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，重力波在几分钟到数小时不等会影响大气循环，温度和混合过程，并在从对流层延伸到中层层及以上的水平。但是，它们太小，无法在一般循环模型（GCM）中解决，必须通过参数化处理。也就是说，必须将它们的效果大致描述为包括在大型模型中。该研究计划旨在量化重力波的特性，并确定其来源，地理和季节性变化以及它们对大气的影响。重点是飓风和其他对流风暴系统产生的波浪。目的是改善在GCM中参数效应的参数方式。该方法侧重于对以前的现场实验的飞机和气球观测的分析，以获取有关动量通量以及与重力波相关的温度扰动的信息，然后将信息用于开发参数化。与NOAA地球物理动力学实验室和其他组织的研究人员计划，计划在GCMS中进行参数化的合作。这些研究将提供一种研究重力波的全球尺度效应的手段，又是完善参数化的方法。这项工作的目的是通过更准确地近似波的影响来改善大规模的大气模拟。