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| Titel |
Changes in aerosol properties during spring-summer period in the Arctic troposphere |
| VerfasserIn |
A.-C. Engvall, R. Krejci, J. Ström, R. Treffeisen, R. Scheele, O. Hermansen, J. Paatero |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2008-02-01), S.445-462 |
| Datensatznummer |
250005537
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| Publikation (Nr.) |
 copernicus.org/acp-8-445-2008.pdf |
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| Zusammenfassung |
| The change in aerosol properties during the transition from the more
polluted spring to the clean summer in the Arctic troposphere was studied. A
six-year data set of observations from Ny-Ålesund on Svalbard, covering
the months April through June, serve as the basis for the characterisation
of this time period. In addition four-day-back trajectories were used to
describe air mass histories. The observed transition in aerosol properties
from an accumulation-mode dominated distribution to an Aitken-mode dominated
distribution is discussed with respect to long-range transport and
influences from natural and anthropogenic sources of aerosols and pertinent
trace gases. Our study shows that the air-mass transport is an important
factor modulating the physical and chemical properties observed. However,
the air-mass transport cannot alone explain the annually repeated systematic
and rather rapid change in aerosol properties, occurring within a limited
time window of approximately 10 days. With a simplified phenomenological
model, which delivers the nucleation potential for new-particle formation,
we suggest that the rapid shift in aerosol microphysical properties between
the Arctic spring and summer is mainly driven by the incoming solar
radiation in concert with transport of precursor gases and changes in
condensational sink. |
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