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

智力上的优点：由于河流侵蚀成一个埋藏的冰块，一个膨胀的地层柱最近在加伍德山谷暴露出来。这个LGM年龄的冰是罗斯冰盖的残余，大约10-20千年前填满了加伍德山谷，阻塞了一个最近被发现的古湖。埋藏的冰块被保存在古湖泊沉积物、冰川漂流物和永久冻土地貌的盖层之下。叠加的沉积物提供了一个米厚的景观变化记录，可以很好地确定日期，由于存在几个化石藻垫和碳酸盐层。PI建议量化Garwood Valley气候驱动的景观变化的古速度和现代速度。PI还建议量化当前从Garwood Valley移除掩埋冰的速率，以生成地貌基线，用于记录与未来冰移除相关的景观变化。测量和模拟目前消融的埋冰将量化目前的景观变化的MDV是由气候和景观之间的不平衡。这个建议将解决模糊的时间和范围内的山谷填充在南部MDV由LGM冰盖，冰盖排水的速度和过程从valleys.Broader影响：这个项目将提供南极实地研究的机会，本科生和研究生。发生在加伍德山谷的戏剧性融化将作为气候驱动的南极洲景观变化的生动例子，将通过现场直播与K-12学生和广大公众分享，现场由公立学校教师和科学推广专家主持的电话会议。该项目将产生的数据将被合成为一个现场的3D旅游与专家评论，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.