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
• 负责人: Bartello, Peter
• 金额: $ 2.4万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=523669
• 关键词: Atmospheric; oceanic; turbulence; below; deformation

Turbulence has been identified by some of the foremost scientists of all time as the most important outstanding question of classical physics. Over the last 50 years the physicists have largely handed it over to applied mathematics. The prestigious Isaac Newton Institute for the Mathematical Sciences in Cambridge thinks it necessary to hold a programme on turbulence once a decade, approximately. At the last such meeting in 2008 it was concluded by most participants that the most progress since the previous meeting in 1999 had occurred in the field of stratified turbulence. Clearly, meteorology and oceanography are in a position to benefit from this progress and that is the aim of this application. The applicant has been an enthusiastic participant in this work for the last two decades. The requested funds are to continue the study of atmospheric and oceanic fluid turbulence employing high-resolution numerical simulations, perturbative analytical techniques, statistical closure theories and dimensional analysis. Specifically, the influence of aspects of the atmospheric and oceanic setting on classical turbulence statistics will be examined. For example, the nonlinear interactions between the various wave motions and the vortices, known to be ubiquitous in these flows, will be a primary focus as well as the small-scale breakdown of the simplifying balance assumptions employed at larger scales. Of crucial importance to environmental modellers is how such flows mix various quantities whose distributions are of present concern to society. In addition, wind energy generation requires statistical forecast skill on a time scale of hours and length scales of 10's of kilometers, where these dynamics are prevalent. Given the progress made over the last decade, we are now in a position to investigate the connection between this regime and the familiar quasigeostrophic flow at large scales. The effect of condensation and evaporation of water on turbulent mixing, mesoscale predictability, spontaneous breakdown of high-order balance and its role in oceanic and atmospheric energy budgets are among the subjects that need addressing. Finally, an important part of the proposal concerns the effect of adding internal and external boundaries.

湍流被一些有史以来最重要的科学家确定为经典物理学中最重要的悬而未决的问题。 在过去的50年里，物理学家们基本上把它交给了应用数学。 位于剑桥的著名的艾萨克·牛顿数学科学研究所认为，大约每十年就有必要举办一次关于湍流的项目。 在2008年的上一次会议上，大多数与会者得出结论，自1999年上次会议以来，最大的进展发生在分层湍流领域。 显然，气象学和海洋学能够从这一进展中受益，这就是本申请的目的。 申请人在过去二十年中一直热心参与这项工作。 请拨的资金将用于继续利用高分辨率数值模拟、微扰分析技术、统计闭合理论和量纲分析研究大气和海洋流体湍流。 具体而言，大气和海洋环境方面的影响，对经典的湍流统计将进行检查。 例如，在这些流动中普遍存在的各种波动和旋涡之间的非线性相互作用，以及在大尺度上采用的简化平衡假设的小尺度分解，将是主要的焦点。 对环境建模者来说至关重要的是，这种流动如何混合各种数量，其分布是社会目前关注的问题。 此外，风能发电需要在小时的时间尺度和数十公里的长度尺度上的统计预测技能，其中这些动态是普遍的。 鉴于在过去十年中取得的进展，我们现在能够在大尺度上研究这种制度和熟悉的准地转流之间的联系。 水的凝结和蒸发对湍流混合的影响、中尺度可预报性、高阶平衡的自发破坏及其在海洋和大气能量收支中的作用都是需要解决的问题。最后，提案的一个重要部分涉及增加内部和外部边界的影响。