Impact of anthropogenic and biogenic sources on the seasonal variation in the molecular composition of urban organic aerosols : a field and laboratory study using ultra-high-resolution mass spectrometry

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Dällenbach , K , Kourtchev , I , Vogel , A L , Bruns , E A , Jiang , J , Petäjä , T , Jaffrezo , J-L , Aksoyoglu , S , Kalberer , M , Baltensperger , U , El Haddad , I & Prevot , A S H 2019 , ' Impact of anthropogenic and biogenic sources on the seasonal variation in the molecular composition of urban organic aerosols : a field and laboratory study using ultra-high-resolution mass spectrometry ' , Atmospheric Chemistry and Physics , vol. 19 , no. 9 , pp. 5973-5991 . https://doi.org/10.5194/acp-19-5973-2019

Title: Impact of anthropogenic and biogenic sources on the seasonal variation in the molecular composition of urban organic aerosols : a field and laboratory study using ultra-high-resolution mass spectrometry
Author: Dällenbach, Kaspar; Kourtchev, Ivan; Vogel, Alexander L.; Bruns, Emily A.; Jiang, Jianhui; Petäjä, Tuukka; Jaffrezo, Jean-Luc; Aksoyoglu, Sebnem; Kalberer, Markus; Baltensperger, Urs; El Haddad, Imad; Prevot, Andre S. H.
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2019-05-07
Language: eng
Number of pages: 19
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/302043
Abstract: This study presents the molecular composition of organic aerosol (OA) using ultra-high-resolution mass spectrometry (Orbitrap) at an urban site in Central Europe (Zurich, Switzerland). Specific source spectra were also analysed, including samples representative of woodburning emissions from Alpine valleys during wood-burning pollution episodes and smog chamber investigations of woodsmoke, as well as samples from Hyytiala, which were strongly influenced by biogenic secondary organic aerosol. While samples collected during winter in Alpine valleys have a molecular composition remarkably similar to fresh laboratory wood-burning emissions, winter samples from Zurich are influenced by more aged wood-burning emissions. In addition, other organic aerosol emissions or formation pathways seem to be important at the latter location in winter. Samples from Zurich during summer are similar to those collected in Hyytiala and are predominantly impacted by oxygenated compounds with an H/C ratio of 1.5, indicating the importance of biogenic precursors for secondary organic aerosol (SOA) formation at this location (summertime Zurich - carbon number 7.6, O : C 0.7; Hyytiala - carbon number 10.5, O : C 0.57). We could explain the strong seasonality of the molecular composition at a typical European site by primary and aged wood-burning emissions and biogenic secondary organic aerosol formation during winter and summer, respectively. Results presented here likely explain the rather constant seasonal predominance of non-fossil organic carbon at European locations.
Subject: 1172 Environmental sciences
116 Chemical sciences
AIR-POLLUTION SOURCES
SOURCE APPORTIONMENT
CARBONACEOUS AEROSOLS
ELECTROSPRAY-IONIZATION
OFFLINE-AMS
ELEMENTAL CARBON
NITRATED PHENOLS
CENTRAL-EUROPE
EMISSIONS
COMBUSTION
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