Multi-Scale Dynamics of Gravity Waves MS-GWaves (Coordination proposal)

重力波的多尺度动力学 MS-GWaves（协调提案）

• 批准号: 258653913
• 负责人: Professor Dr. Ulrich Achatz
• 金额: --
• 依托单位: Institut für Atmosphäre und Umwelt (IAU)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/258653913?language=en
• 关键词: Multi; Scale; Dynamics; Gravity; Waves

Confidence in climate prediction can only be gained if the present climate is modeled correctly for the correct reasons. Currently, there is a debate on dynamical features such as the predicted enhancement of the Brewer-Dobson circulation, the dynamical downward coupling of the stratosphere on the troposphere, and ozone super-recovery. A particularly large source of uncertainty in this context are internal gravity waves (GWs), which cannot be resolved by current chemistry-climate models and are represented by largely oversimplified parameterizations instead. The research unit (RU) will formulate explicit models of GW excitation, propagation, and dissipation in a physically and mathematically consistent way. These will be tested via process-resolving numerical modeling and measurements. Special attention will be given to multi-scale interactions of gravity waves with turbulence, with the balanced flow, and of unresolved small-scale GWs with large-scale, resolved GWs. Models to be developed will lead to a unified parameterization of GWs, from their sources to their dissipation. Both the GW parameterization and global GW permitting and local GW resolving modeling will be used to quantify and mitigate the uncertainties in the understanding of GW impacts on the atmospheric circulation, large-scale dynamical processes in the atmosphere, and climate change. The effort will be based on a close interdisciplinary interaction of mathematics, theory, high-resolution numerical modeling, and measurements of both the wave processes themselves and their effects on the global scale. This combination of methods is employed since only measurements hold the direct link to reality, only theory allows to understand, and since only high-resolution modeling can provide a detailed diagnosis. Such a comprehensive program is far beyond the possibility of a single research institute or some bilateral cooperation but requires a RU with various institutes joining their experimental, computational, and theoretical capabilities. The long-term gains from the RU are to be:- An enhanced and deepened overview of the spatial, temporal and spectral distribution of GWs in the atmosphere.- A significantly improved understanding of the processes causing and controlling the corresponding GW dynamics.- Based on this an increase in the robustness and completeness of the parameterization of GWs as subgrid-scale phenomenon, addressing source processes, GW propagation, GW mean-flow interaction, and GW dissipation.- Hence a more reliable performance of GW parameterizations under anomalous conditions, e.g. climate change.

只有基于正确的理由正确地模拟当前的气候，才能获得气候预测的信心。目前，对动力学特征存在着争论，如预测的布鲁尔-多布森环流的增强、平流层与对流层的动力学向下耦合以及臭氧的超恢复。在这种情况下，一个特别大的不确定性来源是内部重力波（GWs），这是目前的化学气候模型无法解决的问题，而是用过于简化的参数化来表示。研究单位（RU）将以物理和数学一致的方式制定GW激发，传播和耗散的明确模型。这些将通过过程解析数值建模和测量进行测试。将特别注意重力波与湍流、平衡流以及未解决的小尺度重力波与大尺度、已解决的重力波的多尺度相互作用。将开发的模型将导致全球变暖的统一参数化，从他们的来源到他们的耗散。GW参数化和全球GW允许和本地GW解决建模将用于量化和减轻GW对大气环流，大气中的大尺度动力过程和气候变化的影响的理解的不确定性。这项工作将基于数学，理论，高分辨率数值模拟和波过程本身及其对全球范围的影响的测量的密切跨学科的相互作用。采用这种方法的组合是因为只有测量与现实有直接联系，只有理论才能理解，并且只有高分辨率建模才能提供详细的诊断。这样一个全面的计划远远超出了单一研究机构或一些双边合作的可能性，但需要一个RU与各种机构加入他们的实验，计算和理论能力。RU的长期收益是：-增强和深化对大气中全球变暖的空间，时间和光谱分布的概述。对引起和控制相应GW动态的过程的理解有了显着提高。在此基础上，增加了GW参数化的鲁棒性和完整性，作为亚网格尺度现象，解决源过程，GW传播，GW平均流相互作用和GW耗散。因此，在气候变化等异常条件下，GW参数化的性能更可靠。