Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18242
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dc.contributor.authorJardine, Kolby J.-
dc.contributor.authorYáñez-Serrano, Ana Maria-
dc.contributor.authorArneth, Almuth-
dc.contributor.authorAbrell, Leif-
dc.contributor.authorJardine, Angela B.-
dc.contributor.authorvan Haren, Joost L.M.-
dc.contributor.authorArtaxo, Paulo-
dc.contributor.authorRizzo, L. V.-
dc.contributor.authorIshida, Francoise Yoko-
dc.contributor.authorKarl, Thomas G.-
dc.contributor.authorKesselmeier, Jürgen-
dc.contributor.authorSaleska, Scott Reid-
dc.contributor.authorHuxman, Travis E.-
dc.date.accessioned2020-06-15T21:52:57Z-
dc.date.available2020-06-15T21:52:57Z-
dc.date.issued2011-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/18242-
dc.description.abstractThrough rapid reactions with ozone, which can initiate the formation of secondary organic aerosols, the emission of sesquiterpenes from vegetation in Amazonia may have significant impacts on tropospheric chemistry and climate. Little is known, however, about sesquiterpene emissions, transport, and chemistry within plant canopies owing to analytical difficulties stemming from very low ambient concentrations, high reactivities, and sampling losses. Here, we present ambient sesquiterpene concentration measurements obtained during the 2010 dry season within and above a primary tropical forest canopy in Amazonia. We show that by peaking at night instead of during the day, and near the ground instead of within the canopy, sesquiterpene concentrations followed a pattern different from that of monoterpenes, suggesting that unlike monoterpene emissions, which are mainly light dependent, sesquiterpene emissions are mainly temperature dependent. In addition, we observed that sesquiterpene concentrations were inversely related with ozone (with respect to time of day and vertical concentration), suggesting that ambient concentrations are highly sensitive to ozone. These conclusions are supported by experiments in a tropical rain forest mesocosm, where little atmospheric oxidation occurs and sesquiterpene and monoterpene concentrations followed similar diurnal patterns. We estimate that the daytime dry season ozone flux of -0.6 to -1.5 nmol m -2 s-1 due to in-canopy sesquiterpene reactivity could account for 7%-28% of the net ozone flux. Our study provides experimental evidence that a large fraction of total plant sesquiterpene emissions (46%-61% by mass) undergo within-canopy ozonolysis, which may benefit plants by reducing ozone uptake and its associated oxidative damage. © 2011 by the American Geophysical Union.en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 116, Número 19pt_BR
dc.rightsRestrito*
dc.subjectChemical Analysisen
dc.subjectDroughten
dc.subjectForestryen
dc.subjectOlefinsen
dc.subjectAmazoniaen
dc.subjectAmbient Concentrationsen
dc.subjectAtmospheric Oxidationen
dc.subjectConcentration Measurementen
dc.subjectDiurnal Patternen
dc.subjectDry Seasonsen
dc.subjectExperimental Evidenceen
dc.subjectHigh Reactivityen
dc.subjectHighly Sensitiveen
dc.subjectMesocosmsen
dc.subjectMonoterpene Emissionsen
dc.subjectMonoterpenesen
dc.subjectOxidative Damageen
dc.subjectOzone Fluxen
dc.subjectOzone Uptakeen
dc.subjectOzonolysisen
dc.subjectPlant Canopiesen
dc.subjectRapid Reactionsen
dc.subjectSecondary Organic Aerosolsen
dc.subjectSesquiterpenesen
dc.subjectSignificant Impactsen
dc.subjectTemperature Dependenten
dc.subjectTime Of Dayen
dc.subjectTropical Foresten
dc.subjectTropical Rain Foresten
dc.subjectTropospheric Chemistryen
dc.subjectOzoneen
dc.subjectAerosol Formationen
dc.subjectAir Samplingen
dc.subjectAmbient Airen
dc.subjectAtmospheric Chemistryen
dc.subjectBiogenic Emissionen
dc.subjectCanopy Exchangeen
dc.subjectExperimental Studyen
dc.subjectForest Canopyen
dc.subjectIsopreneen
dc.subjectMesocosmen
dc.subjectOxidationen
dc.subjectOzoneen
dc.subjectTemperature Effecten
dc.subjectTerpeneen
dc.subjectTroposphereen
dc.subjectAmazoniaen
dc.titleWithin-canopy sesquiterpene ozonolysis in Amazoniaen
dc.typeArtigopt_BR
dc.identifier.doi10.1029/2011JD016243-
dc.publisher.journalJournal of Geophysical Research Atmospherespt_BR
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