Dear all,

though a bit nitpicking, but:

Watts are of course _not_ expressed in W/s!

1 Watt per definition is 1 J/s.

So solar radiation expressed in W/m2 is equal solar radiation expressed in J/(sec * m2)

Everything else is playing around and converting from seconds to day and to Mega-Joule. (Should be straight forward)

Regards,
Rolf

==============================================
Dr. Rolf Sommer
International Center for Agricultural Research
in the Dry Areas (ICARDA)
P.O. Box 5466, Aleppo, Syria
Tel 00963 21 2213433
and
ZEF, Center for Development Research
Department of Ecology and Resource Management
University of Bonn
Walter-Flex-Str. 3
53113 Bonn Germany
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> -----Original Message-----
> From: DSSAT - Crop Models and Applications
> [mailto:[log in to unmask]] On Behalf Of Gerrit Hoogenboom
> Sent: Thursday, May 24, 2007 05:24
> To: [log in to unmask]
> Subject: Re: I NEED HELP CONVERT DATA CLIMATIC
>
> Camerino Rojas Montes,
>
> 1 Ws/2 = 1 J/m2
>
> Watts is normally expressed as W/s, which is the
> equivalent of radiation intensity. You,
> therefore, need to integrate the intensity over
> the day in order to calculate total energy  = MJ/m2/day.
>
> Regards,
>
> Gerrit
>
>
>
> At 09:31 PM 05/23/2007, you wrote:
>
> >I UNDERSTAND WHICH DSSAT OPERATE WITH CLIMATIC
> >DATA OF SOLAR RADIATION IN Megajoules/m2 BUT MY
> >WEATHER STATION TO CAST OUT DATA SOLAR RADIATION
> >IN Watss/m2.<?xml:namespace prefix = o ns =
> >"urn:schemas-microsoft-com:office:office" />
> >
> >
> >
> >I NEED HELP FOR CONVERT Watss/m2 TO Joules/m2.
> >
> >
> >
> >THANKS.
> >
> >
> >
> >CAMERINO ROJAS MONTES.
> >
> >UNIVERSIDAD AUTONOMA AGRARIA ANTONIO NARRO.
> >
> >SALTILLO, COAHUILA, MEXICO.
> >
> >
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