Impacts of Arctic freshwater export on the subpolar North Atlantic Ocean circulation

北极淡水输出对副极地北大西洋环流的影响

• 批准号: 2242033
• 负责人: Thomas Haine
• 金额: $ 46.64万
• 依托单位: Johns Hopkins University
• 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: 2023-03-15 至 2026-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2242033&HistoricalAwards=false
• 关键词: Impacts; Arctic; freshwater; export; subpolar

This study seeks to understand how the melting of Arctic ice and extra Arctic precipitation can influence the ocean currents in the North Atlantic. The study also asks how much of the Arctic meltwater and precipitation can be attributed to humans (anthropogenic influence)? The project will use verified and tested ocean models to determine the fate of Arctic water and the sources of unusually fresh water in the subpolar North Atlantic. Arctic waters will be tracked with several novel approaches, including artificial intelligence. For broader impacts, the project will provide understanding on the changes in the Arctic attributable to humans and their impact on the North Atlantic currents. These changes should influence global climate through the weakening of the climate-related Atlantic Meridional Overturning Circulation. Moreover, the project will support one graduate student and undergraduate students in research experiences. Results will be disseminated through typical academic activities and outreach to the general public.This study seeks to observe, understand and anticipate the export, propagation, and impacts of Arctic-derived fresh water on the subpolar North Atlantic. The study will identify the timing and character of the Arctic anthropogenic freshening signal in the subpolar North Atlantic through specific activities related to a) the fates of Arctic freshwater anomalies, b) the sources of subpolar North Atlantic freshwater anomalies, and c) preparations for the impacts of Arctic freshwater export on the subpolar North Atlantic. Novel tools will be applied for Eulerian anomaly tracking and Lagrangian trajectory analysis to outputs from model state estimates (ECCO, ASTE), reanalysis (ORAS5), forced high-resolution ocean model (LLC4320), and coupled projections (CESM2 LENS). For broader impacts, the project will provide understanding on the Arctic anthropogenic freshening and its impact on the subpolar North Atlantic, which influences global climate through the buoyancy-forced weakening of the Atlantic Meridional Overturning Circulation.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.

这项研究旨在了解北极冰的融化和北极额外的降水如何影响北大西洋的洋流。该研究还询问了北极融水和降水中有多少可以归因于人类（人为影响）？ 该项目将使用经过验证和测试的海洋模型来确定北极水的命运以及亚极地北大西洋异常淡水的来源。北极沃茨将被包括人工智能在内的几种新方法跟踪。就更广泛的影响而言，该项目将提供对人类活动造成的北极变化及其对北大西洋洋流影响的了解。这些变化应该会通过削弱与气候相关的大西洋经向翻转环流来影响全球气候。此外，该项目将支持一名研究生和一名本科生的研究经验。研究结果将通过典型的学术活动和推广到广大公众中进行传播。这项研究旨在观察，了解和预测北极淡水的出口，传播和对亚极地北大西洋的影响。这项研究将通过与以下方面有关的具体活动，查明北极次极北大西洋人为淡水化信号的时间和特征：a）北极淡水异常的命运; B）次极北大西洋淡水异常的来源; c）为北极淡水输出对次极北大西洋的影响做准备。新的工具将应用于欧拉异常跟踪和拉格朗日轨迹分析，以输出模型状态估计（ECCO，ASTE），再分析（ORAS 5），强制高分辨率海洋模型（LLC 4320）和耦合投影（CESM 2透镜）。对于更广泛的影响，该项目将提供对北极人为淡水化及其对北大西洋副极地的影响的理解，通过大西洋经向翻转环流的浮力减弱影响全球气候。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Seaduck: A python package for Eulerian and Lagrangianinterpolation on ocean datasets

Seaduck：用于海洋数据集欧拉和拉格朗日插值的 python 包

• DOI: 10.21105/joss.05967
• 发表时间: 2023
• 期刊: Journal of Open Source Software
• 作者: Jiang, Wenrui;Haine, Thomas W.;Almansi, Mattia
• 通讯作者: Almansi, Mattia

Polar Fresh Water in a Changing Global Climate: Linking Arctic and Southern Ocean Processes

全球气候变化中的极地淡水：连接北冰洋和南大洋过程

• DOI: 10.1175/bams-d-23-0046.1
• 发表时间: 2023
• 期刊: Bulletin of the American Meteorological Society
• 影响因子: 8
• 作者: Rabe, Benjamin;Martin, Torge;Solomon, Amy;Assmann, Karen M.;Biddle, Louise C.;Haine, Thomas;Hattermann, Tore;Haumann, F. Alexander;Jahn, Alexandra;Karpouzoglou, Theodoros
• 通讯作者: Karpouzoglou, Theodoros

A Review of Arctic–Subarctic Ocean Linkages: Past Changes, Mechanisms, and Future Projections

北极与亚北极海洋联系回顾：过去的变化、机制和未来预测

• DOI: 10.34133/olar.0013
• 发表时间: 2023
• 期刊: Ocean-Land-Atmosphere Research
• 作者: Wang, Qiang;Shu, Qi;Wang, Shizhu;Beszczynska-Moeller, Agnieszka;Danilov, Sergey;Steur, Laura;Haine, Thomas W.;Karcher, Michael;Lee, Craig M.;Myers, Paul G.
• 通讯作者: Myers, Paul G.