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

0538674/0537752 Matsuoka/Studinger该奖项支持一个项目，以评估现有SOAR探冰雷达数据中的无线电回波强度，这些数据沿着覆盖沃斯托克湖的网格，以及从山脊B到湖的沿着四条区域轨迹。该项目有两个目标;首先，它将检查湖的上表面和反射物，假设它们是流冰和积冰之间的边界。他们将提供有关湖泊动态演变的关键知识。 第二，该项目将研究南极洲东部中部深冰内一个知之甚少的无回声区。该区域可能由变形的停滞冰组成，而其上边界可能是剪切带。 SOAR雷达数据提供了一个独特的资源，以检查时空水循环模式，应该理解，以选择最佳的直接采样策略的湖泊。 东方号的冰芯为这项工作提供了一个独特的机会。首先，将使用冰温度、化学和结构数据在冰芯地点推导出路径效应，即传播损耗和双折射。其次，传播损失的横向变化将通过跟踪与雷达检测到的等渗层相关的化学物质，以及通过从可以复制这些层的冰流模型推断温度来估计。 冰组构模式将从大约100个雷达跟踪交叉点的反射率的各向异性中推断出来。在更广泛的影响方面，将培训一名研究生根据雷达理论和沃斯托克湖的冰川学背景解释雷达数据，并将在西雅图和纽约为K-12教师举办夏季讲习班。该项目将有助于正在进行的东方湖研究工作，并将补充俄罗斯和法国作为国际极地年方案提出的北东方冰芯的选址工作。

0538674/0537752Matsuoka/StudingerThis 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.