Theoretic Studies in Geophysical Fluid Dynamics and Climate Dynamics

地球物理流体动力学和气候动力学理论研究

• 批准号: 1211218
• 负责人: Shouhong Wang
• 金额: $ 11.6万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1211218&HistoricalAwards=false
• 关键词: Theoretic; Studies; Geophysical; Fluid; Dynamics

In this project, the PI will study large scale atmospheric and oceanic flows, with the goal of understanding their structure, robustness and stability in order to improve their predictability, in particular with respect to their low-frequency variability. The project will continue to develop the PI's dynamic transition theory for both deterministic and random dissipative systems, and apply this to the study of dynamic transitions and pattern formations in atmospheric and oceanic geophysical flows. Such flows include the wind driven ocean circulation, the meridional overturning oceanic circulation, and the tropical atmosphere-ocean modes associated with the El Nino Southern Oscillations (ENSO). Their variability, independently and interactively, may play a significant role in climate changes, past and future. A combination of physical modeling, asymptotic methods, rigorous mathematical theory, and large scale computing will be used to yield new insights into physical phenomena. The mathematical models in the project are based on partial differential equations, which can be put into the perspective of dissipative systems. The dynamic transitions of such dissipative systems are then classified as continuous, catastrophic or random. The project involves specific collaborations with active atmosphere/ocean scientists in different institutions. Graduate students will be involved in the project as well.In this project, the PI and his collaborators will work on mathematical models for large scale climate phenomena such as the El Nino Southern Oscillations (ENSO), with the goal of understanding their long term variability. A recently developed dynamic transition theory will be employed for this purpose. The approach allows one to look at the full set of transition states, e.g. the onset of an El Nino or a La Nina episode. By identifying such transition states and classifying them both mathematically and physically, possible physical mechanisms for such phenomena can be identified or perhaps ruled out. The proposed research involves specific collaborations with active atmosphere/ocean scientists in different institutions, and it is expected that the proposed studies will lead to improved predictions and new insights of weather, climate, and environmental phenomena of central importance to our economy. Also, graduate students are partially involved in the proposed project.

在这个项目中，PI将研究大规模大气和海洋流动，目的是了解它们的结构，鲁棒性和稳定性，以提高它们的可预测性，特别是在低频变化方面。该项目将继续为确定性和随机耗散系统发展PI的动态过渡理论，并将其应用于大气和海洋地球物理流动的动态过渡和模式形成的研究。这些流动包括风驱动的海洋环流，纬向翻转海洋环流，以及与厄尔尼诺南方涛动（ENSO）相关的热带大气-海洋模态。它们的变异性，无论是独立的还是相互作用的，都可能在过去和未来的气候变化中发挥重要作用。物理建模，渐近方法，严格的数学理论和大规模计算的组合将被用来产生新的见解物理现象。该项目中的数学模型是基于偏微分方程，这可以放在耗散系统的角度。然后将此类耗散系统的动态转变分类为连续的、灾难性的或随机的。该项目涉及与不同机构活跃的大气/海洋科学家的具体合作。研究生也将参与该项目。在这个项目中，PI和他的合作者将研究大尺度气候现象的数学模型，如厄尔尼诺南方涛动（ENSO），目的是了解它们的长期变化。最近发展的动态过渡理论将用于这一目的。这种方法可以让人们看到一整套过渡状态，例如厄尔尼诺或拉尼娜事件的开始。通过识别这种过渡状态并在数学和物理上对它们进行分类，可以识别或排除这种现象的可能物理机制。拟议的研究涉及与不同机构的活跃大气/海洋科学家的具体合作，预计拟议的研究将改进对我们经济至关重要的天气，气候和环境现象的预测和新见解。此外，研究生也部分参与了拟议的项目。