Application of synoptic weather typing to an investigation of Nocturnal ozone concentration at a maritime location, New Zealand

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Show simple item record Khan, Basit en De Freitas, CR en Shooter, D en 2012-03-13T01:16:21Z en 2007 en
dc.identifier.citation ATMOSPHERIC ENVIRONMENT 41(27):5636-5646 01 Sep 2007 en
dc.identifier.issn 1352-2310 en
dc.identifier.uri en
dc.description.abstract Relationships between weather types and the air pollutants ozone (O3 ) and nitrogen oxides ðNOxÞ at night are explored through the analysis of two years of data from the east coast of the Auckland urban area. Principal component analysis is used to identify synoptic classes and corresponding weather types, while principal component regression is used to assess relationships between these and O3 and NOx ðNO þ NO2Þ concentrations. Three synoptic classes (labelled cyclonic, anticyclonic and intermediate) consisting of seven discrete weather types were identified. Anticyclonic and cyclonic synoptic conditions were strong determinants of O3 and NOx concentrations. The intermediate class was the most persistent but had less significant effect on O3 and NOx concentrations. In cyclonic conditions, NOx was low due to increased ventilation. NOx concentration under anticyclonic conditions with cold and relatively dry air from Auckland urban areas was large, while that of O3 was generally small, as O3 is efficiently removed as a result of chemical titration with NO in the stable boundary layer. Under these conditions O3 can also be expected to be removed by dry deposition and NOx removed by the heterogeneous hydrolysis of dinitrogen pentoxide (N2O5 ). In cyclonic conditions and during times when winds from over the ocean prevailed, the concentration of O3 was relatively high, apparently due to a very weak O3 titration reaction and intrusion of regional-scale background O3. Temperature and humidity had no significant effect on nocturnal O3 , while both affected NO2 concentrations. en
dc.publisher Elsevier en
dc.relation.ispartofseries Atmospheric Environment en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from en
dc.rights.uri en
dc.title Application of synoptic weather typing to an investigation of Nocturnal ozone concentration at a maritime location, New Zealand en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.atmosenv.2007.02.040 en
pubs.begin-page 5636 en
pubs.volume 41 en
dc.rights.holder Copyright: Elsevier en
pubs.end-page 5646 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 68914 en
pubs.record-created-at-source-date 2010-09-01 en

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