Travel expenses for the study of mercury cycling in the high Arctic

汞（Hg）是一种全球性污染物，仍然是北美有关鱼类消费的政府咨询的主要原因。在极地日出时，它也大量沉积在北极高纬度地区，并被纳入北极食物链，对北方社区构成威胁。决定汞在水生系统中命运的关键步骤包括影响水中甲基汞（MeHg）稳定性的过程以及汞对藻类和甲基化细菌的生物利用度。我提出了一项研究计划，通过结合实验室和实地研究，在北方环境中解决这一系列事件中的一些关键知识空白。我的建议的长期目标是：1)评估汞光去甲基化在水生系统中的重要性，并探索其与光氧化还原反应的联系；2)将汞的氧化还原化学与汞的生物利用度联系起来；3)评价生物硫醇在汞氧化还原化学和生物利用度中的作用。“北方补充”拨款将用于支付在北极高纬度地区进行研究的一些额外费用。具体来说，它将用于支付蒙特利尔和雷索卢特湾之间的两张往返机票以及相关货物的部分年度费用。这项研究将在Resolute湾地区和极地绿洲True Love Lowlands进行。我们计划培训来自雷索莱特湾社区的两名因纽特人进行科学环境采样。我们还计划通过年度报告用因纽特图克语交流我们的研究，并与Resolute湾和Griese峡湾社区互动，以分享科学和传统知识。

Mercury (Hg) is a global pollutant that remains the main cause of governmental advisories related to fish consumption in North America. It is also massively deposited in the high Arctic during polar sunrise, and is incorporated in Arctic food chains, posing a threat to northern communities. Key steps dictating the fate of Hg in aquatic systems include processes affecting methylmercury (MeHg) stability in water and Hg bioavailability towards algae and methylating bacteria. I propose a research program that will tackle some critical gaps of knowledge in this sequence of events, through a combination of laboratory and field studies, in northern environments. The long term objectives of my proposal are: 1) to assess the importance of Hg photodemethylation in aquatic systems and explore its link to photoredox reactions; 2) to link Hg redox chemistry to Hg bioavailability; 3) to assess the role of biogenic thiols in Hg redox chemistry and bioavailability. The Northern Supplement grant will be used to cover some extra cost of doing research in the high Arctic. Specifically, it will be used to cover part of the annual cost of two return tickets between Montreal and Resolute Bay, and associated cargo. The research will be conducted in the Resolute Bay area and on True Love Lowlands, a polar oasis. We plan to train two Inuit from the Resolute Bay community in scientific environmental sampling. We also plan to communicate our research in Inuktituk through annual reports, and to interact with the communities of Resolute Bay and Griese Fjord, in order to share scientific and traditional knowledge.