Photosynthetically active radiation in Moldova

Variability of the Photosynthetically Active Radiation (PAR) measured at the ground- based solar radiation monitoring station at the Chisinau site from 2004 to 2006 is analyzed. Series of days with observations for clear sky conditions was selected from the original PAR and solar radiation datase...

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Autor principal:	Aculinin, Alexandr
Formato:	article
Lenguaje:	EN
Publicado:	D.Ghitu Institute of Electronic Engineering and Nanotechnologies 2008
Materias:	Physics QC1-999 Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/6f20641f2e3342b98b3253ffca3902da
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spelling	oai:doaj.org-article:6f20641f2e3342b98b3253ffca3902da2021-11-21T12:07:50ZPhotosynthetically active radiation in Moldova 2537-63651810-648Xhttps://doaj.org/article/6f20641f2e3342b98b3253ffca3902da2008-02-01T00:00:00Zhttps://mjps.nanotech.md/archive/2008/article/3789https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365Variability of the Photosynthetically Active Radiation (PAR) measured at the ground- based solar radiation monitoring station at the Chisinau site from 2004 to 2006 is analyzed. Series of days with observations for clear sky conditions was selected from the original PAR and solar radiation datasets to study relationship between PAR and global, diffuse and direct solar irradiance, and to evaluate conversion factor for converting PAR values measured with specific PAR sensor from photosynthetic photon flux to PAR in energy units. This selection is necessary to neglect the influence of loudiness upon the measured data. There was proposed a simple power type relationship approximating diurnal variability of PAR and depending on aerosol optical depth. There was demonstrated strong positive correlation between daily totals of PAR and global solar radiation both for clear sky and all-sky conditions, and respective linear equations between these parameters are proposed. Monthly mean values of daily ratios of PAR and global solar radiation for all-sky conditions show distinct seasonal variation with large values observed during cloudy months specific to fall and winter seasons. It is attributed to predominant absorption of solar radiation on aerosols, gases and in clouds occurring outside of PAR spectral domain. For very clear days of observations the growth of daily mean ratio of PAR and solar irradiance was due to increase of aerosol optical depth. There was supposed a simple linear relationship for evaluation of incoming PAR through direct and diffuse solar radiation by applying specific weighting coefficients. For all-sky and for clear sky conditions weighting coefficients amount to ~0.46 and ~0.59, respectively. Analysis of radiometric data acquired during one of the clearest day in time series of observation gives conversion factor which amounts to ~4.65. flux to PAR in energy units. This selection is necessary to neglect the influence of cloudiness upon the measured data. There was proposed a simple power type relationship approximating diurnal variability of PAR and depending on aerosol optical depth. There was demonstrated strong positive correlation between daily totals of PAR and global solar radiation both for clear sky and all-sky conditions, and respective linear equations between these parameters are proposed. Monthly mean values of daily ratios of PAR and global solar radiation for all-sky conditions show distinct seasonal variation with large value to predominant absorption of solar radiation on aerosols, gases and in clouds occurring outside of PAR spectral domain. For very clear days of observations the growth of daily mean ratio of PAR and solar irradiance was due to increase of aerosol optical depth. There was supposed a simple linear relationship for evaluation of incoming PAR through direct and diffuse solar radiation by applying specific weighting coefficients. For all-sky and for clear sky conditions weighting coefficients amount to ~0.46 and ~0.59, respectively. Analysis of radiometric data acquired during one of the clearest day in time series of observation gives conversion factor which amounts to ~4.65. Aculinin, AlexandrD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 7, Iss 1, Pp 115-123 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronics TK7800-8360
spellingShingle	Physics QC1-999 Electronics TK7800-8360 Aculinin, Alexandr Photosynthetically active radiation in Moldova
description	Variability of the Photosynthetically Active Radiation (PAR) measured at the ground- based solar radiation monitoring station at the Chisinau site from 2004 to 2006 is analyzed. Series of days with observations for clear sky conditions was selected from the original PAR and solar radiation datasets to study relationship between PAR and global, diffuse and direct solar irradiance, and to evaluate conversion factor for converting PAR values measured with specific PAR sensor from photosynthetic photon flux to PAR in energy units. This selection is necessary to neglect the influence of loudiness upon the measured data. There was proposed a simple power type relationship approximating diurnal variability of PAR and depending on aerosol optical depth. There was demonstrated strong positive correlation between daily totals of PAR and global solar radiation both for clear sky and all-sky conditions, and respective linear equations between these parameters are proposed. Monthly mean values of daily ratios of PAR and global solar radiation for all-sky conditions show distinct seasonal variation with large values observed during cloudy months specific to fall and winter seasons. It is attributed to predominant absorption of solar radiation on aerosols, gases and in clouds occurring outside of PAR spectral domain. For very clear days of observations the growth of daily mean ratio of PAR and solar irradiance was due to increase of aerosol optical depth. There was supposed a simple linear relationship for evaluation of incoming PAR through direct and diffuse solar radiation by applying specific weighting coefficients. For all-sky and for clear sky conditions weighting coefficients amount to ~0.46 and ~0.59, respectively. Analysis of radiometric data acquired during one of the clearest day in time series of observation gives conversion factor which amounts to ~4.65. flux to PAR in energy units. This selection is necessary to neglect the influence of cloudiness upon the measured data. There was proposed a simple power type relationship approximating diurnal variability of PAR and depending on aerosol optical depth. There was demonstrated strong positive correlation between daily totals of PAR and global solar radiation both for clear sky and all-sky conditions, and respective linear equations between these parameters are proposed. Monthly mean values of daily ratios of PAR and global solar radiation for all-sky conditions show distinct seasonal variation with large value to predominant absorption of solar radiation on aerosols, gases and in clouds occurring outside of PAR spectral domain. For very clear days of observations the growth of daily mean ratio of PAR and solar irradiance was due to increase of aerosol optical depth. There was supposed a simple linear relationship for evaluation of incoming PAR through direct and diffuse solar radiation by applying specific weighting coefficients. For all-sky and for clear sky conditions weighting coefficients amount to ~0.46 and ~0.59, respectively. Analysis of radiometric data acquired during one of the clearest day in time series of observation gives conversion factor which amounts to ~4.65.
format	article
author	Aculinin, Alexandr
author_facet	Aculinin, Alexandr
author_sort	Aculinin, Alexandr
title	Photosynthetically active radiation in Moldova
title_short	Photosynthetically active radiation in Moldova
title_full	Photosynthetically active radiation in Moldova
title_fullStr	Photosynthetically active radiation in Moldova
title_full_unstemmed	Photosynthetically active radiation in Moldova
title_sort	photosynthetically active radiation in moldova
publisher	D.Ghitu Institute of Electronic Engineering and Nanotechnologies
publishDate	2008
url	https://doaj.org/article/6f20641f2e3342b98b3253ffca3902da
work_keys_str_mv	AT aculininalexandr photosyntheticallyactiveradiationinmoldova
_version_	1718419192920670208

Photosynthetically active radiation in Moldova

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