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dc.contributor.authorLaffineur, Q.
dc.contributor.authorAubinet, M.
dc.contributor.authorSchoon, N.
dc.contributor.authorAmelynck, C.
dc.contributor.authorMuller, J.-F.
dc.contributor.authorDewulf, J.
dc.contributor.authorSteppe, K.
dc.contributor.authorHeinesch, B.
dc.date2013
dc.date.accessioned2016-03-25T11:11:10Z
dc.date.available2016-03-25T11:11:10Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/2908
dc.descriptionThis study investigated the impact of diffuse light on canopy scale emission of isoprene and monoterpenes measured continuously above a mixed temperate forest, using the disjunct eddy-covariance by mass scanning technique with a proton transfer reaction-mass spectrometer (PTR-MS) instrument. To assess this impact, the relationship between emissions/radiation and emissions/gross primary production (GPP) under clear sky and cloudy conditions were analysed. Under cloudy conditions (high proportion of diffuse radiation), the isoprene and monoterpene fluxes were enhanced compared to clear sky conditions (low proportion of diffuse radiation) at equivalent temperature and above-canopy total radiation. The whole-canopy enzymatic activity of the metabolic isoprene production pathway, however, was suggested to be lower under cloudy conditions than under clear sky conditions at equivalent temperature. The mechanisms behind these observations are probably linked to the better penetration of diffuse radiation in the canopy. Shade leaves/needles receive more radiation in cloudy conditions than in clear sky conditions, thereby inducing the observed effects.
dc.languageeng
dc.titleImpact of diffuse light on isoprene and monoterpene emissions from amixed temperate forest
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeDisjunct eddy-covariance
dc.subject.freeEnzymatic activities
dc.subject.freeEquivalent temperature
dc.subject.freeForest ecosystem
dc.subject.freeMonoterpene emissions
dc.subject.freeProduction pathways
dc.subject.freePTR-MS
dc.subject.freeScanning techniques
dc.subject.freeCharge transfer
dc.subject.freeIsoprene
dc.subject.freeLow temperature production
dc.subject.freeMonoterpenes
dc.subject.freeRadiation effects
dc.subject.freeForestry
dc.subject.freeisoprene
dc.subject.freeterpene
dc.subject.freecloud cover
dc.subject.freeeddy covariance
dc.subject.freeemission
dc.subject.freeenzyme activity
dc.subject.freeforest canopy
dc.subject.freeforest ecosystem
dc.subject.freeisoprene
dc.subject.freelight effect
dc.subject.freecanopy
dc.subject.freeenzyme activity
dc.subject.freeforest
dc.subject.freelight
dc.subject.freemass spectrometry
dc.subject.freeproton transfer reaction mass spectrometry
dc.subject.freeradiation
dc.subject.freetemperature
dc.subject.freeCharge Transfer
dc.subject.freeEcosystems
dc.subject.freeForests
dc.subject.freeIsoprene
dc.subject.freeMonoterpenes
dc.subject.freeRadiation
dc.source.titleAtmospheric Environment
dc.source.volume74
dc.source.page385-392
Orfeo.peerreviewedYes
dc.identifier.doi10.1016/j.atmosenv.2013.04.025
dc.identifier.scopus2-s2.0-84877332147


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