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Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Receptor modeling of C2-C7 hydrocarbon sources at an urban background site in Zurich, Switzerland : changes between 1993-1994 and 2005-2006
Authors:	Lanz, Valentin A. Hueglin, Christoph Buchmann, Brigitte Hill, M. Locher, René Stähelin, Johannes Reimann, Stefan
DOI:	10.21256/zhaw-2759
Published in:	Atmospheric Chemistry and Physics
Volume(Issue):	2008
Issue:	8
Page(s):	2313
Pages to:	2332
Issue Date:	2008
Publisher / Ed. Institution:	Copernicus
ISSN:	1680-7316 1680-7324
Language:	English
Subjects:	Air quality; Linear unmixing; Multivariate analysis; Regression
Subject (DDC):	540: Chemistry
Abstract:	Hourly measurements of 13 volatile hydrocarbons (C2-C7) were performed at an urban background site in Zurich (Switzerland) in the years 1993-1994 and again in 2005-2006. For the separation of the volatile organic compounds by gas-chromatography (GC), an identical chromatographic column was used in both campaigns. Changes in hydrocarbon profiles and source strengths were recovered by positive matrix factorization (PMF). Eight and six factors could be related to hydrocarbon sources in 1993-1994 and in 2005-2006, respectively. The modeled source profiles were verified by hydrocarbon profiles reported in the literature. The source strengths were validated by independent measurements, such as inorganic trace gases (NOx, CO, SO2), methane (CH4), oxidized hydrocarbons (OVOCs) and meteorological data (temperature, wind speed etc.). Our analysis suggests that the contribution of most hydrocarbon sources (i.e. road traffic, solvents use and wood burning) decreased by a factor of about two to three between the early 1990s and 2005?2006. On the other hand, hydrocarbon losses from natural gas leakage remained at relatively constant levels (-20%). The estimated emission trends are in line with the results from different receptor-based approaches reported for other European cities. Their differences to national emission inventories are discussed.
URI:	https://digitalcollection.zhaw.ch/handle/11475/14089
Fulltext version:	Published version
License (according to publishing contract):	CC BY 3.0: Attribution 3.0 Unported
Departement:	School of Engineering
Organisational Unit:	Institute of Data Analysis and Process Design (IDP)
Appears in collections:	Publikationen School of Engineering

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