Geometry and dynamics of subglacial lakes in East Antarctica

东南极洲冰下湖泊的几何形状和动力学

• 批准号: 76388237
• 负责人: Professor Dr.-Ing. Reinhard Dietrich
• 金额: --
• 依托单位: Polar Marine Geosurvey Expedition
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/76388237?language=en
• 关键词: Geometry; dynamics; subglacial; lakes; East

The proposed bilateral cooperation project between TU Dresden and PMGE aims at a complex, interdisciplinary investigation of subglacial lakes in East Antarctica. The study of subglacial water cavities and water discharges constitutes one of the major targets of current international research in Antarctica. Many phenomena related to the existence of subglacial water cavities are still poorly understood. Basal water layers and their interaction with the overlaying ice, however, have important implications for the dynamics, mass balance and stability of the Antarctic ice sheet. Based on the experience gathered by both partners jointly in the investigation of the world's largest known subglacial Lake Vostok, a number of smaller subglacial water cavities discovered in the sector Mirny - Vostok - Progress shall be studied using both in-situ observations and satellite data. Combining geophysical and geodetic measurements, the grounding line of subglacial water cavities will be detected and surface heights and their changes, the horizontal flow velocity field, and the thickness of the covering ice sheet will be determined. From that, the morphometry of the subglacial water cavities, their water budget, water exchange processes, the interactions between water and ice sheet, ice flow dynamics, mass balance estimates and the geomorphologic environment of the subglacial lakes are deduced and interpreted. At this, the anticipated quality and complexity of the results can be achieved only by combining the experience, the complementary techniques, methods and data of both partners.

德累斯顿工业大学和PMGE之间拟议的双边合作项目旨在对南极洲东部的冰下湖泊进行复杂的跨学科调查。对冰下水洞和水排放的研究是目前国际上在南极洲进行研究的主要目标之一。许多与冰下水洞存在有关的现象仍然知之甚少。然而，底层水及其与上覆冰的相互作用对南极冰盖的动力学、质量平衡和稳定性具有重要影响。根据双方合作伙伴在世界上已知最大的冰下沃斯托克湖调查中共同收集的经验，应利用现场观测和卫星数据对米尔尼-沃斯托克-进步区发现的许多较小的冰下水腔进行研究。将结合地球物理和大地测量，探测冰下水洞的接地线，并确定表面高度及其变化、水平流速场和覆盖冰盖的厚度。由此，冰下水腔的形态，它们的水收支，水交换过程，水和冰盖之间的相互作用，冰流动力学，质量平衡估计和冰下湖泊的地貌环境的推导和解释。在这方面，只有结合两个伙伴的经验、互补技术、方法和数据，才能实现预期的成果质量和复杂性。