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.

知识分子的优点：最近，一个广阔的地层柱子被河流侵蚀在加伍德山谷中暴露在一个被埋的冰块中。这款LGM时代的冰是Ross冰盖的残余物，该冰盖填充了Garwood Valley 〜10-20 Ky，该ky曾在最近被发现的古湖上挖掘。埋入的冰块被保存在古湖沉积物，冰川漂移和多年冻土地面的帽子下。叠加的沉积物提供了景观变化的米厚记录，由于存在几种化石藻类垫和碳酸盐范围，因此可以很好地约会。 PI提议量化加伍德山谷气候驱动的景观变化的古和现代速度。 PIS还建议量化当前从加伍德谷（Garwood Valley）清除冰冰的速率，以产生一种地貌基线，以记录与未来冰的相关的景观变化。当前埋入冰的当前消融的测量和建模将量化由气候和景观之间不平衡引起的MDV中当前的景观变化。该提案将解决LGM冰盖在南部MDV的山谷填充的时间和程度上的歧义，以及山谷中的冰盖排水的速度和过程。Boader的影响：该项目将为本科生和研究生提供南极现场研究机会。在加伍德山谷发生的戏剧性融化将成为南极气候驱动景观变化的生动典范，将与K-12学生和大众通过现场直播，现场电视教师和科学外展专家介导的广泛的公众。该项目将生成的数据将通过专家评论（适合博物馆展示）合成到现场网站的3D巡回演出中。