CEDAR: Numerical Investigation of Observed Multiscale Dynamics in the Middle Atmosphere

CEDAR：中层大气中观测到的多尺度动力学的数值研究

• 批准号: 1139155
• 负责人: Brian Laughman
• 金额: $ 24.4万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-01-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1139155&HistoricalAwards=false
• 关键词: CEDAR; Numerical; Investigation; Observed; Multiscale

This is a 3-year modeling effort to be undertaken as part of the Coupling, Energetics and Dynamics of Atmospheric Regions program. Atmospheric gravity waves are believed to play a vital role in the transport of energy and momentum between atmospheric layers. This transport is enabled by the propagation of these waves vertically through the background atmosphere and dissipation of these occurs via the growth of instabilities (both convective and shear instabilities). This project utilizes two advanced numerical simulations to investigate gravity wave and instability processes in the Mesosphere-Lower Thermosphere (MLT) region. Previous simulations have been performed in idealized environments and small periodic domains. Here, the simulations will be extended to deep domain studies, which will examine these wave and instability processes in more realistic flows inspired by detailed observations.Gravity waves are a significant forcing source on MLT dynamics and their effects strongly impact general circulation and climate models. In addition, numerical weather prediction models, despite their tropospheric focus, have been shown to make better predictions when the upper-atmospheric dynamics are more accurately modeled. Specifically, improved understanding of when / where gravity waves become unstable in realistic flows that would result from this effort is a vital step towards improving parametrization of these waves in global-scale models.

这是一个为期3年的建模工作，将作为耦合，能量学和大气区域动力学计划的一部分。 大气重力波被认为在大气层间能量和动量的传输中起着至关重要的作用。这种传输是由这些波垂直通过背景大气的传播和耗散这些发生通过增长的不稳定性（对流和剪切不稳定性）。本计画利用两种先进的数值模拟来研究中间层-低热层（MLT）区域的重力波与不稳定性过程。以前的模拟已经在理想化的环境和小周期域中进行。在这里，模拟将扩展到深域的研究，这将检查这些波和不稳定性过程中更现实的流动启发了详细的observation.Gravity波是一个重要的强迫源MLT动力学和它们的影响强烈影响大气环流和气候模式。此外，数值天气预报模型尽管侧重对流层，但在对高层大气动力学进行更准确建模时，已显示出更好的预测。 具体而言，更好地了解重力波何时/何地在实际流动中变得不稳定，这是朝着改善全球尺度模型中这些波的参数化迈出的重要一步。