Collaborative Research: Evaluation of Aerosol-Cloud-Radiation Processes and Feedbacks in the Alaskan Arctic

合作研究：阿拉斯加北极气溶胶云辐射过程和反馈的评估

• 批准号: 0649570
• 负责人: Timothy Garrett
• 金额: $ 32.41万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0649570&HistoricalAwards=false
• 关键词: Collaborative; Research; Evaluation; Aerosol; Cloud

The climate of the Arctic is changing rapidly for reasons that are poorly understood. It is generally recognized that low-level cloud cover is a controlling factor in any feedbacks that amplify the rate of change. However, any assessment of the relevant mechanisms at play requires accurate long-term statistical representations of Arctic cloud properties and variability. Past efforts used long-term seasonal data to quantify indirect aerosol amplification to Arctic surface warming: thermal insulation of the surface by low-level Arctic stratus is increased in the presence of mid-latitude aerosol pollution. This new effort aims to expand our understanding of this phenomenon, and Arctic clouds in general, by analyzing long-term data sets collected at the Department of Energy North Slope of Alaska - Adjacent Arctic Ocean, and National Oceanic and Atmospheric Administration, long-term monitoring sites near Barrow, Alaska. Activities will include a) development of new, and refinements to existing, remote-sensing cloud retrieval algorithms for application to Arctic studies; b) derivation of long-term seasonal databases of pollution, low-cloud microstructures, phase, precipitation, and radiative properties, and c) isolation of the component mechanisms that control cloud, aerosol and precipitation interactions in the Arctic. These efforts will result in a deepened understanding of the response of Arctic haze phenomena to a projected warmer, wetter Arctic. The broader impacts of this study are development of new techniques for studying Arctic climate and component processes, web-based dissemination of results of analysis of changing cloud conditions in the Arctic, collaborations between different government agencies and university researchers, undergraduate and graduate student training, and contribution to the broad goals of the 2007 to 2008 International Polar Year.

北极的气候正在迅速变化，其原因尚不清楚。 人们普遍认为，在任何放大变化率的反馈中，低空云量是一个控制因素。然而，对相关机制的任何评估都需要对北极云的特性和变化进行准确的长期统计。 过去的努力使用长期的季节性数据来量化间接气溶胶放大北极表面变暖：在中纬度气溶胶污染的存在下，低层北极层云增加了表面的隔热作用。 这项新的努力旨在扩大我们对这种现象的理解，以及一般的北极云，通过分析在阿拉斯加北坡能源部收集的长期数据集-邻近北冰洋，以及国家海洋和大气管理局，阿拉斯加州巴罗附近的长期监测站点。 活动将包括：（a）开发新的和改进现有的遥感云检索算法，以应用于北极研究;（B）建立污染、低云微结构、相态、降水和辐射特性的长期季节性数据库;（c）分离控制北极云、气溶胶和降水相互作用的组成机制。 这些努力将加深对北极烟霾现象对预计的更温暖、更潮湿的北极的反应的理解。 这项研究的更广泛的影响是开发研究北极气候和组成过程的新技术，在网上传播北极云状况变化的分析结果，不同政府机构和大学研究人员之间的合作，本科生和研究生的培训，以及对2007年至2008年国际极地年的广泛目标的贡献。