Rapid Landscape Change in Garwood Valley: Monitoring Buried Glacier Melt and Exploring Pewe's Lost Lake

知识价值：最近在加伍德山谷，由于河流侵蚀，一个膨胀的地层柱暴露在一个埋藏的冰块中。这种lgm时代的冰是罗斯冰原的残余物，大约10-20年前填满了加伍德山谷，阻塞了一个最近发现的古湖泊。埋藏的冰块被保存在古湖泊沉积物、冰川漂移和永久冻土地貌的覆盖之下。叠加的沉积物提供了一米厚的景观变化记录，由于几个藻席化石和碳酸盐层的存在，可以很好地确定年代。pi建议量化加伍德谷古和现代气候驱动的景观变化速率。pi还建议量化加伍德谷目前埋冰移除的速率，以生成一个地形学基线，用于记录与未来冰移除相关的景观变化。对当前埋冰消融的测量和建模将量化当前由气候和景观之间的不平衡所引起的温带地区景观变化。这一建议将解决LGM冰盖在MDV南部填充山谷的时间和范围以及冰川从山谷中排水的速率和过程的模糊性。更广泛的影响：本项目将为本科生和研究生提供南极实地研究的机会。加伍德山谷发生的戏剧性融化将成为南极洲气候驱动景观变化的生动例子，将通过由公立学校教师和科学推广专家主持的现场电话会议，与K-12学生和广大公众分享。该项目将生成的数据将被合成为现场的3D导览，并配有专家解说，适合博物馆展示。

Intellectual Merit: An expansive stratigraphic column has recently become exposed in Garwood Valley by river erosion into a buried ice mass. This LGM-aged ice is a remnant of the Ross Ice Sheet that filled Garwood Valley ~10-20 ky ago, damming a paleo-lake that has recently been uncovered. The buried ice mass is preserved beneath a cap of paleo-lake deposits, glacial drift, and permafrost landforms. The superimposed deposits provide a meters-thick record of landscape changes that can be well dated due to the presence of several fossil algal mat and carbonate horizons. The PIs propose to quantify paleo- and modern rates of climate-driven landscape change in Garwood Valley. The PIs also propose to quantify the current rate of buried ice removal from Garwood Valley to generate a geomorphological baseline for documenting landscape change associated with future ice removal. Measurements and modeling of the current ablation of buried ice will quantify present landscape changes in the MDV that are being caused by disequilibrium between climate and the landscape. This proposal will address ambiguity over the timing and extent of valley filling in the southern MDV by LGM ice sheets, and the rates and processes of ice sheet drainage from the valleys.Broader impacts: This project will provide Antarctic field research opportunities for undergraduate students and graduate students. The dramatic melting occurring in Garwood Valley will serve as a vivid example of climate-driven landscape change in Antarctica will be shared with K-12 students and the public at large through live, in-the-field teleconferences mediated by a public school teacher and expert in science outreach. The data that the project will generate will be synthesized into a 3D tour of the field site with expert commentary, suitable for museum display.