Ratio of PAR to broadband solar radiation measured in Cyprus

Jacovides, C.P.; Timvios, F.S; Papaioannou, Georgia; Asimakopoulos, D. N.; Theofilou, C.M

doi:10.1016/j.agrformet.2003.10.001

Cited by 110 publications

(92 citation statements)

References 13 publications

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“…Photosynthetically active radiation (PAR) is often regarded as the portion of the solar spectrum extending from 0.4 to 0.7 μm (McCree 1972; Alados and Alados-Arboledas 1999; Jacovides et al 2004). PAR is important as it is the sole energy source used by plants for photosynthesis reactions that partially convert physical solar energy into bioenergy-carrying biomass (Mariscal et al 2000;Tsubo and Walker 2005;Myers 2005).…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…The correlation coefficient is greater than 0.99. It is also shown that the proposed technique provides better results than two state-of-the-art empirical methods estimating the global PPFD from the global irradiance (Jacovides et al, 2004;Udo and Aro, 1999).…”

Section: Discussionmentioning

confidence: 98%

“…These figures prove the good level of performance of the proposed technique. Figure 2 exhibits the statistical indicators for Q P obtained by the methods of Jacovides et al (2004), Udo and Aro (1999), weighted sum and the proposed technique. The method of Jacovides et al underestimates the PAR by −7.4 %; the relative RMSE is 9.6 %.…”

Section: Performance Of the Proposed Techniquementioning

confidence: 99%

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Estimating the photosynthetically active radiation under clear skies by means of a new approach

et al. 2015

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Abstract. The k-distribution method and the correlated-k approximation of Kato et al. (1999) is a computationally efficient approach originally designed for calculations of the broadband solar radiation by dividing the solar spectrum in 32 specific spectral bands from 240 to 4606 nm. This paper describes a technique for an accurate assessment of the photosynthetically active radiation (PAR) from 400 to 700 nm at ground level, under clear-sky conditions using twelve of these spectral bands. It is validated against detailed spectral calculations of the PAR made by the radiative transfer model libRadtran. For the direct and global PAR irradiance, the bias is −0.4 W m −2 (−0.2 %) and −4 W m −2 (−1.3 %) and the root mean square error is 1.8 W m −2 (0.7 %) and 4.5 W m −2 (1.5 %). For the direct and global Photosynthetic Photon Flux Density, the biases are of about +10.3 µmol m −2 s −1 (+0.8 %) and 1.9 µmol m −2 s −1 (−0.1 %) respectively, and the root mean square error is 11.4 µmol m −2 s −1 (0.9 %) and 4.0 µmol m −2 s −1 (0.3 %). The correlation coefficient is greater than 0.99. This technique provides much better results than two state-of-the-art empirical methods computing the daily mean of PAR from the daily mean of broadband irradiance.

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“…Furthermore, fixation of one CO molecule during 2 photosynthesis necessitates a quantum requirement of eight, which results in a maximum utilization of only 27% of the PAR absorbed by the photosynthetic system [35]. An additional 10% loss is identified as photo transmission losses.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Assessment of Algal Biomass Potential for Carbon Mitigation and Biofuel Production

Sudhakar¹,

Premalatha²,

Azad³

2012

IJEE

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Abstract:In view of ever increasing global demand for energy, there has been substantial interest in developing renewable biologically produced fuel. Microalgae are one such emerging resource considered as an alternative for biodiesel production. However its realistic potential is often either over estimated or underestimated. In view of this, a rigorous assessment is carried out to evaluate the realistic potential of micro algal biodiesel based on photosynthesis, thermodynamics and physical assumptions. This paper identifies six best regions in each continent for algal biomass cultivation considering both sunlight and local climatic conditions. The mean hourly meteorological data, sunlight, ambient temperature and rainfall information for the identified potential site is combined to estimate annual biomass production, lipid production and carbon mitigation potential. Maximum possible algal biomass yield and oil productivity have been estimated for six global sites at three different scenarios of photosynthetic efficiency 11.42, 6 and 3%. The upper optimistic biomass, oil yield and carbon fixation potential was calculated to be 533 T/ha/yr, 1, 25, 333 L/ha/yr. and 95 Tons CO /ha/yr. This study 2 provides a baseline data for theoretical maximum, minimum and best estimates of open pond microalgae production systems.

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Ratio of PAR to broadband solar radiation measured in Cyprus

Cited by 110 publications

References 13 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

Estimating the photosynthetically active radiation under clear skies by means of a new approach

Theoretical Assessment of Algal Biomass Potential for Carbon Mitigation and Biofuel Production

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