Collaborative Research: Eddy fluxes across the Southern Antarctic Circumpolar Current Front near Southeast Indian Ridge

合作研究：东南印度洋脊附近南极南部绕极流锋的涡流

• 批准号: 2023306
• 负责人: Kathleen Donohue
• 金额: $ 169.51万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-10-01 至 2025-09-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2023306&HistoricalAwards=false
• 关键词: Collaborative; Research; Eddy; fluxes; across

Ocean circulation regulates the Earth’s climate by transporting heat and carbon through the global ocean and storing heat and carbon in the deep ocean. In the Southern Ocean, the strongest current on earth, the Antarctic Circumpolar Current (ACC), distributes heat, salt, and freshwater between ocean basins. This project seeks to use moored instrumentation to quantify the exchange of heat and salt across the southernmost portion of the Antarctic Circumpolar Current (ACC) into the waters around Antarctica in a sector where the ACC fronts are in close proximity and mesoscale eddy activity is particularly high. The project coordinates US and Korean observational and modeling components. The instrumentation and modeling will expand and augment an already funded Korean program. Ship time needed to deploy and recover the instruments will be provided South Korea. Data from the moored instruments will be collected annually by telemetry via pop-up data shuttles, leaving the instruments undisturbed on the seafloor. The observations will be used to refine and verify global proxy estimates of heat fluxes. Global context for understanding the heat budget will be guided by a high-resolution numerical model.The goal of this project is to measure and diagnose ocean eddy heat fluxes in the lee of Southeast Indian Ridge in the ACC. This location stands out as one of the major ACC eddy flux hot spots and as a region where the three ACC fronts converge closely together as they encounter the ridge complex. At this hot spot, mean and eddy fluxes likely conspire to cross the breadth the ACC. The focus is upon the southernmost ACC front where existing in situ measurements are sparse and where ACC-sourced heat influences the Southern Ocean Ross and Weddell gyres and ultimately the Antarctic margin. A high-resolution numerical model will provide the larger context for proposed observations, and proxy estimates will be sought that use the existing global observing system.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.

海洋循环通过将热量和碳运输到全球海洋中，并在深海中存储热量和碳来调节地球的气候。在南大洋，地球上强的强电流，南极圆形电流（ACC），在海洋鲈鱼之间分布热，盐和淡水。该项目试图使用系泊仪器来量化在南极极性电流（ACC）中的热量和盐的交换，以在ACC前沿处于近距离且中尺度涡流活动的区域中的南极洲周围的水域中量化。该项目协调了我们和韩国的观察和建模组件。仪器和建模将扩大和增强已经资助的韩国计划。部署和恢复工具所需的船舶时间将提供韩国。系泊仪器的数据将通过遥控数据穿梭每年收集，使仪器在海底不受干扰。该观察结果将用于完善和验证热通量的全局代理估计。了解热预算的全球环境将以高分辨率的数值模型为指导。该项目的目的是测量和诊断ACC中印度山脊的Lee的海洋涡流热通量。这个位置是主要的ACC涡流热点之一，并且在遇到山脊综合体时，三个ACC前沿紧密地融合在一起的区域。在这个热点，卑鄙和涡流的磁通可能会使ACC跨越广泛。重点是最南端的ACC前沿，那里现有的原位测量很少，而ACC来源的热量影响了南洋Ross和Weddell Gyres以及最终的南极边缘。高分辨率的数值模型将为拟议的观察提供更大的背景，并且将感觉到使用现有的全球观察系统的代理估计。该奖项反映了NSF的法定任务，并被认为是通过基金会的智力优点和更广泛影响的审查标准来评估通过评估而被视为珍贵的。