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: 2224681
• 负责人: Ryan Venturelli
• 金额: $ 56.09万
• 依托单位: Colorado School of Mines
• 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=2224681&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.

海底沉积物提供了有关南极洲过去和现在环境变化的大量信息，这些海底沉积物受到冰盖的影响，自末次盛冰期以来，冰盖将沉积物从大陆内部研磨并输送到周围的海洋中。 （大约 20,000 年前）当冰盖向海延伸数百至数千公里时，冰已向内陆退缩至我们今天观察到的形状，并留下了其增长和下降的特征，以及海底沉积物中正在进行的冰川和海洋过程反映在当代沉积物的特征中，而海底下较古老的沉积物则利用存档的沉积物岩心生成的数据提供了冰盖和周围海洋变化的更长期的视角。这些沉积物主要存放在俄勒冈州立大学的南极核心收藏中，我们的目的是确认最近的沉积物是否清楚地反映了南极洲不同地区所见的海洋和冰川变化的具体仪器和历史实地观测结果。与数百至数千年前沉积在海底的沉积物所记录的记录放在一起。该项目将探索海底沉积物相互关联的物理、生物和地球化学特性，以解决冰川和海洋过程对近冰海洋沉积的影响我们将整合 20 世纪和 21 世纪以及末次盛冰期以来的沉积物通量、融水排水、冰筏碎片沉积和放射性碳年代学。多代理分析询问南极洲周围的海底沉积物记录，目标是当今流动相对较快和变化较快的冰川系统的近海区域，以及流动较慢、更稳定（即不变或相对最小变化）的冰部分的近海区域这项工作将利用新技术和知识来研究国家科学基金会在收集和归档方面投入巨资的遗留沉积物岩心。该项目由三名早期职业女性项目调查员领导，她们寻求促进合作和开放的研究实践。项目团队将包括三名研究生、多名本科生和一名博士后研究员。该项目团队将与 Math4Science 共同制作教材，Math4Science 是一个将 STEM 专业人士与公立中学教育学生及其数学联系起来的组织。和科学教师通过课程；通过与俄勒冈州立大学海洋和地质知识库以及美国南极计划数据中心合作，开发和实施处理海洋沉积物核心数据的最佳实践。该奖项反映了 NSF 的法定使命，并具有通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。