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DOI	10.5194/acp-19-11687-2019
	Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart; Germany
	Huang W.; Saathoff H.; Shen X.; Ramisetty R.; Leisner T.; Mohr C.
发表日期	2019
ISSN	16807316
起始页码	11687
结束页码	11700
卷号	19 期号:18
英文摘要	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). We partially explain this by the higher contributions of compounds with shorter carbon chain lengths and a higher number of oxygen atoms, i.e., higher O:C in winter. Organic compounds desorbing from the particles deposited on the filter samples also exhibit a shift of signal to higher desorption temperatures (i.e., lower apparent volatility) in winter. This is consistent with the relatively higher O: C in winter but may also be related to higher particle viscosity due to the higher contributions of larger-molecular-weight LVOCs and ELVOCs, interactions between different species and/or particles (particle matrix), and/or thermal decomposition of larger molecules. The results suggest that whereas lower temperature in winter may lead to increased partitioning of semi-volatile organic compounds (SVOCs) into the particle phase, this does not result in a higher overall volatility of OOA in winter and that the difference in sources and/or chemistry between the seasons plays a more important role. Our study provides insights into the seasonal variation of the molecular composition and volatility of ambient OA particles and into their potential sources. © Author(s) 2019.
语种	英语
scopus关键词	aerosol composition; biomass burning; mass spectrometry; molecular analysis; parameterization; seasonal variation; urban atmosphere; volatile organic compound; Baden-Wurttemberg; Germany; Stuttgart [Baden-Wurttemberg]
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144147
作者单位	Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, 76344, Germany; Institute of Geography and Geoecology, Working Group for Environmental Mineralogy and Environmental System Analysis, Karlsruhe Institute of Technology, Karlsruhe, 76131, Germany; Institute of Environmental Physics, Heidelberg University, Heidelberg, 69120, Germany; Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 11418, Sweden; TSI Instruments India Private Limited, Bangalore, 560102, India
推荐引用方式 GB/T 7714	Huang W.,Saathoff H.,Shen X.,et al. Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart; Germany[J],2019,19(18).
APA	Huang W.,Saathoff H.,Shen X.,Ramisetty R.,Leisner T.,&Mohr C..(2019).Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart; Germany.Atmospheric Chemistry and Physics,19(18).
MLA	Huang W.,et al."Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart; Germany".Atmospheric Chemistry and Physics 19.18(2019).