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

加伍德山谷的快速景观变化：监测埋藏冰川融化并探索皮威失落的湖

• 批准号: 1043785
• 负责人: Joseph Levy
• 金额: $ 34.58万
• 依托单位: Portland State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-15 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1043785&HistoricalAwards=false
• 关键词: Rapid; Landscape; Change; Garwood; Valley

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.

智力优势：由于河流侵蚀成埋藏的冰块，加伍德谷最近出现了一个广阔的地层柱。这种LGM时代的冰是罗斯冰盖的残余物，大约10-20年前，罗斯冰盖充满了加伍德谷，并堵塞了一个最近被发现的古湖。埋藏的冰块保存在古湖泊沉积物、冰川漂移和永久冻土地貌的覆盖层之下。叠加的沉积物提供了数米厚的景观变化记录，由于存在一些化石藻垫和碳酸盐层，可以很好地确定年代。 PI 建议量化加伍德谷气候驱动的景观变化的古和现代速率。 PI 还建议量化当前加伍德谷埋冰清除率，以生成地貌基线，用于记录与未来除冰相关的景观变化。对当前埋冰消融的测量和建模将量化目前由气候和景观之间不平衡引起的 MDV 景观变化。该提案将解决有关末次冰原冰盖填充 MDV 南部山谷的时间和范围以及冰盖从山谷排水的速率和过程的模糊性问题。 更广泛的影响：该项目将为本科生和学生提供南极实地研究机会研究生。加伍德谷发生的急剧融化将成为气候驱动的南极洲地貌变化的生动例子，将通过由公立学校教师主持的现场电话会议与 K-12 学生和广大公众分享科学推广专家。该项目生成的数据将被合成为带有专家评论的现场 3D 游览，适合博物馆展示。