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Summertime elemental mercury exchange of temperate grasslands on an ecosystem-scale
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 86876
Author(s) Fritsche, J; Wohlfahrt, G; Ammann, C; Zeeman, M; Hammerle, A; Obrist, D; Alewell, C
Author(s) at UniBasel Alewell, Christine
Fritsche, Johannes
Year 2008
Title Summertime elemental mercury exchange of temperate grasslands on an ecosystem-scale
Journal Atmospheric Chemistry and Physics
Volume 8
Number 24
Pages / Article-Number 7709-7722
Abstract In order to estimate the air-surface mercury exchange of grasslands in temperate climate regions, fluxes of gaseous elemental mercury (GEM) were measured at two sites in Switzerland and one in Austria during summer 2006. Two classic micrometeorological methods (aerodynamic and modified Bowen ratio) have been applied to estimate net GEM exchange rates and to determine the response of the GEM flux to changes in environmental conditions (e. g. heavy rain, summer ozone) on an ecosystem-scale. Both methods proved to be appropriate to estimate fluxes on time scales of a few hours and longer. Average dry deposition rates up to 4.3 ng m(-2) h(-1) and mean deposition velocities up to 0.10 cm s(-1) were measured, which indicates that during the active vegetation period temperate grasslands are a small net sink for atmospheric mercury. With increasing ozone concentrations depletion of GEM was observed, but could not be quantified from the flux signal. Night-time deposition fluxes of GEM were measured and seem to be the result of mercury co-deposition with condensing water. Effects of grass cuts could also be observed, but were of minor magnitude.
Publisher Copernicus
ISSN/ISBN 1680-7316
Full Text on edoc Available
Digital Object Identifier DOI 10.5194/acp-8-7709-2008
PubMed ID
ISI-Number WOS:000262411800028
Document type (ISI) Article

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