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Erik Swietlicki. Foto.

Erik Swietlicki

Professor

Erik Swietlicki. Foto.

Exploring sources of biogenic secondary organic aerosol compounds using chemical analysis and the FLEXPART model

Författare

  • Johan Martinsson
  • Guillaume Monteil
  • Moa K. Sporre
  • Anne Maria Kaldal Hansen
  • Adam Kristensson
  • Kristina Eriksson Stenström
  • Erik Swietlicki
  • Marianne Glasius

Summary, in English

Molecular tracers in secondary organic aerosols (SOAs) can provide information on origin of SOA, as well as regional scale processes involved in their formation. In this study 9 carboxylic acids, 11 organosulfates (OSs) and 2 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 mg-3, respectively). The FLEXPART model was used to link nine specific surface types to single measured compounds. It was found that the surface category sea and ocean was dominating the air mass exposure (56 %) 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 PCs 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 at the macro level.

Avdelning/ar

  • Centrum för miljö- och klimatvetenskap (CEC)
  • Kärnfysik
  • Institutionen för naturgeografi och ekosystemvetenskap
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2017-09-18

Språk

Engelska

Sidor

11025-11040

Publikation/Tidskrift/Serie

Atmospheric Chemistry and Physics

Volym

17

Issue

18

Dokumenttyp

Artikel i tidskrift

Förlag

Copernicus GmbH

Ämne

  • Meteorology and Atmospheric Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1680-7316