Bottom Boundary Layer Turbulence and Abyssal Recipes (BLT Recipes)
底部边界层湍流和深渊配方(BLT 配方)
基本信息
- 批准号:NE/S001433/1
- 负责人:
- 金额:$ 113.26万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2018
- 资助国家:英国
- 起止时间:2018 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Since the seminal work of Walter Munk in the 1960s, oceanographers have believed that the upwelling of cold, abyssal waters that regulates the deep ocean's ability to sequester heat and carbon for decades to millennia (thereby shaping Earth's climate) is driven by centimetre-scale turbulent mixing associated with breaking waves in the ocean interior. Measurements of deep-ocean turbulence over the last two decades, however, starkly contest this scenario, and instead suggest that mixing by breaking waves drives *downwelling* of abyssal waters. Inspired by this conundrum, recent theoretical investigations have developed a tantalising alternative view of the role of mixing in sustaining deep-ocean upwelling. In this new view, upwelling is driven by highly localised turbulence within thin (typically tens of metres thick) layers near the seafloor, known collectively as the bottom boundary layer.In this proposal, we set out to assess the validity of this new paradigm, and figure out how it works, by obtaining the first set of concurrent, systematic measurements of (1) large-scale mixing and upwelling, (2) their interior and bottom boundary layer contributions, and (3) the processes underpinning these contributions, in a representative deep-ocean basin (the Rockall Trough, in the Northeast Atlantic). To this end, we will conduct a year-long field programme involving three research cruises, in close collaboration with a group of U.S. project partners.To measure (1), in the first cruise we will release a long-lived chemical tracer detectable at very low concentrations near the seafloor on the basin's eastern flank, where deep waters flow into the basin from the south. We will monitor how the tracer mixes and upwells as it fills the basin by sampling it at 6 and 12 months after its release, during the two subsequent cruises. To measure (2) and (3), we will adopt a two-pronged approach. First, we will assess mixing and upwelling in the ocean interior and the transition into the bottom boundary layer by deploying turbulence-measuring profilers at hundreds of sites throughout the basin, in the first and third cruises. Second, as these ship-deployed profilers are unsuitable to approach the seafloor closely, we will obtain targeted measurements of mixing and upwelling across the bottom boundary layer in two ways: (i) by conducting two 6-month-long deployments of a cluster of novel, turbulence-measuring instruments moored at the seafloor, at two sites on the basin's sloping boundary; and (ii) by performing a near-bottom release of a short-lived dye at each of the mooring deployment sites, and monitoring how the dye mixes and upwells over several days after its release.We will integrate our measurements of (1)-(3) into the design of a realistic numerical model of the circulation in the Rockall Trough, and use the model to conduct a rigorous, quantitative test of the new paradigm of ocean mixing. We expect this test to provide the first evidence of the dominance of bottom boundary layer turbulence in driving deep-ocean upwelling and, in so doing, trigger a profound transformation in our understanding and modelling of deep-ocean circulation.
项目成果
期刊论文数量(2)
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
深海混合对局部内潮汐和混合效率的敏感性
- DOI:http://dx.10.1029/2019gl085056
- 发表时间:2019
- 期刊:
- 影响因子:5.2
- 作者:Cimoli L
- 通讯作者:Cimoli L
Surface factors controlling the volume of accumulated Labrador Sea Water
控制拉布拉多海水积聚量的地表因素
- DOI:http://dx.10.5194/egusphere-2023-1564
- 发表时间:2023
- 期刊:
- 影响因子:0
- 作者:Kostov Y
- 通讯作者:Kostov Y
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Alberto Naveira Garabato其他文献
Alberto Naveira Garabato的其他文献
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{{ truncateString('Alberto Naveira Garabato', 18)}}的其他基金
Enhanced carbon export driven by internal tides over the mid-Atlantic ridge (CarTRidge)
大西洋中脊内潮汐推动碳输出增强 (CarTRidge)
- 批准号:
NE/X014355/1 - 财政年份:2024
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
The Gulf Stream control of the North Atlantic carbon sink
湾流对北大西洋碳汇的控制
- 批准号:
NE/W009528/1 - 财政年份:2023
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
Generation of the ocean's permanent pycnocline in the ice-covered Southern Ocean
在冰雪覆盖的南大洋中形成海洋永久重斜斜
- 批准号:
EP/X025136/1 - 财政年份:2022
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
DEFIANT: Drivers and Effects of Fluctuations in sea Ice in the ANTarctic
挑战:南极海冰波动的驱动因素和影响
- 批准号:
NE/W004704/1 - 财政年份:2021
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
Drivers of Oceanic Change in the Amundsen Sea (DeCAdeS)
阿蒙森海海洋变化的驱动因素 (DeCAdeS)
- 批准号:
NE/T012609/1 - 财政年份:2020
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
Dynamics of the Orkney Passage Outflow (DynOPO)
奥克尼群岛航道流出动力学 (DynOPO)
- 批准号:
NE/K013181/1 - 财政年份:2015
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
A nutrient and carbon pump over mid-ocean ridges (RidgeMix)
大洋中脊上的营养物和碳泵 (RidgeMix)
- 批准号:
NE/L003449/1 - 财政年份:2014
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
OSMOSIS: Ocean Surface Mixing, Ocean Sub-mesoscale Interaction Study
渗透:海洋表面混合、海洋次中尺度相互作用研究
- 批准号:
NE/I019999/1 - 财政年份:2012
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
The Environment of the Arctic: Climate, Ocean and Sea Ice (TEA-COSI)
北极环境:气候、海洋和海冰 (TEA-COSI)
- 批准号:
NE/I028939/1 - 财政年份:2011
- 资助金额:
$ 113.26万 - 项目类别:
Research Grant
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Submesoscale instabilities in the ocean bottom boundary layer: A new pathway for energy dissipation
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Collaborative Research: Bottom Boundary Layer Turbulence and Abyssal Recipes
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Continuing Grant
Collaborative Research: Bottom Boundary Layer Turbulent and Abyssal Recipes
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合作研究:改进底部边界层湍流和颗粒特性的观测和参数化,以进行沉积物归宿和输运建模
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