Estimates of the organic aerosol volatility in a boreal forest using two independent methods

Show simple item record Hong, Juan Äijälä, Mikko Häme , Silja A. K. Hao, Liqing Duplissy, Jonathan Heikkinen, Liine M. Nie, Wei Mikkilä, Jyri Kulmala, Markku Prisle, Nonne L. Virtanen, Annele Ehn, Mikael Paasonen, Pauli Worsnop, Douglas R. Riipinen, Ilona Petäjä, Tuukka Kerminen, Veli-Matti 2017-04-24T10:16:01Z 2017-04-24T10:16:01Z 2017-03-31
dc.identifier.citation Hong , J , Äijälä , M , Häme , S A K , Hao , L , Duplissy , J , Heikkinen , L M , Nie , W , Mikkilä , J , Kulmala , M , Prisle , N L , Virtanen , A , Ehn , M , Paasonen , P , Worsnop , D R , Riipinen , I , Petäjä , T & Kerminen , V-M 2017 , ' Estimates of the organic aerosol volatility in a boreal forest using two independent methods ' , Atmospheric Chemistry and Physics , vol. 17 , no. 6 , pp. 4387-4399 .
dc.identifier.other PURE: 83259256
dc.identifier.other PURE UUID: cd8527f9-7676-4cc6-942d-0ed58a7be49a
dc.identifier.other WOS: 000397942500002
dc.identifier.other Scopus: 85016960285
dc.identifier.other ORCID: /0000-0002-4625-9590/work/32279096
dc.identifier.other ORCID: /0000-0001-7837-967X/work/39131160
dc.identifier.other ORCID: /0000-0002-1881-9044/work/102822888
dc.description.abstract The volatility distribution of secondary organic aerosols that formed and had undergone aging - i. e., the particle mass fractions of semi-volatile, low-volatility and extremely low volatility organic compounds in the particle phase - was characterized in a boreal forest environment of Hyytiala, southern Finland. This was done by interpreting field measurements using a volatility tandem differential mobility analyzer (VTDMA) with a kinetic evaporation model. The field measurements were performed during April and May 2014. On average, 40% of the organics in particles were semi-volatile, 34% were low-volatility organics and 26% were extremely low volatility organics. The model was, however, very sensitive to the vaporization enthalpies assumed for the organics (Delta H-VAP). The best agreement between the observed and modeled temperature dependence of the evaporation was obtained when effective vaporization enthalpy values of 80 kJ mol(-1) were assumed. There are several potential reasons for the low effective enthalpy value, including molecular decomposition or dissociation that might occur in the particle phase upon heating, mixture effects and compound-dependent uncertainties in the mass accommodation coefficient. In addition to the VTDMA-based analysis, semi-volatile and low-volatility organic mass fractions were independently determined by applying positive matrix factorization (PMF) to high-resolution aerosol mass spectrometer (HR-AMS) data. The factor separation was based on the oxygenation levels of organics, specifically the relative abundance of mass ions at m/z 43 (f43) and m/z 44 (f44). The mass fractions of these two organic groups were compared against the VTDMA-based results. In general, the best agreement between the VTDMA results and the PMF-derived mass fractions of organics was obtained when Delta H-VAP D 80 kJ mol(-1) was set for all organic groups in the model, with a linear correlation coefficient of around 0.4. However, this still indicates that only about 16% (R-2)of the variation can be explained by the linear regression between the results from these two methods. The prospect of determining of extremely low volatility organic aerosols (ELVOAs) from AMS data using the PMF analysis should be assessed in future studies. en
dc.format.extent 13
dc.language.iso eng
dc.relation.ispartof Atmospheric Chemistry and Physics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject TIME SCALES
dc.subject SECONDARY
dc.subject PARTICLES
dc.subject ATMOSPHERE
dc.subject COMPONENTS
dc.subject 114 Physical sciences
dc.title Estimates of the organic aerosol volatility in a boreal forest using two independent methods en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Aerosol-Cloud-Climate -Interactions (ACCI)
dc.contributor.organization Helsinki Institute of Physics
dc.contributor.organization Polar and arctic atmospheric research (PANDA)
dc.description.reviewstatus Peer reviewed
dc.relation.issn 1680-7316
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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