Atmospheric and oceanic turbulence

大气和海洋湍流

基本信息

  • 批准号:
    RGPIN-2018-04404
  • 负责人:
  • 金额:
    $ 7.33万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2022
  • 资助国家:
    加拿大
  • 起止时间:
    2022-01-01 至 2023-12-31
  • 项目状态:
    已结题

项目摘要

The requested funds are for the study of atmospheric and oceanic fluid turbulence mainly employing high-resolution numerical simulations, but guided by perturbative analytical techniques, statistical closure theories and dimensional analysis. Turbulence is clearly the most complex outstanding problem in fluid dynamics and understanding it better is absolutely necessary to improve high-resolution environmental and climate models. Of crucial importance to large-scale modellers is how geophysical flows mix the various quantities whose distributions are of such great concern to society. In addition, many fields of study including pollutant dispersion modelling, urban meteorology and wind energy generation, require statistical forecast skill on time scales of hours and length scales of 10's to 100's of kilometers, where my group and I have been exploring the more complicated dynamics that prevail. This application concerns only the fundamental research issues. The applicant also values his longstanding collaborations with the numerical weather prediction community and a new urban meteorology group in Hong Kong, along with their HQP and in-kind funding. Specifically, the influence of rotation and stratification on classical turbulence statistics will be examined. The subject belongs to the family of studies of waves and vortices in some limits and classical theory suggests that large-scale temperature, pressure and wind are balanced in such a way that high-frequency waves have low amplitudes. The last 10 years have seen rapid progress by many groups worldwide in characterising the wave/vortex nature of turbulence at scales smaller than those of the baroclinic eddies in both atmosphere and ocean. This has been in field observations, lab experiments, numerical simulation and theory and the current vigour in the field is explained by the fact that realistic models have now reached resolutions where our lack of dynamical understanding is detrimental to progress. My own group has found that balance dynamics cannot exist in the small-scale regime where rotation is less important. Here, there exists a single turbulent time scale and wave/vortex decompositions break down. At larger scales higher-order balance dynamics give rise to steep wave number to the -3 energy spectra, whereas a breakdown of balance yields a -5/3 spectrum consistent with observations. Spontaneous imbalance occurs primarily in regions of large strain. The next step is to formulate parameterisation schemes that dissipate balanced energy in precisely the right locations at the right time, instead of being based on global averages over long periods. The second novelty is that we now include realistic vertical inhomogeneities, such as the ground, ocean surface, thermocline and tropopause, etc., where it is proposed that we are now ready to include the role of waves in boundary-layer turbulence.
申请的资金主要用于研究大气和海洋流体湍流,主要使用高分辨率数值模拟,但以微扰分析技术、统计闭合理论和量纲分析为指导。湍流显然是流体力学中最复杂的突出问题,更好地了解它对于改进高分辨率的环境和气候模型是绝对必要的。对于大规模建模人员来说,至关重要的是地球物理流动如何混合各种量,这些量的分布是社会非常关注的。此外,许多研究领域,包括污染物扩散模拟、城市气象和风能发电,都需要在10‘S到100’S公里的时间尺度和长度尺度上的统计预测技能,我和我的团队一直在探索更复杂的动力学。这项申请只涉及基础性研究问题。申请者也重视他与数值天气预报社区和香港一个新的城市气象小组的长期合作,以及他们的HQP和实物资助。具体地说,旋转和层结对经典湍流统计的影响将被检验。这门学科在一定范围内属于波浪和涡旋的研究家族,经典理论认为,大尺度的温度、气压和风是以一种高频波具有低振幅的方式平衡的。在过去的10年里,世界各地的许多小组在描述大气和海洋中比斜压涡旋更小尺度的湍流的波动/涡旋性质方面取得了迅速的进展。这已经在现场观察、实验室实验、数值模拟和理论中得到了证明,该领域目前的活力可以通过以下事实得到解释:现实模型现在已经达成了解决方案,而我们对动力学的缺乏理解不利于进展。我自己的团队发现,在旋转不那么重要的小规模制度中,平衡动力是不存在的。在这里,存在单一的湍流时间尺度,波/涡分解被分解。在更大尺度上,高阶平衡动力学导致-3能谱的陡峭波数,而平衡破裂产生与观测一致的-5/3谱。自发性失衡主要发生在应变较大的地区。下一步是制定参数化方案,在正确的时间准确地在正确的地点消散平衡的能量,而不是基于长期的全球平均水平。第二个新奇之处是,我们现在包括了现实的垂直不均匀,如地面、海洋表面、温跃层和对流层顶等,其中建议我们现在准备包括波在边界层湍流中的作用。

项目成果

期刊论文数量(0)
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Bartello, Peter其他文献

Turbulence Effects of Collision Efficiency and Broadening of Droplet Size Distribution in Cumulus Clouds
  • DOI:
    10.1175/jas-d-17-0123.1
  • 发表时间:
    2018-01-01
  • 期刊:
  • 影响因子:
    3.1
  • 作者:
    Chen, Sisi;Yau, M. K.;Bartello, Peter
  • 通讯作者:
    Bartello, Peter

Bartello, Peter的其他文献

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{{ truncateString('Bartello, Peter', 18)}}的其他基金

Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2021
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2020
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2019
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2018
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2017
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2016
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2015
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2014
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2013
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Geophysical fluid turbulence
地球物理流体湍流
  • 批准号:
    217040-2008
  • 财政年份:
    2012
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual

相似国自然基金

Submesoscale Processes Associated with Oceanic Eddies
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相似海外基金

Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2021
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2020
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2019
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence
大气和海洋湍流
  • 批准号:
    RGPIN-2018-04404
  • 财政年份:
    2018
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2017
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2016
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2015
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2014
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Atmospheric and oceanic turbulence below the deformation scale
变形尺度以下的大气和海洋湍流
  • 批准号:
    217040-2013
  • 财政年份:
    2013
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Discovery Grants Program - Individual
Wave Turbulence in Atmospheric and Oceanic Flows
大气和海洋流动中的波湍流
  • 批准号:
    0071937
  • 财政年份:
    2000
  • 资助金额:
    $ 7.33万
  • 项目类别:
    Standard Grant
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