Collaborative Research: History and Evolution of the Siple Coast Ice Stream System as Recorded by Former Shear-Margin Scars

9909469这个奖项为三年的资金提供支持，用于研究西南极西边海岸冰川系统中众所周知的疤痕状特征。拟议实地工作的目的是查明若干尚未发现的疤痕的性质，并进一步确定以前查明的、年代较差的边缘疤痕的特征。将使用先进的甚高分辨率辐射计(AVHRR)和雷达卫星图像数据来定位和绘制特征地图，并将它们置于区域背景中。这项研究试图描述西伯利亚海岸冰川的近代史，并调查它们形态变化的原因。主要的调查工具将是低频探地雷达和高频探地雷达剖面，以对内部地层进行成像，并测量埋藏的裂缝或破坏的分层的深度。这一点，再加上由浅冰芯确定的堆积率，将为边缘特征提供“关闭”年龄。现场数据将为活动剪切期间和关闭后边缘和冰间流脊的简单冰流模型提供输入参数。这个模型将估计关闭时SCAR的初始高程和当时相应的冰流高程。

9909469ScambosThis award provides support for three years of funding to study the scar-like features that are well-known from the Siple Coast ice stream system in West Antarctica. The objective of the proposed field work is to identify the nature of several as yet unvisited scars, and to further characterize previously-identified margin scars that are poorly dated. Advanced Very High Resolution Radiometer (AVHRR) and Radarsat image data will be used to locate and map the features, and place them in a regional context. The study seeks to describe the recent history of the Siple Coast glaciers and investigate the causes of their changes in configuration. The main investigative tools will be low-frequency RES and high-frequency ground penetrating radar (GPR) profiles to image internal layers and measure depths to buried crevasses or disrupted layering. This, coupled with accumulation rates determined from shallow ice cores, will provide "shutdown" ages for the margin features. The field data will provide input parameters for simple models of ice flow for margins and inter-ice stream ridges during active shearing and after shutdown. This modeling will estimate the initial elevation of a scar at the time of shut down and the corresponding ice stream elevation at that time.