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

智力价值：加伍德山谷最近因河流侵蚀而暴露出一个广阔的地层柱，变成了一个埋藏的冰块。这个LGM时代的冰是大约10-20年前填满加伍德山谷的罗斯冰盖的残余物，它筑坝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、冰川漂流和永久冻土地貌的盖子下。叠加的沉积物提供了一张几米厚的地貌变化记录，由于存在几个化石藻垫和碳酸盐地层，可以很好地确定年代。PIs建议量化加伍德山谷气候驱动的古和现代景观变化速度。私营机构亦建议量化加伍德河谷目前的地冰清除速度，以产生一个地貌基准，以记录与未来除冰有关的地貌变化。对当前埋藏的冰的消融进行测量和建模，将量化由于气候和地貌之间的不平衡而导致的MDV中目前的地貌变化。这项提议将解决冰盖冰盖在南部MDV填充山谷的时间和程度以及冰盖从山谷中排出的速度和过程的含糊不清问题。更广泛的影响：该项目将为本科生和研究生提供南极实地研究机会。加伍德山谷发生的戏剧性融化将成为南极洲气候驱动的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调解的现场电话会议，与K-12学生和广大公众分享。该项目将产生的数据将被合成成带专家解说的现场3D巡视，适合在博物馆展出。

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.