Lagrangian Study of the Iceland-Faroe Front. Part II: Analysis and Synthesis

冰岛-法罗锋线的拉格朗日研究。

• 批准号: 0623210
• 负责人: H. Thomas Rossby
• 金额: $ 15.56万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0623210&HistoricalAwards=false
• 关键词: Lagrangian; Study; Iceland; Faroe; Front.

ABSTRACTOCE-0623210Intellectual Merit: A Lagrangian study of the inflow of shallow and warm North Atlantic water across the Iceland-Faroe Ridge, along the Iceland-Faroe Front (IFF), and into the Norwegian Sea has previously been funded as a cooperative effort between the University of Rhode Island (URI) and the Institute of Marine Research (IMR) in Bergen, Norway. A major objective of that study was to understand the basic features of the IFF: its mean and time varying structure, from which side of the Iceland Basin its waters come, and where and how they continue downstream. Sixty floats from URI were deployed at 200 dbar to the south of the Iceland-Faroe Ridge to examine the shallow pathways of warm North Atlantic waters across the Ridge and beyond into the Norwegian Sea, and 30 floats from IMR were deployed at 800 dbar just north of the Ridge to focus on the flow of Arctic intermediate waters. These floats will have completed their mission and surfaced by the spring of 2006, and preliminary processing is expected to be complete by the end of that summer. The primary purpose of this analysis and synthesis project is to continue the original scientific objectives of the field program, but also extend those ideas to incorporate new ideas and collaborations. The RAFOS float data will be used to map the pathways, develop quantitative estimates of the transport across the Iceland-Faroes Ridge, the eddy variability in the IFF, and the exchanges and mixing with the Norwegian Sea Water to its north, and a description of the bifurcation of the IFF into the northern and southern Faroe Current. As is well-known, floats can be very effective at identifying pathways of transport and mixing, while the corresponding velocities and their variability in and along the front give information on the front's structure and downstream evolution. Broader Impacts: The analysis of these observations will enhance our understanding of the penultimate link in the northward transport of warm water in the thermohaline circulation (the final step being deep convection in the Nordic Seas). The dynamics of the ocean that controls the pathways and the transport of warm water over the Iceland- Faroes Ridge also serve to control the climate over northern Europe. The results of the RAFOS float analysis will be shared closely with collaborators, both observationalists and numerical modelers, in Norway and Sweden so that a coherent and comprehensive picture of the both the shallow and intermediate circulation can be made. All the data and results from this project will be made available to the community through submissions to data centers, presentations at national and international meetings, and publication of technical reports and scientific papers.

学术价值：一项关于北大西洋浅水和暖水流入冰岛-法罗脊、冰岛-法罗锋(IFF)和挪威海的拉格朗日研究以前是由罗德岛大学(URI)和挪威卑尔根海洋研究所(IMR)合作资助的。这项研究的一个主要目的是了解森林论坛的基本特征：其平均值和时变结构，其水域来自冰岛盆地的哪一边，以及它们继续向下游的位置和方式。在冰岛-法罗海脊以南200分巴部署了60个来自国际海洋研究所的浮标，以考察北大西洋温暖水域穿过海脊并进入挪威海的浅水航道；在海脊以北800分巴部署了来自国际海洋研究中心的30个浮标，重点关注北极中间水域的流动。这些浮标将于2006年春季完成任务并浮出水面，初步处理工作预计将于当年夏季结束前完成。这个分析和综合项目的主要目的是继续实地计划的原始科学目标，但也要扩展这些想法，以纳入新的想法和合作。RAFOS浮标数据将用于绘制路径图，对跨越冰岛-法罗海脊的输送、IFF的涡旋变化及其北部与挪威海水的交换和混合作出定量估计，并描述IFF进入北部和南部法罗海流的分叉。众所周知，漂浮物可以非常有效地确定输送和混合的路径，而锋面内和沿锋面的相应速度及其变异性提供了关于锋面结构和下游演变的信息。更广泛的影响：对这些观测结果的分析将加强我们对温盐环流中暖水向北输送的倒数第二个环节(最后一步是北欧海深对流)的理解。海洋的动态控制着冰岛-法罗斯海脊上的路径和温水的输送，也控制着北欧的气候。RAFOS浮子分析的结果将与挪威和瑞典的观测人员和数值模拟人员密切分享，以便能够对浅层环流和中间环流作出连贯和全面的图景。该项目的所有数据和成果将通过向数据中心提交、在国家和国际会议上介绍以及出版技术报告和科学论文的方式向社区提供。