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An investigation of nucleation events in a coastal urban environment in the southern hemisphere

Mejia, Jaime F. & Morawska, Lidia (2009) An investigation of nucleation events in a coastal urban environment in the southern hemisphere. Atmospheric Chemistry and Physics Discussions, 9(1), pp. 2195-2222.

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Abstract

The occurrence of and conditions favourable to nucleation were investigated at an industrial and commercial coastal location in Brisbane, Australia during five different campaigns covering a total period of 13 months. To identify potential nucleation events, the difference in number concentration in the size range 14-30 nm (N14-30) between consecutive observations was calculated using first-order differencing. The data showed that nucleation events were a rare occurrence, and that in the absence of nucleation the particle number was dominated by particles in the range 30-300 nm. In many instances, total particle concentration declined during nucleation. There was no clear pattern in change in NO and NO2 concentrations during the events. SO2 concentration, in the majority of cases, declined during nucleation but there were exceptions. Most events took place in summer, followed by winter and then spring, and no events were observed for the autumn campaigns. The events were associated with sea breeze and long-range transport. Roadside emissions, in contrast, did not contribute to nucleation, probably due to the predominance of particles in the range 50-100 nm associated with these emissions.

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ID Code: 25829
Item Type: Journal Article
Additional Information: The contents of this journal can be freely accessed online via the journal’s web page (see Official URL).
Additional URLs:
Keywords: nucleation, particle number, wind sector, N14-30
ISSN: 1680-7367
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Sciences not elsewhere classified (040199)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > OTHER CHEMICAL SCIENCES (039900) > Environmental Chemistry (incl. Atmospheric Chemistry) (039901)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Aerosols (040101)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2009 [please consult the authors]
Deposited On: 19 Jun 2009 13:36
Last Modified: 09 Jun 2010 23:50

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