Gravity Wave Sources and Parameterization

重力波源和参数化

基本信息

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

项目摘要

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.

据信，周期从几分钟到几小时的重力波会影响从对流层延伸到中间层及以上的大气环流、温度和混合过程。然而，它们太小，无法在大气环流模型 (GCM) 中解析，必须通过参数化进行处理。也就是说，必须大致描述它们的影响才能包含在大型模型中。该研究计划旨在量化重力波的特性并确定其来源、地理和季节变化及其对大气的影响。重点是飓风和其他对流风暴系统产生的波浪。目标是改进在 GCM 中参数化其效果的方法。该方法侧重于分析先前现场实验中的飞机和气球观测结果，以获得与重力波相关的动量通量和温度扰动信息，然后利用该信息来开发参数化。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，将参数化纳入 GCM 中。这些研究将为研究重力波的全球尺度效应和完善参数化提供一种方法。这项工作的目标是通过更准确地近似波浪的影响来改进大规模大气模拟。