Magnetic characteristics of Qiangyong Co Lake sediments, southern Tibetan Plateau and its environmental significance during 1899-2011
GAO Xing1, KANG Shichang2, LIU Qingsong3, CHEN Pengfei2, DUAN Zongqi,1,41. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 2. State Key Laboratory of Cryospheric Science, Institute of Eco-Environment and Resources, CAS, Lanzhou 730000, China 3. Department of Marine Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China 4. The Geographical Society of China, Beijing 100101, China
National Natural Science Foundation of China.41506075 National Natural Science Foundation of China.41430962 National Natural Science Foundation of China.41574036 National Natural Science Foundation of China.41705132
作者简介 About authors 高星(1966-),男,山东济南人,研究员,博导,主要从事地震地质灾害及环境磁学方面研究E-mail:gxing@igsnrr.ac.cn。
Abstract Far from major zones of human pollution, the widely developed lakes on the Tibetan Plateau are ideal regions to evaluate global and regional impacts caused by human activities. Based on the reliable dating, they can provide historical records of human pollution. Heavy metal is one of the most harmful pollutants, and is harmful to biological environment and people's health due to its degradation-resistancy. Environmental magnetism characterized by its sensitivity, facility and non-destructiveness, has been applied widely in estimating increased heavy metal pollution in different environmental systems. However, there lacks the relevant research in lake sediments on the Tibetan Plateau. Thus, we conducted a systematic environmental magnetic investigation of lake sediments in the Qiangyong Co Lake, southern Tibetan Plateau to explore the relevance between magnetic minerals and heavy metal (Hg). Results indicate that magnetic mineral species constituted by four different components (C1, C2, C3, C4) remain stable during 1899-2011 AD, but the component C1 (hematite) increased continuously with the corresponding decrease of component C2 (goethite). In contrast, components C3 and C4 (magnetite) have no significant changes. The correlation between SIRM and Hg differs from that between χlf and Hg, probably because SIRM and χlf are affected by different factors of complex magnetic mineral species (four different components). But the component C1 is correlated well with both Hg content and climate warming of the Tibetan Plateau. This indicates that Qiangyong glacier (the main recharge source of Qiangyong Co Lake) melt faster upon the Tibetan Plateau warming, and the accumulated Hg in glacier and cryoconite were released again. During the processes, C1 (hematite) with large specific surface area absorbs Hg, and is transported to the Qiangyong Co Lake. This research indicates that the magnetic properties of the Qiangyong Co Lake are excellent environmental proxies, which can provide a new method to study the process of Hg deposition in lakes on the southern Tibetan Plateau. Keywords:southern Tibetan Plateau;Qiangyong Co Lake;lake sediments;environmental magnetism;environmental changes
PDF (4623KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 高星, 康世昌, 刘青松, 陈鹏飞, 段宗奇. 1899—2011年青藏高原南部枪勇错沉积物磁性矿物的环境意义. 地理学报[J], 2020, 75(1): 68-81 doi:10.11821/dlxb202001006 GAO Xing. Magnetic characteristics of Qiangyong Co Lake sediments, southern Tibetan Plateau and its environmental significance during 1899-2011. Acta Geographica Sinice[J], 2020, 75(1): 68-81 doi:10.11821/dlxb202001006
新窗口打开|下载原图ZIP|生成PPT 图5枪勇错沉积物特征样品的低温曲线零场冷却曲线及其一阶导数曲线(a. 实线为零场冷却曲线; 虚线为其一阶导数曲线; b. 特征样品漫反射光谱强度的二阶导数曲线)
Fig. 5Zero-field-cooling curves (a, the solid line and dashed line represent the origin data and its first derivative data of zero-field-cooling curves respectively) and the second derivative curves of diffuse reflectance spectroscopy (b) for selected samples of Qiangyong Co Lake
Fig. 6Correlations between the variations of magnetic component and Hg content of Qiangyong Co Lake and environmental indexes (annual precipitation and average temperature) of Nargaze station
注:Hg含量变化及年代数据来自文献[12];青藏高原和北半球平均温度距平数据来自文献[16]。 Fig. 7The variations of different magnetic components of Qiangyong Co Lake (a~d), annual precipitation (e) and average temperature (f) from Nargaze station, temperature anomaly of the Tibetan Plateau and the Northern Hemisphere (g), and Hg content (h)
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