Global S&T Development Trend Analysis Platform of Resources and Environment
项目编号 | 1651450 |
CEDAR: Critical Evaluation of the Hydroxyl Radical (OH) Meinel Band Einstein A Coefficients | |
Tom Slanger | |
主持机构 | SRI International |
项目开始年 | 2017 |
2017-09-15 | |
项目结束日期 | 2020-08-31 |
资助机构 | US-NSF |
项目类别 | Continuing grant |
项目经费 | 69669(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | The Meinel band nightglow emission from the OH molecule has been used for decades to characterize mesospheric temperatures. Aeronomers currently rely on emission coefficients ("A coefficients") that the PIs argue are in need of revision. Temperatures recovered using the existing set of A coefficients differ by up to 15 K from actual temperatures computed from first principles. Large uncertainty in the mesospheric temperature can have detrimental effects on modeling chemistry, transport and circulation of the mesosphere and lower thermosphere (MLT). The uncertainties also undermine efforts to monitor the long-term temperatures in the MLT. This proposal addresses the OH temperature determination by 1) using intensity-calibrated nightglow data that has been collected simultaneously over a large spectral range from astronomical sky spectra; 2) making comparisons between such recently obtained OH Meinel band line intensities, and the most recent first principles calculations of the emission coefficients. This research will contribute to understanding fundamental physical quantum processes, atmospheric motions on small and large scales, and long-term temperature change in the lower thermosphere. |
URL | 查看原文 |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/71971 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Tom Slanger.CEDAR: Critical Evaluation of the Hydroxyl Radical (OH) Meinel Band Einstein A Coefficients.2017. |
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