TY  - JOUR
AU  - Fain, X.
AU  - Ferrari, C. P.
AU  - Gauchard, P-A
AU  - Magand, O.
AU  - Boutron, C.
PY  - 2006//
TI  - Fast depletion of gaseous elemental mercury in the Kongsvegen Glacier snowpack in Svalbard
JO  - Geophysical research letters
VL  - 33
PB  - American Geophysical Union
KW  - 0317 Atmospheric Composition and Structure: Chemical kinetic and photochemical properties
KW  - 0322 Atmospheric Composition and Structure: Constituent sources and sinks
KW  - 0330 Atmospheric Composition and Structure: Geochemical cycles
KW  - 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry
KW  - 0736 Cryosphere: Snow
N2  - Gaseous elemental mercury (GEM, Hg°) was measured in the snowpack interstitial air on the Kongsvegen Glacier (Svalbard) between the surface and 190 cm depth. A rapid depletion of GEM from ?5 to 0.4 ng.m?3 in the snowpack air was measured in less than 8 hours at a calculated depletion rate of ?0.5–0.7 ng.m?3.h?1 while concentration of GEM above the snow stayed constant about 1.7 ng.m?3. This depletion could only be explained by chemical processes and this study suggests that Br. could be the most important reactant for the oxidation of GEM in the interstitial snow air. The lifetime of GEM was estimated to be ?10 minutes with second order reaction rate constant between GEM and Br. of about ?2 × 10?11 cm?3.molecule?1.s?1. These first experimental kinetic values for GEM oxidation in the snow air are in good agreement with both theoretical and modelling studies previously reported.
SN  - 0094-8276
UR  - http://dx.doi.org/10.1029/2005GL025223
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=5592), last updated on Mon, 27 Apr 2009 14:03:35 +0200
ID  - Fain_etal2006
ER  -