Collaborative Research: Constraining the Role of the Antarctic Slope Current on Tracer Exchange at the Antarctic Margin using Model Hierarchies

合作研究：利用模型层次结构约束南极坡流对南极边缘示踪剂交换的作用

• 批准号: 2319829
• 负责人: Matthew Mazloff
• 金额: $ 12.43万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 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: 2024-01-01 至 2026-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2319829&HistoricalAwards=false
• 关键词: Collaborative; Research; Constraining; Role; Antarctic

The Southern Ocean (SO) plays a dominant role in the climate system, accounting for a disproportionate amount of anthropogenic heat and carbon uptake and determining how the largest source of potential future sea level rise, the Antarctic Ice Sheet (AIS), evolves. Therefore, dynamics in the SO have an outsized role in the climate system and the trajectory of climate change and associated societal impacts. The swift westward flowing Antarctic Slope Current (ASC) that moves along the boundary between the Antarctic continental shelf and the open SO is hypothesized to influence heat delivery to Antarctic ice shelves, suggesting an important mechanism for controlling AIS melt rates and thus future sea level rise. The ASC also may act as a key gateway for the exchange of nutrients and carbon between the shelf and open SO, with implications for the marine carbon cycle and ecosystem dynamics. To constrain how the thermal and biogeochemical properties of the Antarctic shelf and open SO will evolve, a comprehensive understanding of the ASC, its variability, its role in tracer transport, and its response to internal and external climate forcing is required. Despite its hypothesized importance, beyond sub-annual timescales and at localized regions, critical knowledge gaps exist in our understanding of the ASC. The proposed research will utilize a hierarchy of state-of-the-science observationally-constrained and validated physical and biogeochemical SO state estimates and fully-coupled climate model simulations to address these existing knowledge gaps. A novel, fine-resolution Southern Ocean State Estimate (SOSE) with tidal forcing, ice shelf cavities, and thermodynamically-active ice shelves will allow for the investigation of the connection between ASC variability and ice shelf melt events. The results from this work will provide foundational knowledge on the ASC’s climatological state and structure, its variability, and its role in the evolving climate system. This research will also provide critical insight on the role that model resolution may play in ASC dynamics, a step which is vital for improving the fidelity of model simulations and future projections. In addition to engaging with the Temple University First-Generation Initiative for recruiting early career researchers, a partnership with the Compute-STEM program to develop lesson plans and teacher trainings will extend the impacts of this research project.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.

南大洋（So）在气候系统中起着主导作用，占人为的热量和碳吸收的不成比例，并确定了潜在的未来海平面上升的最大来源，即南极冰盖（AIS）如何发展。因此，SO中的动态在气候系统以及气候变化和相关社会影响的轨迹中具有巨大的作用。迅速向西流动的南极斜坡电流（ASC）沿着南极连续式架子和开放式之间的边界移动，因此假设会影响热量到南极冰架的热量，这表明了控制AIS融化速率的重要机制，从而影响了未来的海平面上升。 ASC还可以充当货架之间营养和碳交换的关键门户，并对海洋碳循环和生态系统动态产生影响。为了限制南极架子的热和生物地球化学特性，并开放了如何进化，对ASC的全面理解，其可变性，其在示踪剂运输中的作用以及其对内部和外部气候强迫的反应。尽管有假设的重要性，但除了次年的时间尺度和本地化区域外，我们对ASC的理解中仍然存在批判知识差距。拟议的研究将利用最先进的科学观察和验证的物理和生物地球化学的层次结构，因此状态估计和完全耦合的气候模型模拟来解决这些现有的知识差距。一种新颖的，高分辨率的南大洋国家估计（SOSE），具有潮汐强迫，冰架腔和热力学活性冰架，将允许ASC变异性与冰架融化事件之间的连接投资。这项工作的结果将提供有关ASC的气候状态和结构，其可变性以及其在不断发展的气候系统中的作用的基本知识。这项研究还将提供有关模型解决方案在ASC Dynamics中可能扮演的角色的关键见解，这对于改善模型模拟和未来项目的忠诚至关重要。除了与Temple University招募早期职业研究人员的第一代倡议互动外，与Compute-STEM计划制定课程计划和教师培训的合作伙伴关系还将扩展该研究项目的影响。该奖项反映了NSF的法定任务，并通过使用该基金会的知识分子功能和广泛影响来评估CRITERIA CRITERIA。