descriptions/e4/index.html
>
>On Fri, 2006-11-10 at 16:29 +0500, sajjad saeed wrote:
> > Dear all,
> >
> > Can some one tell me what are the units of precipitation, u, v wind,
> > temperature etc in the reanalysis ERA 40 datasets of ECMWF. From where
>we
> > can find the units of different variables available in ERA 40 datasets.
> >
> > Thanyou in advance for your information.
> >
> >
> > Sajjad Saeed
> > ...........................................................
> > Meteorologist,
> > Pakistan Meteorological Department (PMD),
> > P.O.Box 1214, Sector H-8/2, Islamabad, Pakistan.
> >
> > Research Fellow
> > Global Change Impact Studies Centre (GCISC),
> > First Floor, Saudi Pak Tower, Blue Area, Islamabad, Pakistan.
> > Ph: +92-51-9219785, Fax: +92-51-9219787
> > Mob:+92-334-5419962
> > Email: sajjad_met at hotmail.com. sajjad2pk2 at yahoo.com
> > sajjad.saeed at gcisc.org.pk
> >
> >
> >
> >
> >
> > >From: Suvarna Fadnavis <suvarna at TROPMET.RES.IN>
> > >Reply-To: GRADSUSR at LIST.CINECA.IT
> > >To: GRADSUSR at LIST.CINECA.IT
> > >Subject: Re: contour plot for diff latitudinal belts
> > >Date: Wed, 28 Jun 2006 07:03:35 +1200
> > >
> > >Dear Dr. ARINDAM CHAKRABORTY,
> > > Thank you for your help in plotting contour in proper oredr( x,y, z
>and
> > >t).
> > > with best regards
> > > Suvarna
> > >On Fri, 23 Jun 2006 22:17:34 -0400, Arindam Chakraborty wrote
> > > > hi Suvarna,
> > > > when grads reads a data file, (by default) the different
> > > > dimensions are read in this order: x, y, z, variable, t;
> > > > Means x (longitude) varies fastest, and then y (latitude) and so on.
> > > > (Although there can be variations of this, see
> > > > http://grads.iges.org/grads/gadoc/descriptorfile.html#VARS for
> > > > 'non-standard binaries' for details. But for your control file the
> > > > standard rule applies).
> > > > Now, one of your control files has y and z, for which first
>8
> > > > data values in the file will be read as different latitudes at the
> > > > first level, and so on. For another control file, which has z and t,
> > > > the first 12 data values will be taken as different levels at the
> > > > first latitude (alias time here), and so on for the rest of
> > > > the data. This is the reason you get different results for those two
> > > > control files.
> > > > How to write the control file is dependent on how you've
> > > > written down the data file. It is always a good idea to write the
>data
> > > > in the default order of grads if you plan to use it in grads later
>on.
> > > > In your case, you need to write y as the faster varying dimension
> > > > than z in your output data file. Then use the control file which has
>y
> > > > and z.
> > > > Please also set the lat levels as 35, 25, ..., 5, -5, ...,
>35
> > > > (the centers of the bands of average), that's a better way of
> > > > representation.
> > > >
> > > > ----------------------------
> > > > ARINDAM CHAKRABORTY
> > > > Department of Meteorology
> > > > Florida State University
> > > > Tallahassee, FL-32306, USA
> > > > Tel: +001-850-6443524 (Off)
> > > > +001-850-5758550 (Res)
> > > > Fax: +001-850-6449642
> > > > ____________________________
> > > >
> > > > On Sat, 24 Jun 2006, Suvarna Fadnavis wrote:
> > > >
> > > > > Dear Dr. Chakraborty,
> > > > > I am trying to plot (Contor) QBO values obtaied at 8
> > >latitudinal belts
> > >(40-
> > > > > 30, 30-20, 20-10, 0-10 10-0 10-20, 20-30, 30-40). I want to plot
>QBO
> > >values by
> > >taking
> > > > > x axis as latitude and y axais as pressure levels. I tried to plot
>it
> > >by taking
> > > > > (1) x-axis as time (t=8) and y -axis as pressure
> > > > > (2) x-axis as latitude and y -axis as pressure by defining ydef 8
> > >levels -40 -30 -
> > >20 -
> > > > > 10 10 20 30 40
> > > > > I should get the same structure but I get two
>different
> > >structure.
> > >Please
> > > > > guide me which is correct and what is the reason for difference. I
>am
> > >attaching ctl
> > >and
> > > > > gs and data file for your kinf perusal.
> > > > > suvarna
> > >
> > >
> > >With best regards
> > > Suvarna Fadanvis
> > >Scientist –B
> > >Indian Institute Of Tropical Meteorology
> > >DR. Homi Bhabha road, Pashan, Pune, India
> > >Ph. No 25893600
> >
> > _________________________________________________________________
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>--
>Bernd Becker The Monthly Outlook
>Met Office FitzRoy Road Exeter Devon EX1 3PB United Kingdom
>Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050
>E-mail:bernd.becker at metoffice.gov.uk - http://www.metoffice.gov.uk
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