Collaborative Research: Circum-Antarctic Processes from Archived Marine Sediment Cores (ANTS)

合作研究：来自存档海洋沉积物核心（ANTS）的环南极过程

• 批准号: 2224679
• 负责人: Lauren Miller
• 金额: $ 77.7万
• 依托单位: University of Virginia Main Campus
• 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: 2023-02-01 至 2027-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2224679&HistoricalAwards=false
• 关键词: Collaborative; Research; Circum; Antarctic; Processes

Sediments that collect on the seafloor provide a wealth of information about past and present environmental change. Around Antarctica, these seafloor sediments are influenced by an ice sheet that grinds and transports sediments from the continent’s interior into the surrounding ocean. Since the Last Glacial Maximum (about 20,000 years ago) when the ice sheet extended hundreds to thousands of kilometers seaward, ice has retreated inland to the configuration we observe today and left behind signatures of its growth and decline, as well as indicators of ocean change, in the seafloor sediments. Ongoing glacial and ocean processes are reflected in the characteristics of contemporary sediments, whereas older sediments beneath the seafloor offer a longer temporal perspective of changes to the ice sheet and surrounding ocean. Using data generated from archived sediment cores that are predominantly housed in the Antarctic Core Collection at Oregon State University, we aim to confirm if recent sediments clearly reflect the specific instrumental and historical field-based observations of ocean and glacial change seen in different regions of Antarctica. These modern changes will be placed into context with those recorded by sediments deposited on the seafloor hundreds to thousands of years ago.This project will explore interlinked physical, biological, and geochemical properties of seafloor sediments to address the influence of glacial and oceanographic processes on ice-proximal marine sedimentation during the 20th and 21st centuries and since the Last Glacial Maximum, with a focus on sediment fluxes, meltwater drainage, ice-rafted debris deposition, and radiocarbon chronologies. We will integrate multi-proxy analyses to interrogate the seafloor sediment record around Antarctica, targeting regions offshore of relatively fast-flowing and fast-changing glacial systems today and regions offshore of slower flowing, more stable (i.e., unchanging or relatively minimally changing) parts of the ice sheet. This work will leverage the application of new techniques and knowledge to legacy sediment cores that NSF has invested greatly in collecting and archiving. This project is led by three early-career women project investigators who seek to foster collaborative and open research practices and professional growth of the project team which will include three graduate students, numerous undergraduate students, and a postdoctoral research associate. The project team will co-produce educational materials with Math4Science, an organization that connects STEM professionals with public secondary education students and their math and science teachers through curricula; and develop and implement best practices in working with marine sediment core data through a collaboration with the Oregon State University Marine and Geology Repository and the United States Antarctic Program - Data Center.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.

在海底收集的沉积物提供了有关过去和现在环境变化的大量信息。这些海底沉积物在南极洲附近，受到冰盖的影响，该冰盖从继续内部的内部磨碎并将​​沉积物运输到周围的海洋中。自从上次冰川最大值（大约20，000年前）以来，当时冰盖延长了数百到数千公里的海，冰已被内陆撤退到我们今天观察到的配置，并留下了其生长和衰落的签名，以及海洋变化的指标。持续的冰川和海洋工艺反映在当代沉积物的特征上，而海底下面的较旧沉积物为冰盖和周围海洋的变化提供了更长的临时视角。利用俄勒冈州立大学南极核心收集中主要容纳的归档沉积物核心产生的数据，我们旨在确认最近的沉积物是否明确反映了南极不同地区的海洋和冰川变化的特定仪器和历史基于田间的观察结果。这些现代变化将与数百至数千年前沉积在海底上的沉积物记录的变化置于上下文中。该项目将探索海底沉积物的物理，生物学和地球化学特性相互联系，以解决冰川和海洋学对冰川群在20号和21个百年中的最高层次和21 stst Glac的影响，以解决冰川群的影响。融合水排水，冰碎片沉积和放射性碳年代。我们将集成多种分析，以询问南极周围的海底沉积物记录，将当今相对快速流动和快速变化的冰川系统的海上靶向冰盖部分的较稳定流量，更稳定（即，不变或相对较小的变化）。这项工作将利用NSF在收集和归档方面投入大量投资的新技术和知识的应用。该项目由三名早期职业女性项目调查人员领导，他们寻求培养项目团队的合作和开放研究实践以及专业成长，其中包括三名研究生，众多的本科生以及一名博士后研究助理。项目团队将通过MathScience共同生产教育材料，该组织通过课程将STEM专业人员与公共中学教育学生及其数学和科学老师联系起来；通过与俄勒冈州立大学海洋和地质存储库以及美国南极计划-Data Center -Data Center的合作与海洋沉积物核心数据合作的开发和实施最佳实践。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查审查的审查标准来通过评估来诚实的支持。