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Titel |
The multi-seasonal NOy budget in coastal Antarctica and its link with surface snow and ice core nitrate: results from the CHABLIS campaign |
VerfasserIn |
A. E. Jones, E. W. Wolff, D. Ames, S. J.-B. Bauguitte, K. C. Clemitshaw, Z. Fleming, G. P. Mills, A. Saiz-Lopez, R. A. Salmon, W. T. Sturges, D. R. Worton |
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 ; 11, no. 17 ; Nr. 11, no. 17 (2011-09-08), S.9271-9285 |
Datensatznummer |
250010062
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Publikation (Nr.) |
copernicus.org/acp-11-9271-2011.pdf |
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Zusammenfassung |
Measurements of a suite of individual NOy components were
carried out at Halley station in coastal Antarctica as part of the CHABLIS
campaign (Chemistry of the Antarctic Boundary Layer and the Interface with
Snow). Conincident measurements cover over half a year, from austral winter
2004 through to austral summer 2005. Results show clear dominance of organic
NOy compounds (PAN and MeONO2) during the winter months, with low
concentrations of inorganic NOy. During summer, concentrations of inorganic
NOy compounds are considerably greater, while those of organic compounds,
although lower than in winter, are nonetheless significant. The relative
concentrations of the alkyl nitrates, as well as their seasonality, are
consistent with an oceanic source. Multi-seasonal measurements of surface
snow nitrate correlate strongly with inorganic NOy species (especially
HNO3) rather than organic. One case study in August suggested that, on
that occasion, particulate nitrate was the dominant source of nitrate to the
snowpack, but this was not the consistent picture throughout the measurement
period. An analysis of NOx production rates showed that emissions of NOx
from the snowpack overwhelmingly dominate over gas-phase sources. This
result suggests that, for certain periods in the past, the flux of NOx into
the Antarctic boundary layer can be calculated from ice core nitrate data. |
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