RT info:eu-repo/semantics/article
T1 Photosynthetic active radiation, solar irradiance and the CIE standard sky classification
A1 García Rodríguez, Ana
A1 García Rodríguez, Sol
A1 Diez Mediavilla, Montserrat
A1 Alonso Tristán, Cristina
K1 photosynthetic active radiation
K1 CIE standard skies
K1 solar irradiance
K1 Ingeniería eléctrica
K1 Electric engineering
AB Plant growth is directly related to levels of photosynthetic photon flux density, Qp.The improvement of plant-growth models therefore requires accurate estimations of the Qp parameterthat is often indirectly calculated on the basis of its relationship with solar irradiation, RS, due tothe scarcity of ground measurements of photosynthetic photon flux density. In this experimentalcampaign in Burgos, Spain, between April 2019 and January 2020, an average value of the Qp/Rs ratiois determined on the basis of measurements at ten-minute intervals. The most influential factor in theQp/Rs ratio, over and above any daily or seasonal pattern, is the existence of overcast sky conditions.The CIE standard sky classification can be used to establish an unequivocal characterization of thecloudiness conditions of homogeneous skies. In this study, the relation between the CIE standard skytype and Qp/Rs is investigated. Its conclusions were that the Qp/Rs values, the average of whichwas 1.93   0.15  mol J�����1, presented statistically significant di erences for each CIE standard skytype. The overcast sky types presented the highest values of the ratio, while the clear sky categoriespresented the lowest and most dispersed values. During the experimental campaign, only twoexceptions were noted for covered and partial covered sky-type categories, respectively, sky types5 and 9. Their values were closer to those of categories classified as clear sky according to the CIEstandard. Both categories presented high uniformity in terms of illumination.
PB MDPI
YR 2020
FD 2020-11
LK http://hdl.handle.net/10259/5687
UL http://hdl.handle.net/10259/5687
LA eng
NO Spanish Ministry of Science and Innovation, grant number RTI2018-098900-B-I00 and Consejería de Educación, Junta de Castilla y León, grant number BU021G19
DS Repositorio Institucional de la Universidad de Burgos
RD 29-abr-2024