Atmospheric and geophysical fluid dynamics

大气和地球物理流体动力学

• 批准号: 9627-2009
• 负责人: Peltier, Richard
• 金额: $ 10.56万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=513374
• 关键词: Atmospheric; geophysical; fluid; dynamics

The research for which this proposal seeks continuing support addresses issues in mathematical geophysics on the one hand and in the fluid mechanics of atmospheric, oceanic and solid Earth processes on the other, areas that intersect in work on climate dynamics and climate system history. An example of such intersection is embodied in the unique theory I have developed to describe the deformations of planetary shape and accompanying variations in sea level caused by the Late Quaternary glacial cycle. The predictions of this model have been dramatically confirmed by the time-dependent gravity field observations provided by the GRACE satellites that remain in space. A further refined version of the model is being produced for the Paleoclimate Modelling Intercomparison Project (PMIP3) in work leading to the next IPCC report. This will include an improved representation of the depth dependence of mantle viscosity and a better constrained model of Eurasian deglaciation. The data sets produced will be employed by my own group and internationally in new coupled simulations of climate variability from Last Glacial Maximum to Holocene. Production work is also beginning on application of the now complete new three dimensional spherical numerical models of the general circulation of the mantle of the Earth and the atmospheric weather layers of the Gas Giant planets, the former directed towards improving our understanding of the impact of pressure induced phase transitions on the radial mixing length, and the latter towards providing an understanding of the origin and stability of the zonal jets that dominate the pole-to-pole variations of mean-flow velocity observed to characterize these objects. This work on Gas Giant zonal flows is leading towards the development of a new non-hydrostatic dry dynamical core that may be substituted for those used in more conventional atmospheric GCM's. On smaller spatial scales and in the area of pure fluid mechanics, I have begun a new project on the efficiency with which fully three-dimensional turbulence may act non-diffusively in mixing a mean density stratification, work that speaks to the way in which such turbulent processes should be "parameterized" in large-scale models.

本提案寻求继续支持的研究一方面涉及数学物理学问题，另一方面涉及大气、海洋和固体地球过程的流体力学问题，这些领域在气候动力学和气候系统历史的工作中相互交叉。 这种交叉的一个例子体现在我发展的独特理论中，该理论描述了晚第四纪冰川循环引起的行星形状的变形和伴随的海平面变化。 该模型的预测已被留在太空中的GRACE卫星提供的随时间变化的重力场观测结果所证实。 该模型的进一步改进版本正在为古气候模拟相互比较项目（PMIP3）制作，该项目正在为IPCC的下一份报告做准备。 这将包括一个改进的地幔粘度的深度依赖性的代表性和更好的欧亚冰川消退的约束模型。 所产生的数据集将被我自己的小组和国际上的新的耦合模拟的气候变化，从末次盛冰期到全新世。 生产工作也开始应用现已完成的新的地球地幔大气环流和气体巨行星大气天气层的三维球形数值模型，前者旨在提高我们对压力诱导相变对径向混合长度的影响的理解，后者提供了对纬向喷流的起源和稳定性的理解，纬向喷流支配着观测到的用于表征这些物体的平均流速的极间变化。 这项关于巨型气体纬向流的工作正朝着开发一种新的非流体静力干动力核心的方向发展，这种核心可能取代那些在更传统的大气GCM中使用的核心。 在较小的空间尺度上，在纯流体力学领域，我已经开始了一个新的项目的效率与全三维湍流可能会采取非扩散混合的平均密度分层，工作，说话的方式，这种湍流过程应该是“参数化”在大尺度模型。