Dynamics of the Orkney Passage Outflow (DynOPO)

奥克尼群岛航道流出动力学 (DynOPO)

基本信息

批准号：
NE/K013181/1
负责人：
Alberto Naveira Garabato
金额：
$ 60.01万
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2015
资助国家：
英国
起止时间：
2015 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FK013181%2F1
关键词：
Dynamics Orkney Passage Outflow DynOPO

项目摘要

During the last three decades, the Antarctic Botttom Water (AABW) filling the bulk of the global ocean abyss has exhibited a striking warming and contraction in volume over much of the world ocean, particularly in the Atlantic basin. While the causes of these changes are unknown, available evidence suggests that, in the Atlantic Ocean, the warming and contraction of AABW may be caused by changes in winds over the northern Weddell Sea, where much AABW is produced. This hypothesis asserts that those winds regulate the volume and temperature of the AABW exported northward via the Orkney Passage (a major AABW exit route from the Weddell Sea) by altering the intensity of the turbulent mixing between AABW and overlying warmer waters in the passage.In this proposal, we set out to test and, if necessary, redefine this hypothesis by:(1) carrying out the first systematic measurements of how AABW flows through the Orkney Passage, how its properties change along the way, and what processes are important in determining the AABW flow and transformation in the passage;(2) determining how and why the flux and properties of AABW in the Orkney Passage respond to wind forcing on time scales of up to several years.To address task (1) above, we will measure the velocity and properties of AABW and the intensity of turbulent mixing at several key locations in the passage. The observations will be obtained both with instruments lowered to the seabed from a ship and with a novel autonomous underwater vehicle, which is particularly effective at measuring a range of potentially crucial processes occurring near the ocean floor. To address task (2), we will enhance an array of moorings recently deployed in the Orkney Passage by the British Antarctic Survey to monitor the flux and properties of AABW. We will equip the moorings with sufficient oceanographic instrumentation to identify the processes determining the AABW's response to wind forcing, which are not resolved by the present array.We will use our findings from tasks (1) and (2) to define how and why the volume and properties of the AABW escaping the Weddell Sea through the Orkney Passage react to changes in winds. Armed with this new understanding, we will revisit the widespread AABW warming and contraction observed over recent decades, and inform the international strategy to monitor future changes in AABW circulation.

在过去的三十年中，南极的葡萄干水（AABW）填充了大部分全球海洋深渊，在世界大部分地区，尤其是在大西洋盆地上都表现出惊人的变暖和收缩。尽管这些变化的原因尚不清楚，但可用的证据表明，在大西洋中，AABW的变暖和收缩可能是由于北韦德尔海的风变化而引起的，在那里产生了许多AABW。这一假设断言，这些风通过奥克尼通道（Orkney Passage）向北导出的AABW的体积和温度，通过改变AABW和在通道中的驱动器中的湍流混合的强度，通过改变AABW的湍流混合的强度，从而进行了测试，以确保该系统的范围，我们开始使用该系统的范围。 AABW flows through the Orkney Passage, how its properties change along the way, and what processes are important in determining the AABW flow and transformation in the passage;(2) determining how and why the flux and properties of AABW in the Orkney Passage respond to wind forcing on time scales of up to several years.To address task (1) above, we will measure the velocity and properties of AABW and the intensity of turbulent mixing at several段落中的关键位置。这些观察结果将通过从船上降低到海床的仪器以及新型的自动水下车辆来获得，这在测量海底附近发生的一系列潜在至关重要的过程中特别有效。为了解决任务（2），我们将增强最近在英国南极调查的Orkney通道中部署的一系列系泊设备，以监视AABW的通量和财产。 We will equip the moorings with sufficient oceanographic instrumentation to identify the processes determining the AABW's response to wind forcing, which are not resolved by the present array.We will use our findings from tasks (1) and (2) to define how and why the volume and properties of the AABW escaping the Weddell Sea through the Orkney Passage react to changes in winds.凭借这种新的理解，我们将重新审视最近几十年来观察到的广泛的AABW变暖和收缩，并告知国际战略，以监视AABW循环中未来的变化。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Sensitivity of Deep Ocean Mixing to Local Internal Tide Breaking and Mixing Efficiency

DOI：
10.1029/2019gl085056
发表时间：
2019-12
期刊：
Geophysical Research Letters
影响因子：
5.2
作者：
L. Cimoli;Colm‐cille P. Caulfield;H. Johnson;D. Marshall;A. Mashayek;A. N. Naveira Garabato;C. Vic
通讯作者：
L. Cimoli;Colm‐cille P. Caulfield;H. Johnson;D. Marshall;A. Mashayek;A. N. Naveira Garabato;C. Vic

Circulation, retention, and mixing of waters within the W eddell- S cotia C onfluence, S outhern O cean: The role of stratified T aylor columns

南大洋韦德尔-斯科舍交汇处的水的循环、滞留和混合：分层泰勒柱的作用

DOI：
10.1002/2014jc010462
发表时间：
2015
期刊：
Oceans
影响因子：
0
作者：
Meredith M
通讯作者：
Meredith M

Mixing and Transformation in a Deep Western Boundary Current: A Case Study

西部深层边界流中的混合与转变：案例研究

DOI：
10.1175/jpo-d-20-0132.1
发表时间：
2021
期刊：
JOURNAL OF PHYSICAL OCEANOGRAPHY
影响因子：
3.5
作者：
Spingys Carl P.
通讯作者：
Spingys Carl P.

The Weddell Gyre, Southern Ocean: Present Knowledge and Future Challenges

DOI：
10.1029/2018rg000604
发表时间：
2019-09-01
期刊：
REVIEWS OF GEOPHYSICS
影响因子：
25.2
作者：
Vernet, M.;Geibert, W.;Verdy, A.
通讯作者：
Verdy, A.

Rapid mixing and exchange of deep-ocean waters in an abyssal boundary current

DOI：
10.1073/pnas.1904087116
发表时间：
2019-07-02
期刊：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
影响因子：
11.1
作者：
Garabato, Alberto C. Naveira;Frajka-Williams, Eleanor E.;Meredith, Michael P.
通讯作者：
Meredith, Michael P.