期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 54, 期 15, 页码 9325-9333出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.0c00579
关键词
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资金
- U.S. Geological Survey Toxic Substances Hydrology Program
- Wisconsin Alumni Research Foundation through the University of Wisconsin-Madison Graduate School [MSN165161]
- University of Wisconsin Water Resources Institute through a USGS-NIWR fellowship [MSN197848]
- National Science Foundation Postdoctoral Fellowships for Research in Biology-Collection Program 2018 [1812211]
- U.S.EPA-STAR (Science to Achieve Results) Program [R829796, 91643401]
- NSF Office of Polar Programs [9908895]
- National Park Service PNW CESU [P14AC01393]
- Direct For Biological Sciences
- Div Of Biological Infrastructure [1812211] Funding Source: National Science Foundation
- Division Of Polar Programs
- Directorate For Geosciences [9908895] Funding Source: National Science Foundation
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 delta Hg-202 and Delta Hg-199 values. These trends can be attributed to large-scale industrial emission of Hg into the atmosphere and are consistent with positive Delta Hg-199 values measured in modern-day precipitation and modeled increases in delta Hg-202 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.
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