VPW: An Investigation of Sea Salt Aerosol Reactions Important to Chlorine Cycling in the Marine Troposphere (Atmospheric Chemistry)

该项目的目标是研究可能 从海盐气溶胶中产生气相氯原子-- 大气化学中的一个问题， 通过PI和她的专业知识的结合， 在哈佛的合作者。 四个潜在的重要反应将 进行研究，采用两种不同的实验方法， 这些表面反应的研究。 第一种方法将 涉及研究候选反应，使用大面积 可以在相对较高的温度下研究的面积/体积表面 压力 第二种理解这些的方法 反应及其机制将涉及研究以及 其特征在于单晶表面在低压下，使用状态- 最先进的表面科学光谱技术 尽管 然而，这种方法并没有被利用， 研究与大气相关的表面反应。 一 本文设计了一系列的系统研究 为了确定四种反应中的每一种在产生气体中的作用， 海盐气溶胶中的氯原子。 实体就雇员 对流层的化学反应将被确定 使用对流层的综合理论模型， 化学. 了解可能产生气相的机制 海盐气溶胶中的氯原子可能会极大地影响我们的 对流层化学的理解和基础， 重要的社会决策，如污染的设计 控制和制定安全的氟氯化碳替代品 （这是造成臭氧层急剧流失的原因。 南极）。 该项目进一步推动了VPW计划的目标， 妇女在科学领域发展事业的机会， 通过研究进行工程设计，并鼓励其他女性 追求职业生涯在这些领域通过调查员的增强 作为东道校园的榜样。 拟议 有助于实现第二个目标的活动包括： 组织和赞助一个指导计划，为研究生和 理工科女大学生; 组织午餐时间专题讨论会， 科学和工程;开发和提供一系列 为大学生开设的讲座，主题是当前感兴趣的， 化学界;提供一个部门研讨会， 年内取得的研究成果;与 在追求研究目标的同时， 项目

This project's goal is to investigate mechanisms which may produce gas phase chlorine atoms from sea salt aerosols--a problem in atmospheric chemistry with a unique approach made possible by the combination of expertise of the PI and her collaborators at Harvard. Four potentially important reactions will be investigated, applying two different experimental approaches to the study of these surface reactions. The first approach will involve studying candidate reactions, using large surface area/bulk surfaces that may be investigated at relatively high pressures. The second approach toward understanding these reactions and their mechanisms will involve studies of well characterized single crystal surfaces at low pressure, using state- of-the-art surface science spectroscopic techniques. Despite its advantages, this latter approach has not been exploited in investigations of surface reactions of atmospheric relevance. A series of systematic studies outlined in the proposal are designed to determine the role of each of four reactions in producing gas phase chlorine atoms from sea salt aerosols. The impact of these reactions on the chemistry of the troposphere will be determined using a comprehensive theoretical model of tropospheric chemistry. Understanding mechanisms which may produce gas phase chlorine atoms from sea salt aerosols could greatly impact our understanding of tropospheric chemistry and the basis for important societal decisions such as the design of pollution controls and formulation of safe alternatives to chlorofluorocarbons (which are responsible for dramatic losses of ozone in the Antarctic). This project furthers VPW program objectives to provide opportunities for women to advance their careers in science or engineering through research, and to encourage other women to pursue careers in these areas through the investigator's enhanced visibility as a role model on the host campus. The proposed activities which contribute to the second objective include: organizing and sponsoring a mentoring program for graduate and undergraduate women in the sciences and engineering; organizing a lunch time symposium featuring women active in science and engineering; developing and delivering a series of lectures geared for undergraduates on topics of current interest to the chemical community; delivering a departmental seminar on the research results obtained during the year; and interacting with faculty and students while pursuing the goals of the research project.