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The Origins and Evolution of Double-...

Bebieva, Yana.

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The Origins and Evolution of Double-diffusive Layers and Associated Heat Transport in the Arctic Ocean.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The Origins and Evolution of Double-diffusive Layers and Associated Heat Transport in the Arctic Ocean./
作者:	Bebieva, Yana.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	147 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-08, Section: B.
Contained By:	Dissertations Abstracts International80-08B.
標題:	Fluid mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13841632
ISBN:	9780438902466

The Origins and Evolution of Double-diffusive Layers and Associated Heat Transport in the Arctic Ocean.
Bebieva, Yana.

The Origins and Evolution of Double-diffusive Layers and Associated Heat Transport in the Arctic Ocean. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 147 p.

Source: Dissertations Abstracts International, Volume: 80-08, Section: B.

Thesis (Ph.D.)--Yale University, 2018.

This item must not be added to any third party search indexes.

Arctic Ocean heat transport has a central control on Arctic sea-ice cover and global climate. Motivated by the need to better understand this heat transport, this thesis addresses a type of small-scale ocean mixing, double-diffusive convection. Double-diffusive convection is widespread throughout the Arctic Ocean, and is one of the main mechanisms by which deep ocean heat is transported in the central basins. Ocean observations from the extensive Ice-Tethered Profiler dataset are analyzed in conjunction with theoretical analyses to answer several essential questions about the physical nature of double-diffusive structures and associated mixing and fluxes. Findings provide a deeper understanding of how double diffusion affects heat transport pathways in the Arctic Ocean. Double-diffusive convection gives rise to layered structures in the Arctic Ocean: double diffusive staircases and thermohaline intrusions. Two mechanisms for the origins of staircases are developed in this thesis. The first is based on a stability analysis of a perturbation to linear vertical gradients in temperature and salinity in the presence of lateral gradients. It is shown that either a staircase or thermohaline intrusions can develop via growing perturbations, with the result being a function of the strength of the temperature and salinity gradients. When a staircase forms, ocean heat is primarily transferred upward, while when thermohaline intrusions form, heat is transferred both vertically and horizontally. The results demonstrate how vertical stratification structure dictates the pathways of deep ocean heat in the central Arctic. The second mechanism developed for staircase origins is based on observations that show lateral coherence of staircase mixed layers and thermohaline intrusion layers, which are characterized by their differing along-layer temperature and salinity gradients. The analysis of these along-layer gradients and fine structure in the temperature and salinity observations indicates that a staircase can form via the run-down of thermohaline intrusions (i.e., staircases can be the remnants of intrusions). The theoretical framework in context with observations brings new understanding to how the layers evolve, and how they relate to Arctic Ocean heat and salt transport. Motivated by the increasing potential for wind-energy input to the Arctic Ocean in the face of further sea-ice losses, the persistence of double-diffusive layering and fluxes in a turbulent setting is analyzed. To this end, a unique observational case study is examined which consists of temperature and salinity measurements through double-diffusive layers that are prominent in the vicinity of an energetic warm-core mesoscale eddy. It is shown that heat in the anomalously warm eddy waters is dissipated via fluxes that are both upward (towards the sea ice) and downward (for heat archival in deeper water layers). Analysis of the double-diffusive fluxes from the eddy core and turbulent fluxes from the eddy flanks (where the effects of geostrophic velocity shear are strongest) highlights the importance of double diffusion in heat transfer from these dynamic features. Further, the study quantifies the level of turbulent activity below which double-diffusion can be active, setting important bounds on the role of double-diffusion in a potentially increasingly turbulent ocean.

ISBN: 9780438902466Subjects--Topical Terms:

528155
Fluid mechanics.

The Origins and Evolution of Double-diffusive Layers and Associated Heat Transport in the Arctic Ocean.
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520 $a Arctic Ocean heat transport has a central control on Arctic sea-ice cover and global climate. Motivated by the need to better understand this heat transport, this thesis addresses a type of small-scale ocean mixing, double-diffusive convection. Double-diffusive convection is widespread throughout the Arctic Ocean, and is one of the main mechanisms by which deep ocean heat is transported in the central basins. Ocean observations from the extensive Ice-Tethered Profiler dataset are analyzed in conjunction with theoretical analyses to answer several essential questions about the physical nature of double-diffusive structures and associated mixing and fluxes. Findings provide a deeper understanding of how double diffusion affects heat transport pathways in the Arctic Ocean. Double-diffusive convection gives rise to layered structures in the Arctic Ocean: double diffusive staircases and thermohaline intrusions. Two mechanisms for the origins of staircases are developed in this thesis. The first is based on a stability analysis of a perturbation to linear vertical gradients in temperature and salinity in the presence of lateral gradients. It is shown that either a staircase or thermohaline intrusions can develop via growing perturbations, with the result being a function of the strength of the temperature and salinity gradients. When a staircase forms, ocean heat is primarily transferred upward, while when thermohaline intrusions form, heat is transferred both vertically and horizontally. The results demonstrate how vertical stratification structure dictates the pathways of deep ocean heat in the central Arctic. The second mechanism developed for staircase origins is based on observations that show lateral coherence of staircase mixed layers and thermohaline intrusion layers, which are characterized by their differing along-layer temperature and salinity gradients. The analysis of these along-layer gradients and fine structure in the temperature and salinity observations indicates that a staircase can form via the run-down of thermohaline intrusions (i.e., staircases can be the remnants of intrusions). The theoretical framework in context with observations brings new understanding to how the layers evolve, and how they relate to Arctic Ocean heat and salt transport. Motivated by the increasing potential for wind-energy input to the Arctic Ocean in the face of further sea-ice losses, the persistence of double-diffusive layering and fluxes in a turbulent setting is analyzed. To this end, a unique observational case study is examined which consists of temperature and salinity measurements through double-diffusive layers that are prominent in the vicinity of an energetic warm-core mesoscale eddy. It is shown that heat in the anomalously warm eddy waters is dissipated via fluxes that are both upward (towards the sea ice) and downward (for heat archival in deeper water layers). Analysis of the double-diffusive fluxes from the eddy core and turbulent fluxes from the eddy flanks (where the effects of geostrophic velocity shear are strongest) highlights the importance of double diffusion in heat transfer from these dynamic features. Further, the study quantifies the level of turbulent activity below which double-diffusion can be active, setting important bounds on the role of double-diffusion in a potentially increasingly turbulent ocean.
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