Data/hora: 13/06/2024 07:00:29

Provedor de dados: | 5
País: | France
Título: | Springtime changes in snow chemistry lead to new insights into mercury methylation in the Arctic
Autores: | Larose, Catheririe; Dommergue, Aurelien; De Angelis, Martine; Cossa, Daniel; Averty, Bernard; Marusczak, Nicolas; Soumis, Nicolas; Schneider, Dominique; Ferrari, Christophe.
Data: | 2010-11
Ano: | 2010
Resumo: | Seasonal snow is an active media and an important climate factor that governs nutrient transfer in Arctic ecosystems. Since the snow stores and transforms nutrients and contaminants, it is of crucial importance to gain a better understanding of the dynamics of contaminant cycling within the snowpack and its subsequent release to catchments via meltwater. Over the course of a two-month field study in the spring of 2008, we collected snow and meltwater samples from a seasonal snowpack in Ny-Alesund, Norway (78 degrees 56'N, 11 degrees 52'E), which were analyzed for major inorganic ions and some organic acids, as well as total, dissolved, bioavailable mercury (THg, DHg, BioHg, respectively) and monomethylmercury (MMHg) species. We observe a seasonal gradient for ion concentrations, with surface samples becoming less concentrated as the season progressed. A significant negative correlation between BioHg and MMHg was observed in the snowpack. MMHg was positively and significantly correlated to methanesulfonate concentrations. Based on these results, we propose a new model for aerobic methylation of mercury involving species in the dimethylsulfoniopropionate cycle. (C) 2010 Elsevier Ltd. All rights reserved.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00018/12904/9880.pdf

DOI:10.1016/j.gca.2010.08.043

Editor: | Pergamon-elsevier Science Ltd
Relação: | http://archimer.ifremer.fr/doc/00018/12904/
Formato: | application/pdf
Fonte: | Geochimica Et Cosmochimica Acta (0016-7037) (Pergamon-elsevier Science Ltd), 2010-11 , Vol. 74 , N. 22 , P. 6263-6275
Fonte: | 2010 Elsevier B.V. All rights reserved.