title: Atmospheric mercury inputs in montane soils increase with elevation: evidence from mercury isotope signatures.
abstract: The influence of topography on the biogeochemical cycle of mercury (Hg) has received relatively little attention. Here, we report the measurement of Hg species and their corresponding isotope composition in soil sampled along an elevational gradient transect on Mt. Leigong in subtropical southwestern China. The data are used to explain orography-related effects on the fate and behaviour of Hg species in montane environments. The total- and methyl-Hg concentrations in topsoil samples show a positive correlation with elevation. However, a negative elevation dependence was observed in the mass-dependent fractionation (MDF) and mass-independent fractionation (MIF) signatures of Hg isotopes. Both a MIF (Δ(199)Hg) binary mixing approach and the traditional inert element method indicate that the content of Hg derived from the atmosphere distinctly increases with altitude.
authors.affiliation: 1] State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China [2] Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, 0349 Oslo, Norway [3].
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Run-sheng
authors.initials: RS
authors.lastname: Yin
authors.forename: Xin-bin
authors.initials: XB
authors.lastname: Feng
authors.forename: Jonas
authors.initials: J
authors.lastname: Sommar
authors.forename: Christopher W N
authors.initials: CW
authors.lastname: Anderson
authors.forename: Atindra
authors.initials: A
authors.lastname: Sapkota
authors.forename: Xue-wu
authors.initials: XW
authors.lastname: Fu
authors.forename: Thorjørn
authors.initials: T
authors.lastname: Larssen