Laboratory Studies of Tropospheric Sulfur Chemistry

该项目继续进行一系列实验室研究，调查对流层硫循环的基本性质、行为和特征。 主要目的是进一步研究生物还原硫化合物通过气相和水相氧化途径的机理和速率。 远海对流层低层中硫物种丰富，可能在海洋地球化学循环、新粒子形成和全球气候中发挥重要作用。 这项研究的结果将为明确定义这些角色提供更好的见解，并进一步改善对全球硫预算的限制。 实验和理论的元素。 实验室动力学研究将使用激光闪光光解和湍流管技术，并通过各种最先进的光谱测量/分析技术进行检测，包括化学离子质谱法。 一些理论从头计算机制的计算，并行和补充的实验方法也将进行。 这项基础研究的更广泛的科学影响对于促进我们对环境大气中硫的化学和循环的理解至关重要，并对更好地评估这些过程对全球气候的作用和影响产生进一步的影响。 该研究与教育和推广高度结合。 该项目支持两名全日制研究生和一些按小时计酬的本科生研究助理。 参加这个项目将大大有助于他们的研究、培训和专业发展。

This project continues a series of laboratory studies investigating fundamental properties, behavior and characteristics of the tropospheric sulfur cycle. The major objective is to further studies of the mechanisms and rates of biogenic reduced sulfur compounds through gas- and aqueous-phase oxidation pathways. Sulfur species are abundant in the remote marine lower troposphere and likely play important roles in biogeochemical cycling, new particle formation and global climate. Results from this study will offer improved insight on defining these roles explicitly and in doing so further improve constraints on the global sulfur budget. Experimental and theoretical elements are involved. Laboratory kinetic studies will use laser flash photolysis and turbulent flow tube techniques with detection by a variety of state-of-the-art spectroscopic measurement/analysis techniques, including Chemical Ion Mass Spectrometry (CIMS). Some theoretical ab initio mechanistic calculations in parallel and complementary to the experimental approach will also be conducted. The broader science impact of this fundamental research will be important to advancing our understanding of the chemistry and cycling of sulfur in the ambient atmosphere, with further implications for better assessing the role and impact of such processes on global climate. The research is highly integrated with education and outreach. The project supports two full-time graduate students and a number of undergraduate research assistant paid hourly. Participation in this project will contribute substantively to their research training and professional development.