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| Titel: |
Fluxes of nitrates between snow surfaces and the atmosphere in the European high Arctic |
| Auteur: |
H. J. Beine F. Dominè A. Ianniello M. Nardino I. Allegrini K. Teinilä R. Hillamo |
| Verschenen in: |
Atmospheric chemistry and physics |
| Paginering: | Jaargang 3 (2003) nr. 2 pagina's 335-346 |
| Jaar: |
2003 |
| Inhoud: |
Measurements of atmospheric and snow mixing ratios of nitrates and nitrites and their fluxes above the snow surface were made during two intensive campaigns during spring time 2001 at Ny-Ålesund, Svalbard as part of the EU project "`The NItrogen Cycle and Effects on the oxidation of atmospheric trace species at high latitudes' (NICE).<br> <br> At this coastal site close to the unseasonably unfrozen fjord, of the measured nitrogen species, only HNO<sub>3</sub> showed a significant flux on to the snow surface; a mean deposition of -8.7 nmol h<sup>-1</sup> m<sup>-2</sup> was observed in late April / early May 2001. These fluxes may be due to the reaction of HNO<sub>3</sub> with sea salt, and especially NaCl, or may be simply uptake of HNO<sub>3</sub> by ice, which is alkaline because of the sea salt in our marine environment. During snowfall periods dry deposition of HNO<sub>3</sub> may contribute up to 10% of the N budget in the snow; however, the main source for N is wet deposition in falling snow.<br> <br> The surface snow at Ny-Ålesund showed very complex stratigraphy; the NO<sub>3</sub><sup>-</sup> mixing ratio in snow varied between 65 and 520 ng g<sup>-1</sup>, the total NO<sub>3</sub><sup>-</sup> content of the snowpack was on the order of 2700 ng cm<sup>-2</sup>. In comparison the atmospheric boundary layer column showed a NO<sub>3</sub><sup>-</sup> content of only 8 ng cm<sup>-2</sup>. The limited exchange, however, between the snow and the atmosphere was attributed to low mobility of NO<sub>3</sub><sup>-</sup> in the observed snow.<br> <br> Contrary to other Arctic sites (i.e. Alert, Nunavut or Summit, Greenland) deposition of sea salt and crustal aerosols in this marine environment made the surface snow alkaline; snow NO<sub>3</sub><sup>-</sup> was associated with heavier cations and was not readily available for physical exchange or photochemical reactions. |
| Uitgever: |
Copernicus GmbH (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 14 gevonden artikelen
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