Instability and Turbulence in a Sheared, Diffusively Unstable Fluid
剪切、扩散不稳定流体中的不稳定性和湍流
基本信息
- 批准号:0453140
- 负责人:
- 金额:$ 58.4万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2005
- 资助国家:美国
- 起止时间:2005-03-01 至 2010-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
0453140Mixing, transport and sequestration of heat in the Earth's oceans contributes a major element of uncertainty to our present understanding of the climate system. Double diffusive instability refers to a set of mixing processes that have no analogue in the atmosphere and whose existence was unsuspected before 1960. Driven by the vast difference in the molecular diffusivities of heat and salt in seawater, these processes contribute significantly to ocean mixing. In the simplest model, double diffusion takes one of two forms: salt fingering and diffusive layering, both of which form easily recognizable thermohaline staircase structures in many regions of the world ocean. Salt fingering is common in mid-latitude waters, while diffusive layering is more prominent near the poles. This theoretical study of shear / double diffusion interactions will illuminate mixing mechanisms active in the large regions of the ocean interior that are subject to both shear and double diffusive instability. The research will employ a combination of primary and secondary stability analyses and direct numerical simulations. These will focus on inflectional shear flows (with and without inertial rotation) and fingering-favorable stratification. Broader Impacts: Besides furnishing new physical insights into this oceanographically important regime of stratified turbulence, the work will result in improved parameterizations of diapycnal fluxes and anisotropy statistics for use both in the analysis of observational data and in large-scale modeling. The proposed work will benefit society by improving the representation of small-scale fluxes in large-scale ocean and climate models, thereby addressing one of the main obstacles to reliable climate forecasting. The project will provide partial support for a scientific programmer and full support for a graduate student, who will learn the latest techniques for the theoretical study of ocean mixing. The research will be done in collaboration with Professor Eric. Kunze of the University of Victoria, Canada.
0453140地球海洋中热量的混合、传输和封存是我们目前对气候系统理解的一个主要不确定因素。双扩散不稳定性是指一组在大气中没有类似物的混合过程,并且在 1960 年之前没有人怀疑其存在。在海水中热量和盐的分子扩散率巨大差异的驱动下,这些过程对海洋混合做出了重大贡献。在最简单的模型中,双扩散采用两种形式之一:盐指效应和扩散分层,这两种形式在世界海洋的许多区域形成易于识别的温盐阶梯结构。盐指现象在中纬度水域很常见,而扩散层在两极附近更为突出。这种剪切/双扩散相互作用的理论研究将阐明海洋内部大片区域中活跃的混合机制,这些区域受到剪切和双扩散不稳定性的影响。该研究将结合初级和次级稳定性分析以及直接数值模拟。这些将重点关注拐点剪切流(有或没有惯性旋转)和指状有利分层。 更广泛的影响:除了为这种海洋学上重要的层状湍流状态提供新的物理见解外,这项工作还将改进径流通量和各向异性统计的参数化,以用于观测数据分析和大规模建模。拟议的工作将通过改善大规模海洋和气候模型中小规模通量的表示来造福社会,从而解决可靠气候预报的主要障碍之一。该项目将为科学程序员提供部分支持,并为研究生提供全面支持,研究生将学习海洋混合理论研究的最新技术。该研究将与埃里克教授合作完成。加拿大维多利亚大学的昆泽。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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William Smyth其他文献
Acoustic Observations of Kelvin‐Helmholtz Billows on an Estuarine Lutocline
河口绿斜层上开尔文·亥姆霍兹波涛的声学观测
- DOI:
10.1029/2019jc015383 - 发表时间:
2020 - 期刊:
- 影响因子:3.6
- 作者:
Junbiao Tu;Daidu Fan;Qiang Lian;Zhiyu Liu;Wei Liu;Alexis Kaminski;William Smyth - 通讯作者:
William Smyth
Shear Instabilities and Stratified Turbulence in an Estuarine Fluid Mud
河口泥浆中的剪切不稳定性和分层湍流
- DOI:
10.1175/jpo-d-21-0230.1 - 发表时间:
2022-06 - 期刊:
- 影响因子:3.5
- 作者:
Junbiao Tu;Daidu Fan;Feixiang Sun;Alexis Kaminski;William Smyth - 通讯作者:
William Smyth
Literature Survey of Clone Detection Techniques
克隆检测技术文献综述
- DOI:
10.5120/17355-7858 - 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
Sonam Gupta;P. C. Gupta;Brenda S. Baker;Magdalena Balazinska;Ettore Merlo;Michel Dagenais;Bruno Lague;Hamid Basit;Simon Pugliesi;William Smyth;Andrei Turpin;Ira Baxter;A. Yahin;Leonardo Moura;Marcelo Sant;J. Cordy;Thomas Dean - 通讯作者:
Thomas Dean
Scaling the Mixing Efficiency of Sediment‐Stratified Turbulence
缩放沉积物的混合效率 - 分层湍流
- DOI:
10.1029/2022gl099025 - 发表时间:
2022-01 - 期刊:
- 影响因子:5.2
- 作者:
Junbiao Tu;Daidu Fan;Zhiyu Liu;William Smyth - 通讯作者:
William Smyth
William Smyth的其他文献
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{{ truncateString('William Smyth', 18)}}的其他基金
Collaborative Research: Marginal instability and deep-cycle turbulence during an extreme El Nino event
合作研究:极端厄尔尼诺事件期间的边缘不稳定和深循环湍流
- 批准号:
1851520 - 财政年份:2019
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Kelvin-Helmholtz turbulence in complex environments
复杂环境中的开尔文-亥姆霍兹湍流
- 批准号:
1830071 - 财政年份:2018
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Kelvin-Helmholtz turbulence: how much mixing does it generate in the Equatorial Oceans?
开尔文-亥姆霍兹湍流:它在赤道海洋中产生多少混合?
- 批准号:
1537173 - 财政年份:2016
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Small-scale instabilities in the upper equatorial oceans
赤道上层海洋的小规模不稳定
- 批准号:
1537000 - 财政年份:2015
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Collaborative Research: Marginal instability and deep cycle turbulence in the equatorial oceans
合作研究:赤道海洋的边缘不稳定和深循环湍流
- 批准号:
1355768 - 财政年份:2014
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Mixing and Radiation in Tropical Instability Waves
热带不稳定波中的混合和辐射
- 批准号:
1030772 - 财政年份:2010
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Thermohaline Interleaving in Baroclinic Frontal Zones
斜压锋区的温盐交错
- 批准号:
0622922 - 财政年份:2006
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
SGER: Theory for Satellite Coronae and Atmospheric Escape
SGER:卫星日冕和大气逃逸理论
- 批准号:
0623327 - 财政年份:2006
- 资助金额:
$ 58.4万 - 项目类别:
Continuing Grant
Efficiency of Mixing in Thin Stratified Layers
薄分层中的混合效率
- 批准号:
0221057 - 财政年份:2002
- 资助金额:
$ 58.4万 - 项目类别:
Standard Grant
Multiscalar Mixing in Turbulent Overturns
湍流翻转中的多标量混合
- 批准号:
0095640 - 财政年份:2001
- 资助金额:
$ 58.4万 - 项目类别:
Continuing Grant
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- 批准号:12372288
- 批准年份:2023
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- 批准号:42305078
- 批准年份:2023
- 资助金额:30 万元
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- 资助金额:31 万元
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- 批准号:52376114
- 批准年份:2023
- 资助金额:50 万元
- 项目类别:面上项目
相似海外基金
CAREER: Sheared stratified turbulence: novel mechanisms and models of complex wave-vortex interactions that impact our environment
职业:剪切分层湍流:影响我们环境的复杂波涡相互作用的新机制和模型
- 批准号:
2042346 - 财政年份:2021
- 资助金额:
$ 58.4万 - 项目类别:
Continuing Grant
The coherent structures of uniformly sheared flow and their role in turbulence production and the diffusion of scalars
均匀剪切流的相干结构及其在湍流产生和标量扩散中的作用
- 批准号:
361431-2009 - 财政年份:2011
- 资助金额:
$ 58.4万 - 项目类别:
Alexander Graham Bell Canada Graduate Scholarships - Doctoral
The coherent structures of uniformly sheared flow and their role in turbulence production and the diffusion of scalars
均匀剪切流的相干结构及其在湍流产生和标量扩散中的作用
- 批准号:
361431-2009 - 财政年份:2010
- 资助金额:
$ 58.4万 - 项目类别:
Alexander Graham Bell Canada Graduate Scholarships - Doctoral
The coherent structures of uniformly sheared flow and their role in turbulence production and the diffusion of scalars
均匀剪切流的相干结构及其在湍流产生和标量扩散中的作用
- 批准号:
361431-2009 - 财政年份:2009
- 资助金额:
$ 58.4万 - 项目类别:
Alexander Graham Bell Canada Graduate Scholarships - Doctoral
The large-scale strucure of uniformly sheared turbulence and its distoriton by a solid wall at rest or in motion
均匀剪切湍流的大尺度结构及其由静止或运动的固体壁引起的变形
- 批准号:
361431-2008 - 财政年份:2008
- 资助金额:
$ 58.4万 - 项目类别:
Alexander Graham Bell Canada Graduate Scholarships - Master's