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Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0

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Abstract
  • A semi-parametric PAR diffuse radiation model was developed using commonly measured climatic variables from 108 site-years of data from 17 AmeriFlux sites. The model has a logistic form and improves upon previous efforts using a larger data set and physically viable climate variables as predictors, including relative humidity, clearness index, surface albedo and solar elevation angle. Model performance was evaluated by comparison with a simple cubic polynomial model developed for the PAR spectral range. The logistic model outperformed the polynomial model with an improved coefficient of determination and slope relative to measured data (logistic: R² = 0.76; slope = 0.76; cubic: R² = 0.73; slope = 0.72), making this the most robust PAR-partitioning model for the United States currently available.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Copernicus Publications on behalf of the European Geosciences Union. The published article can be found at: http://www.geoscientific-model-development.net/home.html.
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  • Kathilankal, J. C., O'Halloran, T. L., Schmidt, A., Hanson, C. V., & Law, B. E. (2014). Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0. Geoscientific Model Development, 7(5), 2477-2484. doi:10.5194/gmd-7-2477-2014
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  • 7
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  • 5
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  • This research was supported by the Office of Science (BER), US Department of Energy (DOE, Grant nos.DE-FG02-06ER64307 and DE-FG02-06ER64316).
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