| Title: | Efficient atmospheric cleansing of oxidized organic trace gases by vegetation |
| Author(s): | Karl T; Harley P; Emmons L; Thornton B; Guenther A; Basu C; Turnipseed A; Jardine K; |
| Address: | "National Center for Atmospheric Research, Boulder, CO 80301, USA. tomkarl@ucar.edu" |
| ISSN/ISBN: | 1095-9203 (Electronic) 0036-8075 (Linking) |
| 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" |
| Keywords: | "Atmosphere/*chemistry *Ecosystem Gene Expression Regulation, Plant Oxidation-Reduction Plant Leaves/*metabolism Plants/genetics/*metabolism Populus/genetics/metabolism Stress, Physiological Trees/*metabolism Tropical Climate Up-Regulation Volatile Organic;" |
| Notes: | "MedlineKarl, T Harley, P Emmons, L Thornton, B Guenther, A Basu, C Turnipseed, A Jardine, K eng Research Support, U.S. Gov't, Non-P.H.S. 2010/10/23 Science. 2010 Nov 5; 330(6005):816-9. doi: 10.1126/science.1192534. Epub 2010 Oct 21" |
