Geophysical Investigations of Marie Byrd Land Lithospheric Evolution (GIMBLE)

智力优势：PI建议使用航空地球物理学提供详细的地球物理测绘西南极洲的玛丽伯德地圆顶。他们将使用一台配备先进的探冰雷达、磁力计、航空重力仪和激光高度计的Basler。他们将从三个方面测试玛丽伯德地岩石圈演化模型：1）首次限制玛丽伯德地中部的基岩地形和地壳结构; 2）绘制玛丽伯德地的冰下地貌图，以限制景观演化; 3）绘制冰下火山中心的分布图，并确定活动源。玛丽伯德地是南极洲西部少数几个基岩位于海平面以上的地区之一;因此，它在南极洲西部冰盖（WAIS）的形成和衰减中发挥着关键作用，从而在新近纪期间的海平面变化中发挥作用。几条线的证据表明，玛丽伯德土地的地形已经改变了新生代的过程中，与冰盖的起源和演变的重大影响。更广泛的影响：这项工作将有重要的影响，为冰冻圈和地球动力学社区。这些数据还将利用POLENET项目的成果。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研究员。PI将使用其极地研究网站进行非正式教育，并正式为K-12课程开发做出贡献。这项研究将纳入微博和数据访问，使该项目？的一阶假设在公共场合被证实或否认。

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.