Global S&T Development Trend Analysis Platform of Resources and Environment
项目编号 | 1445783 |
Collaborative Research: CEDAR: High-Resolution Imaging of Instability Dynamics and Breakdown | |
David Fritts | |
主持机构 | G & A Technical Software, Inc. |
项目开始年 | 2015 |
2015-07-15 | |
项目结束日期 | 2018-06-30 |
资助机构 | US-NSF |
项目类别 | Continuing grant |
项目经费 | 80000(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | This is a 3-year collaborative investigation between The Aerospace Corporation and GATS Inc. to place a new airglow camera at the Andes Lidar Observatory (ALO) in Chile and use those data to study turbulent processes near the mesopause. Turbulent viscosity is a critical unknown parameter in numerical models of the 80 to 100 km altitude region. It is notoriously very difficult to measure. This project will provide a method of measuring this parameter in this important atmospheric region where turbulent viscosity may vary by 3 orders of magnitude. The results of this study will also contribute to a more general understanding of fluid dynamics accompanying flow instabilities. Specifically, this project will utilize the Aerospace Corporation?s new high-resolution infrared camera (AIC2) that uses fast optics and a 2048 x 2048 IR detector to image the OH airglow at 30 m pixel size with a 2 s image cadence. The ALO site also includes a Na wind-temperature lidar and a meteor radar. Data from the AIC2 and the other ALO instruments will be used to investigate the breakdown into turbulence of Kelvin-Helmholtz instabilities (KHIs) and to measure the turbulent viscosity. This new technique will allow characterization of the turbulent viscosity for a variety of background conditions and over daily and seasonal timescales. The measurements will be combined with high-resolution direct numerical simulations to produce the most complete picture to date of KHI breakdown and its evolution into turbulence. |
来源学科分类 | Geosciences - Atmospheric and Geospace Sciences |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/68264 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | David Fritts.Collaborative Research: CEDAR: High-Resolution Imaging of Instability Dynamics and Breakdown.2015. |
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