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| Titel |
Impact of the North Atlantic Oscillation on European aerosol ground levels through local processes: a seasonal model-based assessment using fixed anthropogenic emissions |
| VerfasserIn |
S. Jerez, P. Jiménez-Guerrero, J. P. Montávez, R. M. Trigo |
| 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 ; 13, no. 22 ; Nr. 13, no. 22 (2013-11-18), S.11195-11207 |
| Datensatznummer |
250085820
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| Publikation (Nr.) |
 copernicus.org/acp-13-11195-2013.pdf |
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| Zusammenfassung |
| The North Atlantic Oscillation (NAO) controls a large amount of the European
climate variability with asymmetric impacts in both time and space. Here we
investigate how the NAO impact on the local atmospheric processes
(disregarding the NAO impact on the large inter-continental transport
mechanisms) influences the levels of various aerosol species using simulated
data under constant emissions, which are fixed to the 2005 levels in order
to avoid anthropogenic-induced signals. In particular, we analyze
interannual variations at the seasonal timescale and focus on the
ground-level. The results show that positive NAO phases favor increased
aerosol concentrations in southern (northern) regions during winter (summer),
while negative NAO phases enhance them in northern (southern) regions during
winter (summer). The underlying processes are clearly related to the NAO
impact on precipitation and wind, as they act to clean the atmosphere
through removal and dispersion processes, and to the NAO impact on the
radiation balance (i.e., cloudiness) as it affects the biogenic emitting
activity and on the oxidative capacity of the atmosphere. Differences for
all the species studied (natural inert, secondary inorganic and organic
aerosols) are up to 5 μg m−3, reaching 10 and 20 μg m−3
for PM10 and PM2.5 respectively, which represents variations of about 20–40%
in their mean levels between opposite NAO phases. |
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