权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The Dynamics behind Subinertial Variability along the Southeast Greenland Coast

格陵兰岛东南海岸次惯性变率背后的动力学

基本信息

批准号：
1756863
负责人：
Renske Gelderloos
金额：
$ 40.14万
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：
2018
资助国家：
美国
起止时间：
2018-09-15 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1756863&HistoricalAwards=false
关键词：
Dynamics behind Subinertial Variability along

项目摘要

Oceanic circulation along the southeast Greenland coast has climate impacts of global significance. The spillage of dense water over the Denmark Strait sill into the main North Atlantic basin, contributes to a global circulation that distributes heat over the globe. In addition, warm water from the deep Atlantic basin intrudes into the cold fjords along the Greenland coast, where it melts glaciers and thus contributes to global sea level rise and potentially to changes in the regional ocean circulation. The intensity of these flows varies with a frequency of several days and the cause of this variability is not known. The main goal of this project is to determine the underlying dynamics causing this variability, and specifically the role played by waves known as coastal-trapped waves. Shedding light on what causes this dominant mode of variability, this work will aid to improve climate predictions and help design observational monitoring programs in the region. The results from this work will benefit physical oceanographers and climate scientists, as it will provide a fundamental understanding of variability in key climatic processes operating in Greenland. The project will support a female early career scientist, the training of a graduate student in numerical ocean modeling, and undergraduate student education through the development of individual research projects. Mid-depth and deep exchange flows along the southeast Greenland coast play a key role in the global climate system. Recent observational evidence of two such exchange flows (the deep Denmark Strait Overflow and fjord-shelf exchange in the mid-depth range) suggests that they are both governed by sub-inertial variability (time scale of several days). Furthermore, our preliminary results suggest that variability in the Denmark Strait Overflow and fjord-shelf exchange along the southeast Greenland coast are connected, which leads us to propose that they should be studied holistically. Despite sub-inertial variations being ubiquitous along the southeast Greenland coast, the underlying dynamics of these variations are not clear. We hypothesize that they are the imprint of coastal-trapped waves, and will study their properties, forcing mechanisms and impact on exchange flows using a combination of realistic high-resolution numerical model simulations and idealized process studies, synthesized with existing observations.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.

格陵兰东南海岸沿着的海洋环流具有全球意义的气候影响。稠密的水溢出丹麦海峡底流入北大西洋主要海盆，形成了一个全球环流，将热量分布在地球仪上。此外，来自大西洋深海盆地的暖水侵入沿着格陵兰海岸的寒冷峡湾，使冰川融化，从而造成全球海平面上升，并可能改变区域海洋环流。这些流动的强度以几天的频率变化，这种变化的原因尚不清楚。该项目的主要目标是确定导致这种变化的潜在动力学，特别是被称为海岸捕获波的波浪所扮演的角色。这项工作将有助于改善气候预测，并帮助设计该地区的观测监测计划。这项工作的结果将使物理海洋学家和气候科学家受益，因为它将提供对格陵兰关键气候过程变异性的基本了解。该项目将支持一名女性早期职业科学家，培训一名海洋数值建模研究生，并通过制定个人研究项目来教育本科生。格陵兰东南海岸沿着的中、深层交换流在全球气候系统中起着关键作用。最近观察到的两个这样的交换流（深丹麦海峡溢出和峡湾-陆架交换在中等深度范围）的证据表明，它们都是由亚惯性变化（时间尺度为几天）。此外，我们的初步研究结果表明，在丹麦海峡溢出和峡湾-陆架交换沿着格陵兰岛东南部海岸的变化是连接，这使我们建议，他们应该进行整体研究。尽管亚惯性变化在格陵兰东南部海岸沿着普遍存在，但这些变化的潜在动力学尚不清楚。我们假设它们是海岸捕获波的印记，并将使用现实的高分辨率数值模型模拟和理想化过程研究相结合来研究它们的特性、强迫机制和对交换流的影响，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进行评估，被认为值得支持的搜索.