Document Details
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Document Type |
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Article In Journal |
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Document Title |
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Urban organic aerosols measured by single particle mass spectrometry in the megacity of London العوالق الهوائية العضوية في المناطق الحضرية التي تم قياسها بالمطياف الكتلي أحادي الجسيم في لندن الكبرى |
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Subject |
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Enviromental sciences |
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Document Language |
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English |
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Abstract |
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During the month of October 2006, as part of the REPARTEE-I experiment (Regent’s
Park and Tower Environmental Experiment) an Aerosol Time-Of-Flight Mass Spectrometer
(ATOFMS) was deployed at an urban background location in the city of London,
5 UK. Fifteen particle types were classified, some of which were accompanied by Aerosol
Mass Spectrometer (AMS) quantitative aerosol mass loading measurements (Dall’Osto
et al., 2009a, b). In this manuscript the origins and properties of four particle types associated
with locally generated aerosols, independent of the air mass type advected
into London, are examined. One particle type, originating from lubricating oil (referred
10 to as Ca-EC), was associated with morning rush hour traffic emissions. A second particle
type, composed of both inorganic and organic species (called Na-EC-OC), was
found enhanced in particle number concentration during evening time periods, and is
likely to originate from a source operating at this time of day, or more probably from
condensation of semi-volatile species, and contains both primary and secondary com15
ponents. A third class, internally mixed with organic carbon and sulphate (called OC),
was found to spike both in the morning and evenings. The fourth class (SOA-PAH) exhibited
maximum frequency during the warmest part of the day, and a number of factors
point towards secondary production from traffic-related volatile aromatic compounds.
Single particle mass spectra of this particle type showed an oxidized polycyclic aro20
matic compound signature. Finally, a comparison of ATOFMS particle class data is
made with factors obtained by Positive Matrix Factorization from AMS data.. Both the
Ca-EC and OC particle types correlate with the AMS HOA primary organic fraction
(R2 =0.65 and 0.50 respectively), and Na-EC-OC, but not SOA-PAH, which correlates
weakly with the AMS OOA secondary organic aerosol factor (R2 = 0.35). A detailed
25 analysis was conducted to identify ATOFMS particle type(s) representative of the AMS
COA cooking aerosol factor, but no convincing associations were found. |
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ISSN |
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1680-7316 |
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Journal Name |
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Atmospheric Chemistry and Physics |
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Volume |
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12 |
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Issue Number |
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9 |
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Publishing Year |
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1433 AH
2012 AD |
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Article Type |
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Article |
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Added Date |
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Sunday, September 16, 2012 |
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Researchers
| M. Dall’Osto | Dall’Osto, M. | Researcher | | r.m.harrison@bham.ac.uk |
| R. M. Harrison | Harrison, R. M. | Researcher | | |
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Files
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single particle mass spectrometry in the
megacity of London |
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