A multi-faceted evaluation of aerosol impacts on Arctic clouds

气溶胶对北极云层影响的多方面评估

• 批准号: 1203902
• 负责人: Gijs de Boer
• 金额: $ 28.95万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203902&HistoricalAwards=false
• 关键词: multi; faceted; evaluation; aerosol; impacts

The project will utilize results from several Arctic measurement sites, including long-term observations at Barrow, Alaska, and shorter-term observations from Summit, Greenland, and two measurement campaigns over the Arctic Ocean to improve upon previous estimates of Arctic aerosol-cloud interactions. To do this a critical first step will involve understanding the conditions under which surface aerosol conditions, as generally used in the compilation of statistical datasets addressing this issue, are comparable to those at cloud level. Using a variety of techniques, the distinction between surface-coupled and decoupled cloud states will focus evaluation of aerosol-cloud interactions on appropriate cases, reducing statistical contamination. From these cases, a statistical evaluation will be performed to reveal co-variation between key cloud (e.g. liquid water path, ice water path) and aerosol (e.g. concentration, size, hygroscopicity) properties. Combined with surface radiation measurements and idealized radiative transfer simulations, the results from this evaluation will provide an improved estimate of the net radiative impact of aerosols on Arctic clouds. Additionally, it will provide an overview of the seasonal evolution and surface-state dependence of these relationships. Outreach plans include several visits to Arctic regions, with a focus on the North Slope of Alaska and Greenland. The primary aim of these visits is to disseminate information relevant to the proposed research to seminar audiences consisting of local people (including underrepresented native people), primary school students, and local officials. A secondary aim of these visits is to give Arctic researchers (particularly early career researchers) who have never had a chance to visit the Arctic themselves an opportunity to see firsthand the region on which their efforts focus. This project will also support two early career scientists at the University of Colorado.

该项目将利用几个北极测量点的结果，包括阿拉斯加巴罗的长期观测和格陵兰萨米特的短期观测，以及北冰洋上空的两次测量活动，以改进以前对北极气溶胶-云相互作用的估计。要做到这一点，关键的第一步将涉及了解在何种条件下，地面气溶胶条件（通常用于汇编处理这一问题的统计数据集）可与云水平的气溶胶条件进行比较。使用各种技术，表面耦合和解耦云状态之间的区别将集中在适当的情况下，减少统计污染的气溶胶-云相互作用的评价。根据这些情况，将进行统计评估，以揭示关键云（例如液态水路径、冰水路径）和气溶胶（例如浓度、大小、吸湿性）属性之间的共同变化。结合地面辐射测量和理想化的辐射传输模拟，这项评估的结果将提供一个更好的估计气溶胶对北极云层的净辐射影响。此外，它将提供这些关系的季节演变和表面状态依赖的概述。 外联计划包括对北极地区的几次访问，重点是阿拉斯加北坡和格陵兰岛。这些访问的主要目的是向研讨会的听众传播与拟议研究有关的信息，这些听众包括当地人（包括代表性不足的土著人）、小学生和地方官员。这些访问的第二个目的是让从未有机会亲自访问北极的北极研究人员（特别是早期职业研究人员）有机会亲眼看到他们努力关注的地区。 该项目还将支持科罗拉多大学的两名早期职业科学家。