Collaborative research: Spatial and temporal variability of surface albedo and light absorbing chemical species in Greenland.

合作研究：格陵兰岛表面反照率和光吸收化学物质的时空变化。

• 批准号: 1203876
• 负责人: Jack Dibb
• 金额: $ 29.03万
• 依托单位: University of New Hampshire
• 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=1203876&HistoricalAwards=false
• 关键词: Collaborative; research; Spatial; temporal; variability

The collaborative team will take advantage of the currently funded Greenland Inland Traverse (GrIT) traveling between Thule and Summit Greenland to access a spatially diverse area of the GIS in order to better understand albedo variability and the snow properties that influence albedo. The GrIT route offers a unique opportunity to study a wide range of snow accumulation zones (i.e. the ablation zone, soaked snow zone, the percolation zone and the dry snow zone) across Greenland, which are expected to have a broad range of albedo values as well as significant variability in snow physical properties and concentrations of light absorbing compounds (i.e. dust, elemental carbon, and brown carbon). The project's field component will take place over two seasons during the spring of 2013 and 2014. The approach will include stopping along the traverse to collect coincident daily measurements of snow spectral albedo, snow physical properties (i.e. specific surface area, density), surface snow light absorption properties (i.e. wavelength dependent absorption of water soluble compounds and particulates), and the concentrations of trace elements, organic, and elemental carbon. Additionally, the temporal evolution of spectral albedo will be monitored continuously during the sunlit months using autonomous stations deployed along the traverse route to track seasonal variations of snow albedo and to help attribute these variations to the physical and chemical composition of the snow. The results of this project will yield a unique data set characterizing the temporal and spatial variability of surface albedo as well as the physical and chemical properties of Greenland snow, which are broadly useful to both modeling, ice mass balance, and remote sensing communities. Conference presentations, rapid publication of results, and most importantly close collaboration with modelers, (i.e. through work with the CESM PCWG) will ensure that this knowledge used to improve process parameterizations in predictive global climate models. The team will also build on international collaborations begun in the Dartmouth IGERT program, including a week-long ambassadorship to Nuuk by co-PI Polashenski including lectures at the college and Katuuaq cultural center. Graduate, undergraduate, and high school student training will also be included in the project.

合作小组将利用目前资助的格陵兰内陆导线(GRIT)在图勒和格陵兰峰会之间旅行，访问地理信息系统空间多样化的区域，以便更好地了解反照率的可变性和影响反照率的雪特性。GRIT路径提供了一个独特的机会来研究整个格陵兰范围广泛的积雪区(即消融区、浸雪区、渗滤区和干雪区)，预计这些积雪区的反照率值范围很大，雪的物理性质和吸光化合物(即灰尘、元素碳和棕色碳)的浓度也有很大的变异性。该项目的实地部分将在2013年春季和2014年春季分两个季节进行。该方法将包括沿导线停下来收集雪光谱反照率、雪物理性质(即比表面积、密度)、表面雪光吸收性质(即水溶性化合物和颗粒的波长相关吸收)以及微量元素、有机和元素碳浓度的每日一致测量结果。此外，在阳光充足的月份，将使用沿导线布设的独立站连续监测光谱反照率的时间演变，以跟踪雪反照率的季节变化，并帮助将这些变化归因于雪的物理和化学成分。该项目的结果将产生一个独特的数据集，描述地面反照率的时间和空间变异性以及格陵兰雪的物理和化学性质，这对建模、冰块平衡和遥感社区都是广泛有用的。会议报告、快速发布结果，以及最重要的是与建模人员的密切合作(即通过与CESM特设工作组的合作)，将确保这些知识用于改进预测全球气候模型的过程参数。该团队还将在达特茅斯IGERT项目开始的国际合作的基础上再接再厉，包括由合作者Pi Polashenski担任为期一周的努克大使，包括在学院和Katuaq文化中心的讲座。研究生、本科生和高中生的培训也将包括在该项目中。