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Proc Natl Acad Sci U S A

Title:		Urban flux measurements reveal a large pool of oxygenated volatile organic compound emissions
Author(s):		Karl T; Striednig M; Graus M; Hammerle A; Wohlfahrt G;
Address:		"Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, 6020 Innsbruck, Austria; thomas.karl@uibk.ac.at. Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, 6020 Innsbruck, Austria. Institute of Ecology, University of Innsbruck, 6020 Innsbruck, Austria"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2018
Volume:		20180122
Issue:		6
Page Number:		1186 - 1191
DOI:		10.1073/pnas.1714715115
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
Abstract:		"Atmospheric chemistry is fueled by a large annual influx of nonmethane volatile organic compounds (NMVOC). These compounds influence ozone formation, lead to secondary organic aerosol production, and play a significant role for the oxidizing capacity of the atmosphere. The anthropogenic NMVOC budget is considerably uncertain due to the diversity of urban emission sources. Here, we present comprehensive observations of urban NMVOC eddy covariance fluxes using a newly designed proton-transfer-reaction quadrupole interface time-of-flight mass spectrometer. We found emission fluxes of a surprisingly large pool of oxygenated NMVOCs (OVOCs) with an appreciable fraction of higher oxidized OVOCs that cannot be explained by known fast photochemical turnaround or current primary emission estimates. Measured OVOC/NMVOC bulk flux ratios are two to four times higher than inferred from aggregated anthropogenic emission inventories. Extrapolating these results would double the global anthropogenic NMVOC flux. In view of globally accelerating urbanization, our study highlights the need to reevaluate the influence of anthropogenic NMVOC on atmospheric chemistry, human health, and the climate system"
Keywords:		Nmvoc air pollution eddy covariance mass spectrometry urban emissions;
Notes:		"PubMed-not-MEDLINEKarl, T Striednig, M Graus, M Hammerle, A Wohlfahrt, G eng Research Support, Non-U.S. Gov't 2018/01/24 Proc Natl Acad Sci U S A. 2018 Feb 6; 115(6):1186-1191. doi: 10.1073/pnas.1714715115. Epub 2018 Jan 22"