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| Titel |
Surprisingly small HONO emissions from snow surfaces at Browning Pass, Antarctica |
| VerfasserIn |
H. J. Beine, A. Amoroso, F. Domine, M. D. King, M. Nardino, A. Ianniello, J. L. France |
| 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 ; 6, no. 9 ; Nr. 6, no. 9 (2006-07-03), S.2569-2580 |
| Datensatznummer |
250003979
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| Publikation (Nr.) |
 copernicus.org/acp-6-2569-2006.pdf |
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| Zusammenfassung |
| Measured Fluxes of nitrous acid at Browning
Pass, Antarctica were very low, despite conditions that are generally
understood as favorable for HONO emissions, including: acidic snow surfaces,
an abundance of NO3- anions in the snow surface, and abundant UV
light for NO3- photolysis. Photochemical modeling suggests noon
time HONO fluxes of 5–10 nmol m-2 h-1; the measured fluxes,
however, were close to zero throughout the campaign. The location and state
of NO3- in snow is crucial to its reactivity. The analysis of
soluble mineral ions in snow reveals that the NO3- ion is probably
present in aged snows as NaNO3. This is peculiar to our study site, and
we suggest that this may affect the photochemical reactivity of
NO3-, by preventing the release of products, or providing a
reactive medium for newly formed HONO. In fresh snow, the NO3- ion
is probably present as dissolved or adsorbed HNO3 and yet, no HONO
emissions were observed. We speculate that HONO formation from
NO3- photolysis may involve electron transfer reactions of
NO2 from photosensitized organics and that fresh snows at our site had
insufficient concentrations of adequate organic compounds to favor this
reaction. |
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