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

博士后奖学金：EAR-PF：将古冰流的陆上和海上观测配对，以限制和阐明科迪勒拉冰盖 (PISCES) 的动态

• 批准号: 2305317
• 负责人: Marion McKenzie
• 金额: $ 18万
• 依托单位: McKenzie, Marion
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2305317&HistoricalAwards=false
• 关键词: Postdoctoral; Fellowship; EAR; PF; Pairing

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.

Marion McKenzie博士被授予NSF地球科学博士后研究金，以在Ryan Venturelli博士的指导下在科罗拉多州矿业的研究和专业发展活动中进行研究和专业发展活动。麦肯齐（McKenzie）博士试图解决陆地（陆上）与海洋（海上）冰川记录之间的关系。当大约20，000年前覆盖北美西部时，控制山脉冰盖（CIS）的因素尚不清楚。使用陆上和海上冰川记录，该项目将随着时间的流逝而提高对太平洋和CIS动态的理解。这项工作还旨在洞悉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块如何在未来有助于海平面上升。奖学金为本科生提供了研究机会。此外，该项目将支持为大学级别和阿拉斯加本地科学与工程计划的学生开发教育材料。在过去的50，000年中，山脉冰盖（CIS）海洋边缘的脱冰历史受到了限制，尽管该记录可能有可能有助于确定对冰流稳定性的控制，阐明千禧一代和全球规模的气候振荡，并阐明了整个太平洋海洋的古流动动力学。拟议的项目将利用沉积学，地年学，地球物理学和冰川学领域的技术来限制夏洛特女王声音附近的遗物冰流的时空静修动力学。 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.配对在沿岸数据将导致古质量的时间和空间记录与对整体CIS建模，太平洋中的海洋动力学以及千禧一代气候振荡的影响，以增强对地球气候气候变化的动态，速率和幅度的了解。整个工作中使用的多学科技术将提高人们对冰流的控制的理解，适合于预测未来的冰丢失动态，以最终阐明陆上和近海记录之间的关系。这项奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力和更广泛影响的评估来进行评估的支持，这是值得的。