Impact of diffuse light on isoprene and monoterpene emissions from amixed temperate forest
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Authors
Laffineur, Q.
Aubinet, M.
Schoon, N.
Amelynck, C.
Muller, J.-F.
Dewulf, J.
Steppe, K.
Heinesch, B.
Discipline
Earth and related Environmental sciences
Subject
Disjunct eddy-covariance
Enzymatic activities
Equivalent temperature
Forest ecosystem
Monoterpene emissions
Production pathways
PTR-MS
Scanning techniques
Charge transfer
Isoprene
Low temperature production
Monoterpenes
Radiation effects
Forestry
isoprene
terpene
cloud cover
eddy covariance
emission
enzyme activity
forest canopy
forest ecosystem
isoprene
light effect
canopy
enzyme activity
forest
light
mass spectrometry
proton transfer reaction mass spectrometry
radiation
temperature
Charge Transfer
Ecosystems
Forests
Isoprene
Monoterpenes
Radiation
Audience
Scientific
Date
2013Metadata
Show full item recordDescription
This 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.
Citation
Laffineur, Q.; Aubinet, M.; Schoon, N.; Amelynck, C.; Muller, J.-F.; Dewulf, J.; Steppe, K.; Heinesch, B. (2013). Impact of diffuse light on isoprene and monoterpene emissions from amixed temperate forest. , Atmospheric Environment, Vol. 74, 385-392, DOI: 10.1016/j.atmosenv.2013.04.025.Identifiers
scopus: 2-s2.0-84877332147
Type
Article
Peer-Review
Yes
Language
eng