'The quantification of changes in supraglacial conditions on the Greenland Ice Sheet and implications for surface drainage development'

主管：约克大学环境系大卫里平博士共同导师：安德鲁·索尔博士（谢菲尔德大学地理系）和斯蒂芬·利文斯通博士（谢菲尔德大学地理系）在融化季节，由于表面融化，格陵兰冰盖消融区（GrIS）形成了广泛的冰上水道和湖泊网络。这些排水元件是重要的，因为它们有可能通过冰臼将大量的水输送到冰床，在那里它可以影响冰流速。然而，这些排水元素的演变速度有多快，以及水可以穿过并进入GrIS的效率在很大程度上是未知的，因为到目前为止，还没有足够高的时间和空间分辨率的研究来确定这一点。该提案旨在通过结合使用遥感和实地技术，首次探索和量化这种排水演变的性质。通过这种方式，我们将探索在融化季节及以后发生的地表变化。具体而言，该项目的目标是：收集卫星图像及航空摄影资料，以探讨排水系统发展及演变的时间及空间变化。利用卫星图像（中分辨率成像分光仪），以探讨地面反射率及其他参数的变化，作为排水系统发展的潜在控制因素。利用延时图像（实地办法）探索地表条件和排水路径的演变量化融化季节过程中发生的变化。探索相对排水稳定性或动力学背后的控制机制。其目的是将演变的冰上排水的高分辨率记录与气象联系起来。变量和冰动力学评估（通过与白色玫瑰协会的联系，该协会涉及所有监督员）

Lead supervisor: Dr David Rippin Environment Department, University of YorkCo-supervisors: Dr Andrew Sole (Department of Geography, University of Sheffield) and Dr Stephen Livingstone (Department of Geography, University of Sheffield)During the melt-season, extensive networks of supraglacial channels and lakes develop in the ablation area of the Greenland ice sheet (GrIS) as a consequence of surface melting. These drainage elements are important since they have the potential to transmit large volumes of water to the ice bed via moulins where it can impact on ice flow rates. However, how quickly these drainage elements evolve, and thus the efficiency with which water can be transited across and into the GrIS, is largely unknown, as to date, there have been no studies of sufficiently high temporal and spatial resolution to determine this. This proposal seeks to be the first to explore and quantify the nature of such drainage evolution through the use of a combination of remote sensing and field-based techniques. In this way, we will explore changes at the surface that take place over the course of a melt season and beyond. In detail, the aims of this project are:To gather satellite images and airborne photography to explore the temporal and spatial variations in drainage development and evolution.To use satellite imagery (MODIS) to explore variations in surface albedo and other parameters as potential controls on drainage development.To use time-lapse imagery (field-based approaches) to explore evolution of surface conditions and drainage pathwaysTo quantify the changes that take place over the course of a melt season.To explore the controlling mechanisms behind relative drainage stability or dynamics.It is the intention to relate the high resolution record of evolving supraglacial drainage that will result to meteorological variables and an assessment of ice dynamics (via links with a White Rose Consortium that involves all of the supervisors)