CEDAR: Planetary Wave Induced Tidal Variability

CEDAR：行星波引起的潮汐变化

• 批准号: 0228026
• 负责人: Scott Palo
• 金额: --
• 依托单位: University of Colorado at Boulder
• 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 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0228026&HistoricalAwards=false
• 关键词: CEDAR; Planetary; Wave; Induced; Tidal

The atmospheric tides are global scale oscillations in the basic state of the Earths atmosphere (winds, temperature and density) that are forced in the lower-atmosphere and propagate vertically into the upper atmosphere and ionosphere. Over the past decade basic understanding of the migrating atmospheric tides has emerged, largely from an increase in the number of ground-based observatories across the globe making wind and temperature measurements of the mesosphere- and lower-thermosphere (MLT) roughly between 70 and 120km. The continuing increase in the availability of observational data from ground and space based instruments is providing atmospheric scientists with the opportunity to improve their theoretical understanding of the mechanisms that drive atmospheric tides. This is accomplished through a process that includes both numerical models and observational data. The basic approach for this research is to use the Whole Atmosphere Community Climate Model (WACCM) that has been under development at the National Center for Atmospheric Research. WACCM is a fully nonlinear, four-dimensional global circulation model of the atmosphere spanning from the surface to an altitude of 140km. Analysis of WACCM results will be compared with the global network of MLT observations, including those from the recently launched TIMED spacecraft, to validate the tidal and planetary wave structure simulated by the model. Once validated, the model will be utilized to estimate the affect of global scale planetary waves on the structure of the atmospheric tides.

大气潮汐是地球大气基本状态（风、温度和密度）的全球尺度振荡，在低层大气中被迫发生，并垂直传播到高层大气和电离层。在过去的十年里，人们对迁移的大气潮汐有了基本的了解，这主要是因为地球仪上地面观测站的数量增加，这些观测站对中间层和低热层（MLT）的风和温度进行了大约70到120公里的测量。从地面和空间仪器获得的观测数据不断增加，为大气科学家提供了机会，以提高他们对驱动大气潮汐机制的理论理解。这是通过一个包括数值模型和观测数据的过程来实现的。这项研究的基本方法是使用国家大气研究中心正在开发的全大气社区气候模式（WACCM）。WACCM是一个完全非线性的四维全球大气环流模式，覆盖范围从地面到140公里的高度。WACCM结果的分析将与全球MLT观测网络进行比较，包括最近发射的TIMED航天器，以验证模型模拟的潮汐和行星波结构。一旦验证，该模式将被用来估计全球尺度行星波对大气潮汐结构的影响。