Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 9 2006 10.5194/acp-6-2569-2006 http://www.atmos-chem-phys.net/6/2569/2006/ http://www.atmos-chem-phys.net/6/2569/2006/acp-6-2569-2006.html http://www.atmos-chem-phys.net/6/2569/2006/acp-6-2569-2006.pdf 2569 2580 2006-07-03 Surprisingly small HONO emissions from snow surfaces at Browning Pass, Antarctica H. J. Beine harry@iia.cnr.it A. Amoroso F. Dominé M. D. King M. Nardino A. Ianniello J. L. France 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 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. 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