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Air-snow exchange of reactive nitrogen species at Ny-lesund, Svalbard (Arctic)

Journal article
Authors A. Ianniello
F. Spataro
R. Salvatori
M. Valt
M. Nardino
Mats P. Björkman
G. Esposito
M. Montagnoli
Published in Rendiconti Lincei-Scienze Fisiche E Naturali
Volume 27
Issue supplement 1
Pages 33-45
ISSN 2037-4631
Publication year 2016
Published at Department of Earth Sciences
Pages 33-45
Language en
Links dx.doi.org/10.1007/s12210-016-0536-...
Keywords Arctic region, Snow surface, Nitrogen oxides, Nitric acid, Particulate nitrate, Nitrogen fluxes, peroxyacetyl nitrate pan, surface-area, alert 2000, gas-phase, photochemical production, organic contaminants, coastal antarctica, zeppelin mountain, boundary-layer, north-atlantic
Subject categories Earth and Related Environmental Sciences

Abstract

Measurements of atmospheric concentrations and fluxes of reactive nitrogen (NO, NO2, HNO3, NO3 (-) (fine) and NO3 (-) (coarse)) above the snow surface were performed from 29 March to 30 April 2010 at Ny-lesund, Svalbard. Determinations of chemical and physical properties of snow were also carried out. Both NO and NO2 showed clear diurnal cycles with noontime maxima and nighttime minima. Significant emission fluxes of NO and NO2 were observed, reaching noontime values up to 19.42 and 25.20 pmol/m(2) s, respectively. The snow surface was the source of NO and NO2 but these observed releases were small due to almost alkaline snow environment and chemical forms of snow NO3 (-). Significant deposition fluxes of HNO3, fine and coarse particulate NO3 (-) fluxes were also observed, reaching peak values up to -18.00, -37.80 and -12.50 pmol/m(2) s, respectively, during snowfall events. Measurements of surface snow provided experimental data that the total contribution of dry deposition of these species to the NO3 (-) -N in the snow was about 24 %. However, wet deposition in falling snow seemed to be the major contribution to the nitrate input to the snow.

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