Title: Snowy backgrounds enhance the absorption of visible light in forest canopies
Authors: PINTY BernardWIDLOWSKI Jean-LucVERSTRAETE MichelANDREDAKIS IoannisARINO OlivierCLERICI MarcoKAMINSKI ThomasTABERNER Malcolm
Citation: GEOPHYSICAL RESEARCH LETTERS vol. 38 no. L06404 p. 1-5
Publisher: AMER GEOPHYSICAL UNION
Publication Year: 2011
JRC N°: JRC63282
ISSN: 0094-8276
URI: http://www.agu.org/pubs/crossref/2011/2010GL046417.shtml
http://publications.jrc.ec.europa.eu/repository/handle/JRC63282
DOI: 10.1029/2010GL046417
Type: Articles in Journals
Abstract: The fraction of radiation absorbed in the canopy depends on the amount and angular distribution of the solar irradiance reaching the top of the canopy as well as the fraction of this irradiance that is transmitted through the canopy gaps and reflected back to the vegetation by the background. This contribution shows that the presence of snow on forest floors enhances the fraction of absorbed Photosynthetically Active Radiation (PAR). A global analysis of satellite-derived products reveals that this enhancement affects evergreen and deciduous forests of the boreal zone. This snow-related effect may usefully contribute to the photosynthesis process in evergreen forests especially during spring time when radiation conditions are marginal but other physiological constraints (such as temperature) permit the necessary biochemical functions to take place.
JRC Institute:Institute for Environment and Sustainability

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