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| Titel |
Nitrogen oxides and PAN in plumes from boreal fires during ARCTAS-B and their impact on ozone: an integrated analysis of aircraft and satellite observations |
| VerfasserIn |
M. J. Alvarado, J. A. Logan, J. Mao, E. Apel, D. Riemer, D. Blake, R. C. Cohen, K.-E. Min, A. E. Perring, E. C. Browne, P. J. Wooldridge, G. S. Diskin, G. W. Sachse, H. Fuelberg, W. R. Sessions, D. L. Harrigan, G. Huey, J. Liao, A. Case-Hanks, J. L. Jimenez, M. J. Cubison, S. A. Vay, A. J. Weinheimer, D. J. Knapp, D. D. Montzka, F. M. Flocke, I. B. Pollack, P. O. Wennberg, A. Kürten, J. Crounse, J. M. St. Clair, A. Wisthaler, T. Mikoviny, R. M. Yantosca, C. C. Carouge, P. Sager |
| 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. 20 ; Nr. 10, no. 20 (2010-10-18), S.9739-9760 |
| Datensatznummer |
250008831
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| Publikation (Nr.) |
 copernicus.org/acp-10-9739-2010.pdf |
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| Zusammenfassung |
| We determine enhancement ratios for NOx, PAN, and other NOy
species from boreal biomass burning using aircraft data obtained during the
ARCTAS-B campaign and examine the impact of these emissions on tropospheric
ozone in the Arctic. We find an initial emission factor for NOx of
1.06 g NO per kg dry matter (DM) burned, much lower than previous
observations of boreal plumes, and also one third the value recommended for
extratropical fires. Our analysis provides the first observational
confirmation of rapid PAN formation in a boreal smoke plume, with 40% of the
initial NOx emissions being converted to PAN in the first few hours
after emission. We find little clear evidence for ozone formation in the
boreal smoke plumes during ARCTAS-B in either aircraft or satellite
observations, or in model simulations. Only a third of the smoke plumes
observed by the NASA DC8 showed a correlation between ozone and CO, and ozone
was depleted in the plumes as often as it was enhanced. Special observations
from the Tropospheric Emission Spectrometer (TES) also show little evidence
for enhanced ozone in boreal smoke plumes between 15 June and 15 July 2008.
Of the 22 plumes observed by TES, only 4 showed ozone increasing within the
smoke plumes, and even in those cases it was unclear that the increase was
caused by fire emissions. Using the GEOS-Chem atmospheric chemistry model, we
show that boreal fires during ARCTAS-B had little impact on the median ozone
profile measured over Canada, and had little impact on ozone within the smoke
plumes observed by TES. |
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