Journal ArticleDOI
Aerosol chemical composition in cloud events by high resolution time-of-flight aerosol mass spectrometry.
Liqing Hao,Sami Romakkaniemi,Aki Kortelainen,A. Jaatinen,Harri Portin,Harri Portin,Pasi Miettinen,Mika Komppula,A. Leskinen,Annele Virtanen,James N. Smith,Donna Sueper,Douglas R. Worsnop,Douglas R. Worsnop,Kari E. J. Lehtinen,Kari E. J. Lehtinen,Ari Laaksonen,Ari Laaksonen +17 more
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TLDR
The results indicate a possible joint effect of activation ability of aerosol particles, cloud processing, and particle size effects on cloud formation.Abstract:
This study presents results of direct observations of aerosol chemical composition in clouds. A high-resolution time-of-flight aerosol mass spectrometer was used to make measurements of cloud interstitial particles (INT) and mixed cloud interstitial and droplet residual particles (TOT). The differences between these two are the cloud droplet residuals (RES). Positive matrix factorization analysis of high-resolution mass spectral data sets and theoretical calculations were performed to yield distributions of chemical composition of the INT and RES particles. We observed that less oxidized hydrocarbon-like organic aerosols (HOA) were mainly distributed into the INT particles, whereas more oxidized low-volatile oxygenated OA (LVOOA) mainly in the RES particles. Nitrates existed as organic nitrate and in chemical form of NH(4)NO(3). Organic nitrates accounted for 45% of total nitrates in the INT particles, in clear contrast to 26% in the RES particles. Meanwhile, sulfates coexist in forms of acidic NH(4)HSO(4) and neutralized (NH(4))(2)SO(4). Acidic sulfate made up 64.8% of total sulfates in the INT particles, much higher than 10.7% in the RES particles. The results indicate a possible joint effect of activation ability of aerosol particles, cloud processing, and particle size effects on cloud formation.read more
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Journal ArticleDOI
Organic aerosol components derived from 25 AMS data sets across Europe using a consistent ME-2 based source apportionment approach
Monica Crippa,Francesco Canonaco,V. A. Lanz,Mikko Äijälä,James Allan,Samara Carbone,Gerard Capes,Darius Ceburnis,Manuel Dall'Osto,Douglas A. Day,Peter F. DeCarlo,Peter F. DeCarlo,Mikael Ehn,Axel Eriksson,Evelyn Freney,L. Hildebrandt Ruiz,L. Hildebrandt Ruiz,Risto Hillamo,Jose L. Jimenez,Heikki Junninen,Astrid Kiendler-Scharr,A. Kortelainen,Markku Kulmala,Ari Laaksonen,Amewu A. Mensah,Amewu A. Mensah,Claudia Mohr,Claudia Mohr,Eiko Nemitz,Colin D. O'Dowd,Jurgita Ovadnevaite,Spyros N. Pandis,Tuukka Petäjä,Laurent Poulain,Sanna Saarikoski,Karine Sellegri,Erik Swietlicki,Petri Tiitta,D. R. Worsnop,Urs Baltensperger,André S. H. Prévôt +40 more
TL;DR: In this article, the authors focus on the identification of the main organic aerosol sources and define a standardized methodology to perform source apportionment using positive matrix factorization (PMF) with the multilinear engine (ME-2) on Aerodyne aerosol mass spectrometer (AMS) data.
Journal ArticleDOI
A review of observations of organic matter in fogs and clouds: Origin, processing and fate
TL;DR: In this paper, the authors reviewed the state of knowledge of atmospheric organic matter processing by fogs, with a focus on field observations, and discussed the occurrence of organic matter in fog, its solubility, characterization and molecular speciation.
Journal ArticleDOI
Elemental composition of organic aerosol: the gap between ambient and laboratory measurements
Qi Chen,Qi Chen,Colette L. Heald,Jose L. Jimenez,Manjula R. Canagaratna,Qi Zhang,Ling Yan He,Xiao Feng Huang,Pedro Campuzano-Jost,Brett B. Palm,Laurent Poulain,Mikinori Kuwata,Mikinori Kuwata,Scot T. Martin,Jonathan P. D. Abbatt,Alex K. Y. Lee,John Liggio +16 more
TL;DR: A large data set including surface, aircraft, and laboratory observations of the atomic oxygen-to-carbon (O:C) and hydrogen-tocarbon (H:C), ratios of organic aerosol (OA) is synthesized and corrected using a recently reported method as mentioned in this paper.
Journal ArticleDOI
Chemical Structural Characteristics of HULIS and Other Fractionated Organic Matter in Urban Aerosols: Results from Mass Spectral and FT-IR Analysis.
TL;DR: Water-insoluble organic Matter and water-soluble organic matter in the total suspended particulates collected in the city of Nagoya in summer/early autumn and winter were extracted using multiple solvents using mass spectrometry and Fourier transform infrared (FT-IR) spectroscopy.
Journal ArticleDOI
Uncertainty analysis in source apportionment of heavy metals in road dust based on positive matrix factorization model and geographic information system.
TL;DR: Based on 36 road dust samples from an urbanized area of Beijing in September 2016, the information about sources (types, proportions, and intensity in spatial) of heavy metals and uncertainties were analyzed using positive matrix factorization (PMF), bootstrap (BS), geographic information system (GIS) and Kriging.
References
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