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| Titel |
Source attribution and interannual variability of Arctic pollution in spring constrained by aircraft (ARCTAS, ARCPAC) and satellite (AIRS) observations of carbon monoxide |
| VerfasserIn |
J. A. Fisher, D. J. Jacob, M. T. Purdy, M. Kopacz, P. Sager, C. Carouge, C. D. Holmes, R. M. Yantosca, R. L. Batchelor, K. Strong, G. S. Diskin, H. E. Fuelberg, J. S. Holloway, E. J. Hyer, W. W. McMillan, J. Warner, D. G. Streets, Q. Zhang, Y. Wang, S. Wu |
| 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. 3 ; Nr. 10, no. 3 (2010-02-01), S.977-996 |
| Datensatznummer |
250008025
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| Publikation (Nr.) |
 copernicus.org/acp-10-977-2010.pdf |
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| Zusammenfassung |
| We use aircraft observations of carbon monoxide (CO) from the NASA ARCTAS
and NOAA ARCPAC campaigns in April 2008 together with multiyear (2003–2008)
CO satellite data from the AIRS instrument and a global chemical transport
model (GEOS-Chem) to better understand the sources, transport, and
interannual variability of pollution in the Arctic in spring. Model
simulation of the aircraft data gives best estimates of CO emissions in
April 2008 of 26 Tg month−1 for Asian anthropogenic, 9.4 for European
anthropogenic, 4.1 for North American anthropogenic, 15 for Russian biomass
burning (anomalously large that year), and 23 for Southeast Asian biomass
burning. We find that Asian anthropogenic emissions are the dominant source
of Arctic CO pollution everywhere except in surface air where European
anthropogenic emissions are of similar importance. Russian biomass burning
makes little contribution to mean CO (reflecting the long CO lifetime) but
makes a large contribution to CO variability in the form of combustion
plumes. Analysis of two pollution events sampled by the aircraft
demonstrates that AIRS can successfully observe pollution transport to the
Arctic in the mid-troposphere. The 2003–2008 record of CO from AIRS shows
that interannual variability averaged over the Arctic cap is very small.
AIRS CO columns over Alaska are highly correlated with the Ocean Niño
Index, suggesting a link between El Niño and Asian pollution transport
to the Arctic. AIRS shows lower-than-average CO columns over Alaska during
April 2008, despite the Russian fires, due to a weakened Aleutian Low
hindering transport from Asia and associated with the moderate 2007–2008 La
Niña. This suggests that Asian pollution influence over the Arctic may
be particularly large under strong El Niño conditions. |
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