Resolving Atmospheric Mercury Loading and Source Trends from Isotopic Records of Remote North American Lake Sediments.
Identifieur interne : 000126 ( Main/Corpus ); précédent : 000125; suivant : 000127Resolving Atmospheric Mercury Loading and Source Trends from Isotopic Records of Remote North American Lake Sediments.
Auteurs : Ryan F. Lepak ; Sarah E. Janssen ; Daniel R. Engstrom ; David P. Krabbenhoft ; Michael T. Tate ; Runsheng Yin ; William F. Fitzgerald ; Sonia A. Nagorski ; James P. HurleySource :
- Environmental science & technology [ 1520-5851 ] ; 2020.
Abstract
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.
DOI: 10.1021/acs.est.0c00579
PubMed: 32597170
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pubmed:32597170Le document en format XML
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<affiliation><nlm:affiliation>U.S. Geological Survey, Upper Midwest Water Science Center, USGS Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States.</nlm:affiliation>
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<affiliation><nlm:affiliation>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.</nlm:affiliation>
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<affiliation><nlm:affiliation>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.</nlm:affiliation>
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<front><div type="abstract" xml:lang="en">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 δ<sup>202</sup>
Hg and Δ<sup>199</sup>
Hg values. These trends can be attributed to large-scale industrial emission of Hg into the atmosphere and are consistent with positive Δ<sup>199</sup>
Hg values measured in modern-day precipitation and modeled increases in δ<sup>202</sup>
Hg 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.</div>
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<Abstract><AbstractText>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 δ<sup>202</sup>
Hg and Δ<sup>199</sup>
Hg values. These trends can be attributed to large-scale industrial emission of Hg into the atmosphere and are consistent with positive Δ<sup>199</sup>
Hg values measured in modern-day precipitation and modeled increases in δ<sup>202</sup>
Hg 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.</AbstractText>
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<AffiliationInfo><Affiliation>University of Wisconsin Aquatic Sciences Center, 1975 Willow Dr., Madison, Wisconsin 53706, United States.</Affiliation>
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