A peat core Hg stable isotope reconstruction of Holocene atmospheric Hg deposition at Amsterdam Island (37.8°S) ...

Mercury (Hg) stable isotopes have been broadly used to investigate the sources, transformation and deposition of atmospheric Hg during the industrial era thanks to the multiple isotope signatures deriving from mass-dependent (represented by δ) and mass-independent fractionation (represented by Δ) in...

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Bibliographic Details
Main Authors: Li, Chuxian, Enrico, Maxime, Magand, Oliver, Araujo, Beatriz F., Le Roux, Gaël, Osterwalder, Stefan, Dommergue, Aurélien, Bertrand, Yann, Brioude, Jérôme, De Vleeschouwer, François, Sonke, Jeroen E.
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2023
Subjects:
Hg stable isotopes
Southern Hemisphere
Peat
Rain
Hg deposition
Amsterdam Island
Online Access:https://dx.doi.org/10.3929/ethz-b-000583105
http://hdl.handle.net/20.500.11850/583105
Description
Summary:Mercury (Hg) stable isotopes have been broadly used to investigate the sources, transformation and deposition of atmospheric Hg during the industrial era thanks to the multiple isotope signatures deriving from mass-dependent (represented by δ) and mass-independent fractionation (represented by Δ) in the environment. Less is known about the impact of past climate change on atmospheric Hg deposition and cycling, and whether Hg isotopes covary with past climate. Here, we investigate Hg concentration and Hg isotope signatures in a 6600-year-old ombrotrophic peat record from Amsterdam Island (AMS, 37.8oS), and in modern rainfall and gaseous elemental Hg (Hg0) samples. Results show that Holocene atmospheric Hg deposition and plant Hg uptake covary with dust deposition, and are both lower under a high humidity regime associated with enhanced Southern Westerly Winds (SWW). Modern AMS gaseous Hg0 and rainfall HgII isotope signatures are similar to those in the Northern Hemisphere (NH). Holocene peat Δ199Hg and Δ200Hg ... : Geochimica et Cosmochimica Acta, 341 ...

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