An Evaluation of Semiempirical Models for Partitioning Photosynthetically Active Radiation Into Diffuse and Direct Beam Components

Oliphant, Andrew J.; Stoy, Paul C.

doi:10.1002/2017jg004370

Title: An Evaluation of Semiempirical Models for Partitioning Photosynthetically Active Radiation Into Diffuse and Direct Beam Components

Journal Article · Tue Feb 13 00:00:00 EST 2018 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1002/2017jg004370· OSTI ID:1537331

^[1];

^[2]

San Francisco State Univ., CA (United States)
Montana State Univ., Bozeman, MT (United States)

Abstract Photosynthesis is more efficient under diffuse than direct beam photosynthetically active radiation (PAR) per unit PAR, but diffuse PAR is infrequently measured at research sites. We examine four commonly used semiempirical models (Erbs et al., 1982, https://doi.org/10.1016/0038‐092X(82)90302‐4 ; Gu et al., 1999, https://doi.org/10.1029/1999JD901068 ; Roderick, 1999, https://doi.org/10.1016/S0168‐1923(99)00028‐3 ; Weiss & Norman, 1985, https://doi.org/10.1016/0168‐1923(85)90020‐6 ) that partition PAR into diffuse and direct beam components based on the negative relationship between atmospheric transparency and scattering of PAR. Radiation observations at 58 sites (140 site years) from the La Thuille FLUXNET data set were used for model validation and coefficient testing. All four models did a reasonable job of predicting the diffuse fraction of PAR ( ϕ ) at the 30 min timescale, with site median r ² values ranging between 0.85 and 0.87, model efficiency coefficients (MECs) between 0.62 and 0.69, and regression slopes within 10% of unity. Model residuals were not strongly correlated with astronomical or standard meteorological variables. We conclude that the Roderick (1999, https://doi.org/10.1016/S0168‐1923(99)00028‐3 ) and Gu et al. (1999, https://doi.org/10.1029/1999JD901068 ) models performed better overall than the two older models. Using the basic form of these models, the data set was used to find both individual site and universal model coefficients that optimized predictive accuracy. A new universal form of the model is presented in section 5 that increased site median MEC to 0.73. Site‐specific model coefficients increased median MEC further to 0.78, indicating usefulness of local/regional training of coefficients to capture the local distributions of aerosols and cloud types.

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Research Organization:: Oregon State Univ., Corvallis, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER63911; FG02-04ER63917

OSTI ID:: 1537331

Alternate ID(s):: OSTI ID: 1434362

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 123, Issue 3; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Title: An Evaluation of Semiempirical Models for Partitioning Photosynthetically Active Radiation Into Diffuse and Direct Beam Components

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