Efficient atmospheric cleansing of oxidized organic trace gases by vegetation

TitleEfficient atmospheric cleansing of oxidized organic trace gases by vegetation
Publication TypeJournal Article
Year of Publication2010
AuthorsKarl T., Harley P.C, Emmons L., Thornton B., Guenther A., Basu C., Turnipseed A., Jardine K.
JournalScience
Volume330
Issue6005
Pagination816 - 819
Date Published11/2010
KeywordsVOLATILE ORGANIC COMPOUNDS
Abstract

The biosphere is the major source and sink of nonmethane volatile organic compounds (VOCs) in the atmosphere. Gas-phase chemical reactions initiate the removal of these compounds from the atmosphere, which ultimately proceeds via deposition at the surface or direct oxidation to carbon monoxide or carbon dioxide. We performed ecosystem-scale flux measurements that show that the removal of oxygenated VOC via dry deposition is substantially larger than is currently assumed for deciduous ecosystems. Laboratory experiments indicate efficient enzymatic conversion and potential up-regulation of various stress-related genes, leading to enhanced uptake rates as a response to ozone and methyl vinyl ketone exposure or mechanical wounding. A revised scheme for the uptake of oxygenated VOCs, incorporated into a global chemistry-transport model, predicts appreciable regional changes in annual dry deposition fluxes.

DOI10.1126/science.1192534