Collaborative Research: Deciphering the Deep Ice and the Ice-water Interface over Lake Vostok Using Existing Radar Data

合作研究：利用现有雷达数据破译沃斯托克湖上的深冰和冰水界面

• 批准号: 0538674
• 负责人: Dale Winebrenner
• 金额: --
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538674&HistoricalAwards=false
• 关键词: Collaborative; Research; Deciphering; Deep; Ice

0538674MatsuokaThis award supports a project to evaluate radio-echo intensities in the available SOAR ice-penetrating radar data along grids covering Lake Vostok, and along four regional tracks from Ridge B toward the lake. The project has two objectives; first, it will examine the upper surface of the lake and reflectors hypothesized to be a boundary between the meteoric and accreted ice. They will provide crucial knowledge on the dynamic evolution of the lake. Second, this project will examine a poorly understood echo-free zone within the deep ice in central East Antarctica. This zone may consist of distorted stagnant ice, while its upper boundary may be a shear zone. The SOAR radar data provide a unique resource to examine spatiotemporal water circulation patterns that should be understood in order to select the best direct-sampling strategy to the lake. The Vostok ice core provides a unique opportunity to do this work. First, the path effects, i.e. propagation loss and birefringence, will be derived at the ice-core site using ice temperature, chemistry, and fabric data. Second, lateral variations of the propagation loss will be estimated by tracking chemistry associated with radar-detected isochronous layers, and by inferring temperatures from an ice-flow model that can replicate those layers. Ice-fabric patterns will be inferred from anisotropy in the reflectivity at about 100 radar-track cross-over sites. In terms of broader impacts, a graduate student will be trained to interpret the radar data in the light of radar theory and glaciological context of Lake Vostok and summer workshops for K-12 teachers will be provided in Seattle and New York. This project will contribute to ongoing efforts to study Lake Vostok and will complement the site selection for a North Vostok ice core, which has been proposed by Russia and France as an IPY program.

0538674Matsuokathis奖支持一个项目，该项目沿着覆盖Vostok湖的网格的可用飞升冰冰期雷达数据评估无线电回声强度，并沿着从Ridge B到湖的四个区域轨道。该项目有两个目标。首先，它将检查湖泊的上表面，并假设是陨石和吸收冰之间的边界。他们将提供有关湖泊动态演变的关键知识。 其次，该项目将检查南极洲中部深层冰区域内的一个知之甚少的无回声区域。该区域可能由扭曲的停滞冰组成，而其上边界可能是剪切区。 SOAR雷达数据提供了一种独特的资源来检查时空水循环模式，以便为湖泊选择最佳的直接采样策略。 Vostok Ice Core为完成这项工作提供了独特的机会。首先，路径效应，即传播损失和双折射，将使用冰温，化学和织物数据在冰核部位得出。其次，通过跟踪与雷达检测的等方层相关的化学和从冰流模型中推断温度的横向变化将估计，从而可以复制这些层。 在大约100个雷达轨道交叉部位的反射率中，将从各向异性中推断出冰模式。在更广泛的影响方面，将在西雅图和纽约为K-12教师提供雷达理论和夏季讲习班的雷达理论和夏季讲习班的培训，以解释雷达数据。该项目将有助于研究沃斯托克湖的持续努力，并将补充北沃斯托克冰核心的现场选择，俄罗斯和法国作为IPY计划提出。