Source characterization of highly oxidized multifunctional compounds in a boreal forest environment using positive matrix factorization

Show full item record



Permalink

http://hdl.handle.net/10138/168791

Citation

Yan , C , Nie , W , Äijälä , M , Rissanen , M P , Canagaratna , M R , Massoli , P , Junninen , H , Jokinen , T , Sarnela , N , Häme (o.s. Häkkinen) , S A K , Schobesberger , S , Canonaco , F , Yao , L , Prevot , A S H , Petäjä , T , Kulmala , M , Sipilä , M , Worsnop , D R & Ehn , M 2016 , ' Source characterization of highly oxidized multifunctional compounds in a boreal forest environment using positive matrix factorization ' , Atmospheric Chemistry and Physics , vol. 16 , no. 19 , pp. 12715-12731 . https://doi.org/10.5194/acp-16-12715-2016

Title: Source characterization of highly oxidized multifunctional compounds in a boreal forest environment using positive matrix factorization
Author: Yan, Chao; Nie, Wei; Äijälä, Mikko; Rissanen, Matti P.; Canagaratna, Manjula R.; Massoli, Paola; Junninen, Heikki; Jokinen, Tuija; Sarnela, Nina; Häme (o.s. Häkkinen), Silja A. K.; Schobesberger, Siegfried; Canonaco, Francesco; Yao, Lei; Prevot, Andre S. H.; Petäjä, Tuukka; Kulmala, Markku; Sipilä, Mikko; Worsnop, Douglas R.; Ehn, Mikael
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016-10-12
Language: eng
Number of pages: 17
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/168791
Abstract: Highly oxidized multifunctional compounds (HOMs) have been demonstrated to be important for atmospheric secondary organic aerosols (SOA) and new-particle formation (NPF), yet it remains unclear which the main atmospheric HOM formation pathways are. In this study, a nitrate-ion-based chemical ionization atmospheric-pressure-interface time-of-flight mass spectrometer (CI-APi-TOF) was deployed to measure HOMs in the boreal forest in Hyytiala, southern Finland. Positive matrix factorization (PMF) was applied to separate the detected HOM species into several factors, relating these "factors" to plausible formation pathways. PMF was performed with a revised error estimation derived from laboratory data, which agrees well with an estimate based on ambient data. Three factors explained the majority (> 95 %) of the data variation, but the optimal solution found six factors, including two night-time factors, three daytime factors, and a transport factor. One nighttime factor is almost identical to laboratory spectra generated from monoterpene ozonolysis, while the second likely represents monoterpene oxidation initiated by NO3. The exact chemical processes forming the different daytime factors remain unclear, but they all have clearly distinct diurnal profiles, very likely related to monoterpene oxidation with a strong influence from NO, presumably through its effect on peroxy radical (RO2 / chemistry. Apart from these five "local" factors, the sixth factor is interpreted as a transport related factor. These findings improve our understanding of HOM production by confirming current knowledge and inspiring future research directions and provide new perspectives on using factorization methods to understand short-lived atmospheric species.
Subject: SECONDARY ORGANIC AEROSOL
SOURCE APPORTIONMENT
MASS-SPECTROMETER
ATMOSPHERIC AEROSOL
PARTICLE FORMATION
SULFURIC-ACID
PRODUCTS
NUCLEATION
COMPONENTS
ORIGIN
114 Physical sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
acp_16_12715_2016.pdf 1.654Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record