Gravity Wave Sources and Parameterization

重力波源和参数化

• 批准号: 0234230
• 负责人: M Joan Alexander
• 金额: $ 40.63万
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0234230&HistoricalAwards=false
• 关键词: Gravity; Wave; Sources; Parameterization

Gravity waves with periods ranging from minutes to hours are believed to affect the atmospheric circulation, temperature, and mixing processes at levels extending from the troposphere through the mesosphere and above. However, they are too small to be resolved in general circulation models (GCMs) and must be treated via parameterization. That is, their effects must be described approximately for inclusion in large-scale models. This research program aims to quantify the properties of gravity waves and determine their sources, their geographic and seasonal variations, and their effects on the atmosphere. Emphasis is on the waves generated by hurricanes and other convective storm systems. The goal is to improve the ways of parameterizing their effects in GCMs. The approach focuses on analysis of aircraft and balloon observations from previous field experiments to derive information on the momentum flux and the temperature perturbations associated with gravity waves, which information is then employed for developing parameterizations. Collaboration on including the parameterizations in GCMs is planned with researchers at the NOAA Geophysical Fluid Dynamics Laboratory and other organizations. These studies will provide a means of both studying the global-scale effects of gravity waves and refining the parameterizations. The goal of the work is to improve large-scale atmospheric simulations by approximating more accurately the effects of the waves.

周期从几分钟到几小时的重力波被认为在从对流层延伸到中间层和更高层的水平上影响大气环流、温度和混合过程。然而，它们太小，不能在大气环流模式(GCM)中求解，必须通过参数化处理。也就是说，它们的影响必须被近似地描述，以便包含在大规模模型中。这项研究计划旨在量化重力波的特性，并确定其来源、地理和季节变化以及对大气的影响。重点放在飓风和其他对流风暴系统产生的波浪上。我们的目标是改进在GCM中对其影响进行参数化的方法。该方法的重点是分析从以前的现场实验中获得的飞机和气球观测，以得出与重力波有关的动量通量和温度扰动的信息，然后将这些信息用于开发参数。计划与NOAA地球物理流体动力学实验室和其他组织的研究人员合作，在GCM中包括参数化。这些研究将为研究重力波的全球尺度效应和改进参数提供一种手段。这项工作的目标是通过更准确地逼近海浪的影响来改进大规模大气模拟。