北极阿拉斯加春季积雪中汞的时空分布及其来源分析  

Spatiotemporal distribution and potential sources of snow mercury in Arctic Alaska during the spring season

作　　者：倪鼎铭 康世昌 张玉兰[1,2] 窦挺峰 黄杰[2,3] 孙世威 郭军明[1] NI Dingming;KANG Shichang;ZHANG Yulan;DOU Tingfeng;HUANG Jie;SUN Shiwei;GUO Junming(State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;CAS Center for Excellence in Tibetan Plateau Earth Sciences,Beijing 100101,China;Key Laboratory of Tibetan Environment Changes and Land Surface Processes,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院,西北生态环境资源研究院冰冻圈科学国家重点实验室,甘肃兰州730000 [2]中国科学院青藏高原地球科学卓越创新中心,北京100101 [3]中国科学院青藏高原研究所环境变化与地表过程重点实验室,北京100101 [4]中国科学院大学,北京100049

出　　处：《冰川冻土》2021年第2期427-436,共10页Journal of Glaciology and Geocryology

基　　金：中国科学院前沿科学重点研究项目“北极冰冻圈变化与可持续发展”(QYZDY-SSW-DQC021);中国科学院国际伙伴计划“北极冰冻圈变化与可持续发展国际大科学计划”(131B62KYSB20180003);国家重点研发计划项目(2020YFA0608503)资助。

摘　　要：开展北极雪冰中汞分布特征及其来源的探究,不仅可以丰富冰冻圈汞生物地球化学循环的认识,而且对评估北极环境中汞的潜在暴露风险具有现实意义。在2017年4月至5月对美国阿拉斯加的积雪进行大范围样品采集,探讨了该区域积雪中汞的空间分布特征及其成因、汞的沉降后过程以及潜在来源分析。研究表明:积雪中汞的空间分布受大气汞亏损事件(AMDEs)及人为源的共同影响,毗邻北冰洋海岸(如巴罗)积雪中总汞(THg)浓度较高,接近人为源的山地表层雪中THg浓度较高。巴罗雪坑中THg浓度随深度增加呈下降趋势。积雪中主要阴阳离子与THg的相关性分析表明,阿拉斯加积雪中THg的空间分布可能主要受北冰洋海盐气溶胶以及人类活动的影响。Investigation on the distribution,post-deposition process and potential sources of mercury(Hg)in Arctic snow can not only enhance our understanding of Hg biogeochemical cycling in the cryosphere,but it is also imperative for assessing the potential exposure risk of Hg to Arctic environment. Extensive sampling of surface snow was conducted in Alaska between April and May in 2017. Spatial pattern of snow Hg distribution was discussed to explore the post-deposition process of snow Hg and its potential sources. Measurements of total mercury(THg)showed that the spatial pattern of snow Hg was governed by both atmospheric mercury depletion events(AMDEs)and nearby anthropogenic sources. The higher THg concentration was generally observed near the Arctic Ocean(such as Barrow),and the regions in which were located near the anthropogenic sources. THg concentration showed a downward trend with depth in the Barrow snowpacks. By using correlation analysis among concentrations of major anions and cations,and THg,we concluded that THg in the Alaska snow might be mainly influenced by Arctic sea salt aerosol and anthropogenic emissions.

关 键 词：总汞 积雪 时空分布 阿拉斯加 北极 

分 类 号：P426.635[天文地球—大气科学及气象学]