Dynamics of the Mesospheres and Lower Thermospheres of the Arctic and Antarctic

北极和南极的中层和低层热层的动力学

• 批准号: 9728993
• 负责人: Jeffrey Forbes
• 金额: $ 30.78万
• 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: 1998-05-01 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9728993&HistoricalAwards=false
• 关键词: Dynamics; Mesospheres; Lower; Thermospheres; Arctic

The PI seeks to understand the dynamics of the mesosphere/lower thermosphere (MLT) regions of the Arctic and Antarctic, particularly emphasizing processes originating at lower altitudes. Primarily, he focuses on phenomena involving the origins and seasonal behaviors of (a) the 12-hour oscillation with zonal wavenumber s=1, (b) the migrating diurnal tide, (c) eastward-propagating waves with periods between 1.5 and 10 days, and (d) intradiurnal oscillations with periods between 6 and 11.5 hours. Using the Global-Scale Wave Model and nonlinear time-dependent Spectral Dynamics Model, the investigator ascertains likely mechanisms responsible for these polar-region wave phenomena. In addition, he conducts data analysis from global satellites on ozone densities, which will help ascertain whether insolation absorption by ozone possesses sufficient local time and longitudinal variations to affect the semidiurnal tide observed in polar mesopause regions.

PI试图了解北极和南极的中间层/低热层（MLT）区域的动态，特别强调起源于较低高度的过程。 首先，他专注于涉及以下现象的起源和季节性行为：（a）纬向波数s=1的12小时振荡，（B）迁移的日潮，（c）周期在1.5和10天之间的向东传播波，以及（d）周期在6和11.5小时之间的日内振荡。 利用全球尺度波动模型和非线性含时谱动力学模型，研究者们得到了这些极区波动现象的可能机制。 此外，他还对来自全球卫星的臭氧密度数据进行分析，这将有助于确定臭氧对太阳辐射的吸收是否具有足够的当地时间和纵向变化，以影响在极地中层顶区域观测到的半日潮。