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Dear Mubashar,<br>
<br>
ERA Int is not data, but a model product. Reanalysis is notoriously
bad at reproducing surface observations, as the surface values are
the result of a model calculation and do not assimilate surface
observations directly. Furthermore, data every 6 hours cannot
resolve the diurnal cycle. If you insist on using ERA Int, get the
hourly values from them.<br>
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Alan
Alan Robock, Professor II (Distinguished Professor)
Editor, Reviews of Geophysics
Director, Meteorology Undergraduate Program
Associate Director, Center for Environmental Prediction
Department of Environmental Sciences Phone: +1-732-932-9800 x6222
Rutgers University Fax: +1-732-932-8644
14 College Farm Road E-mail: <a class="moz-txt-link-abbreviated" href="mailto:robock@envsci.rutgers.edu">robock@envsci.rutgers.edu</a>
New Brunswick, NJ 08901-8551 USA <a class="moz-txt-link-freetext" href="http://envsci.rutgers.edu/~robock">http://envsci.rutgers.edu/~robock</a>
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<br>
On 3/8/2011 8:33 AM, Mubashar Dogar wrote:
<blockquote
cite="mid:AANLkTimp-CP2YYZ-yuJ19ZORHh46RTssyZDZuW0HPSUv@mail.gmail.com"
type="cite">
<div dir="ltr">Dear gradusers,<br>
<br>
I am interested to see the diurnal averages of surface
temperature over saudi arabia. Actually I have 22 years 'ERA
Int' data having 4 time steps in each day (6 hourly). I would
like to calculate diurnal mean cycle such that I left with only
4 points to see on the graph. How to check it in grads.<br>
<br>
Regards,<br>
<br>
Mubashar<br>
</div>
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