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,...
| Main Authors: | , , , , |
|---|---|
| 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 |
| Summary: | 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. |
|---|---|
| ISSN: | 1991-959X 1991-9603 |