Anthropogenic and Biogenic Influence on VOC Fluxes at an Urban
Atmos. Chem. Phys., 16, 7981–8007, 2016 www.atmos-chem-phys.net/16/7981/2016/ doi:10.5194/acp-16-7981-2016 © Author(s) 2016. CC Attribution 3.0 License. Anthropogenic and biogenic influence on VOC fluxes at an urban background site in Helsinki, Finland Pekka Rantala1, Leena Järvi1, Risto Taipale1, Terhi K. Laurila1, Johanna Patokoski1, Maija K. Kajos1, Mona Kurppa1, Sami Haapanala1, Erkki Siivola1, Tuukka Petäjä1, Taina M. Ruuskanen1, and Janne Rinne1,2,3,4 1Department of Physics, University of Helsinki, Helsinki, Finland 2Department of Geoscience and Geography, University of Helsinki, Helsinki, Finland 3Finnish Meteorological Institute, Helsinki, Finland 4Department of Physical Geography and Ecosystems Science, Lund University, Lund, Sweden Correspondence to: Pekka Rantala (pekka.a.rantala@helsinki.fi) Received: 22 December 2015 – Published in Atmos. Chem. Phys. Discuss.: 15 February 2016 Revised: 31 May 2016 – Accepted: 4 June 2016 – Published: 1 July 2016 Abstract. We measured volatile organic compounds 1 Introduction (VOCs), carbon dioxide (CO2) and carbon monoxide (CO) at an urban background site near the city centre of Helsinki, Micrometeorological flux measurements of volatile organic Finland, northern Europe. The VOC and CO2 measurements compounds (VOCs) in urban and semi-urban areas are were obtained between January 2013 and September 2014 limited, although local emissions have a major effect on whereas for CO a shorter measurement campaign in April– the local and regional atmospheric chemistry and further- May 2014 was conducted. Both anthropogenic and biogenic more on air quality (e.g. Reimann and Lewis, 2007 and sources were identified for VOCs in the study. Strong correla- references therein). Biogenic VOCs, mainly isoprene and tions between VOC fluxes and CO fluxes and traffic rates in- monoterpenes, affect hydroxyl radical (OH) concentration dicated anthropogenic source of many VOCs.
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