Polar Mesospheric Clouds and Their Atmospheric Environment

极地中层云及其大气环境

• 批准号: 9204845
• 负责人: Gary Thomas
• 金额: $ 28.5万
• 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: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204845&HistoricalAwards=false
• 关键词: Polar; Mesospheric; Clouds; Their; Atmospheric

The research activity under this proposal will consist of a combination of theoretical modeling and data analysis. Its primary objective is to gain an increased understanding of the energetics and dynamics of the atmospheric region situated between heights of 50 and 100 km. It will consist of an indepth study of Polar Mesospheric Clouds (PMC), a phenomenon which is a prominent manifestation of the energetics and dynamics in the summertime polar mesopause region near 84 km height. New modeling techniques which we have previously developed for simulating PMC evolution and optical properties will be combined with existing dynamical-photochemical models for the thermal and compositional structure of this atmospheric region. Newly- available satellite measurements of atmospheric properties will be used to develop a diagnostic model of the region's thermal, dynamical and transport processes. A second objective will be to determine the extent to which long-term anthropogenic changes in chemical composition of the lower atmosphere has impacted the thermal and dynamical structure of this region. In particular, we will develop both empirical and first-principles modeling methods to support our recent hypothesis that PMC is a relatively recent phenomenon, an indirect result of rising levels of tropospheric methane.

该提案下的研究活动将包括理论建模和数据分析的结合。 它的主要目的是对位于50至100 km之间的大气区域的能量和动力学有了更多的了解。 它将由对极性云（PMC）的深入研究组成，这是一种现象，是夏季极性间隙区域中高度84 km的夏季极性中间区域中能量和动力学的明显表现。 我们以前开发用于模拟PMC演化和光学性质的新建模技术将与该大气区域的热和组成结构的现有动力学模化模型相结合。 大气特性的新卫星测量将用于开发该地区热，动力和运输过程的诊断模型。 第二个目标将是确定低大气化学组成的长期人为变化的程度，影响了该区域的热和动力学结构。 特别是，我们将开发经验和第一原理建模方法，以支持我们最近的假设，即PMC是一种相对较新的现象，这是对流层甲烷水平上升的间接结果。