Exploring sources of biogenic secondary organic aerosol compounds
using chemical analysis and the FLEXPART model
Johan Martinsson1,2, Guillaume Monteil3, Moa K. Sporre4, Anne Maria Kaldal Hansen5, Adam Kristensson1, Kristina Eriksson Stenström1, Erik Swietlicki1, and Marianne Glasius51Division of Nuclear Physics, Lund University, Box 118, SE-22100, Lund, Sweden 2Centre for Environmental and Climate Research, Lund University, Ecology Building, SE-22362, Lund, Sweden 3Department of Physical Geography, Lund University, Lund, Box 118, SE-22100, Lund, Sweden 4Department of Geosciences, University of Oslo, Postboks 1022, Blindern, 0315, Oslo, Norway 5Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, DK-8000, Aarhus C, Denmark
Received: 01 Feb 2017 – Accepted for review: 02 Feb 2017 – Discussion started: 08 Feb 2017
Abstract. Molecular tracers in secondary organic aerosols (SOA) can provide information on origin of SOA, as well as regional scale processes involved in their formation. In this study nine carboxylic acids, eleven organosulfates (OSs) and two nitrooxy organosulfates (NOSs) were determined in daily aerosol particle filter samples from Vavihill measurement station in southern Sweden during June and July 2012. Several of the observed compounds are photo-oxidation products from biogenic volatile organic compounds (BVOCs). Highest average mass concentrations were observed for carboxylic acids derived from fatty acids and monoterpenes (12.3±15.6 and 13.8±11.6 ng/m3, respectively). The FLEXPART model was used to link 9 specific surface types to single measured compounds. It was found that the surface category “sea and ocean” was dominating the air mass exposure (54 %) but contributed to low mass concentration of observed chemical compounds. A principal component (PC) analysis identified four components, where the one with highest explanatory power (49 %) displayed clear impact of coniferous forest on measured mass concentration of a majority of the compounds. The three remaining PC's were more difficult to interpret, although azelaic, suberic, and pimelic acid were closely related to each other but not to any clear surface category. Hence, future studies should aim to deduce the biogenic sources and surface category of these compounds. This study bridges micro level chemical speciation to air mass surface exposure on the macro level.
Martinsson, J., Monteil, G., Sporre, M. K., Kaldal Hansen, A. M., Kristensson, A., Eriksson Stenström, K., Swietlicki, E., and Glasius, M.: Exploring sources of biogenic secondary organic aerosol compounds
using chemical analysis and the FLEXPART model, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-90, in review, 2017.