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Diurnal production of gaseous mercury in the alpine snowpack before snowmelt

Fain, Xavier and Grangeon, Sylvain and Bahlmann, Enno and Fritsche, Johannes and Obrist, Daniel and Dommergue, Aurelien and Ferrari, Christophe P. and Cairns, Warren and Ebinghaus, Ralf and Barbante, Carlo and Cescon, Paolo and Boutron, Claude. (2007) Diurnal production of gaseous mercury in the alpine snowpack before snowmelt. Journal of geophysical research. D, Atmospheres, Vol. 112 , D21311.

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Official URL: http://edoc.unibas.ch/dok/A5251634

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Abstract

In March 2005, an extensive mercury study was performed just before snowmelt at Col de Porte, an alpine site close to Grenoble, France. Total mercury concentration in the snowpack ranged from 80 +/- 08 to 160 +/- 15 ng l(-1), while reactive mercury was below detection limit (0.2 ng l(-1)). We observed simultaneously a production of gaseous elemental mercury (GEM) in the top layer of the snowpack and an emission flux from the snow surface to the atmosphere. Both phenomena were well correlated with solar irradiation, indicating photo-induced reactions in the snow interstitial air (SIA). The mean daily flux of GEM from the snowpack was estimated at similar to 9 ng m(-2) d(-1). No depletion of GEM concentrations was observed in the SIA, suggesting no occurrence of oxidation processes. The presence of liquid water in the snowpack clearly enhanced GEM production in the SIA. Laboratory flux chamber measurements enabled us to confirm that GEM production from this alpine snowpack was first driven by solar radiation (especially UVA and UVB radiation), and then by liquid water in the snowpack. Finally, a large GEM emission from the snow surface occurred during snowmelt, and we report total mercury concentrations in meltwater of about 72 ng l(-1).
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Fritsche, Johannes
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Geophysical Union
ISSN:0148-0227
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:30
Deposited On:22 Mar 2012 14:16

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