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| Titel |
The role of long-range transport and domestic emissions in determining atmospheric secondary inorganic particle concentrations across the UK |
| VerfasserIn |
M. Vieno, M. R. Heal, S. Hallsworth, D. Famulari, R. M. Doherty, A. J. Dore, Y. S. Tang, C. F. Braban, D. Leaver, M. A. Sutton, S. Reis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 16 ; Nr. 14, no. 16 (2014-08-21), S.8435-8447 |
| Datensatznummer |
250118964
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| Publikation (Nr.) |
 copernicus.org/acp-14-8435-2014.pdf |
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| Zusammenfassung |
| Surface concentrations of secondary inorganic particle components over the
UK have been analysed for 2001–2010 using the EMEP4UK regional atmospheric
chemistry transport model and evaluated against measurements. Gas/particle
partitioning in the EMEP4UK model simulations used a bulk approach, which
may lead to uncertainties in simulated secondary inorganic aerosol. However,
model simulations were able to accurately represent both the long-term
decadal surface concentrations of particle sulfate and nitrate and an
episode in early 2003 of substantially elevated nitrate measured across the
UK by the AGANet network. The latter was identified as consisting of three
separate episodes, each of less than 1 month duration, in February, March
and April. The primary cause of the elevated nitrate levels across the UK
was meteorological: a persistent high-pressure system, whose varying
location impacted the relative importance of transboundary versus domestic
emissions. Whilst long-range transport dominated the elevated nitrate in
February, in contrast it was domestic emissions that mainly contributed to
the March episode, and for the April episode both domestic emissions and
long-range transport contributed. A prolonged episode such as the one in
early 2003 can have substantial impact on annual average concentrations. The
episode led to annual concentration differences at the regional scale of
similar magnitude to those driven by long-term changes in precursor
emissions over the full decade investigated here. The results demonstrate
that a substantial part of the UK, particularly the south and southeast,
may be close to or exceeding annual mean limit values because of import of
inorganic aerosol components from continental Europe under specific
conditions. The results reinforce the importance of employing multiple year
simulations in the assessment of emissions reduction scenarios on particulate matter
concentrations and the need for international agreements to address the
transboundary component of air pollution. |
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