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| Titel |
Impact of biomass burning and anthropogenic emissions on the composition of the summertime Arctic troposphere - aircraft observations during POLARCAT-GRACE |
| VerfasserIn |
A. Roiger, H. Schlager, M. Scheibe, M. Lichtenstern, P. Stock, H. Ziereis, H. Aufmhoff, F. Arnold, H. Sodemann, A. Stohl |
| 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 |
250023231
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| Zusammenfassung |
| We report on detailed chemical aircraft measurements performed in July 2008 in the
European sector of the Arctic based from Kangerlussuaq during the POLARCAT Greenland
Aerosol and Chemistry Experiment (GRACE). The DLR research aircraft FALCON was used
instrumented with a large set of in-situ trace gas (CO, CO2, O3, NO, PAN, NOy) aerosol
and meteorological measurement systems. Data were sampled during 16 flights
covering altitudes up to 12 km in order to study the pathways, dispersion and chemical
processing of forest fire and urban pollution during long-range transport into the
Arctic.
We found that the entire free troposphere above 4 km was strongly polluted by emissions
from forest fires and fossil fuel combustion during the campaign period. More than 40
distinct pollution plumes were detected with large enhancements in the mixing ratios of CO
and reactive nitrogen species. The pollution plumes originated mainly from sources in North
America, Siberia and East Asia according to FLEXPART analysis. Interestingly, many of the
plumes measured were influenced by a mix of both, biomass burning as well as
anthropogenic pollution. We discuss the chemical composition measured in the pollution
plumes and highlight differences observed between pollution plumes of different origin and
transport history. |
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