Li, Chuxian, Sonke, Jeroen E., Le Roux, Gaël et al. (10 more authors) (2020) Unequal Anthropogenic Enrichment of Mercury in Earth's Northern and Southern Hemispheres. ACS Earth and Space Chemistry. pp. 2073-2081. ISSN 2472-3452
Abstract
Remote Northern Hemisphere (NH) and Southern Hemisphere (SH) lake sediment and peat records of mercury (Hg) deposition have shown a ×3 to ×5 Hg enrichment since pre-industrial times (<1880 AD), leading to the perception that global atmospheric Hg enrichment is moderate and uniform across the hemispheres. Anthropogenic Hg emissions in the NH are, however, approximately 4 times higher than those in the SH. Here, we reconstruct atmospheric Hg deposition in four remote SH peatlands and review sediment and peat Hg records from both hemispheres. We observe a ×4 all-time enrichment in SH Hg deposition from pre-anthropogenic (<1450 AD) to the late 20th-century periods, which is lower than the large ×16 all-time enrichment in NH Hg deposition. We attribute this difference to lower anthropogenic Hg emissions in the SH, and higher natural atmospheric SH Hg concentrations, supported by ×2 higher natural background Hg accumulation in SH peat records. We suggest that the higher SH natural atmospheric Hg deposition reflects the SH land-ocean distribution, and is driven by important SH marine Hg emissions. Our findings indicate that atmospheric Hg background levels and anthropogenic enrichment in both hemispheres are different and should be taken into account in international Hg assessments and environmental policy.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Keywords: | archive,deposition,enrichment,hemisphere,mercury,peat,sediment |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Environment and Geography (York) |
Depositing User: | Pure (York) |
Date Deposited: | 04 Jan 2021 16:40 |
Last Modified: | 25 Jan 2025 00:10 |
Published Version: | https://doi.org/10.1021/acsearthspacechem.0c00220 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1021/acsearthspacechem.0c00220 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:169560 |
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