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: 2319828
• 负责人: Rebecca Beadling
• 金额: $ 59.49万
• 依托单位: Temple University
• 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=2319828&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，它吸收了大量的人为热量和碳，并决定了未来海平面上升的最大来源——南极冰盖（AIS）的演变。 ，SO的动态在气候系统和气候变化轨迹以及相关的社会影响中发挥着巨大的作用，沿着南极大陆架和开阔的SO之间的边界快速向西流动的南极坡流（ASC）。旨在影响南极冰架的热量输送，这表明了控制 AIS 融化速率的重要机制，因此 ASC 也可能成为大陆架和开放 SO 之间营养物和碳交换的关键门户。对海洋碳循环和生态系统动态的影响。为了限制南极大陆架和开放SO的热和生物地球化学特性的演变，需要全面了解ASC、其变异性、其在示踪剂运输中的作用及其对内部的响应。和外部气候强迫尽管其重要性受到重视，但在次年时间尺度和局部区域之外，我们对 ASC 的理解仍存在关键知识差距。和生物地球化学 SO 状态估计和完全耦合的气候模型模拟，以解决这些现有的知识差距，包括潮汐强迫、冰架空腔和热力学活跃冰的新颖、高分辨率的南大洋状态估计 (SOSE)。这项工作的结果将为ASC的气候状态和结构、其变化及其在气候系统演变中的作用提供基础知识。还提供了关于模型分辨率在 ASC 动力学中可能发挥的作用的重要见解，这对于提高模型模拟和未来预测的保真度至关重要。与的伙伴关系用于制定课程计划和教师培训的计算 STEM 计划将扩大该研究项目的影响。该奖项反映了 NSF 的法定使命，并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。