Laboratory Study of H + O3 Product Yields Relevant to the Mesosphere

与中间层相关的 H O3 产物产率的实验室研究

• 批准号: 1757944
• 负责人: Daniel Matsiev
• 金额: $ 48.96万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1757944&HistoricalAwards=false
• 关键词: Laboratory; Study; O3; Product; Yields

The goal of this research is to close these information gaps. The researchers will adapt their laboratory hardware to measure the fractional yields of vibrationally excited OH in the range of 150-300 K. This information is needed to accurately recover temperatures from satellite and ground-based observations of OH airglow. Knowledge of mesopause temperature is particularly important for quantifying the heat budget of this atmospheric region, and for monitoring long-term trends.At altitudes around 87 km, the exothermic H + O3 reaction produces vibrationally excited hydroxyl (OHv). This molecule radiates visible and near infrared light ("airglow") from which it is possible infer atmospheric density, temperature, and species concentrations. The OHv molecule is therefore an extremely valuable observable in the mesopause. Although the total reaction rate coefficient of H + O3 is well known, estimates of the vibrational OH product yields vary considerably. Moreover, the temperature dependence of these yields has never been determined for conditions relevant to the mesosphere.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项研究的目的是缩小这些信息差距。研究人员将调整其实验室硬件，以测量150-300 K范围内的振动激发OH的分数。需要此信息以准确地从卫星和OH Airglow的地面观测中恢复温度。对介质温度的了解对于量化该大气区域的热预算尤其重要，并且对于监测长期趋势。在约87公里的高度时，放热的H + O3反应会产生振动激发的羟基（OHV）。该分子辐射可见的和近红外光（“气流”），从中可以推断出大气密度，温度和物种浓度。因此，OHV分子在中间是非常有价值的可观察到的。尽管H + O3的总反应速率系数众所周知，但振动OH产物的估计值差异很大。此外，这些收益率的温度依赖性从未确定与中层相关的条件。该奖项反映了NSF的法定任务，并认为使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估来获得支持。