HR: 1340h
AN: A53B-1142    [Abstracts]
TI: Three Events of Nitrogen Emission From Snow Surfaces at Ny-Ålesund, Svalbard (Arctic)
AU: * Amoroso, A
EM: amoroso@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016, Italy
AU: Beine, H
EM: harry@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016, Italy
AU: Beine, H
EM: harry@iia.cnr.it
AF: Caltech, 1200 E. California Blvd, Pasadena, CA 91125,
AU: Esposito, G
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016, Italy
AU: Nardino, M
AF: C.N.R. – IBIMET, Sezione di Bologna, via Gobetti 101, Bologna, 40129, Italy
AU: Domine, F
AF: CNRS – LGGE, 54 rue Moliere, Saint Martin d'Heres, 38402, France
AU: Ianniello, A
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016, Italy
AB: Measurements of HONO, HNO₃, NO and NO₂ were made at two heights above the snow surface near the Italian Station "Dirigibile Italia" at the Kongsfjorden International Research Base at Ny-Ålesund, Svalbard (79°N), between February 20, 2006 and April 20, 2006. Median mixing ratios were 13.2 pmol mol^-1, for HONO, and 19.8 pmol mol^-1 for HNO₃, measured during this period. Visible HONO gradients (25 pmol mol^-1) were only observed twice during the period of 24-h sunlight; both times after snowfalls that deposited large amounts of HNO₃ (-50 pmol mol^-1) on to the snow surface. Three different periods of nitrogen emissions were studied during the campaign. The emission of NO, NO₂ and HONO were correlated with fresh snowfall events. HONO emissions were also correlated with the presence of ammonium ions, which we take as tracers for organic compounds in marine aerosols. HONO was likely formed on the surface of ice crystals by the heterogeneous reaction of NO₂ involving humic acids or other organic compounds.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0736 Snow (1827, 1863)
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting