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Elemental mercury fluxes over a sub-alpine grassland determined with two micrometeorological methods
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 86877
Author(s) Fritsche, J.; Obrist, D.; Zeeman, M. J.; Conen, F.; Eugster, W.; Alewell, C.
Author(s) at UniBasel Alewell, Christine
Conen, Franz
Fritsche, Johannes
Year 2008
Title Elemental mercury fluxes over a sub-alpine grassland determined with two micrometeorological methods
Journal Atmospheric environment
Volume 42
Number 13
Pages / Article-Number 2922-2933
Keywords gaseous mercury, micrometeorology, aerodynamic method, modified Bowen ratio, background soil, Switzerland
Abstract The exchange of gaseous elemental mercury (GEM) over a sub-alpine grassland in central Switzerland was measured over a full year. Seasonal and diurnal variability were measured with two micrometeorological techniques: the aerodynamic method and the modified Bowen ratio method. With these two methods mean deposition rates of 4.3 and 1.7 ng m(-2) h(-1) were calculated throughout the vegetation period. As no significant GEM exchange occurred under snow covered conditions the mean annual deposition fluxes reached 2.9 and 1.1 ng m(-2) h(-1), respectively. A fair weather period in October 2005 was selected to specifically study diurnal patterns of GEM exchange. During this time vertical day-time GEM gradients averaged 0.01 ng m(-4) and night-time gradients 0.07 ng m(-4), but no clear diurnal pattern of the GEM fluxes was observed. The measured gradients were very small, which entailed considerable uncertainties in the calculated GEM fluxes. However, the observed exchange pattern is verified by the agreement of the applied methods regarding the direction of the flux and the pronounced seasonal trends. Complementary measurements of total mercury in precipitation during three rain events revealed that dry deposition of GEM would account for 67% of a total annual input of 0.26 g ha(-1) and would therefore constitute a major deposition pathway. (C) 2008 Elsevier Ltd. All rights reserved.
Publisher Pergamon
ISSN/ISBN 1352-2310
Full Text on edoc No
Digital Object Identifier DOI 10.1016/j.atmosenv.2007.12.055
ISI-Number WOS:000256845900002
Document type (ISI) Article

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