Extending Abyssal Mixing Observations and Parameterizations

扩展深渊混合观测和参数化

基本信息

  • 批准号:
    0961262
  • 负责人:
  • 金额:
    $ 20.66万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2010
  • 资助国家:
    美国
  • 起止时间:
    2010-04-15 至 2013-09-30
  • 项目状态:
    已结题

项目摘要

Intellectual Merit: Observational studies suggest the existence of only weak diapycnal mixing in the ocean interior, with orders of magnitude more mixing near the bottom in regions of rough topography. In contrast, numerical circulation and climate models generally employ spatially uniform parameterizations of abyssal diapycnal mixing. However, several recent numerical studies demonstrate the sensitivity of the large scale abyssal ocean circulation to the spatial distribution of abyssal diapycnal mixing, leading modelers to recognize that mixing parameterizations mimicking the observed spatial variability are required to improve simulations of the ocean circulation.As is typical in oceanography, a major problem hampering both the development and validation of improved abyssal mixing parameterizations is the scarcity of observations. Microstructure observations, the most direct and accurate tool with which to infer diapycnal mixing, have only been accomplished in a few select regions of the global ocean and will unfortunately not become a routine measurement in the near future due to their cost and the necessity for very high levels of quality control. Consequently, much work has focused on ways to infer diapycnal mixing indirectly from standard hydrographic data, potentially yielding a much more densely sampled global map of diapycnal mixing. A now common approach is the application of fine-scale parameterizations, relating turbulent dissipation to shear and/or strain variance on scales of order 10 meters, based on nonlinear internal wave-wave interaction theory. However, it is becoming increasingly clear that fine-scale parameterizations are reliable predictors only for a very limited range of conditions. The method is known to break down in special environments (e.g., the coastal slope, canyons) and to be a poor predictor of diapycnal mixing in weakly stratified water. The stratification limitation is severe since both the global abyssal ocean (depth 1000 m) and the Southern Ocean fall in that category. The abyssal and Southern Ocean are important branches of the Meridional Overturning Circulation and thus the credibility of climate modeling studies depends on accurate representation of diapycnal mixing in these ocean volumes. The World Ocean Circulation Experiment (WOCE) hydrographic data will be re-analyze using Thorpe scale analysis. Thorpe scale analysis has been shown to be a more robust predictor of dissipation and diapycnal mixing than fine-scale parameterizations, in particular in weak stratification and regions where the characteristics of the internal wave field deviate from the canonical Garrett-Munk model, yet has not been applied extensively to the WOCE hydrographic data set. The expected results from this work are an improved observational knowledge of the spatial distribution of mixing in the abyssal ocean. We also propose a comprehensive comparison and validation of existing abyssal mixing parameterizations intended for use in general circulation and climate models. Broader Impacts: The funds requested in this proposal are intended for the support of a postdoctoral investigator. The results from this project will be disseminated in the refereed literature, made available online and presented at appropriate scientific meetings. The spatial variability of mixing significantly affects the abyssal circulation and stratification, the strength and depth of the Antarctic Circumpolar Current as well as various aspects of the meridional overturning circulation (MOC). In turn, these relate to the ability of the ocean to store and transport heat and greenhouse gasses, and thus the response of the climate system to anthropogenic and natural forcing. This project is expected to result in a better observational knowledge of the spatial distribution of mixing than achieved to date, and to contribute to the improvement of diapycnal mixing parameterizations intended for ocean general circulation models and climate models.
智力优点:观测研究表明,海洋内部仅存在微弱的双重混合,而在地形粗糙的区域,底部附近的混合程度要高出几个数量级。相比之下,数值环流和气候模型通常采用深渊二密混合的空间均匀参数化。然而,最近的几项数值研究证明了大规模深海海洋环流对深海二重混合的空间分布的敏感性,使建模者认识到需要模拟观测到的空间变化的混合参数化来改进海洋环流的模拟。在海洋学中,阻碍改进深海混合参数化的开发和验证的一个主要问题是观测数据的缺乏。微观结构观测是推断二重混合的最直接、最准确的工具,仅在全球海洋的几个选定区域完成,不幸的是,由于其成本和需要非常广泛的技术,在不久的将来不会成为常规测量。高水平的质量控制。因此,许多工作都集中在从标准水文数据间接推断二密混合的方法上,有可能产生更密集采样的二密混合全局图。现在常见的方法是应用精细尺度参数化,基于非线性内波-波相互作用理论,将湍流耗散与 10 米量级的剪切和/或应变方差相关联。然而,越来越清楚的是,精细尺度参数化仅适用于非常有限的条件范围。众所周知,该方法在特殊环境(例如沿海斜坡、峡谷)中会失效,并且对于弱分层水中的二重混合预测效果不佳。由于全球深海(深度 1000 米)和南大洋都属于这一类别,因此分层限制非常严重。深海和南大洋是经向翻转环流的重要分支,因此气候模型研究的可信度取决于这些海洋体积中二重混合的准确表示。世界海洋环流实验(WOCE)水文数据将使用索普尺度分析进行重新分析。索普尺度分析已被证明是比精细尺度参数化更稳健的耗散和二重混合预测器,特别是在弱分层和内波场特征偏离规范 Garrett-Munk 模型的区域,但尚未发现被广泛应用于 WOCE 水文数据集。这项工作的预期结果是提高对深海混合空间分布的观测知识。我们还建议对用于大气环流和气候模型的现有深海混合参数化进行全面比较和验证。更广泛的影响:本提案中要求的资金旨在支持博士后研究人员。该项目的结果将在参考文献中传播、在线提供并在适当的科学会议上展示。混合的空间变化显着影响深海环流和分层、南极绕极流的强度和深度以及经向翻转环流(MOC)的各个方面。反过来,这些又与海洋储存和运输热量和温室气体的能力有关,从而与气候系统对人为和自然强迫的响应有关。该项目预计将比迄今为止获得更好的混合空间分布观测知识,并有助于改进用于海洋环流模型和气候模型的二密混合参数化。

项目成果

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Douglas Luther其他文献

Douglas Luther的其他文献

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{{ truncateString('Douglas Luther', 18)}}的其他基金

Collaborative Research: Forcing, Energy Flow and Impacts of Oceanic Infragravity Waves
合作研究:海洋次重力波的强迫、能量流和影响
  • 批准号:
    1948020
  • 财政年份:
    2020
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Impact of Nonlinear Barotropic Tides in the North Pacific
北太平洋非线性正压潮汐的影响
  • 批准号:
    1460022
  • 财政年份:
    2015
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Near-Surface Conversions of Semi-Diurnal Internal Tide Beam Energy
半日内潮汐束能量的近地表转换
  • 批准号:
    1538427
  • 财政年份:
    2015
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Internal Wave Induced Sub-inertial Currents (IWISC)
内波感应次惯性电流 (IWISC)
  • 批准号:
    0551371
  • 财政年份:
    2006
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Collaborative Research - SGER - Model Verification of Radiation of Barotropic Energy from the Gulf Stream
合作研究 - SGER - 墨西哥湾流正压能量辐射模型验证
  • 批准号:
    0404499
  • 财政年份:
    2004
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Collaborative Research: Gulf Stream Re-Analysis - Structure, Transport and Dynamics
合作研究:湾流重新分析 - 结构、传输和动力学
  • 批准号:
    0352229
  • 财政年份:
    2004
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Collaborative Research: Observing Integrating Ocean Variables
合作研究:观测整合海洋变量
  • 批准号:
    0355571
  • 财政年份:
    2004
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Continuing Grant
Hawaii Ocean Mixing Experiment (HOME): Near-Field Program: Moored Measurements of Tidal Oscillations
夏威夷海洋混合实验(主页):近场计划:潮汐振荡的系泊测量
  • 批准号:
    9819533
  • 财政年份:
    2001
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Continuing Grant
The Sub-Antarctic Flux and Dynamics Experiment (SAFDE): Renewal Proposal for Data Analysis and Model Comparisons
亚南极通量和动力学实验(SAFDE):数据分析和模型比较的更新提案
  • 批准号:
    9911974
  • 财政年份:
    2000
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Standard Grant
Hawaii Ocean Mixing Experiment (HOME): Historical Data Analysis Program - U. Hawaii Contribution
夏威夷海洋混合实验(HOME):历史数据分析程序 - 美国夏威夷贡献
  • 批准号:
    9819517
  • 财政年份:
    1999
  • 资助金额:
    $ 20.66万
  • 项目类别:
    Continuing Grant

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深渊贝壳的成份结构与极端环境的关联性研究
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合作研究:通过船基 Chi-pod 测量量化深海混合的区域变化
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Accurate parameterization of turbulent mixing processes in the abyssal ocean for embedding in next-generation global overturning circulation models
深海湍流混合过程的精确参数化,用于嵌入下一代全球翻转环流模型
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