CAREER: Nocturnal Chemistry in the Urban Boundary Layer: Investigation of Heterogeneous Surface Chemistry and Chemical-Transport Processes

该项目将调查和量化夜间大气动力学和化学在城市环境中的重要性，重点是氮的活性氧化物、氧化自由基和非均相反应过程的化学。在两项实地研究中，将使用微分光学吸收光谱(DOAS)以及由现场仪器(包括气溶胶质谱仪)、GPS无线电探空仪和光探测和测距(激光雷达)提供的辅助测量来表征夜间化学和混合。一维和三维模拟实验将通过确定夜间垂直混合过程在控制城市地区化学反应和空气质量方面的作用，将这些观察结果置于与政策相关的背景下。这项研究的更广泛的科学影响将是改善对夜间化学反应和混合过程的理解，以便在城市和区域空气质量模型中以更具代表性的方式模拟它们。这样的改进将导致未来更有效的控制战略和知情的政策决策。除了直接指导研究生和本科生的研究外，P.I.还将把他的研究整合到一些教育和社区推广倡议中。需要为一名研究生提供支持，该项目将对他们的专业培训做出重大贡献。

This project will investigate and quantify the importance of nocturnal atmospheric dynamics and chemistry in an urban environment, with emphasis on the chemistry of reactive oxidized oxides of nitrogen, oxidizing radicals and heterogeneous reaction processes. During two field studies differential optical absorption spectroscopy (DOAS) along with ancillary measurements provided by in situ instruments (including an aerosol mass spectrometer), GPS radiosondes, and a light detection and ranging (lidar) will be used to characterize nighttime chemistry and mixing. One- and three-dimensional modeling experiments will place those observations in a policy-relevant context by defining the role of nocturnal vertical mixing processes in controlling chemical reactions and air quality in urban areas. The broader science impact of this research will be an improved understanding of nighttime chemical reactions and mixing processes so that they can be emulated in a more representative fashion within urban and regional air quality models. Such improvements will lead to more effective control strategies and informed policy decisions in the future. In addition to direct mentoring of graduate and undergraduate student research the P.I. will integrate his research into a number of education and community outreach initiatives. Support is requested for one graduate student and this project will contribute substantially to their professional training.