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

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

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,...

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Main Authors: J. C. Kathilankal, T. L. O'Halloran, A. Schmidt, C. V. Hanson, B. E. Law
Format: Article
Language:English
Published: Copernicus Publications 2014-10-01
Series:Geoscientific Model Development
Online Access:http://www.geosci-model-dev.net/7/2477/2014/gmd-7-2477-2014.pdf
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spelling doaj-c7992013fd8b4fb186af7fc6cc523b232020-11-24T22:23:53ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032014-10-01752477248410.5194/gmd-7-2477-2014Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0J. C. Kathilankal0T. L. O'Halloran1A. Schmidt2C. V. Hanson3B. E. Law4LI-COR Inc. 4647 Superior Street, Lincoln, NE 68504, USASweet Briar College, Department of Environmental Sciences, Sweet Briar, VA 24595, USADepartment of Forest Ecosystems and Society College of Forestry, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, USADepartment of Forest Ecosystems and Society College of Forestry, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, USADepartment of Forest Ecosystems and Society College of Forestry, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, USAA 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: <i>R</i><sup>2</sup> = 0.76; slope = 0.76; cubic: <i>R</i><sup>2</sup> = 0.73; slope = 0.72), making this the most robust PAR-partitioning model for the United States currently available.http://www.geosci-model-dev.net/7/2477/2014/gmd-7-2477-2014.pdf
collection DOAJ
language English
format Article
sources DOAJ
author J. C. Kathilankal
T. L. O'Halloran
A. Schmidt
C. V. Hanson
B. E. Law
spellingShingle J. C. Kathilankal
T. L. O'Halloran
A. Schmidt
C. V. Hanson
B. E. Law
Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0
Geoscientific Model Development
author_facet J. C. Kathilankal
T. L. O'Halloran
A. Schmidt
C. V. Hanson
B. E. Law
author_sort J. C. Kathilankal
title Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0
title_short Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0
title_full Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0
title_fullStr Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0
title_full_unstemmed Development of a semi-parametric PAR (Photosynthetically Active Radiation) partitioning model for the United States, version 1.0
title_sort development of a semi-parametric par (photosynthetically active radiation) partitioning model for the united states, version 1.0
publisher Copernicus Publications
series Geoscientific Model Development
issn 1991-959X
1991-9603
publishDate 2014-10-01
description 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: <i>R</i><sup>2</sup> = 0.76; slope = 0.76; cubic: <i>R</i><sup>2</sup> = 0.73; slope = 0.72), making this the most robust PAR-partitioning model for the United States currently available.
url http://www.geosci-model-dev.net/7/2477/2014/gmd-7-2477-2014.pdf
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