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。麦肯齐博士试图解决陆地(陆上)和海洋(近海)冰川记录之间的关系。大约20,000年前，当科迪勒冰盖覆盖北美西部时，控制它的因素还没有被很好地了解。利用陆上和近海冰川记录，该项目将随着时间的推移提高对太平洋和独联体动态的理解。这项工作还试图洞察影响冰盖对海平面上升的贡献的因素，这最终将有助于限制现代系统中的冰对未来海平面上升的影响。奖学金的资助为本科生创造了进行研究的机会。此外，该项目还将支持为大学和阿拉斯加原住民科学与工程项目学生开发教材。科迪勒冰盖(独联体)海缘过去50 000年的消冰史受到的限制很少，尽管这一记录可能有助于查明冰流稳定性的控制、阐明千年和全球规模的气候振荡以及描述太平洋的古洋流动态。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领域的技术来限制夏洛特女王湾附近残留冰流的时空消退动力学。主要是，研究人员将用冰山漂浮碎片(IRD)和深海钻探项目(DSDP)CRUS18第177站点的近海海洋沉积物年代学补充激光雷达冰川地貌测绘和测深高程数据，以限制过去50,000年来独联体西南部冰流活动的位置、行为、时间和速率。将陆上和近海数据配对将产生强有力的古冰川时间和空间记录，并对整个独联体模型、太平洋的海洋动力学和千年尺度的气候振荡产生影响，以支持对地球气候系统中的动态、速率和变化幅度的理解。这项工作中使用的多学科技术将提高对冰流控制的理解，适合预测未来冰川流失的动态，最终阐明陆上和近海记录之间的关系。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

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.