Units of Precipitation,U,V wind etc. in ERA 40 datasets
José Paulo Bonatti
bonatti at CPTEC.INPE.BR
Fri Nov 10 07:08:39 EST 2006
Dear Sajjad
At the mentioned page enter in
sajjad saeed wrote:
> 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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--
*****************************************************************
Jose Paulo Bonatti
Dr. em Meteorologia - Pesquisador Titular
Instituto Nacional de Pesquisas Espaciais - INPE
Centro de Previsao de Tempo e Estudos Climaticos - CPTEC
Divisao de Modelagem e Desenvolvimento - DMD
(http://www.cptec.inpe.br/)
Rodovia Presidente Dutra, km 40 SPRJ
12630-000 Cachoeira Paulista - SP - Brasil
Tel: (+55) (12) 3186.8421 Fax: (+55) (12) 3101.2835
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