Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE)

知识价值：pi建议使用航空地球物理学来提供南极洲西部玛丽伯德地圆顶的详细地球物理测绘。他们将使用配备先进的破冰雷达、磁力计、机载重力仪和激光高度计的Basler。他们将以三种方式测试玛丽伯德地岩石圈演化模型：1)首次约束玛丽伯德地中部的基岩地形和地壳结构；2)绘制Marie Byrd Land的冰下地貌，约束景观演化；3)绘制冰下火山中心分布图，识别活源。玛丽伯德地是西南极洲少数几个基岩高于海平面的地区之一；因此，它在西南极冰盖（WAIS）的形成和衰变中起着关键作用，从而在新近纪期间海平面的上升变化中起着关键作用。几条线索的证据表明，玛丽伯德地的地形在新生代的过程中发生了变化，这对冰盖的起源和演化具有重要意义。更广泛的影响：这项工作将对冰冻圈和地球动力群落产生重要影响。这些数据还将利用来自POLENET项目的结果。pi将培训研究生和本科生解释大型地球物理数据集，为他们提供共同撰写同行评审论文的机会，并向更广泛的科学界展示他们的工作。这项研究还将支持一名年轻的女性研究员。pi将使用他们的极地研究网站进行非正式教育，并为K-12课程开发做出正式贡献。该研究将结合微博和数据访问，以允许项目？S一阶假设被公开证实或否认。

Intellectual Merit: The PIs propose to use airborne geophysics to provide detailed geophysical mapping over the Marie Byrd Land dome of West Antarctica. They will use a Basler equipped with advanced ice penetrating radar, a magnetometer, an airborne gravimeter and laser altimeter. They will test models of Marie Byrd Land lithospheric evolution in three ways: 1) constrain bedrock topography and crustal structure of central Marie Byrd Land for the first time; 2) map subglacial geomorphology of Marie Byrd Land to constrain landscape evolution; and 3) map the distribution of subglacial volcanic centers and identify active sources. Marie Byrd Land is one of the few parts of West Antarctica whose bedrock lies above sea level; as such, it has a key role to play in the formation and decay of the West Antarctic Ice Sheet (WAIS), and thus on eustatic sea level change during the Neogene. Several lines of evidence suggest that the topography of Marie Byrd Land has changed over the course of the Cenozoic, with significant implications for the origin and evolution of the ice sheet.Broader impacts: This work will have important implications for both the cryospheric and geodynamic communities. These data will also leverage results from the POLENET project. The PIs will train both graduate and undergraduate students in the interpretation of large geophysical datasets providing them with the opportunity to co-author peer-reviewed papers and present their work to the broader science community. This research will also support a young female researcher. The PIs will conduct informal education using their Polar Studies website and contribute formally to K-12 curriculum development. The research will incorporate microblogging and data access to allow the project?s first-order hypothesis to be confirmed or denied in public.