Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes | |
Xiangdong Li; James P. Hurley; Handong Yang; Shichang Kang; Ryan F. Lepak; David P. Krabbenhoft; Runsheng Yin; Xinbin Feng | |
刊名 | Scientific Reports |
2016 | |
期号 | 6 |
英文摘要 | The Tibetan Plateau (TP), known as the “Third Pole”, is a critical zone for atmospheric mercury (Hg) deposition. Increasing anthropogenic activities in the globe leads to environmental changes, which may affect the loading, transport and deposition of Hg in the environment. However, the deposition history and geochemical cycling of Hg in the TP is still uncertain. Our records of Hg and Hg isotopes in sediment profiles of the two largest lakes in the TP, Lake Qinghai and Nam Co, show increased Hg influx since last century, with the maximum Hg influx enrichment ratios of 5.4 and 3.5 in Lake Qinghai and Nam Co, respectively. Shifts in negative δ 202Hg in Lake Qinghai (−4.55 to −3.15‰) and Nam Co (−5.04 to −2.16‰) indicate increased atmospheric Hg deposition through rainfall, vegetation and runoff of soils. Mass independent fractionation of both even-Hg (∆ 200Hg: +0.05 to +0.10‰) and odd-Hg (∆ 199Hg: +0.12 to +0.31‰) isotopes were observed. Positive Δ 200Hg suggest high proportion of precipitation-derived Hg in the TP, whereas the positive Δ 199Hg results from Hg(II) photo-reduction. Both lakes show increasing Δ 199Hg since the 1900 s, and we conclude that with the decrease of ice duration, Hg(II) photo-reduction may have been accelerated in these TP lakes. |
学科主题 | 环境地球化学 |
语种 | 英语 |
公开日期 | 2017-06-15 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn:8080/handle/352002/6159] |
专题 | 地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 |
推荐引用方式 GB/T 7714 | Xiangdong Li,James P. Hurley,Handong Yang,et al. Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes[J]. Scientific Reports,2016(6). |
APA | Xiangdong Li.,James P. Hurley.,Handong Yang.,Shichang Kang.,Ryan F. Lepak.,...&Xinbin Feng.(2016).Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes.Scientific Reports(6). |
MLA | Xiangdong Li,et al."Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes".Scientific Reports .6(2016). |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论