Pathways to the Denmark Strait Overflow: A Lagrangian Study in the Iceland Sea

丹麦海峡溢流的路径:冰岛海的拉格朗日研究

基本信息

项目摘要

Intellectual Merit: The Denmark Strait overflow is an important contributor to the deep limb of the global Meridional Overturning Circulation. However, considerable uncertainty remains regarding the source(s) of the overflow water, and the causes of its transport and temperature/salinity variability. A better description of the dense water pathways leading to Denmark Strait through the Iceland Sea is needed to understand, and ultimately predict, changes in the overflow entering the North Atlantic Ocean.Recent studies have proposed that there are two pathways for dense water to enter the Denmark Strait: one from the Greenland Sea via the East Greenland Current, and another from the interior Iceland Sea via the North Icelandic Jet. A recent modeling study suggests that these pathways may alternate with changing wind conditions, in particular the wind stress curl in the region around Iceland. During years with high (low) wind stress curl, the East Greenland Current (North Icelandic Jet) is thought to be the dominant pathway.Subsurface Lagrangian observations, which directly measure fluid parcel pathways, are not presently available in the Iceland Sea. This project will deploy acoustically tracked floats set at a depth of 500 m, just above the sill depth of Denmark Strait, to directly observe dense water pathways in the Iceland Sea over a two-year period. A total of 35 float trajectories, tracked with an array of six sound sources, will be combined with atmospheric, hydrographic and altimetry data to define the relationship between the observed pathways and the forcing conditions during the experiment. An ocean general circulation model simulation of particle trajectories in the Iceland Sea, forced with the conditions observed during the experiment, will be compared with the float trajectories. The field work is heavily leveraged, with the Institute for Marine Research in Bergen, Norway providing the sound source array, the ship time for sound source and float deployment and about 40% of the floats. Overall, this study will help to better understand the Denmark Strait overflow and its variability as well as shed light on the general subsurface circulation of the Iceland Sea.Broader impacts: This project has bearing on the variability of the lower limb of the Meridional Overturning Circulation, and thus is relevant to the broader topic of the ocean?s role in global climate change. The research is highly collaborative with several international partners, including the Institute of Marine Research in Bergen, Norway, the Marine Research Institute in Reykjavik, Iceland and the Institute of Oceanography in Hamburg, Germany. This experiment will also provide an opportunity for an early career scientist to lead her first field project.
知识价值:丹麦海峡溢流是全球经向翻转环流深分支的重要贡献者。然而,关于溢流水的来源、溢流水的输送和温度/盐度变化的原因仍然存在相当大的不确定性。为了理解并最终预测进入北大西洋的溢流变化,需要更好地描述通过冰岛海进入丹麦海峡的密集水道。最近的研究提出,稠密的水有两条途径进入丹麦海峡:一条是通过东格陵兰洋流从格陵兰海进入,另一条是通过北冰岛急流从冰岛海进入。最近的一项建模研究表明,这些途径可能会随着风条件的变化而变化,尤其是冰岛周围地区的风应力旋度。在高(低)风应力旋度的年份,东格陵兰洋流(北冰岛急流)被认为是主要的途径。直接测量流体包裹路径的地下拉格朗日观测目前还无法在冰岛海获得。该项目将在水深500米的地方部署声学跟踪浮标,就在丹麦海峡的基础深度之上,在两年的时间里直接观察冰岛海的密集水域。由6个声源阵列跟踪的35个浮子轨迹将与大气、水文和高空数据相结合,以确定观测路径与实验期间强迫条件之间的关系。一个海洋环流模式模拟了冰岛海的粒子轨迹,在实验中观测到的条件下,将与浮子轨迹进行比较。现场工作的杠杆作用很大,挪威卑尔根海洋研究所提供声源阵列、声源和浮子部署的船舶时间以及大约40%的浮子。总的来说,这项研究将有助于更好地了解丹麦海峡溢流及其变动性,并阐明冰岛海的一般地下环流。更广泛的影响:这个项目对经向翻转环流的下肢的可变性有影响,因此与更广泛的海洋主题相关。美国在全球气候变化中的作用。这项研究与几个国际伙伴密切合作,包括挪威卑尔根海洋研究所、冰岛雷克雅未克海洋研究所和德国汉堡海洋学研究所。这个实验也将为一个早期职业科学家领导她的第一个实地项目提供机会。

项目成果

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Marieke Femke de Jong其他文献

Marieke Femke de Jong的其他文献

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{{ truncateString('Marieke Femke de Jong', 18)}}的其他基金

Pathways to the Denmark Strait Overflow: A Lagrangian Study in the Iceland Sea
丹麦海峡溢流的路径:冰岛海的拉格朗日研究
  • 批准号:
    1513375
  • 财政年份:
    2014
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant

相似海外基金

Ventilation of Denmark Strait Overflow Water in the Iceland and Greenland Seas
冰岛和格陵兰海丹麦海峡溢流水域的通风
  • 批准号:
    1558742
  • 财政年份:
    2016
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant
The Upstream Sources of the Denmark Strait Overflow
丹麦海峡溢流的上游来源
  • 批准号:
    1433958
  • 财政年份:
    2014
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant
Pathways to the Denmark Strait Overflow: A Lagrangian Study in the Iceland Sea
丹麦海峡溢流的路径:冰岛海的拉格朗日研究
  • 批准号:
    1513375
  • 财政年份:
    2014
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant
Collaborative Research: Do Holocene Variations In Arctic Sea Ice And Greenland Icebergs Drifting Through Denmark Strait Reflect Natural Cycles?
合作研究:北极海冰和格陵兰冰山漂流丹麦海峡的全新世变化是否反映了自然循环?
  • 批准号:
    1107942
  • 财政年份:
    2011
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant
Collaborative Research: Are There Natural Climate Cycles in the Holocene Variations of Arctic Sea Ice and Greenland Icebergs Across the Denmark Strait?
合作研究:丹麦海峡对面的北极海冰和格陵兰冰山的全新世变化是否存在自然气候循环?
  • 批准号:
    1107761
  • 财政年份:
    2011
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant
Denmark Strait Overflow Water: A New Paradigm for the Origin of the Deep Western Boundary Current
丹麦海峡溢流水:西深边界流起源的新范式
  • 批准号:
    0959381
  • 财政年份:
    2010
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Continuing Grant
Variability of the Denmark Strait Overflow
丹麦海峡溢流的变化
  • 批准号:
    NE/F013329/1
  • 财政年份:
    2008
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Training Grant
Collaborative Research: Shelf-Basin Exchange South of Denmark Strait: Forcing, Dynamics, and Large-Scale Impact
合作研究:丹麦海峡以南的陆架盆地交换:强迫、动力学和大规模影响
  • 批准号:
    0726393
  • 财政年份:
    2007
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Standard Grant
Collaborative Research: Shelf-Basin Exchange South of Denmark Strait: Forcing, Dynamics, and Large-Scale Impact
合作研究:丹麦海峡以南的陆架盆地交换:强迫、动力学和大规模影响
  • 批准号:
    0726640
  • 财政年份:
    2007
  • 资助金额:
    $ 75.08万
  • 项目类别:
    Continuing Grant
Evolution of the Shelfbreak Current from Denmark Strait to the Gulf Stream
从丹麦海峡到墨西哥湾流的断架流演变
  • 批准号:
    0095261
  • 财政年份:
    2001
  • 资助金额:
    $ 75.08万
  • 项目类别:
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