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）计划旨在确定对流层化学，冰冻圈和海洋环境的化学，物理和生物交换过程的重要性，以及气候变化背景下的反馈机制。作为OASIS 2009的一部分，将在阿拉斯加的巴罗部署一套综合仪器，以便对交换过程及其对上层大气的影响进行迄今为止最全面的研究。部署将包括测量北极边界层光化学中活跃的关键化学物种，包括HOx、NOx/NOy、O3、卤烃、有机物和气溶胶，以及光化辐射等驱动环境因素。该项目将利用迄今获得的最全面的一套测量数据，详细研究背景条件下和卤素活度升高期间相关化学族之间复杂的光化学相互作用。这些数据还将大大促进对北极对流层总体氧化能力、地表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，卤素和氮氧化物排放的参数化将纳入CAM-Chem（一个全球化学运输模式），用于研究区域和半球尺度的空气质量影响，社区气候系统模式将用于进行气候变化对绿洲气候变化影响的初步研究。最初的一个主要重点将是改变海冰特征，特别是第一年的海冰，它已被证明与卤素激活相关。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，并将为参加使命的其他大学学生的教育经验做出贡献。该项目还将充分包括两个SOARS（大气研究和科学的重要机会）的门徒和丹佛地区的高中教师在现场测量计划，并将参加在巴罗和阿拉斯加北坡附近社区的推广活动。

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.