Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 19, Issue 9, Pages 5973-5991Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-19-5973-2019
Keywords
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Funding
- Swiss Federal Office of Environment
- Ostluft
- Swiss canton Basel
- Swiss canton Graubunden
- Swiss canton Thurgau
- Competence Center Environment and Sustainability (CCES) (project OPTIWARES)
- Swiss National Science Foundation (SNF, WOOSHI grant) [140590]
- SNF [P2EZP2_181599]
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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.
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