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Published in Agron J 91:845-851 (1999)
© 1999 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Estimating Solar Irradiance for Crop Modeling Using Daily Air Temperature Data

Douglas G. Goodina, J.M.S. Hutchinsona, Richard L. Vanderlipb and M.C. Knappb

a Dep. of Geography, Dickens Hall, Kansas State University, Manhattan, KS 66506-0801 USA
b Weather Data Library and Dep. of Communications, Kansas State University, Manhattan, KS 66506 USA



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  		Fig. 1 Location of measurement sites in Kansas. Circles indicate automated stations

 


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  		Fig. 2 The daily air temperature range {Delta}T for the 30-year data period at Manhattan, KS. Note the narrower ranges in the high-sun season. DOY, day of year

 


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  		Fig. 3 Scatterplot for high noontime solar elevation period data at Manhattan, KS

 


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  		Fig. 4 Scatterplot for low noontime solar elevation period data at Manhattan, KS

 


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  		Fig. 5 Scatterplot for full-year data at Manhattan, KS

 


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  		Fig. 6 Measured vs. modeled solar irradiance at Manhattan, KS: (a) high noontime solar elevation angle; (b) low noontime-time solar elevation angle; (c) full year

 


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  		Fig. 7 Seasonal root mean square error (RMSE) for each automated station as a function of latitude difference between the automated station and Manhattan, KS. The outlying Parsons station is represented by the open symbol. The dashed line represents the trend with Parsons included; the solid line is the trend with Parsons deleted

 




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Copyright © 1999 by the American Society of Agronomy.