Journal
ATMOSPHERIC ENVIRONMENT
Volume 40, Issue 11, Pages 1949-1956Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2005.11.027
Keywords
HONO; nitrous acid; atmospheric chemistry; snow surface chemistry; ozone depletion; arctic
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Measurements of snow surface-atmosphere exchange fluxes of nitrous acid at Ny-angstrom lesund, Svalbard during springtime confirmed earlier findings that no significant emissions occurred from alkaline snow surfaces at this marine high Arctic location. On 29 April 2004 air arriving from the North Pole brought both ozone depleted air and significant snowfall. On that day we observed HONO emission fluxes of up to 40 nmol m(-2) h(-1). These emissions were made possible by the combination of two independent phenomena. The acidic snow allowed the transport of NO3- ions to photochemically reactive areas and the release of produced HONO from the snow interstitial air; while the absence of ozone likely increased the HONO/NO fraction over that of NO2 in the snow interstitial air. (c) 2005 Elsevier Ltd. All rights reserved.
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