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| Titel |
Arctic aerosol life cycle: linking aerosol size distributions observed between 2000 and 2010 with air mass transport and precipitation at Zeppelin station, Ny-Ålesund, Svalbard |
| VerfasserIn |
P. Tunved, J. Ström, R. Krejci |
| 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. 7 ; Nr. 13, no. 7 (2013-04-02), S.3643-3660 |
| Datensatznummer |
250018569
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| Publikation (Nr.) |
 copernicus.org/acp-13-3643-2013.pdf |
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| Zusammenfassung |
In this study we present a qualitative and quantitative assessment of more
than 10 yr of aerosol number size distribution data observed in the
Arctic environment (Mt. Zeppelin (78°56' N, 11°53' E,
474 m a.s.l.), Ny Ålesund, Svalbard). We provide statistics on both
seasonal and diurnal characteristics of the aerosol observations and
conclude that the Arctic aerosol number size distribution and related
parameters such as integral mass and surface area exhibit a very pronounced
seasonal variation. This seasonal variation seems to be controlled by both
dominating source as well as meteorological conditions. Three distinctly
different periods can be identified during the Arctic year: the haze period
characterized by a dominating accumulation mode aerosol (March–May),
followed by the sunlit summer period with low abundance of accumulation mode
particles but high concentration of small particles which are likely to be
recently and locally formed (June–August). The rest of the year is
characterized by a comparably low concentration of accumulation mode
particles and negligible abundance of ultrafine particles
(September–February). A minimum in aerosol mass and number concentration is
usually observed during September/October.
We further show that the transition between the different regimes is fast,
suggesting rapid change in the conditions defining their appearance. A
source climatology based on trajectory analysis is provided, and it is shown
that there is a strong seasonality of dominating source areas, with Eurasia
dominating during the Autumn–Winter period and dominance of North Atlantic
air during the summer months. We also show that new-particle formation
events are rather common phenomena in the Arctic during summer, and this is
the result of photochemical production of nucleating/condensing species in
combination with low condensation sink. It is also suggested that wet
removal may play a key role in defining the Arctic aerosol year, via the
removal of accumulation mode size particles, which in turn have a pivotal
role in facilitating the conditions favorable for new-particle formation
events. In summary the aerosol Arctic year seems to be at least
qualitatively predictable based on the knowledge of seasonality of transport
paths and associated source areas, meteorological conditions and removal
processes. |
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