References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-6-2569-2006

Surprisingly small HONO emissions from snow surfaces at Browning Pass, Antarctica

Beine

H. J.

¹ Amoroso

¹ Dominé

² King

M. D.

³ Nardino

⁴ Ianniello

¹ France

J. L.

C.N.R. – IIA, Via Salaria Km 29,3, 00016 Monterotondo Scalo (Roma), Italy

CNRS – LGGE, BP 96, 54 rue Molière, 38402 Saint Martin d'Hères, France

Department of Geology, Royal Holloway University of London, Egham, Surrey, TW20 0EX , UK

C.N.R. – IBIMET, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy

03 07 2006

6 9 2569 2580

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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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