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| Titel |
Ozone variability and halogen oxidation within the Arctic and sub-Arctic springtime boundary layer |
| VerfasserIn |
J. B. Gilman, J. F. Burkhart, B. M. Lerner, E. J. Williams, W. C. Kuster, P. D. Goldan, P. C. Murphy, C. Warneke, C. Fowler, S. A. Montzka, B. R. Miller, L. Miller, S. J. Oltmans, T. B. Ryerson, O. R. Cooper, A. Stohl, J. A. Gouw |
| 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. 21 ; Nr. 10, no. 21 (2010-11-02), S.10223-10236 |
| Datensatznummer |
250008863
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| Publikation (Nr.) |
 copernicus.org/acp-10-10223-2010.pdf |
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| Zusammenfassung |
| The influence of halogen oxidation on the variabilities of ozone (O3)
and volatile organic compounds (VOCs) within the Arctic and sub-Arctic
atmospheric boundary layer was investigated using field measurements from
multiple campaigns conducted in March and April 2008 as part of the POLARCAT
project. For the ship-based measurements, a high degree of correlation (r = 0.98
for 544 data points collected north of 68° N) was observed between
the acetylene to benzene ratio, used as a marker for chlorine and bromine
oxidation, and O3 signifying the vast influence of halogen oxidation
throughout the ice-free regions of the North Atlantic. Concurrent airborne
and ground-based measurements in the Alaskan Arctic substantiated this
correlation and were used to demonstrate that halogen oxidation influenced
O3 variability throughout the Arctic boundary layer during these
springtime studies. Measurements aboard the R/V Knorr in the North Atlantic and
Arctic Oceans provided a unique view of the transport of O3-poor air
masses from the Arctic Basin to latitudes as far south as 52° N.
FLEXPART, a Lagrangian transport model, was used to quantitatively determine
the exposure of air masses encountered by the ship to first-year ice (FYI),
multi-year ice (MYI), and total ICE (FYI+MYI). O3 anti-correlated with
the modeled total ICE tracer (r = −0.86) indicating that up to 73% of the
O3 variability measured in the Arctic marine boundary layer could be
related to sea ice exposure. |
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