dc.contributor.author |
Jiang, Ningbo |
en |
dc.contributor.author |
Hay, John E. |
en |
dc.contributor.author |
Fisher, Gavin W. |
en |
dc.date.accessioned |
2007-09-11T20:54:05Z |
en |
dc.date.available |
2007-09-11T20:54:05Z |
en |
dc.date.issued |
2005 |
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dc.identifier.citation |
Jiang, N., Hay, J.E., Fisher, G.W., 2005. Synoptic weather patterns and morning rush hour nitrogen oxides concentrations during Auckland winters. Weather and Climate, 25, 43-69. |
en |
dc.identifier.issn |
0111-5499 |
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dc.identifier.uri |
http://hdl.handle.net/2292/1863 |
en |
dc.description |
A companion paper of
1) Jiang, N., Hay, J.E., Fisher, G.W., 2005. Effects of meteorological conditions on concentrations of nitrogen oxides in Auckland. Weather and Climate, 24, 15-34.
2) Jiang, N., Hay, J.E., Fisher, G.W., 2004. Classification of New Zealand synoptic weather types and relation to the Southern Oscillation Index. Weather and Climate, 23, 3-23. |
en |
dc.description.abstract |
A synoptic climatological approach is applied to the study of weather air
quality relationships in Auckland. Ten synoptic weather types are identified
using a new, two-stage classification scheme that consists of obliquely
rotated T-mode principal component analysis (PCA) followed by K-means
clustering via Varimax rotated S-mode PCA. The weather types are analysed
in relation to local meteorology, and to nitrogen oxides concentrations
at two monitoring sites. Two anticyclonic weather types, characterised by
calm, cold and relatively humid morning rush hour local conditions, are
related to both high regional pollution and severe pollution episodes.
Weather types associated with strong and persistent local westsouthwesterly
winds help maintain good regional air quality due to enhanced
ventilation. Under unstable cyclonic synoptic types, characterized
by moderate to strong northerly winds, warm, humid, cloudy and rainy local
conditions, emissions from the Auckland Central Business District can have
significant air quality impacts on downwind residential areas. It is also
suggested that the synoptic determinants of solar radiation intensities as
well as temperatures appear important in controlling morning rush hour
nitrogen oxides conversion chemistry. The weather type-air quality relationships
vary to some extent from site to site due to the coupling of local
meteorology and spatial variations in major emission sources. The findings
demonstrate that the weather typing approach is not only capable of
reflecting the effects of conditions associated with both emissions and local
meteorology, but also provides an integrated evaluation of the impacts of
synoptic circulation on both regional meteorology and air quality. |
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dc.description.sponsorship |
The University of Auckland |
en |
dc.publisher |
Weather and Climate, Meteorological Society of New Zealand |
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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. |
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dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.subject |
synoptic climatology |
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dc.subject |
t-mode principal component analysis |
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dc.subject |
k-means clustering |
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dc.subject |
rush hour |
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dc.subject |
nitrogen oxides |
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dc.subject |
air quality |
en |
dc.title |
Synoptic weather types and morning rush hour nitrogen oxides concentrations during Auckland winters |
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dc.type |
Journal Article |
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dc.subject.marsden |
Fields of Research::260000 Earth Sciences |
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dc.subject.marsden |
Fields of Research::300000 Agricultural, Veterinary and Environmental Sciences |
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dc.subject.marsden |
Fields of Research::230000 Mathematical Sciences::230200 Statistics |
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dc.subject.marsden |
Fields of Research::250000 Chemical Sciences::259900 Other Chemical Sciences::259902 Environmental chemistry (incl. atmospheric chemistry) |
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dc.description.version |
VoR - Version of Record |
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dc.rights.holder |
Copyright: New Zealand Meteorological Society |
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dc.rights.accessrights |
http://purl.org/eprint/accessRights/OpenAccess |
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