Collaborative Research: The Role of Ice Sheet Instability in Marine Carbon and Nutrient Cycling in the Eurasian Arctic

合作研究：冰盖不稳定在欧亚北极海洋碳和养分循环中的作用

• 批准号: 2231936
• 负责人: Ellen Martin
• 金额: $ 19.81万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2231936&HistoricalAwards=false
• 关键词: Collaborative; Research; Role; Ice; Sheet

The Arctic is experiencing some of the fastest and most dramatic changes on Earth in response to human-caused carbon dioxide emissions, including rapid reduction of sea ice, retreat of glaciers, and changing ocean circulation patterns. These changes are fundamentally re-organizing Arctic marine carbon and nutrient cycles. The long-term impacts on these cycles are unclear. This project will help us understand how glacial instability impacts ecosystems and ocean chemistry, with potential implications for future changes in Greenland and the Canadian Arctic. We will use this project to create educational activities designed to “bring the polar regions to the Southern and Midwest US.” Teaching about Arctic change provides a unique chance to teach students and the general public about the impacts of human-caused climate change. We will also provide research opportunities and mentor students who will help make up the next generation of polar scientists. This project will use the sedimentary record from marine sediments to investigate the links between climate change events and the land-sea-ice exchange pathways of carbon and nutrients within the Eurasian Arctic margin over the past 160 thousand years. The sedimentary record from locations on the Yermak Plateau and Barents Sea slope documents significant perturbations to carbon and nutrient cycles including multiple abrupt sediment delivery events with distinct geochemical and sedimentological compositions. We will determine the source and impact of these sediment events to evaluate how marine carbon and nutrient cycles are perturbed by glacial retreat and instability. This project will use clay mineralogy and geochemical (radiogenic isotopes) techniques to reconstruct the changing sources of sediments through time. We will compare these results with geochemical records of carbon and nutrient cycling to determine the impacts of a changing sediment source. At Kent State, project data will be incorporated into new and existing undergraduate curriculum. At UF, polar marine activities will be incorporated into a Florida Museum of Natural History open house.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.

北极正在经历地球上一些最快，最引人注目的变化，这是对人为引起的二氧化碳排放的响应，包括迅速减少海冰，冰川的撤退以及改变海洋循环模式。这些变化从根本上重新组织了北极海洋碳和营养周期。对这些周期的长期影响尚不清楚。该项目将有助于我们了解冰川不稳定如何影响生态系统和海洋化学，对格陵兰和加拿大北极的未来变化产生潜在影响。我们将使用该项目来创建旨在“将极地地区带到南部和中西部的教育活动”。关于北极变化的教学为教会学生和公众关于被人为引起的气候变化的影响提供了独特的机会。我们还将提供研究机会和精神学生，他们将帮助构成下一代的极地科​​学家。该项目将利用海洋沉积物的沉积记录来研究气候变化事件与欧亚北极边缘内碳和养分的土地冰和营养途径之间的联系。来自Yermak高原和Barents Sea Slope的地点的沉积记录记录了对碳和养分周期的重要扰动，包括具有不同的地球化学和沉积学组成的多个突然的沉积物递送事件。我们将确定这些沉积物事件的来源和影响，以评估冰川静修和不稳定性如何扰动海洋碳和营养周期。该项目将使用粘土米拉学和地球化学（放射异位同位素）技术来随着时间的推移重建变化的沉积物来源。我们将将这些结果与碳和营养循环的地球化学记录进行比较，以确定不断变化的沉积物来源的影响。肯特州，项目数据将纳入新的和现有的本科课程中。在UF，Polar Marine活动将被纳入佛罗里达自然历史博物馆开放日。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响标准，被视为通过评估来获得珍贵的支持。