OPP-PRF: The Marginal Ocean Zone: Definition, Dynamics, and Implications for a Changing Arctic Ocean through Model-Observation Synthesis

OPP-PRF：边缘海洋区：定义、动态以及通过模型观测综合对北冰洋变化的影响

• 批准号: 2219147
• 负责人: Astrid Pacini
• 金额: $ 21.33万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2219147&HistoricalAwards=false
• 关键词: OPP; PRF; Marginal; Ocean; Zone

The Arctic Ocean is one of the most rapidly changing regions of the World Ocean. Specifically, the Seasonal Ice Zone, which is the area covered by sea ice in winter but not in summer, is growing. As this area grows, the physical processes that influence ocean motion and ocean properties like temperature, salinity, and stratification are changing. These changing physics influence net primary productivity, air-sea gas exchange, as well as processes up the trophic levels, including impacting native communities, local fisheries, and global shipping patterns. However, it is challenging to take measurements of the ocean in this region. This research will combine all available data to determine the important physical processes responsible for ocean motion and properties in the Seasonal Ice Zone. This will advance current understanding of ocean-dynamics in the vicinity of the ice edge, and thus will influence current understanding on a host of interdisciplinary topics related to Arctic Ocean and sea ice change.Significant work has been done to characterize a sub-region of the Seasonal Ice Zone known as the Marginal Ice Zone, which represents the region within the 15% ice concentration contour. This definition, however, is ice-centric. This project will approach the question from an ocean perspective. The researchers hypothesize the existence of the Marginal Ocean Zone, a region of the ocean which exhibits distinct dynamics from both the Marginal Ice Zone and the open ocean. This research will characterize the hydrographic conditions across spatio-temporal scales in this region of the Arctic Ocean. Specifically, the project will synthesize all available data to derive a universal definition for the Marginal Ocean Zone based on ocean properties like temperature, salinity, and stratification. This project will then quantify the seasonal evolution of properties within the Marginal Ocean Zone as well as the regional differences in these dynamics. Subsequently, the project will quantify the importance of synoptic scale processes and atmospheric forcing on the mixed layer dynamics, as well as on the heat and freshwater content of the Marginal Ocean Zone. Long-term changes within the Arctic Ocean are influencing circulation patterns, dynamics, and climatic-scale feedbacks. This work will diagnose, quantify, and explain long-term changes within the Marginal Ocean Zone.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.

北冰洋是世界海洋中变化最快的区域之一。具体来说，季节性冰区，即冬季被海冰覆盖但夏季没有的区域，正在增长。随着这一区域的增长，影响海洋运动和海洋性质的物理过程，如温度，盐度和分层正在发生变化。这些变化的物理影响净初级生产力，海气交换，以及营养水平的上升过程，包括影响土著社区，当地渔业和全球航运模式。然而，在这一地区对海洋进行测量具有挑战性。这项研究将联合收割机结合所有可用的数据，以确定负责海洋运动和季节性冰区的属性的重要物理过程。这将促进目前的海洋动力学在冰边缘附近的理解，从而将影响目前的理解上的一系列跨学科的主题有关北冰洋和海冰changes.Significant工作已经完成，以表征一个子区域的季节性冰区被称为边缘冰区，这代表了该地区内的15%的冰浓度等值线。然而，这个定义是以冰为中心的。这个项目将从海洋的角度来处理这个问题。研究人员假设存在边缘海洋区，这是一个海洋区域，它表现出与边缘冰区和开阔海洋不同的动态。这项研究将描述北冰洋这一区域在时空尺度上的水文条件。具体而言，该项目将综合所有可用数据，根据温度、盐度和分层等海洋特性得出边缘海洋区的通用定义。然后，该项目将量化边缘海洋区内的属性的季节性演变以及这些动态的区域差异。随后，该项目将量化天气尺度过程和大气强迫对混合层动态以及边缘海洋区热量和淡水含量的重要性。北冰洋内部的长期变化正在影响环流模式、动力学和气候尺度的反馈。这项工作将诊断、量化和解释边缘海洋区的长期变化。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。