Dear Rolf,

MT-Clim provides daytime (i.e. from sunrise to sunset) average solar
radiation. Daylength (in seconds) is also provided by MTClim (at least
by the MS-DOS version, I am not familiar with the Excel version), so you
may use that to estimate daily sums.

Comparing with our measurements in Hungary the agreement between
measured and observed data was quite good (i.e. bias-free).

I hope this helps.

Kind regards,
Zoltan

Sommer, Rolf (ICARDA) wrote:
> Dear all,
>
>
>
> I am using MT-CLIM for Excel (0.4 beta;
> http://www.ntsg.umt.edu/models/bgc/index.php?option=com_weblinks&catid=1
> 8&Itemid=32) to estimate solar radiation and humidity from daily Tmax,
> Tmin and precipitation. (This is based on the improved Bristow-Campbell
> model invented by Thornton and Running in 1999.)
>
> However, I am getting somewhat confused by the magnitude of the results
> produced:
>
> MT-CLIM predicted solar radiation in summer often exceeds 500 Watt/m2
> (daily average ...I assume...), i.e. 40 MJ/m2/day, whereas corresponding
> observed data never surpass 31 MJ/m2/day.
>
> Same problem (much too high predicted solar radiation) with the default
> data set that is included in the Excel version of the model, meaning
> that the problem does not lie in my data, but in my apparently limited
> ability to make sense out of the results.
>
> Anybody who could solve this mystery?
>
>
>
> Best regards,
>
> Rolf
>
> ==============================================
>
> Dr. Rolf Sommer
>
> Soil Fertility and Agro-Ecosystem Modeling
>
> International Center for Agricultural Research
>
> in the Dry Areas (ICARDA)
>
> www.ICARDA.org
>
> P.O. Box 5466, Aleppo, Syria
>
> Tel 00963 21 2691 2545
>
> P Help save paper - do you really need to print this email?
>
> ==============================================
>
>
>

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dr. Zoltan BARCZA            E-mail: [log in to unmask]
Department of Meteorology       Web: http://bzoli.web.elte.hu
Eotvos Lorand University      Phone: (+36 1) 372-2500/6603
Budapest, 1518 P.O.Box 32       Fax: (+36 1) 372-2904
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