Nitrate dry deposition in Svalbard (Articolo in rivista)

Type
Label
  • Nitrate dry deposition in Svalbard (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • Mats P. Björkman1,2*, Rafael Kühnel1,2, Daniel G. Partridge3,4, Tjarda J. Roberts1, Wenche Aas5, Mauro Mazzola6, Angelo Viola7, Andy Hodson8, Johan Ström3, Elisabeth (2012)
    Nitrate dry deposition in Svalbard
    in Tellus. Series B, Chemical and physical meteorology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Mats P. Björkman1,2*, Rafael Kühnel1,2, Daniel G. Partridge3,4, Tjarda J. Roberts1, Wenche Aas5, Mauro Mazzola6, Angelo Viola7, Andy Hodson8, Johan Ström3, Elisabeth (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1Norwegian Polar Institute, Fram Centre, N-9296 Tromsø, Norway. 2Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, Norway. 3Department of Applied Environmental Science, Stockholm University, Svante Arrhenius väg 8, SE-11418 Stockholm, Sweden. 4Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom. 5NILU -Norwegian Institute for Air Research, Instituttv 18, N-2027 Kjeller, Norway. 6National Research Council, Institute of Atmospheric Sciences and Climate (ISAC-CNR), Via Gobetti 101, 40129 Bologna, Italy. 7National Research Council, Institute of Atmospheric Sciences and Climate (ISAC-CNR), Via del Fosso del Cavaliere 100, 00133 Rome, Italy. 8Department of Geography, The University of Sheffield, Sheffield S10 2TN, U.K. (literal)
Titolo
  • Nitrate dry deposition in Svalbard (literal)
Abstract
  • Arctic regions are generally nutrient limited, receiving an extensive part of their bio-available nitrogen from deposition of atmospheric reactive nitrogen. Reactive nitrogen oxides, as nitric acid (HNO3) and nitrate aerosols (p-NO3), can either be washed out from the atmosphere with precipitation or dry deposited, dissolving to nitrate (NO3-). During winter, NO3- is accumulated in the snowpack and released as a pulse during spring melt. Quantification of NO3- deposition is essential to assess impacts on Arctic terrestrial ecology and ice core interpretations. However, the individual importance of wet and dry deposition is poorly quantified in the high Arctic regions where in-situ measurements are demanding. In this study, three different methods are employed to quantify NO3- dry deposition around the atmospheric and ecosystem monitoring site, Ny-Ålesund, Svalbard. 1) A snow tray sampling approach indicates a dry deposition of - 10.27 ± 3.84 mg m-2 over the entire winter season (September 2009 to May 2010). 2) A glacial sampling approach gave higher values - 30.68 ± 12.00 mg m-2 for the same winter. 3) Dry deposition was also modelled for HNO3 and p-NO3 using atmospheric concentrations and stability observations, resulting in a total combined nitrate dry deposition of - 10.76 ± 1.26 mg m-2 over the same winter. The model indicates that deposition primarily occurs via HNO3 with only a minor contribution by p-NO3. Modelled median deposition velocities largely explain this difference: 0.63 cm s-1 for HNO3 while p-NO3 was 0.0025 and 0.16 cm s-1 for particle sizes 0.7 and 7 ?m respectively. The three methods were within two standard errors agreement, attributing an average 14 % (total range of 2- 44%) of the total nitrate deposition to dry deposition. Dry deposition events were identified in association with elevated atmospheric concentrations, corroborating recent studies that identified episodes of rapid pollution transport and deposition to the Arctic. (literal)
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