Collaborative Research: Linking Marine and Terrestrial Sedimentary Evidence for Plio-pleistocene Variability of Weddell Embayment and Antarctic Peninsula Glaciation

合作研究：将海洋和陆地沉积证据联系起来，了解威德尔海湾和南极半岛冰川的上里奥-更新世变化

• 批准号: 2114763
• 负责人: Sidney Hemming
• 金额: $ 55.41万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2114763&HistoricalAwards=false
• 关键词: Collaborative; Research; Linking; Marine; Terrestrial

The potential for future sea level rise from melting and collapse of Antarctic ice sheets and glaciers is concerning. We can improve our understanding of how water is exchanged between Antarctic ice sheets and the ocean by studying how ice sheets behaved in past climates, especially conditions that were similar to or warmer than those at present. For this project, the research team will document Antarctica’s response across an interval when Earth transitioned from the warm Pliocene into the Pleistocene ice ages by combining marine and land evidence for glacier variations from sites near the Antarctic Peninsula, complimented by detailed work on timescales and fossil evidence for environmental change. An important goal is to test whether Antarctica’s glaciers changed at the same time as glaciers in the Northern Hemisphere as Earth's most recent Ice Age intensified, or alternatively responded to regional climate forcing in the Southern Hemisphere. Eleven investigators from seven US institutions, as well as Argentine collaborators, will study new sediment cores from the International Ocean Discovery Program, as well as legacy cores from that program and on-land outcrops on James Ross Island. The group embraces a vertically integrated research program that allows high school, undergraduate, graduate, post-docs and faculty to work together on the same projects. This structure leverages the benefits of near-peer mentoring and the development of a robust collaborative research network while allowing all participants to take ownership of different parts of the project. All members of the team are firmly committed to attracting researchers from under-represented groups and will do this through existing channels as well as via co-creating programming that centers the perspectives of diverse students in conversations about sea-level rise and climate change.The proposed research seeks to understand phasing between Northern and Southern Hemisphere glacier and climate changes, as a means to understand drivers and teleconnections. The dynamics of past Antarctic glaciation can be studied using the unique isotope geochemical and mineralogic fingerprints from glacial sectors tied to a well-constrained time model for the stratigraphic successions. The proposed work would further refine the stratigraphic context through coupled biostratigraphic and magnetostratigraphic work. The magnitude of iceberg calving and paths of icebergs will be revealed using the flux, geochemical and mineralogic signatures, and 40Ar/39Ar and U-Pb geochronology of ice-rafted detritus. These provenance tracers will establish which sectors of Antarctica’s ice sheets are more vulnerable to collapse, and the timing and pacing of these events will be revealed by their stratigraphic context. Additionally, the team will work with Argentine collaborators to connect the marine and terrestrial records by studying glacier records intercalated with volcanic flows on James Ross Island. These new constraints will be integrated with a state of the art ice-sheet model to link changes in ice dynamics with their underlying causes. Together, these tight stratigraphic constraints, geochemical signatures, and ice-sheet model simulations will provide a means to compare to the global records of climate change, understand their primary drivers, and elucidate the role of the Antarctic ice sheet in a major, global climatic shift from the Pliocene into the Pleistocene.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.

涉及南极冰盖和冰川的融化和崩溃的潜力。我们可以通过研究冰盖在过去的气候下的表现，尤其是与目前相似或温暖的条件，通过研究冰盖的表现，从而提高人们对南极冰盖和海洋之间如何交换水的理解。对于该项目，研究团队将通过将海洋和土地证据结合到南极半岛附近地点的冰川变化，以通过对时间表和环境变化的详细的工作证据来称赞，从而将南极的反应记录到一段时间间隔。一个重要的目标是测试南极洲的冰川是否随着地球最近的冰河时代加剧而与北半球的冰川发生变化，或者对南半球的区域气候强迫做出反应。来自美国七个机构以及阿根廷合作者的11位调查人员将研究国际海洋发现计划的新沉积物核心，以及该计划的传统核心以及詹姆斯·罗斯岛（James Ross Island）的陆上露头。该小组采用了一项垂直整合的研究计划，该计划允许高中，本科，研究生，毕业后和教职员工一起在同一项目上共同努力。这种结构利用了近点心态的好处和建立强大的协作研究网络的发展，同时允许所有参与者拥有项目的不同部分。该团队的所有成员首先致力于吸引来自代表性不足的群体的研究人员，并将通过现有渠道以及共同创建节目来实现这一目标，这将各种学生的观点集中在有关海平面上升和气候变化的对话中。拟议的研究旨在了解北部和南部半球形流度和气候变化之间的逐步逐步逐步了解，以了解有效的变化。可以使用与良好的地层延长的冰川时间模型相关的冰川扇区的独特同位素地球化学和矿物质指纹进行研究的动力学。拟议的工作将通过耦合的生物术和磁层学工作进一步完善地层环境。使用通量，地球化学和矿物质学特征以及40AR/39AR和U-PB的地球量学，将揭示冰山产犊的大小和冰山路径的大小。这些出处示踪剂将确定南极冰盖的哪些部门更容易崩溃，这些事件的时机和起搏将通过其地层环境揭示。此外，该团队将与阿根廷合作者一起工作，这些紧密的地层约束，地球化学签名和冰原模型模拟将提供一种与全球气候变化的记录相比，了解其主要驱动力的全球记录，并阐明了对大型冰期的主要气候统计的全球气候统计，并统计了peissiis staties ofis sepsfeen。使用基金会的智力优点和更广泛的影响审查标准通过评估来支持。