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

Författare och institution:
A. Ianniello (-); F. Spataro (-); R. Salvatori (-); M. Valt (-); M. Nardino (-); Mats P. Björkman (Institutionen för geovetenskaper); G. Esposito (-); M. Montagnoli (-)
Publicerad i:
Rendiconti Lincei-Scienze Fisiche E Naturali, 27 ( supplement 1 ) s. 33-45
Artikel, refereegranskad vetenskaplig
Sammanfattning (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.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap
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
Postens nummer:
Posten skapad:
2016-10-18 14:00
Posten ändrad:
2016-10-19 11:41

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