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A 700-year record of mercury in avian eggshells of Guangjin Island, South China Sea
Authors:Xu Li-Qiang  Liu Xiao-Dong  Sun Li-guang  Chen Qian-Qian  Yan Hong  Liu Yi  Luo Yu-Han  Huang Jing
Institution:a Institute of Polar Environment, University of Science and Technology of China, Hefei, Anhui 230026, China
b USTC-CityU Joint Advanced Research Center, Suzhou, Jiangsu 215123, China
Abstract:Ancient eggshells over the past 700 years were extracted from an ornithogenic sediment profile on Guangjin Island, South China Sea. Based on SEM and nitrogen isotope analyses, we determined that neither post-depositional processes nor seabirds’ dietary changes had a large influence on eggshell Hg levels. The historical change of Hg in these eggshells was reconstructed. Eggshell Hg was a marker for past Hg deposition in marine environment. The eggshell Hg showed three small peaks at around 1300AD, 1600 AD and 1700-1750AD and rapid increase since 1800 AD. Before 1970 AD the Hg deposition in the Xisha area had global distribution characteristics, with increased Hg emissions due to global anthropogenic activities in industrial times. However, after 1970 AD, a further sharp increase up to present day occurred, implying that the Hg production center had gradually shifted from Europe and America to Asia.
Keywords:Guangjin Island  South China Sea  Mercury  Eggshell  Anthropogenic pollution
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