CEDAR: The Influence of Lower Atmosphere Forcing on the Composition Structure of the Thermosphere

CEDAR：低层大气强迫对热层组成结构的影响

• 批准号: 9714681
• 负责人: Timothy Fuller-Rowell
• 金额: $ 21万
• 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: 1998
• 资助国家: 美国
• 起止时间: 1998-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9714681&HistoricalAwards=false
• 关键词: CEDAR; Influence; Lower; Atmosphere; Forcing

In attempting to quantify the upward coupling of lower atmosphere forcing on the thermosphere's composition structure, the investigators are using a 'seamless' global model based on physics within two existing models. The Spectral Mesosphere Lower Thermosphere Model (SMLTM) produces realistic simulations of mean winds, tidal amplitudes, and gravity wave forcing, while the Coupled Thermosphere Ionosphere Model (CTIM) examines physics of the upper atmosphere, including thermosphere-ionosphere interactions, and the dynamics and composition response to solar and geomagnetic activity. Combined, the two models emphasize the impact seasonal and hemispheric asymmetry of tides and gravity waves have on major species composition of the atmosphere. In addition, they determine the impact of lower atmosphere forcing on thermospheric composition, temperature and wind structure, and neutral density anomalies.

在试图量化低层大气对热层组成结构的向上耦合时，研究人员正在使用一个基于两个现有模型物理学的“无缝”全球模型。 光谱中间层低热层模式（SMLTM）对平均风、潮汐振幅和重力波强迫进行了逼真的模拟，而耦合热层电离层模式（CTIM）则研究了高层大气的物理学，包括热层-电离层相互作用，以及对太阳和地磁活动的动态和成分反应。 结合起来，这两个模型强调了潮汐和重力波对大气主要物种组成的季节性和半球不对称性的影响。 此外，它们还确定了低层大气强迫对热层组成、温度和风结构以及中性密度异常的影响。