Spatiotemporal Characterization of Mercury Isotope Baselines and Anthropogenic Influences in Lake Sediment Cores
Increasing mercury isotope ratios from pre‐industrial (1510–1850) to present‐day (1990–2014) in lake sediment cores have been suggested to be a global phenomenon. To assess factors leading to spatiotemporal changes, we compiled mercury concentration (THg) and mercury isotope ratios in 22 lake sedime...
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Published in | Global biogeochemical cycles Vol. 35; no. 10 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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01.10.2021
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Abstract | Increasing mercury isotope ratios from pre‐industrial (1510–1850) to present‐day (1990–2014) in lake sediment cores have been suggested to be a global phenomenon. To assess factors leading to spatiotemporal changes, we compiled mercury concentration (THg) and mercury isotope ratios in 22 lake sediment cores located at various regions of the world. We find that the positive δ202Hg shifts together with THg increases from pre‐industrial to present‐day are a widespread phenomenon. This is caused by increased contribution of mercury from local to regional anthropogenic mercury emission sources, which lead to higher sediment δ202Hg (−1.07 ± 0.69‰, 1 SD) than pre‐industrial sediments (−1.55 ± 0.96‰, 1 SD). The positive Δ199Hg shifts were observed in 15 lake sediment cores, which have low pre‐industrial Δ199Hg (−0.20 ± 0.32‰) compared to the sediment cores with near‐zero to positive pre‐industrial Δ199Hg (0.08 ± 0.07‰). The magnitudes of δ202Hg (r2 = 0.09) and Δ199Hg (r2 = 0.20, both p > 0.05) changes from pre‐industrial to present‐day did not correlate with the magnitude of THg changes. Instead, the magnitudes of δ202Hg and Δ199Hg changes decreased with increasing pre‐industrial δ202Hg and Δ199Hg values, suggesting that the baseline mercury isotope ratios play a more important role in determining the magnitude of mercury isotope changes compared to the degree of THg input. We suggest that the spatiotemporal assessments of δ202Hg in lake sediment cores can be used as an important proxy for monitoring changes in anthropogenic mercury sources for the Minamata Convention on Mercury.
Key Points
Positive δ202Hg shifts together with mercury concentration in lake sediment cores from pre‐industrial to present‐day period are a widespread phenomenon
Magnitudes of δ202Hg and Δ199Hg changes are determined by the pre‐industrial or baseline values in the sediment cores rather than the degree of mercury input
Sediment δ202Hg can be used as a proxy for monitoring changes in anthropogenic mercury sources for the Minamata Convention on Mercury |
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AbstractList | Increasing mercury isotope ratios from pre‐industrial (1510–1850) to present‐day (1990–2014) in lake sediment cores have been suggested to be a global phenomenon. To assess factors leading to spatiotemporal changes, we compiled mercury concentration (THg) and mercury isotope ratios in 22 lake sediment cores located at various regions of the world. We find that the positive δ202Hg shifts together with THg increases from pre‐industrial to present‐day are a widespread phenomenon. This is caused by increased contribution of mercury from local to regional anthropogenic mercury emission sources, which lead to higher sediment δ202Hg (−1.07 ± 0.69‰, 1 SD) than pre‐industrial sediments (−1.55 ± 0.96‰, 1 SD). The positive Δ199Hg shifts were observed in 15 lake sediment cores, which have low pre‐industrial Δ199Hg (−0.20 ± 0.32‰) compared to the sediment cores with near‐zero to positive pre‐industrial Δ199Hg (0.08 ± 0.07‰). The magnitudes of δ202Hg (r2 = 0.09) and Δ199Hg (r2 = 0.20, both p > 0.05) changes from pre‐industrial to present‐day did not correlate with the magnitude of THg changes. Instead, the magnitudes of δ202Hg and Δ199Hg changes decreased with increasing pre‐industrial δ202Hg and Δ199Hg values, suggesting that the baseline mercury isotope ratios play a more important role in determining the magnitude of mercury isotope changes compared to the degree of THg input. We suggest that the spatiotemporal assessments of δ202Hg in lake sediment cores can be used as an important proxy for monitoring changes in anthropogenic mercury sources for the Minamata Convention on Mercury.
Key Points
Positive δ202Hg shifts together with mercury concentration in lake sediment cores from pre‐industrial to present‐day period are a widespread phenomenon
Magnitudes of δ202Hg and Δ199Hg changes are determined by the pre‐industrial or baseline values in the sediment cores rather than the degree of mercury input
Sediment δ202Hg can be used as a proxy for monitoring changes in anthropogenic mercury sources for the Minamata Convention on Mercury |
Author | Lee, Ju Hyeon Yin, Runsheng Kwon, Sae Yun Kurz, Aaron Y. Nam, Seung‐Il Motta, Laura C. |
Author_xml | – sequence: 1 givenname: Ju Hyeon orcidid: 0000-0001-5070-5074 surname: Lee fullname: Lee, Ju Hyeon organization: Pohang University of Science and Technology – sequence: 2 givenname: Sae Yun orcidid: 0000-0001-8665-0327 surname: Kwon fullname: Kwon, Sae Yun email: saeyunk@postech.ac.kr organization: Yonsei University – sequence: 3 givenname: Runsheng orcidid: 0000-0001-9631-5303 surname: Yin fullname: Yin, Runsheng organization: Chinese Academy of Sciences – sequence: 4 givenname: Laura C. surname: Motta fullname: Motta, Laura C. organization: Pohang University of Science and Technology – sequence: 5 givenname: Aaron Y. surname: Kurz fullname: Kurz, Aaron Y. organization: University of Michigan – sequence: 6 givenname: Seung‐Il surname: Nam fullname: Nam, Seung‐Il organization: Korea Polar Research Institute |
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Title | Spatiotemporal Characterization of Mercury Isotope Baselines and Anthropogenic Influences in Lake Sediment Cores |
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