Determination of Local Hydroxyl Concentrations

局部羟基浓度的测定

• 批准号: 8900058
• 负责人: Malcolm Campbell
• 金额: --
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8900058&HistoricalAwards=false
• 关键词: Determination; Local; Hydroxyl; Concentrations

Three techniques have been used for measurements of hydroxyl radical (OH) concentrations: laser induced fluorescence (LIF), the direct, long path absorption (LPA) method, and the 14C tracer method. To be usefully applied to atmospheric measurements, detection systems must be sensitive enough to measure low OH concentrations, must gave reasonable signal-to-noise ratios, and have the capacity to discriminate against chemical and physical interferences. They must be absolute or susceptible to calibration. Attainment of these goals must be feasible under a variety of environmental conditions. This research project will evaluate the potential to measure local diurnal OH concentration cycles to a precision of 20 percent using integration times of 100 seconds. Calibration of the method is not required. 14C method, in collaboration with other groups measuring significant trace gas concentrations in the atmosphere, to make careful checks on the validity of current models of tropospheric photochemistry. Some intercomparisons of OH measurements with those of other techniques, using scientifically defensible protocols, and the collection of preliminary statistics on temporal and spatial variability of OH near ground level will also be carried out.

三种技术已用于测量羟基自由基（OH）浓度：激光诱导的荧光（LIF），直接的，长路径吸收（LPA）方法和14C示踪方法。要有效地应用于大气测量，检测系统必须足够敏感以测量低OH浓度，必须给出合理的信噪比，并且具有区分化学和物理干扰的能力。它们必须绝对或容易受到校准。在各种环境条件下，必须实现这些目标是可行的。该研究项目将使用100秒的整合时间评估将局部昼夜OH浓度周期测量20％的潜力。不需要该方法的校准。 14C方法与其他测量大气中显着的痕量气体浓度的组合作，以仔细检查对流层光化学的当前模型的有效性。使用科学辩护的方案以及对OH OH接近地面水平的时间和空间可变性的初步统计，也将进行一些与其他技术的OH测量相间隔对象。