Collaborative Research: Holocene biogeochemical evolution of Earth's largest lake system

合作研究：地球最大湖泊系统的全新世生物地球化学演化

• 批准号: 2336132
• 负责人: Anthony Chappaz
• 金额: $ 42.98万
• 依托单位: Central Michigan University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-03-01 至 2027-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2336132&HistoricalAwards=false
• 关键词: Collaborative; Research; Holocene; biogeochemical; evolution

The ongoing human impacts on the Great Lakes are well known. These impacts include climate change, pollution, nutrient loading, development, and invasive species. However, the evolution of the Great Lakes before these human impacts due to natural climate change events since their formation at the end of the last ice age is less understood. This study will be among the first to investigate elemental geochemical cycles in the Great Lakes. These cycles reflect biologic activity such as productivity and oxygen contents over geologic time. This work will involve collecting sediment cores from Lakes Superior, Huron, and Erie. A variety of element and isotope concentrations will be measured in these sediments to assess past lake conditions. This project will support graduate and undergraduate students at both Michigan State University and Central Michigan University as well. The team will conduct outreach to Michigan K-12 schools and local communities working with established organization like Michigan Sea Grant and the Thunder Bay National Marine Sanctuary on Lake Huron.This project will collect piston cores of sediment from 6 Great Lakes sites— 2 from each of Lake’s Superior, Huron, and Erie—to investigate the local and regional Holocene biogeochemical cycling and its insights into ongoing anthropogenic perturbations and climate change. Our sites are targeted because they span a gradient in trophic conditions and water residence times and include among the best studied and highest interest sites in the modern—the currently naturally hypoxic Middle Island Sinkhole of Lake Huron, the seasonally hypoxic Central and Eastern Basins of Lake Erie, and the Western and Eastern Mooring sites of Lake Superior. Specific objectives include: (A) How has natural climate change impacted productivity and the behavior of bioessential trace elements through the Holocene? (B) How has natural climate change impacted redox conditions through the Holocene? (C) Do intra and inter-lake heterogeneity reflect larger regional environmental feedbacks? (D) What role do diagenesis and other local variations play in proxy dynamics at each site? These questions will be addressed using geochemical proxies, including mercury isotopes, nutrients concentrations and their isotopes, and redox-sensitive and biologically active trace elements.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

人类对大湖区的持续影响是众所周知的。这些影响包括气候变化，污染，养分负荷，发育和入侵物种。但是，由于自然的气候变化事件，大湖区在上一个冰河时代结束时的形成以来，大湖在这些人类影响之前的演变是不了解的。这项研究将是最早研究大湖区元素地球化学周期的研究之一。这些循环反映了生物学活性，例如生产力和地质时间的氧含量。这项工作将涉及从湖泊上级，休伦和伊利湖中收集沉积物核心。在这些沉积物中将测量各种元素和同位素浓度，以评估过去的湖泊条件。该项目将支持密歇根州立大学和中央密歇根大学的毕业生和本科生。该小组将向密歇根州K-12学校和当地社区进行宣传，与诸如休伦湖上的密歇根州海洋赠款和雷霆湾国家海洋保护区等成熟组织一起进行。该项目将从6个大湖区收集活塞岩心，其中2个来自湖上的高级，休伦和埃里的每个湖泊，以调查当地和地区的杂物，并涉及整个杂物，并涉及整个杂物，并扎根于洞察力，并扎根于洞察力，并扎根于洞察力，并进行了洞察力，并扎根于洞察力，并进行了洞察力，并探索了洞察力和局面的杂物，并探索了洞察力，并涉及洞察力，并涉及到洞察力的杂物，并涉及洞察力和局面的杂物和地区和兴趣。气候变化。我们的站点之所以成为目标，是因为它们跨越了营养状况和水位时间的梯度，包括现代的最佳研究类和非常有趣的地点之一 - 当前自然是休伦湖的中岛矿山，伊利湖季节性低氧中央和东方盆地，以及西奥里湖的西部和东部泥矿地点。特定对象包括：（a）自然气候变化如何影响生产力和通过全新世生物质量元素的行为？ （b）自然气候变化如何通过全新世影响氧化还原条件？ （c）内部和湖间异质性是否反映了更大的区域环境反馈？ （d）在每个站点的代理动力学中，成岩作用和其他局部变化在何种作用？这些问题将使用地球化学代理来解决，包括汞同位素，营养浓度及其同位素，以及对氧化还原敏感的和生物学上的痕量元素。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子和更广泛的影响来审查Criteria，通过评估来诚实地通过评估来诚实地支持。