Seasonal characteristics of organic aerosol chemical composition and volatility in Stuttgart, Germany
Wei Huang,Harald Saathoff,Xiaoli Shen,Ramakrishna Ramisetty,T. Leisner,T. Leisner,Claudia Mohr +6 more
TLDR
In this article, 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.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 high-resolution
time-of-flight aerosol mass spectrometer (HR-ToF-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-ToF-CIMS;
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 µ g m −3 ) than in the winter period ( 8.4±5.6 µ g m −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.read more
Citations
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Secondary Organic Aerosol Formation from Anthropogenic Air Pollution: Rapid and Higher than Expected
Jose L. Jimenez,Rainer Volkamer,F. M. San Martini,Katja Dzepina,Qi Zhang,Ingrid M. Ulbrich,D. Salcedo,D. R. Worsnop,Luisa T. Molina +8 more
TL;DR: This paper showed that reactive anthropogenic VOCs (AVOCs) produce much larger amounts of SOA than these models predict, even shortly after sunrise, and a significant fraction of the excess SOA is formed from first-generation AVOC oxidation products.
On the Evaporation Kinetics and Phase of Laboratory and Ambient Secondary Organic Aerosol
TL;DR: It is found that even when gas phase organics are removed, it takes ∼24 h for pure α-pinene SOA particles to evaporate 75% of their mass, which is in sharp contrast to the ∼10 min time scale predicted by current kinetic models.
Journal ArticleDOI
A review of aerosol chemistry in Asia: insights from aerosol mass spectrometer measurements
TL;DR: Aerosol composition varied largely in different regions, but was overall dominated by organic aerosols (OA, 32-75%), especially in south and southeast Asia due to the impact of biomass burning, and secondary OA was a ubiquitous and dominant aerosol component in all regions.
Journal ArticleDOI
Evaluating Organic Aerosol Sources and Evolution with a Combined Molecular Composition and Volatility Framework Using the Filter Inlet for Gases and Aerosols (FIGAERO).
Joel A. Thornton,Claudia Mohr,Siegfried Schobesberger,Emma L. D'Ambro,Ben H. Lee,Felipe D. Lopez-Hilfiker +5 more
TL;DR: Advances in the development and application of the Filter Inlet for Gases and Aerosols (FIGAERO) coupled to field-deployable High-Resolution Time-of-Flight Chemical Ionization Mass Spectrometers (HRToF-CIMS) are described.
Journal ArticleDOI
Organic aerosol volatility and viscosity in the North China Plain: contrast between summer and winter
Weiqi Xu,Chun Chen,Yanmei Qiu,Ying Li,Zhiqiang Zhang,Eleni Karnezi,Eleni Karnezi,Spyros N. Pandis,Conghui Xie,Zhijie Li,Jiaxing Sun,Nan Ma,Wanyun Xu,Pingqing Fu,Zifa Wang,Jiang Zhu,Douglas R. Worsnop,Nga L. Ng,Yele Sun +18 more
TL;DR: In this paper, a high-resolution aerosol mass spectrometer was used to investigate the volatility and viscosity of organic aerosol at a rural site (Gucheng) and an urban site (Beijing) in the North China Plain (NCP) in summer and winter.
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TL;DR: A unifying model framework describing the atmospheric evolution of OA that is constrained by high–time-resolution measurements of its composition, volatility, and oxidation state is presented, which can serve as a basis for improving parameterizations in regional and global models.
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Ubiquity and dominance of oxygenated species in organic aerosols in anthropogenically-influenced Northern Hemisphere midlatitudes
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TL;DR: In this article, organic aerosol data acquired by the AMS in 37 field campaigns were deconvolved into hydrocarbon-like OA (HOA) and several types of oxygenated OA components.
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