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Laboratory simulation of Hg0 emissions from a snowpack

Abstract : Snow surfaces play an important role in the biogeochemical cycle of mercury in high-latitude regions. Snowpacks act both as sources and sinks for gaseous compounds. Surprisingly, the roles of each environmental parameter that can govern the air–surface exchange over snow are not well understood owing to the lack of systematic studies. A laboratory system called the laboratory flux measurement system was used to study the emission of gaseous elemental mercury from a natural snowpack under controlled conditions. The first results from three snowpacks originating from alpine, urban and polar areas are presented. Consistent with observations in the field, we were able to reproduce gaseous mercury emissions and showed that they are mainly driven by solar radiation and especially UV-B radiation. From these laboratory experiments, we derived kinetic constants which show that divalent mercury can have a short natural lifetime of about 4–6 h in snow.
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Submitted on : Friday, April 17, 2009 - 9:41:02 AM
Last modification on : Thursday, November 19, 2020 - 3:54:29 PM

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Aurélien Dommergue, Enno Bahlmann, Ralf Ebinghaus, Christophe Ferrari, Claude Boutron. Laboratory simulation of Hg0 emissions from a snowpack. Analytical and Bioanalytical Chemistry, Springer Verlag, 2007, 388 (24), pp.319 à 327. ⟨10.1007/s00216-007-1186-2⟩. ⟨insu-00376234⟩

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