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| Titel |
The Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission: design, execution, and first results |
| VerfasserIn |
D. J. Jacob, J. H. Crawford, H. Maring, A. D. Clarke, J. E. Dibb, L. K. Emmons, R. A. Ferrare, C. A. Hostetler, P. B. Russell, H. B. Singh, A. M. Thompson, G. E. Shaw, E. McCauley, J. R. Pederson, J. A. Fisher |
| 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 ; 10, no. 11 ; Nr. 10, no. 11 (2010-06-14), S.5191-5212 |
| Datensatznummer |
250008524
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| Publikation (Nr.) |
 copernicus.org/acp-10-5191-2010.pdf |
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| Zusammenfassung |
| The NASA Arctic Research of the Composition of the Troposphere from Aircraft
and Satellites (ARCTAS) mission was conducted in two 3-week deployments
based in Alaska (April 2008) and western Canada (June–July 2008). Its goal
was to better understand the factors driving current changes in Arctic
atmospheric composition and climate, including (1) influx of mid-latitude
pollution, (2) boreal forest fires, (3) aerosol radiative forcing, and (4)
chemical processes. The June–July deployment was preceded by one week of
flights over California (ARCTAS-CARB) focused on (1) improving state
emission inventories for greenhouse gases and aerosols, (2) providing
observations to test and improve models of ozone and aerosol pollution.
ARCTAS involved three aircraft: a DC-8 with a detailed chemical payload, a
P-3 with an extensive aerosol and radiometric payload, and a B-200 with
aerosol remote sensing instrumentation. The aircraft data augmented
satellite observations of Arctic atmospheric composition, in particular from
the NASA A-Train. The spring phase (ARCTAS-A) revealed pervasive Asian
pollution throughout the Arctic as well as significant European pollution
below 2 km. Unusually large Siberian fires in April 2008 caused high
concentrations of carbonaceous aerosols and also affected ozone. Satellite
observations of BrO column hotspots were found not to be related to Arctic
boundary layer events but instead to tropopause depressions, suggesting the
presence of elevated inorganic bromine (5–10 pptv) in the lower
stratosphere. Fresh fire plumes from Canada and California sampled during
the summer phase (ARCTAS-B) indicated low NOx emission factors from the
fires, rapid conversion of NOx to PAN, no significant secondary aerosol
production, and no significant ozone enhancements except when mixed with
urban pollution. |
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