摘要
偏远地区冰雪化学可以揭示人类活动对环境的影响状况.为了解人类活动是否对青藏高原东部地区冰雪中痕量元素造成了污染,于2020年10月在阿尼玛卿山唯格勒当雄冰川上部采集了1.7 m雪坑样品,并利用ICP-MS对这些样品中Cu、Cr、Co、Zn、As、Mo、Cd、Pb、Ni等9种痕量元素进行了分析.结果表明,除Mo、Cd、Zn外,其余痕量元素表现出季风期浓度低、非季风期浓度较高的季节特征.通过与其它地区雪冰中相关研究结果的比较,揭示出黄河源区雪坑中Mo元素含量显著高于其它研究地区,而其余痕量元素浓度处于较低水平,但黄河源区雪坑中痕量元素的年沉积通量较高.痕量元素的富集因子可用来判断人为污染源的输入情况.计算了9种痕量元素的富集因子,结果表明除Cr、Co外,其余痕量元素的富集因子季风期高于非季风期,并且Mo、As、Cd、Zn、Cr 5种痕量元素的富集因子远大于10,这表明研究区受到人类活动的影响.结合相关性分析和后向轨迹分析表明,研究区主要受西南方向气流和偏西气流的影响,黄河源区雪坑中Mo、As、Cd等以人为源输入为主的元素可能来自印度次大陆的人为污染排放,Co等以尘源输入为主的元素可能来自青藏高原西部表土和中亚干旱区.
The chemistry of snow and ice in remote areas can reveal the impacts of human activities on the environment.In order to understand whether human activities have polluted trace elements in snow and ice in the eastern Tibetan Plateau,we collected 1.7 m snow pit samples in the accumulation area of Weigele Dangxiong Glacier in the Anyemaqen Mountains in the source area of the Yellow River in October 2020.Nine trace elements including Cu,Cr,Co,Zn,As,Mo,Cd,Pb and Ni in these samples were analyzed by using ICP-MS.It was found that except Mo,Cd and Zn,the other trace elements showed the seasonal characteristics of low concentration in monsoon period and high concentration in non-monsoon period.By comparing with the relevant results of snow and ice chemistry in other regions,it was revealed that the concentration of Mo element in the snow pit in this study was significantly higher than that in other regions,while the concentration of other trace elements was at a lower level,but the annual deposition flux of trace elements in the snow pit in the source area of the Yellow River was higher.The enrichment factors of trace elements can be used to determine the input of man-made pollution sources.After calculating the enrichment factors of 9 trace elements,we found that except Cr and Co,the enrichment factors of other trace elements were higher in monsoon period than in non-monsoon period,and the enrichment factors of 5 trace elements(Mo,As,Cd,Zn and Ni)were much higher than 10,indicating that the study area was affected by human activities.Combined with correlation analysis and backward trajectory analysis,Mo,As,Cd and other elements with major anthropogenic source in the snow pit of the source area of the Yellow River might come from the Indian subcontinent,while Co and other elements with major dust source might come from the western Tibetan Plateau and the Central Asia.
作者
宋瑶
王宁练
郑奎
李松
刘泽玉
SONG Yao;WANG Ninglian;ZHENG Kui;LI Song;LIU Zeyu(Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Xi’an 710127;Institute of Earth Surface System and Hazards,College of Urban and Environmental Sciences,Northwest University,Xi’an 710127;Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第6期215-225,共11页
Acta Scientiae Circumstantiae
基金
中国科学院战略性先导科技专项(A类)(No.XDA20060201)
第二次青藏高原综合科学考察研究项目(No.2019QZKK020102)
国家自然科学基金项目(No.42130516)。
关键词
阿尼玛卿
痕量元素
富集因子
后向轨迹
Mt.Anyemaqen
trace elements
enrichment factor
backward trajectory
