The OASIS-2009 Field Mission: Studies of Photochemistry and Trace Gas Exchange in the Arctic in the Context of a Changing Climate

OASIS(海洋/大气/海冰/积雪)计划旨在确定化学、物理和生物交换过程对对流层化学、冰冻圈和海洋环境的重要性，以及它们在气候变化背景下的反馈机制。作为2009年绿洲计划的一部分，将在阿拉斯加州巴罗部署一套综合仪器，以便对交换过程及其对上方大气的影响进行迄今最全面的研究。部署将包括对北极边界层光化学中活跃的关键化学物种的测量，包括Hox、NOx/NOy、臭氧、卤代烃、有机物和气溶胶，以及驱动环境因素，如光化辐射。该项目将利用迄今获得的最全面的一套测量结果，详细研究背景条件和卤素活度升高期间有关化学族之间的复杂光化学相互作用。这些数据还将大大促进对北极对流层的整体氧化能力、地面臭氧消耗事件以及该区域气溶胶产生的性质和重要性的了解。此外，将把卤素和氮氧化物排放的参数化纳入全球化学输送模式(CAM-Chem)，用于研究区域和半球尺度的空气质量影响，并将利用社区气候系统模式(CCSM)进行一些关于气候变化对绿洲进程的影响的首批研究。最初的一个主要重点将是改变海冰的特征，特别是已被证明与卤素活化有关的第一年海冰。更广泛的影响包括至少一名研究生和一名博士后研究员的参与，并将有助于其他参与该任务的大学生的教育经验。该项目还将把两名SORAS(大气研究和科学重大机遇)门生S和一名丹佛地区的高中教师完全纳入野外测量计划，并将参加巴罗和阿拉斯加北坡附近社区的外联活动。

The OASIS (Ocean/Atmosphere/Sea Ice/Snowpack) program aims to determine the importance of chemical, physical and biological exchange processes on tropospheric chemistry, the cryosphere, and the marine environment, and their feedback mechanisms in the context of a changing climate. As part of OASIS 2009, an integrated suite of instruments will be deployed at Barrow, Alaska, that will allow for the most comprehensive study to date of exchange processes and their impact on the overlying atmosphere. The deployment will consist of measurements of key chemical species active in the Arctic boundary layer photochemistry, including HOx, NOx/NOy, O3, halocarbons, organics and aerosols, as well as driving environmental factors such as actinic radiation. The project will result in a detailed study of the complex photochemical interactions between the relevant chemical families during background conditions and during periods of elevated halogen activity, using the most comprehensive set of measurements obtained to date. The data will also significantly advance the understanding of the overall oxidative capacity of the Arctic troposphere, of surface ozone depletion events, and of the nature and importance of aerosol production in this region. In addition, parameterizations of the emissions of halogens and NOx will be incorporated into CAM-Chem (a global chemistry-transport model) for studies of regional- and hemispheric-scale air quality impacts, and the Community Climate System Model (CCSM) will be used to conduct some of the first studies of the impact of climate change on OASIS processes. A major initial focus will be on changing sea ice characteristics, and in particular first-year sea ice which has been shown to correlate with halogen activation. The Broader Impacts include the participation of at least one graduate student and one postdoctoral fellow, and will contribute to the educational experience for other University students participating in the mission. The project will also fully include two SOARS (Significant Opportunities in Atmospheric Research and Science) protégés and a Denver-area high school teacher in the field measurement program, and will take part in outreach activities in Barrow and nearby communities on the North Slope of Alaska.