Collaborative Research: Nitrate (NO3) Induced Nighttime Air Chemistry

虽然通常通过日间光解、水相和气溶胶吸附快速去除，但反应性NO3自由基在挥发性有机化合物如生物源烃（例如萜烯、醇）的氧化中起着难以捉摸的作用，特别是在夜间，并且另外在NOx物质转化为硝酸（HNO3）中起着难以捉摸的作用。来自内华达州DRI大学和霍华德大学的研究人员将进行为期四周的实地测量活动，并进行一系列分析和建模工作，以评估城市沙漠环境中的NO3自由基化学。 据推测，在低湿度条件下，普遍存在于干旱地区也受到城市来源的NO2和O3，一个更明确的测量NO3和它的损失过程比可以在更潮湿的环境中观察到的将是可行的。 夜间和白天的城市研究地点（里诺，内华达州）的化学将其特征在于一系列的直接和间接的化学测量技术，允许NO3自由基预算的评估。 受测量参数约束的数据将用箱模型进行分析，以确定是否有可能解释已知或假设的硝酸根损失机制。

Although normally rapidly removed through daytime photolysis, aqueous phase and aerosol sorption, the reactive NO3 radical plays an elusive role in the oxidation of volatile organic compounds such as biogenic hydrocarbons (e.g. terpenes, alcohols) especially at night, and additionally in the conversion of NOx species to nitric acid (HNO3). Investigators from University of Nevada DRI and Howard University will conduct a four week field measurement campaign together with a series of analysis and modeling efforts to evaluate NO3 radical chemistry in an urban desert setting. It is hypothesized that in low humidity conditions, prevalent in arid regions also subject to urban sources of NO2 and O3, a more definitive measurement of NO3 and its loss processes than can be observed in more humid environments will be practicable. Both nighttime and daytime chemistry of the urban study site (Reno, NV) will be characterized by a range of direct and indirect chemical measurement techniques allowing the evaluation of NO3 radical budgets. The data, constrained by measured parameters, will be analyzed with box models to see if it is possible to account for known, or postulated, nitrate radical loss mechanisms.