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  • Jardine, K. (author)

Within-canopy sesquiterpene ozonolysis in Amazonia

  • Article/chapterEnglish2011

Publisher, publication year, extent ...

  • 2011

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:265aa39a-a197-436b-b01e-7ee7c041ed40
  • https://lup.lub.lu.se/record/2179392URI
  • https://doi.org/10.1029/2011JD016243DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Through 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Serrano, Yanez (author)
  • Arneth, AlmutLund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science(Swepub:lu)nate-aar (author)
  • Abrell, L. (author)
  • Jardine, A. (author)
  • van Haren, J. (author)
  • Artaxo, P. (author)
  • Rizzo, L. V. (author)
  • Ishida, F. Y. (author)
  • Karl, T. (author)
  • Kesselmeier, J. (author)
  • Saleska, S. (author)
  • Huxman, T. (author)
  • Institutionen för naturgeografi och ekosystemvetenskapNaturvetenskapliga fakulteten (creator_code:org_t)

Related titles

  • In:Journal of Geophysical Research1162156-2202

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