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| Titel |
Transport of North American pollution plumes towards the Arctic detected by aircraft based aerosol composition measurements in the Arctic 2008 summer season during the POLARCAT-France campaign |
| VerfasserIn |
J. Schmale, J. Schneider, M. Brands, G. Ancellet, J. Pelon, S. R. Arnold, A. Schwarzenböck, C. Gourbeyre, S. Borrmann, K. S. Law |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026799
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| Zusammenfassung |
| Mass spectrometric aerosol measurements were performed on board the French research
aircraft ”ATR42” within the POLARCAT-France project in July 2008 from Kangerlussuaq,
Greenland. The objective of the project was to study the influence of European, North
American and Siberian pollution on the clean Arctic air. An Aerodyne C-ToF-AMS was
operated during 8 research flights near Kangerlussuaq, Greenland. The flights covered low
altitudes (400 m above sea surface and 1300 m above the ice cap) as well as the free
troposphere up to 7000 m. Additional instrumentation included aerosol and cloud
microphysics (particle number concentration and size distribution), CO and O3
measurements, as well as aerosol and ozone lidars. Here we present vertical profiles of the
submicron sulfate and organic aerosol as well as mass size distributions of these species.
While generally the Arctic air in the free troposphere was found to contain very small
submicron aerosol mass concentrations (typically 0.1 – 0.5 μg m-3), several distinct particle
layers were identified that contained sulfate aerosol. Backward trajectories indicate that
the air masses containing these sulfate aerosol particles arrived from the North
American continent (eastern Canada and the north-eastern US). Furthermore, a positive
correlation of sulfate aerosol and ozone was observed in the mid troposphere, most likely
explained by the fact that sulfate aerosol originates from aircraft emissions that
are emitted in the tropopause region while ozone is dominated by stratospheric
sources. |
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