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Regulated large-scale annual shutdown of Amazonian isoprene emissions?

dc.contributor.authorBarkley, M.P.
dc.contributor.authorPalmer, P.I.
dc.contributor.authorDe Smedt, I.
dc.contributor.authorKarl, T.
dc.contributor.authorGuenther, A.
dc.contributor.authorVan Roozendael, M.
dc.date2009
dc.date.accessioned2016-04-05T12:42:17Z
dc.date.available2016-04-05T12:42:17Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/3283
dc.descriptionWe perform Empirical Orthogonal Function (EOF) analysis on 12 years of global GOME and SCIAMACHY formaldehyde (HCHO) column observations to determine the most significant spatial and temporal HCHO variations. In most regions, we find that HCHO variability is predominantly driven by seasonal variations of biogenie emissions and biomass burning. However, unusually low HCHO columns are consistently observed over the Amazon rainforest during the transition from the wet-to-dry seasons. We use MODIS leaf area and enhanced vegetation indices, to show variations in vegetation are consistent with the observed decrease in HCHO during this period (correlations of 0.69 and 0.67, respectively). Based on this evidence, we suggest isoprene emitting vegetation experience widespread leaf flushing (new leaf growth) prior to the dry season, resulting in a large-scale annual shutdown of Amazonian isoprene emissions. © 2009.
dc.languageeng
dc.titleRegulated large-scale annual shutdown of Amazonian isoprene emissions?
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeAmazon rain forest
dc.subject.freeBiomass-burning
dc.subject.freeDry seasons
dc.subject.freeEmpirical orthogonal function analysis
dc.subject.freeEnhanced vegetation index
dc.subject.freeIsoprene emission
dc.subject.freeLeaf area
dc.subject.freeLeaf flushing
dc.subject.freeLeaf growth
dc.subject.freeSeasonal variation
dc.subject.freeBiomass
dc.subject.freeDrought
dc.subject.freeFourier analysis
dc.subject.freeVegetation
dc.subject.freebiogenic emission
dc.subject.freebiomass burning
dc.subject.freeformaldehyde
dc.subject.freeGOME
dc.subject.freeisoprene
dc.subject.freeleaf area
dc.subject.freeMODIS
dc.subject.freerainforest
dc.subject.freeSCIAMACHY
dc.subject.freeseasonal variation
dc.subject.freespatiotemporal analysis
dc.subject.freevegetation index
dc.subject.freeAmazonia
dc.subject.freeSouth America
dc.source.titleGeophysical Research Letters
dc.source.volume36
dc.source.issue4
dc.source.pageL04803
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2008GL036843
dc.identifier.scopus2-s2.0-66149164600


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