Collaborative Research: Quantifying the Residual Circulation of the Arctic Ocean

合作研究：量化北冰洋的剩余环流

• 批准号: 1603557
• 负责人: John Marshall
• 金额: $ 41.1万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1603557&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantifying; Residual; Circulation

Geostrophic eddies in the ocean transport heat, salt, and mass in much the same fashion that storms transport heat, humidity, and mass in the atmosphere. The net effect of these eddy transports has a significant impact on the mean temperature and salinity stratification and circulation of the waters of the Arctic Ocean ? their climatology. Our understanding of these eddy transport process in the Arctic Ocean is weak. This project is devoted to improving that understanding.The project contributes significantly to STEM workforce development. It will support the training of a post-doctoral associate and a graduate student. Furthermore, the principal investigators will develop a teaching module for the public ?Weather in a Tank? project - a laboratory guide for students to explore fluid dynamics experiments in a rotating frame to better understand the essential physics of atmosphere and ocean phenomena. The module will describe an instructive rotating laboratory experiment to simulate the fundamental principles at work in the Beaufort Gyre in the Arctic Ocean. The project also contributes indirectly to national security in that the mean salinity stratification of the Arctic Ocean is an important control on the fate of the Arctic sea ice cover, which influences resource development, transportation, tourism, and defense activities in the Arctic. A better understanding of eddy transport processes and their subsequent incorporation into models will improve projection of future states of the Arctic sea ice cover.This project will determine, through study of a hierarchy of models in context with observations, the degree to which geostrophic turbulence plays a central role in setting the large-scale circulation of the Beaufort Gyre (BG) of the Canadian Arctic, shaping its so-called ?Residual? circulation. It is the Residual-mean circulation that transports tracers (e.g., heat, salt,carbon) in the ocean, and this has two components: a contribution from the mean velocity (the ?Eulerian-mean? circulation), and a contribution from eddies (often called the ?bolus transport?). This decomposition has provided the essential framework for progress in understanding the fundamental dynamics and global climate implications of the Southern Ocean circulation. In this project, through study of the Residual-mean circulation and its components, fundamental dynamical processes at work in the Beaufort Gyre (BG) will be explored, including:1. analysis of the role of eddies in equilibrating the freshwater budget of the gyre, balancing the pumping down of fresh water from the surface by the action of the wind,2. examination of the role of boundary currents and seasonal forcing,3. characterization of the ?Residual-mean? circulation of the BG - distinguishing it from the ?Eulerian-mean? circulation.Significant differences between Residual and Eulerian descriptions in the BG will mean that eddies have a leading order role in tracer transport. This will have far-reaching implications for Arctic oceanography, its circulation and biogeochemistry, how we interpret and take observations in the Arctic and how we model the Arctic.

海洋传输热，盐和质量的地质涡流与暴风雨在大气中运输热量，湿度和质量的方式几乎相同。 这些涡流的净效应对北极海域的平均温度和盐度分层和循环有重大影响？他们的气候学。 我们对这些北极海洋中这些涡流运输过程的理解很弱。 该项目致力于提高这种理解。该项目为STEM劳动力发展做出了重大贡献。 它将支持培训博士后同学和研究生。 此外，主要调查人员会为公众开发一个坦克天气的教学模块吗？项目 - 学生指南探索旋转框架中流体动力学实验的实验室指南，以更好地了解大气和海洋现象的基本物理。 该模块将描述一个具有启发性的旋转实验室实验，以模拟北极海上Beaufort Gyre工作中的基本原理。 该项目还间接地为国家安全做出了贡献，因为北极海洋的平均盐度分层是对北极海冰覆盖的命运的重要控制，这影响了资源开发，运输，旅游业和北极地区的国防活动。 A better understanding of eddy transport processes and their subsequent incorporation into models will improve projection of future states of the Arctic sea ice cover.This project will determine, through study of a hierarchy of models in context with observations, the degree to which geostrophic turbulence plays a central role in setting the large-scale circulation of the Beaufort Gyre (BG) of the Canadian Arctic, shaping its so-called ?Residual?循环。是残留均值的循环系统在海洋中运输示踪剂（例如热，盐，碳），这有两个组成部分：平均速度的贡献（eulerian均值？循环），以及埃迪斯（Eddies）的贡献（通常称为“大球运输？）？这种分解为了解南方海洋循环的基本动态和全球气候影响提供了进步的基本框架。在该项目中，通过研究残留均值循环及其组成部分，将探索Beaufort Gyre（BG）工作中的基本动力学过程，包括：1。分析涡流在平衡GYRE的淡水预算中的作用，通过风的作用平衡从表面泵出淡水的水平，2。检查边界电流和季节性强迫的作用，3。 “残留均值”的表征？ BG的循环 - 将其与“ Eulerian均值”区分开？循环。在BG中残留和欧拉描述之间的显着差异将意味着涡流在示踪剂运输中具有领先的顺序作用。这将对北极海洋学，其循环和生物地球化学，我们如何解释和接受北极的观察以及我们如何模拟北极的观察，这将具有深远的影响。