Ambient Level Hydroxyl Radical (OH) Detection Using Broadband Cavity Enhanced Absorption Spectroscopy (BBCEAS) in an Open-Path Configuration

在开放路径配置中使用宽带腔增强吸收光谱 (BBCEAS) 进行环境水平羟基自由基 (OH) 检测

• 批准号: 2114655
• 负责人: Jaron Hansen
• 金额: $ 39.86万
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2114655&HistoricalAwards=false
• 关键词: Ambient; Level; Hydroxyl; Radical; OH

This project supports the development and testing of an open-path, broad band cavity-based absorption spectrometer (BBCEAS) to measure hydroxyl radicals (OH) at ambient concentrations in the atmosphere. Hydroxyl radicals are one of the most important oxidizing species in the lower atmosphere, controlling the atmospheric lifetimes of many gases and reacting with both natural and anthropogenic hydrocarbons leading to the production of pollutant ozone. If successful, this instrument will provide data that can be used to improve the accuracy of models so that there will be better agreement between modeled and experimentally measured concentrations of OH and volatile organic compounds (VOC) and their photooxidation products, such as ozone.In order to build the new instrument to quantify OH radical concentrations, an open-cavity design is required. The principal investigators will conduct experiments to characterize the effects of turbulence and aerosols as well as include the effects of horizontal wind on the quantification of OH using the open-cavity design. They will then interface a high-resolution spectrometer to the open cavity BBCEAS instrument and test the initial configuration of the instrument and spectrograph/detector in the atmospheric simulation chamber at BYU. If the instrument is able to achieve an adequate limit of detection (LOD), the next step will be to test it in the field and intercompare it with other methods for measuring OH in the atmosphere.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.

该项目支持开发和测试开放路径、基于宽带腔的吸收光谱仪(BBCEAS)，以测量大气中环境浓度下的羟基自由基(OH)。羟基自由基是低层大气中最重要的氧化物种之一，它控制着许多气体的寿命，并与天然和人为的碳氢化合物发生反应，导致污染物臭氧的产生。如果成功，这台仪器将提供可用于提高模型精度的数据，以便在模拟和实验测量的OH和挥发性有机化合物(VOC)及其光氧化产物(如臭氧)的浓度之间有更好的一致性。为了建立新的仪器来定量OH自由基浓度，需要一个开腔设计。主要研究人员将进行实验，以确定湍流和气溶胶的影响，并包括水平风对使用开腔设计的OH的量化的影响。然后，他们将把一台高分辨率光谱仪连接到开腔BBCEAS仪器上，并在杨百翰大学的大气模拟舱中测试仪器和光谱仪/探测器的初始配置。如果该仪器能够达到足够的检测极限(LOD)，下一步将是在现场对其进行测试，并将其与其他测量大气中OH的方法进行比较。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Absorption cross-sections for the 5th and 6th vibrational overtones in a series of short chained alcohols using incoherent broadband cavity enhanced-absorption spectroscopy (IBBCEAS)

使用非相干宽带腔增强吸收光谱 (IBBCEAS) 绘制一系列短链醇中第五和第六振动泛音的吸收截面

• DOI: 10.1016/j.jms.2023.111746
• 发表时间: 2023
• 期刊: Journal of Molecular Spectroscopy
• 影响因子: 1.4
• 作者: Flowerday, Callum E.;Bhardwaj, Nitish;Thalman, Ryan;Asplund, Matthew C.;Sevy, Eric T.;Hansen, Jaron C.
• 通讯作者: Hansen, Jaron C.