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Resolving Atmospheric Mercury Loading and Source Trends from Isotopic Records of Remote North American Lake Sediments.
Lepak, Ryan F; Janssen, Sarah E; Engstrom, Daniel R; Krabbenhoft, David P; Tate, Michael T; Yin, Runsheng; Fitzgerald, William F; Nagorski, Sonia A; Hurley, James P.
Afiliação
  • Lepak RF; Environmental Chemistry and Technology Program, University of Wisconsin-Madison, 660 N. Park Street, Madison, Wisconsin 53706, United States.
  • Janssen SE; U.S. Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States.
  • Engstrom DR; U.S. Environmental Protection Agency Office of Research and Development, Center for Computational Toxicology and Exposure, Great Lakes Toxicology and Ecology Division, 6201 Congdon Blvd, Duluth, Minnesota 55804, United States.
  • Krabbenhoft DP; U.S. Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States.
  • Tate MT; St. Croix Watershed Research Station, Science Museum of Minnesota, 16910 152nd St. N., Marine on St. Croix, Minnesota 55047, United States.
  • Yin R; U.S. Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States.
  • Fitzgerald WF; U.S. Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States.
  • Nagorski SA; State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng West Road, Guanshanhu District, Guiyang, Guizhou 550081, China.
  • Hurley JP; Department of Marine Sciences, University of Connecticut, Groton, Connecticut 06340, United States.
Environ Sci Technol ; 54(15): 9325-9333, 2020 08 04.
Article em En | MEDLINE | ID: mdl-32597170
The strongest evidence for anthropogenic alterations to the global mercury (Hg) cycle comes from historical records of mercury deposition preserved in lake sediments. Hg isotopes have added a new dimension to these sedimentary archives, promising additional insights into Hg source apportionment and biogeochemical processing. Presently, most interpretations of historical changes are constrained to a small number of locally contaminated ecosystems. Here, we describe changes in natural Hg isotope records from a suite of dated sediment cores collected from various remote lakes of North America. In nearly all cases, the rise in industrial-use Hg is accompanied by an increase in δ202Hg and Δ199Hg values. These trends can be attributed to large-scale industrial emission of Hg into the atmosphere and are consistent with positive Δ199Hg values measured in modern-day precipitation and modeled increases in δ202Hg values from global emission inventories. Despite similar temporal trends among cores, the baseline isotopic values vary considerably among the different study regions, likely attributable to differences in the fractionation produced in situ as well as differing amounts of atmospherically delivered Hg. Differences among the study lakes in precipitation and watershed size provide an empirical framework for evaluating Hg isotopic signatures and global Hg cycling.
Assuntos

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Mercúrio Tipo de estudo: Prognostic_studies País/Região como assunto: America do norte Idioma: En Revista: Environ Sci Technol Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Mercúrio Tipo de estudo: Prognostic_studies País/Região como assunto: America do norte Idioma: En Revista: Environ Sci Technol Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Estados Unidos