Photosynthetically active radiation: measurements and modelling

Alados, I.; Foyo-Moreno, I.; Alados-Arboledas, Lucas

doi:10.1016/0168-1923(95)02245-7

Cited by 179 publications

(136 citation statements)

References 17 publications

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“…The physics-based models have a reasonable and reliable scientific underpinning but are often complex, owing to the difficulty in obtaining data for all of the required parameters. Thus, their detailed requirements make them difficult and costly to use, especially if they are fully developed (Alados et al 1996). In contrast, empirical models have been shown to be both reasonable and useful in practice (Al-Shooshan 1997).…”

Section: Predicting Par Valuesmentioning

confidence: 99%

“…Both fE and fFEC are two important characteristics of PAR because they are closely related to light use efficiency in plant growth (McCree 1972;Papaionnou et al 1993;Alados et al 1996). They also have important implications for global climate change and other environmental issues (Hanan et al 2002).…”

Section: Variability Of Par Valuesmentioning

confidence: 99%

“…Precise estimation of incident PAR is therefore essential in assessing and modeling plant growth and biological production management in different vegetative ecosystems (Alados and Alados-Arboledas 1999). Such estimation could be integrated with plant growth models and decision-making systems to optimize vegetation management activities and solar energy conversion efficiency into bioenergy-loading biomass (Spitters et al 1986;Papaionnou et al 1993;Alados et al 1996;Gueymard 2000). Even though PAR is extremely important, it is often not measured in most meteorological stations around the world; therefore, it has to be estimated from the commonly measured global solar radiation (R S ).…”

Section: Introductionmentioning

confidence: 99%

“…Even though PAR is extremely important, it is often not measured in most meteorological stations around the world; therefore, it has to be estimated from the commonly measured global solar radiation (R S ). As a result, PAR is usually estimated with other measured variables as follows, using one of three approaches: (a) the fractional energy of PAR to global solar radiation (fE; Kvifte et al 1983;Papaionnou et al 1993;Udo and Aro 1999;Mõttus et al 2001;Tsubo and Walker 2005), (b) the fraction of photon flux/energy conversion of PAR (fFEC; Alados et al 1996;Aro 1999, 2000;Alados et al 1996;Alados and Alados-Arboledas 1999;Al-Shooshan 1997;Finch et al 2004;Jacovides, et al 2004Jacovides, et al , 2007, or (c) the PAR photon flux density (PPFD;McCree 1966;Papaionnou et al 1993;Alados et al 1996;Jacovides et al 2004). Such processes were driven by different quantitative methods (McCree 1972;McCartney 1978;Udo and Aro 1999), and each method has its positive and negative attributes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dynamics of photosynthetic photon flux density (PPFD) and estimates in coastal northern California

Smith

Jacovides

et al. 2010

Theor Appl Climatol

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Section: Predicting Par Valuesmentioning

confidence: 99%

Section: Variability Of Par Valuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamics of photosynthetic photon flux density (PPFD) and estimates in coastal northern California

Smith

Jacovides

et al. 2010

Theor Appl Climatol

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“…where P c is the rate of chlorophyll-a dependent oxygen production in mg O 2¨m g Chl-a´1¨h´1, Chl-a is the chlorophyll-a concentration in mg¨L´1, R s is the broadband solar radiation in kW¨m´2, and α par is the ratio of PAR to broadband solar radiation in m 2¨k W´1 for the studied region, which is often calculated as a constant ratio [36]. P max is the maximum oxygen production rate by photosynthesis at saturating lighting conditions (mg O 2 (mg Chl-aˆh)´1).…”

Section: Oxygen Production By Photosynthesismentioning

confidence: 99%

A Deterministic Model for Predicting Hourly Dissolved Oxygen Change: Development and Application to a Shallow Eutrophic Lake

2016

Water

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Predicting dissolved oxygen (DO) change at a high frequency in water bodies is useful for water quality management. In this study, we developed a deterministic model that can predict hourly DO change in a water body with high frequency weather parameters. The study was conducted during August 2008-July 2009 in a eutrophic shallow lake in Louisiana, USA. An environment monitoring buoy was deployed to record DO, water temperature and chlorophyll-a concentration at 15-min intervals, and hourly weather data including air temperature, precipitation, wind speed, relative humidity, and solar radiation were gathered from a nearby weather station. These data formed a foundation for developing a DO model that predicts rapid change of source and sink components including photosynthesis, re-aeration, respiration, and oxygen consumption by sediments. We then applied the model to a studied shallow lake that is widely representative of lake water conditions in the subtropical southern United States. Overall, the model successfully simulated high-time fluctuation of DO in the studied lake, showing good predictability for extreme algal bloom events. However, a knowledge gap still exists in accurately quantifying oxygen source produced by photosynthesis in high frequency DO modeling.

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Validation of an empirical model for photosynthetically active radiation

Alados

Alados-Arboledas

1999

Int. J. Climatol.

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Knowledge of the photosynthetically active radiation is necessary in different applications dealing with plant physiology, biomass production and natural illumination in greenhouses. Nevertheless, as a result of the absence of widespread measurements of this radiometric flux, it is often calculated as a constant ratio of the broadband solar radiation. This ratio is affected by many parameters. In a previous study, the authors analysed the global horizontal component of this flux. In this work, they validate the model against two independent data sets, one acquired at the same place where the previous model was developed and the other acquired at another location characterised by different climatic conditions. The first one is located at the University of Almería, a seashore location (36.83°N, 2.41°W, 20 m a.m.s.l.), while the second one is located at Granada (37.18°N, 3.58°W, 660 m a.m.s.l.), an inland location. The database includes hourly values of the relevant variables that cover the years 1993 and 1994 in Almería and 1994 and 1995 in Granada. The use of data sets registered in two different climatic conditions allows for the verification of the local independence of the proposed technique. The proposed models can provide estimates of the photosynthetically active radiation with negligible bias and root mean square deviations close to instrumental errors.

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Photosynthetically active radiation: measurements and modelling

Cited by 179 publications

References 17 publications

Dynamics of photosynthetic photon flux density (PPFD) and estimates in coastal northern California

Dynamics of photosynthetic photon flux density (PPFD) and estimates in coastal northern California

A Deterministic Model for Predicting Hourly Dissolved Oxygen Change: Development and Application to a Shallow Eutrophic Lake

Validation of an empirical model for photosynthetically active radiation

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