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Spatiotemporal Characterization of Mercury Isotope Baselines and Anthropogenic Influences in Lake Sediment Cores

Cited 3 time in wos
Cited 3 time in scopus
Title
Spatiotemporal Characterization of Mercury Isotope Baselines and Anthropogenic Influences in Lake Sediment Cores
Other Titles
호수퇴적물 코어에서 산출되는 수은 동위원소의 시공간적 특성 및 인간간섭에 의한 영향
Authors
Lee, Ju Hyeon
Kwon, Sae Yun
Yin, Runsheng
Motta, Laura C.
Kurz, Aaron Y.
Nam, Seung-il
Subject
Environmental Sciences & EcologyGeologyMeteorology & Atmospheric Sciences
Keywords
Mercury isotopesediment coreanthropogenicbaselineMinamata Convention
Issue Date
2021-10
Citation
Lee, Ju Hyeon, et al. 2021. "Spatiotemporal Characterization of Mercury Isotope Baselines and Anthropogenic Influences in Lake Sediment Cores". GLOBAL BIOGEOCHEMICAL CYCLES, 35(10): 1-15.
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 delta Hg-202 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 delta Hg-202 (-1.07 +/- 0.69 parts per thousand, 1 SD) than pre-industrial sediments (-1.55 +/- 0.96 parts per thousand, 1 SD). The positive Delta Hg-199 shifts were observed in 15 lake sediment cores, which have low pre-industrial Delta Hg-199 (-0.20 +/- 0.32 parts per thousand) compared to the sediment cores with near-zero to positive pre-industrial Delta Hg-199 (0.08 +/- 0.07 parts per thousand). The magnitudes of delta Hg-202 (r(2) = 0.09) and Delta Hg-199 (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 delta Hg-202 and Delta Hg-199 changes decreased with increasing pre-industrial delta Hg-202 and Delta Hg-199 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 delta Hg-202 in lake sediment cores can be used as an important proxy for monitoring changes in anthropogenic mercury sources for the Minamata Convention on Mercury.
URI
https://repository.kopri.re.kr/handle/201206/13609
DOI
http://dx.doi.org/10.1029/2020GB006904
Type
Article
Station
기타(Literature dtat set)
Indexed
SCIE
Appears in Collections  
2021-2021, Vulnerability and resilience of the Arctic Svalbard to climate variability (21-21) / Nam, Seung-il (PN21013)
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