PuSH - Publication Server of Helmholtz Zentrum München: Organic speciation of ambient quasi-ultrafine particulate matter (PM<sub>0.36</sub>) in Augsburg, Germany: Seasonal variability and source apportionment.

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Li, F. ; Schnelle-Kreis, J. ; Cyrys, J. ; Karg, E.W. ; Gu, J.* ; Abbaszade, G. ; Orasche, J. ; Peters, A. ; Zimmermann, R.

Organic speciation of ambient quasi-ultrafine particulate matter (PM_0.36) in Augsburg, Germany: Seasonal variability and source apportionment.

Sci. Total Environ. 615, 828-837 (2018)

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To investigate the organic composition and their sources of very fine atmospheric particulate matter (PM), size-segregated PM was sampled using rotating drum impactor (RDI) in series with a sequential filter sampler in Augsburg, Germany, from April 2014 to February 2015. Organic speciation analysis and organic carbon/elemental carbon (OC/EC) analysis was performed for the smallest size fraction PM 0.36 (PM < 360 nm). Different OC fractions were determined by thermal optical EC/OC analyzer, and OC2, OC3 and OC4 refer to OC fractions that were derived at 280, 480 and 580 °C, respectively. Positive matrix factorization (PMF) analysis was applied for source apportionment study. PMF resolved 5 sources including biogenic dominated secondary organic aerosol (bioSOA), isoprene dominated SOA (isoSOA), traffic, biomass burning (BB) and biomass burning originated SOA (bbSOA). On annual average, PMF results indicate the largest contribution of biogenic originated SOA (bioSOA plus isoSOA) to OC, followed by traffic and then BB related sources (BB plus bbSOA). Traffic was found to be associated with the smallest particles; whereas bioSOA and BB are associated with larger particles. Secondary organic marker compounds from biogenic precursors, OC2, OC3 and bioSOA, isoSOA source factors show summer maximum. Polycyclic aromatic hydrocarbons (PAHs), biomass burning markers, OC4 and BB, bbSOA source factors show winter maximum. Hopanes and the traffic source factor show little seasonal variation. Summer peaks of OC3 and OC2 are well modeled by PMF and are attributed mainly to biogenic SOA. OC4 was generally poorly modeled due to lack of characteristic low volatile markers. Summer maxima of biogenic SOA related compounds and source factors are positively correlated with temperature, global radiation, O 3 concentration and mixing layer height (MLH). Winter maxima of BB related compounds and source factors are negatively correlated with temperature and MLH; whereas positively correlated with NO 2 level.

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PuSH - Publication Server of Helmholtz Zentrum München

Organic speciation of ambient quasi-ultrafine particulate matter (PM0.36) in Augsburg, Germany: Seasonal variability and source apportionment.

Organic speciation of ambient quasi-ultrafine particulate matter (PM_0.36) in Augsburg, Germany: Seasonal variability and source apportionment.