Evaluation of the Effects of Recharge Rate Versus Changes in the Configuration of the Subglacial Hydrological System on Glacier Hydrology

杰森·格利博士获得了美国国家科学基金会地球科学博士后奖学金，将在剑桥大学开展一项研究和教育计划。这项研究将对一项广泛用于调查冰川水文系统结构的技术--染料追踪--进行首次独立评估；这是了解造成冰川水文学和冰川运动之间联系的物理过程的重要一步。该项目包括在融化季节开始和结束时绘制挪威斯瓦尔巴特群岛寒冷的Rieper冰川下的冰下管道(使用针对冰川改进的洞穴技术)。一旦完成初始地图，将通过管道进行一系列染料追踪实验，以确定通过清除积雪而重新充电速度的变化如何影响染料追踪数据。这项研究收集的管道水压力和流量数据将用于校准冰川水文模型，这些模型可以根据直接获得的管道数据进行评估。实验室模型将被用来调查冰下水文系统配置的变化如何影响水压和染料痕迹，因为这种类型的系统不太可能在物理上达到。这项实验室研究采用了石灰岩岩溶含水层中的管道形成模型，以研究管道形成如何影响冰下水压力的演变，以及影响冰川移动的速度。该项目使用实地调查来提供新的工具来解释染料追踪技术的结果，并使用实验室模型来了解融水输入如何可能增加冰川下的水压力并导致冰川更快地滑动。虽然这项研究对于了解冰川水文和冰川运动之间的联系很重要，但冰川洞穴也是视觉上令人惊叹的现场地点，令广大观众兴奋。格利博士将向国际流行媒体投稿，与公众分享他的研究成果。除了出版有关冰洞的文章外，他还将联合举办一场关于冰川洞穴安全和危险识别的年度讲座，面向普通公众和斯瓦尔巴群岛的洞穴导游。在斯瓦尔巴特群岛进行实地考察期间，古利博士将与东肯塔基州农村中学的学生交换电子邮件和照片，并回答有关北极的问题。最后，他将在剑桥大学教授一门本科生冰川学课程。

Dr. Jason Gulley has been awarded an NSF Earth Sciences Postdoctoral Fellowship to carry out a research and education plan at the University of Cambridge. This study will provide the first, independent assessment of a technique that is widely used to investigate the configuration of glacier hydrological systems, dye tracing; an important step in understanding the physical processes responsible for the links between glacier hydrology and glacier motion. The project includes mapping a subglacial conduit beneath the cold-based Rieper Glacier, in Svalbard, Norway (with caving techniques modified for glaciers) at the start and end of the melt season. Once the initial map is completed, a series of dye tracing experiments will be conducted through the conduits to determine how changes in the rate of recharge through the removal of the snowpack affect dye trace data. Conduit water pressure and discharge data collected from this study will be used to calibrate models of glacier hydrology which can be evaluated against directly obtained conduit data. Laboratory models will be used to investigate how changes in the configuration of subglacial hydrological systems affect water pressure and dye traces because this type of system is unlikely to be physically accessible. The laboratory study adapts models of conduit formation in limestone karst aquifers to investigate how conduit formation may affect the evolution of subglacial water pressure and influence how fast glaciers move. This project uses field investigations to provide new tools to interpret the results of dye tracing techniques and uses laboratory models to understand how meltwater inputs might increase subglacial water pressure and cause glaciers to slide faster. While this research is important for understanding links between glacier hydrology and motion, glacier caves are also visually stunning field sites that excite broad audiences. Dr. Gulley will share his research with the general public by contributing articles to international popular media outlets. In addition to publishing about ice caves, he will co-present an annual lecture on glacier cave safety and hazard recognition for the general public and cave guides in Svalbard. During fieldwork in Svalbard, Dr. Gulley will exchange emails and photographs and answer questions about the arctic with students at rural Eastern Kentucky middle schools. Lastly, he will teach an undergraduate glaciology course at the University of Cambridge.