Postdoctoral Fellowship: EAR-PF: Pairing on-and-offshore observations of paleo-ice streams to constrain and elucidate dynamics of the Cordilleran Ice Sheet (PISCES)

Marion McKenzie博士已被授予NSF地球科学博士后奖学金，在Ryan Venturelli博士的指导下在科罗拉多矿业学院开展研究和专业发展活动。McKenzie博士试图解决陆地（陆上）和海洋（海上）冰川记录之间的关系。大约20，000年前，当科迪勒纳冰盖（CIS）覆盖北美西部时，控制它的因素还没有得到很好的理解。利用陆上和海上的冰川记录，该项目将增进对太平洋和独联体随时间变化的动态的了解。这项工作还试图深入了解影响冰盖对海平面上升的贡献的因素，这将最终有助于限制现代系统中的冰如何可能导致未来海平面上升。奖学金为本科生进行研究创造了机会。此外，该项目还将支持为大学和阿拉斯加土著科学工程项目学生编写教材。在过去的50，000年里，科迪勒拉冰盖（CIS）海洋边缘的冰川消退历史受到很大的限制，尽管这一记录可能有助于确定对冰流稳定性的控制，阐明千年和全球尺度的气候振荡，并表征整个太平洋的古水流动力学。拟议的项目将利用沉积学、地质年代学、地球物理学和冰川学等领域的技术来限制夏洛特女王湾附近残留冰流的时空退缩动态。主要是，研究人员将补充从LiDAR和水深高程数据的冰川地貌地形图与冰山漂流碎片（IRD）和近海海洋沉积物地质年代学从深海钻探项目（DSDP）巡航18，站点177限制位置，行为，时间和独联体西南部冰流活动的速度在过去的50，000年。配对和近海数据将导致强大的时间和空间记录的古冰川与整体独联体建模，在太平洋的海洋动力学和千年尺度的气候振荡的影响，以加强对动力学的理解，速率和地球气候系统的变化幅度。在这项工作中使用的多学科技术将提高对冰流控制的理解，适用于预测未来冰损失的动态，最终阐明陆上和海上记录之间的关系。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

Dr. Marion McKenzie has been awarded an NSF Earth Sciences Postdoctoral fellowship to carry out research and professional development activities at Colorado School of Mines under the mentorship of Dr. Ryan Venturelli. Dr. McKenzie seeks to resolve relationships between terrestrial (onshore) and marine (offshore) records of glaciation. The factors that controlled the Cordilleran Ice Sheet (CIS) when it covered western North America about 20,000 years ago are not well understood. Using onshore and offshore records of glaciation, this project will improve understanding of Pacific Ocean and CIS dynamics through time. This work also seeks to provide insight into the factors that influence ice sheet contributions to sea level rise, which will ultimately help in constraining how ice in modern systems may contribute to sea level rise in the future. The fellowship funding creates opportunities for undergraduate students to conduct research. In addition, this project will support development of educational materials for college-level and Alaska Native Science & Engineering Program students. The deglacial history of Cordilleran Ice Sheet (CIS) marine margins over the last 50,000 years is poorly constrained despite the potential insights this record may contribute to identifying controls on ice stream stability, elucidating millennial and global-scale climate oscillations, and characterizing paleo-current dynamics across the Pacific Ocean. The proposed project will leverage techniques from the fields of sedimentology, geochronology, geophysics, and glaciology to constrain the spatiotemporal retreat dynamics of relict ice streams near the Queen Charlotte Sound. Principally, the researchers will supplement mapping of glacial geomorphic landforms from LiDAR and bathymetric elevation data with iceberg-rafted debris (IRD) and offshore marine sediment geochronology from Deep Sea Drilling Project (DSDP) cruise 18, site 177 to constrain the location, behavior, timing, and rate of southwestern CIS ice stream activity over the last 50,000 years. Pairing on-and-offshore data will lead to strong temporal and spatial records of paleo-glaciation with implications for overall CIS modelling, ocean dynamics in the Pacific Ocean, and millennial-scale climate oscillations to bolster understanding of dynamics, rates, and magnitude of change in the Earth climate system. Multidisciplinary techniques used throughout this work will improve understanding of controls on ice streams suitable for predicting dynamics of future ice loss to ultimately elucidate the relationship between onshore and offshore records.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.