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Estimating the Photosynthetically Active Radiation Under Clear Skies by Means of a New Approach : Volume 12, Issue 1 (18/02/2015)

By Wandji Nyamsi, W.

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Book Id: WPLBN0003973668
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Estimating the Photosynthetically Active Radiation Under Clear Skies by Means of a New Approach : Volume 12, Issue 1 (18/02/2015)  
Author: Wandji Nyamsi, W.
Volume: Vol. 12, Issue 1
Language: English
Subject: Science, Advances, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Blanc, P., Wald, L., Espinar, B., & Nyamsi, W. W. (2015). Estimating the Photosynthetically Active Radiation Under Clear Skies by Means of a New Approach : Volume 12, Issue 1 (18/02/2015). Retrieved from

Description: MINES ParisTech, PSL Research University, O. I. E. – Centre Observation, Impacts, Energy, Sophia Antipolis CEDEX, France. 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.

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

Gueymard, C.: The sun's total and the spectral irradiance for solar energy applications and solar radiations models, Solar Energy, 76, 423–452, 2004.; Jacovides, C. P., Timvios, F. S., Papaioannou, G., Asimakopoulos, D. N., and Theofilou, C. M.: Ratio of PAR to broadband solar radiation measured in Cyprus, Agr. Forest. Meteorol., 121, 135–140, 2004.; Kato, S., Ackerman, T., Mather, J., and Clothiaux, E.: The k-distribution method and correlated-k approximation for shortwave radiative transfer model, J. Quant. Spectrosc. Ra., 62, 109–121, 1999.; Lefèvre, M., Oumbe, A., Blanc, P., Espinar, B., Gschwind, B., Qu, Z., Wald, L., Schroedter-Homscheidt, M., Hoyer-Klick, C., Arola, A., Benedetti, A., Kaiser, J. W., and Morcrette, J.-J.: McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions, Atmos. Meas. Tech., 6, 2403–2418, doi:10.5194/amt-6-2403-2013, 2013.; Mayer, B. and Kylling, A.: Technical note: The libRadtran software package for radiative transfer calculations – description and examples of use, Atmos. Chem. Phys., 5, 1855–1877, doi:10.5194/acp-5-1855-2005, 2005.; McCree, K. J.: Test of current definitions of photosynthetically active radiation against leaf photosynthesis data, Agric. Meteorol., 10, 443–453, 1972.; Oumbe, A., Blanc, P., Gschwind, B., Lefevre, M., Qu, Z., Schroedter-Homscheidt, M., and Wald, L.: Solar irradiance in clear atmosphere: study of parameterisations of change with altitude, Adv. Sci. Res., 6, 199–203, doi:10.5194/ASR-6-199-2011, 2011.; Udo, S. O. and Aro, T. O.: Global PAR related to global solar radiation for central Nigeria, Agr. Forest. Meteorol, 97, 21–31, 1999.; Wandji Nyamsi, W., Espinar, B., Blanc, P., and Wald, L.: How close to detailed spectral calculations is the k-distribution method and correlated-k approximation of Kato et al. (1999) in each spectral interval?, Meteorol. Z., 23, 547–556, doi:10.1127/metz/2014/0607, 2014.


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