Banner Cloud Dynamics: Steps Towards a Theory and Simulations With Realistic Orography

Banner 云动力学：通过现实地形走向理论和模拟的步骤

• 批准号: 238799663
• 负责人: Professor Dr. Volkmar Wirth
• 金额: --
• 依托单位: Institut für Physik der Atmosphäre
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/238799663?language=en
• 关键词: Banner; Cloud; Dynamics; Steps; Towards

Banner clouds are clouds in the lee of high mountains or steep ridges. Current wisdom explains their formation as mainly due to forced uplift in the rising branch of a lee vortex. An earlier project funded by the DFG revealed some basic insight. This was acheived on the one hand through detailed observations at Mount Zugspitze, which allowed for the first time to systematically characterize this cloud type. On ther other hand, simulations with the help of a Large Eddy Simulation model shed new light on formation mechanisms. The current project aims to take advantage of this earlier project and further our knowledge in a twofold way. First it is planned to carry through simulations with realistic orography (instead of idealized pyramid-shaped orography). This allows comparison with a wealth of observational data from the earlier DFG project. Second, it is planned to work towards a theory of banner cloud formation. The latter will be based on systematic sets of numerical simulations using the well-established model setup.

旗云是高山或陡峭山脊背风处的云。目前的观点认为，它们的形成主要是由于背风涡上升分支的强制抬升所致。 DFG 资助的一个早期项目揭示了一些基本的见解。一方面，这是通过在楚格峰进行的详细观测实现的，这使得首次能够系统地描述这种云类型。另一方面，借助大涡模拟模型进行的模拟为形成机制提供了新的线索。当前的项目旨在利用这个早期项目的优势，并以双重方式进一步加深我们的知识。首先计划用现实的地形（而不是理想化的金字塔形地形）进行模拟。这样可以与早期 DFG 项目的大量观测数据进行比较。其次，计划致力于旗帜云形成理论的研究。后者将基于使用完善的模型设置的系统数值模拟集。

项目成果

What Flow Conditions are Conducive to Banner Cloud Formation

哪些流动条件有利于横幅云的形成

• DOI: 10.1175/jas-d-15-0319.1
• 发表时间: 2016
• 期刊: Journal of the Atmospheric Sciences
• 影响因子: 3.1
• 作者: Prestel;und V. Wirth
• 通讯作者: und V. Wirth