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Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart, Germany

Huang, Wei; Saathoff, Harald; Shen, Xiaoli; Ramisetty, Ramakrishna; Leisner, Thomas; Mohr, Claudia

Abstract:
The chemical composition and volatility of organic aerosol (OA) particles were investigated during July–August 2017 and February–March 2018 in the city of Stuttgart, one of the most polluted cities in Germany. Total non-refractory particle mass was measured with a highresolution time-of-flight aerosol mass spectrometer (HRToF-AMS; hereafter AMS). Aerosol particles were collected on filters and analyzed in the laboratory with a filter inlet for gases and aerosols coupled to a high-resolution time-of-flight chemical ionization mass spectrometer (FIGAERO-HR-ToFCIMS; hereafter CIMS), yielding the molecular composition of oxygenated OA (OOA) compounds. While the average organic mass loadings are lower in the summer period (5.1 ± 3.2 μgm¯³) than in the winter period (8.4 ±5.6 μgm¯³), we find relatively larger mass contributions of organics measured by AMS in summer (68.8 ±13.4 %) compared to winter (34.8 ±9.5 %). CIMS mass spectra show OOA compounds in summer have O: C of 0.82 ±0.02 and are more influenced by biogenic emissions, while OOA compounds in winter have O:C of 0.89 ±0.06 and are more influenced by biomass burning emissions. Volatility parametrization analysis shows that OOA in winter is less volatile with higher contributions of low-volatility organic compounds (LVOCs) and extremely low-volatility organic compounds (ELVOCs). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000098717
Veröffentlicht am 07.10.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000098717
HGF-Programm 12.03.03 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 19
Heft 18
Seiten 11687–11700
Vorab online veröffentlicht am 19.09.2019
Nachgewiesen in Scopus
Web of Science
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