Collaborative Research: Influences of Halogen Chemistry on Processing of North American Pollutant Outflow

认识到卤素化学的作用和阐明各种大气环境的细节，对于提高对包括平流层和北极边界层臭氧耗竭在内的若干过程的认识是很重要的。在对流层中，对卤素产生的详细机制以及除其他氧化剂外卤素存在的影响的了解尚不完整，需要进一步研究。该合作项目涉及来自四个机构的研究人员，将研究卤素化学在美国东北部海岸被污染的流出羽流中的作用，特别是卤素化学对臭氧收支的影响，对夜间自由基化学的影响，对气溶胶产生和演变的影响，以及对污染羽流与海洋边界层化学和物理过程的相互作用。这项工作将在2004年夏季研究的观测阶段通过一套全面的分析仪器来完成，测量重要的数量，然后对这些观测结果进行详细分析。该项目将利用并促进2004年夏季在国际运输与转型研究联合会（ICARTT）的支持下开展的多项实地活动。这将鼓励由NASA（洲际化学传输实验，INTEX-A）、NOAA（新英格兰空气质量研究-洲际传输和化学转化，NEAQS - ITCT 2004）和欧洲机构（洲际污染传输，ITOP）赞助的实地项目之间的协同作用。此外，新罕布什尔大学的AIRMAP（大气调查、区域模拟和预测）项目正在加强沿海岛屿上的测量站点，以促进这一努力。除了提高对低层大气中卤素化学过程的认识，从而提高预测未来大气变化的能力外，该项目还将培养研究生和本科生，并加强参与机构之间的伙伴关系。还将举行重要的公众宣传活动。

The recognition of the roles of halogen chemistry and elucidation of the details for various atmospheric environments has been important in improving understanding of a number of processes including ozone depletion in the stratosphere and in the Arctic boundary layer. In the troposphere, the understanding of detailed mechanisms for halogen production and the implications of the presence of halogens, in addition to other oxidants, is not complete and requires further study. This collaborative project involving researchers from four institutions will examine the role of halogen chemistry in the polluted outflow plume off the coast of the northeast U.S. In particular, the influence of halogen chemistry on the ozone budget, on nighttime radical chemistry, on aerosol production and evolution, and on the interaction of the pollution plume with marine boundary layer chemical and physical processes. This will be accomplished by a comprehensive suite of analytical instrumentation measuring important quantities during an observation phase of the study in the summer of 2004, followed by detailed analysis of these observations. This project will take advantage of, and contribute to, the multiple field campaigns taking place in the summer of 2004 under the umbrella of the International Consortium for Research on Transport and Transformation (ICARTT). This will encourage synergy between the field programs sponsored by NASA (Intercontinental Chemical Transport Experiment, INTEX-A), NOAA (New England Air Quality Study - Intercontinental Transport and Chemical Transformation, NEAQS - ITCT 2004), and European agencies (Intercontinental Transport of Pollution, ITOP). In addition, the AIRMAP (Atmospheric Investigation, Regional Modeling and Prediction) program at the University of New Hampshire is enhancing measurement sites on coastal islands to contribute to this effort.In addition to improving understanding of halogen chemical processes in the lower atmosphere, thus leading to enhanced ability to predict future changes in the atmosphere, this project will also train graduate and undergraduate students and strengthen the partnership between the participating institutions. There will also be significant public outreach activities.