Trends in size classified particle number concentration in subtropical Brisbane, Australia, based on a 5 year study
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| Title: | Trends in size classified particle number concentration in subtropical Brisbane, Australia, based on a 5 year study |
|---|---|
| Authors: | Mejía, J.F.1, Wraith, D.2, Mengersen, K.2, Morawska, L.1 l.morawska@qut.edu.au |
| Source: | Atmospheric Environment. Feb2007, Vol. 41 Issue 5, p1064-1079. 16p. |
| Subjects: | Particulate matter, Particle size distribution, Emissions (Air pollution), Central business districts, Regression analysis |
| Geographic Terms: | Brisbane (Qld.), Australia |
| Abstract: | Particle number size distribution data in the range from 0. 015 to 0. 630μm were collected over a 5-year period in the central business district (CBD) of Brisbane, Australia. Particle size distribution was summarised by total number concentration and number median diameter (NMD) as well as the number concentration of the 0. 015–0. 030 (N 15–30), 0. 030–0. 050 (N 30–50), 0. 050–0. 100 (N 50–100), 0. 100–0. 300 (N 100–300) and 0. 300–0. 630 (N 300–630)μm size classes. Morning (6:00–10:00) and afternoon (16:00–19:00) measurements, the former representing fresh traffic emissions (based on the local meteorological conditions) and the latter well-mixed emissions from the CBD, during weekdays were extracted and the respective monthly mean values were estimated for time series analysis. For all size fractions, average morning concentrations were about 1. 5 higher than in the afternoon whereas NMD did not vary between the morning and afternoon. The trend and seasonal components were extracted through weighted linear regression models, using the monthly variance as weights. Only the morning measurements exhibited significant trends. During this time of the day, total particle number increased by 105. 7% and the increase was greater for larger particles, resulting in a shift in NMD by 7. 9%. Although no seasonal component was detected the evidence against it remained weak due to the limitations of the database. [Copyright &y& Elsevier] |
| Copyright of Atmospheric Environment is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 23556664 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Trends in size classified particle number concentration in subtropical Brisbane, Australia, based on a 5 year study – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mejía%2C+J%2EF%2E%22">Mejía, J.F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wraith%2C+D%2E%22">Wraith, D.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Mengersen%2C+K%2E%22">Mengersen, K.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Morawska%2C+L%2E%22">Morawska, L.</searchLink><relatesTo>1</relatesTo><i> l.morawska@qut.edu.au</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Atmospheric+Environment%22">Atmospheric Environment</searchLink>. Feb2007, Vol. 41 Issue 5, p1064-1079. 16p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Particulate+matter%22">Particulate matter</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Emissions+%28Air+pollution%29%22">Emissions (Air pollution)</searchLink><br /><searchLink fieldCode="DE" term="%22Central+business+districts%22">Central business districts</searchLink><br /><searchLink fieldCode="DE" term="%22Regression+analysis%22">Regression analysis</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Brisbane+%28Qld%2E%29%22">Brisbane (Qld.)</searchLink><br /><searchLink fieldCode="DE" term="%22Australia%22">Australia</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Particle number size distribution data in the range from 0. 015 to 0. 630μm were collected over a 5-year period in the central business district (CBD) of Brisbane, Australia. Particle size distribution was summarised by total number concentration and number median diameter (NMD) as well as the number concentration of the 0. 015–0. 030 (N 15–30), 0. 030–0. 050 (N 30–50), 0. 050–0. 100 (N 50–100), 0. 100–0. 300 (N 100–300) and 0. 300–0. 630 (N 300–630)μm size classes. Morning (6:00–10:00) and afternoon (16:00–19:00) measurements, the former representing fresh traffic emissions (based on the local meteorological conditions) and the latter well-mixed emissions from the CBD, during weekdays were extracted and the respective monthly mean values were estimated for time series analysis. For all size fractions, average morning concentrations were about 1. 5 higher than in the afternoon whereas NMD did not vary between the morning and afternoon. The trend and seasonal components were extracted through weighted linear regression models, using the monthly variance as weights. Only the morning measurements exhibited significant trends. During this time of the day, total particle number increased by 105. 7% and the increase was greater for larger particles, resulting in a shift in NMD by 7. 9%. Although no seasonal component was detected the evidence against it remained weak due to the limitations of the database. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Atmospheric Environment is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.atmosenv.2006.09.020 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1064 Subjects: – SubjectFull: Particulate matter Type: general – SubjectFull: Particle size distribution Type: general – SubjectFull: Emissions (Air pollution) Type: general – SubjectFull: Central business districts Type: general – SubjectFull: Regression analysis Type: general – SubjectFull: Brisbane (Qld.) Type: general – SubjectFull: Australia Type: general Titles: – TitleFull: Trends in size classified particle number concentration in subtropical Brisbane, Australia, based on a 5 year study Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mejía, J.F. – PersonEntity: Name: NameFull: Wraith, D. – PersonEntity: Name: NameFull: Mengersen, K. – PersonEntity: Name: NameFull: Morawska, L. IsPartOfRelationships: – BibEntity: Dates: – D: 11 M: 02 Text: Feb2007 Type: published Y: 2007 Identifiers: – Type: issn-print Value: 13522310 Numbering: – Type: volume Value: 41 – Type: issue Value: 5 Titles: – TitleFull: Atmospheric Environment Type: main |
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