Spatiotemporal Characterization of Mercury Isotope Baselines and Anthropogenic Influences in Lake Sediment Cores
Ju Hyeon Lee, Sae Yun Kwon, Runsheng Yin, Laura C. Motta, Aaron Y. Kurz, Seung‐Il Nam
Abstract
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 δ 202 Hg 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 δ 202 Hg (−1.07 ± 0.69‰, 1 SD) than pre‐industrial sediments (−1.55 ± 0.96‰, 1 SD). The positive Δ 199 Hg shifts were observed in 15 lake sediment cores, which have low pre‐industrial Δ 199 Hg (−0.20 ± 0.32‰) compared to the sediment cores with near‐zero to positive pre‐industrial Δ 199 Hg (0.08 ± 0.07‰). The magnitudes of δ 202 Hg ( r 2 = 0.09) and Δ 199 Hg ( r 2 = 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 δ 202 Hg and Δ 199 Hg changes decreased with increasing pre‐industrial δ 202 Hg and Δ 199 Hg 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 δ 202 Hg in lake sediment cores can be used as an important proxy for monitoring changes in anthropogenic mercury sources for the Minamata Convention on Mercury.