Collaborative Research: The Antarctic Circumpolar Current: A Conduit or Blender of Antarctic Bottom Waters?

合作研究：南极绕极流：南极底层水的管道还是混合器？

• 批准号: 2023244
• 负责人: Andrew Stewart
• 金额: $ 34.5万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2023244&HistoricalAwards=false
• 关键词: Collaborative; Research; Antarctic; Circumpolar; Current

Part 1: Because of the manner in which it is formed at high latitudes in the Antarctic ice, Antarctic Bottom Water (AABW) is the coldest, saltiest and densest water on the planet. The global circulation of is often quantified via the transport in a two-dimensional, latitude/depth coordinate space. However, AABW formation, northward flow and distribution between the Atlantic, Indian and Pacific basins are fundamentally three-dimensional processes. AABW is formed in a handful of distinct sites around the Antarctic coast, notably the southern Weddell Sea, the western Ross Sea, along the Ad´elie coast, and in Prydz Bay. AABW is one of the key components of the global ocean overturning circulation, and plays a critical role in regulating Earth's climate, on multi-decadal-to-millennial time scales. Part 2: Mapping of AABW transport to northern basins is not well constrained, with conflicting conclusions drawn in previous studies. At one extreme the ACC has been suggested to be a “conduit" that simply allows each variety of AABW to transit directly northward. At the other extreme, it has been suggested that the ACC “blends" all shelf AABW sources together before they reach the northern basins. To close the gap in understanding, this collaborative project draws on three complementary analytical tools: process-oriented modeling of AABW export across the ACC, a high-resolution global ocean model, and an observationally-constrained estimate of the global circulation. The proposed identification and mechanistic understanding of AABW pathways. This project will also advance the careers of three postdoctoral researchers and two early-career faculty members, and will continue collaborative links between the PI and a foreign investigator.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.

第1部分：由于南极冰中高纬度的形成方式，南极底水（AABW）是地球上最冷，最盐和最密集的水。通常在二维的纬度/深度坐标空间中通过传输来量化全局循环。但是，AABW的形成，北大西洋，印度和和平的鲈鱼之间的北部流量和分布是从根本上是三维过程。 AABW在南极海岸周围的少数不同地点形成，尤其是韦德尔（Weddell Sea）南部，西罗斯海（Western Ross Sea），沿着广告伊利海岸（Ad'elie Coast）和普莱兹湾（Prydz Bay）。 AABW是全球大洋推翻圈子的关键组成部分之一，并且在多年千年到千年的时间尺度上在调节地球的气候中起着至关重要的作用。第2部分：将AABW运输到北部低音的映射没有很好的限制，在先前的研究中得出了矛盾的结论。在一个极端情况下，ACC被认为是一个“导管”，仅允许每种AABW直接向北过境。在另一个极端情况下，有人提出，ACC在到达北部的低音之前将所有架子ABW汇编在一起。为了缩小理解差距，该协作项目借鉴了三种完整的分析工具：ACC跨ACC的AABW导出的过程建模，一个高分辨率的全球海洋模型，以及对全球循环的观察估计。提出的对AABW途径的识别和机械理解。该项目还将推动三名博士后研究人员和两名早期职业教师的职业生涯，并将继续PI与外国调查员之间的合作联系。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响审查标准来通过评估来支持的。

项目成果

Machine Learning‐Derived Inference of the Meridional Overturning Circulation From Satellite‐Observable Variables in an Ocean State Estimate

机器学习——从卫星推断经向翻转环流——海洋状态估计中的可观测变量

• DOI: 10.1029/2022ms003370
• 发表时间: 2023
• 期刊: Journal of Advances in Modeling Earth Systems
• 影响因子: 6.8
• 作者: Solodoch, Aviv;Stewart, Andrew L.;McC. Hogg, Andrew;Manucharyan, Georgy E.
• 通讯作者: Manucharyan, Georgy E.

Coupled Ocean–Sea Ice Dynamics of the Antarctic Slope Current Driven by Topographic Eddy Suppression and Sea Ice Momentum Redistribution

地形涡抑制和海冰动量重新分布驱动的南极坡流耦合海洋-海冰动力学

• DOI: 10.1175/jpo-d-21-0142.1
• 发表时间: 2022
• 期刊: Journal of Physical Oceanography
• 影响因子: 3.5
• 作者: Si, Yidongfang;Stewart, Andrew L.;Eisenman, Ian
• 通讯作者: Eisenman, Ian

Controls of Topographic Rossby Wave Properties and Downslope Transport in Dense Overflows

稠密溢流中地形罗斯贝波特性和下坡传输的控制

• DOI: 10.1175/jpo-d-22-0237.1
• 发表时间: 2023
• 期刊: Journal of Physical Oceanography
• 影响因子: 3.5
• 作者: Han, Xianxian;Stewart, Andrew L.;Chen, Dake;Liu, Xiaohui;Lian, Tao
• 通讯作者: Lian, Tao

Bathymetric Control of Subpolar Gyres and the Overturning Circulation in the Southern Ocean

南大洋副极地环流和翻转环流的测深控制

• DOI: 10.1175/jpo-d-21-0136.1
• 发表时间: 2022
• 期刊: Journal of Physical Oceanography
• 影响因子: 3.5
• 作者: Wilson, Earle A.;Thompson, Andrew F.;Stewart, Andrew L.;Sun, Shantong
• 通讯作者: Sun, Shantong

On the Role of Bottom Pressure Torques in Wind-Driven Gyres

风驱动环流中底部压力扭矩的作用

• DOI: 10.1175/jpo-d-20-0147.1
• 发表时间: 2021
• 期刊: Journal of Physical Oceanography
• 影响因子: 3.5
• 作者: Stewart, Andrew L.;McWilliams, James C.;Solodoch, Aviv
• 通讯作者: Solodoch, Aviv