Doctoral Dissertation Research: Towards Developing a Chronology of Late-Pleistocene Climate Change, Western U.S.: Establishing Production Rates of Cosmogenic Nuclides

俄勒冈州立大学利恰尔迪，约瑟夫·M·俄勒冈州立大学。高于轨道频率的显著气候变化现在被认为是环北大西洋地区晚更新世冰和沉积物记录中的一个重要信号。其他地方的记录还揭示了千年时间尺度上的气候变异性，并确定了重要但鲜为人知的气候变化机制。这个博士论文项目将研究美国西部晚更新世冰川的记录。更好地记录和识别与之相关的气候信号的机制是目标，将导致对该地区气候变化的空间和时间范围的更全面的了解。其目的是使用新开发的表面暴露方法来改进山脉冰川的数值年表，并将这些方法应用于美国西部山脉的许多冰川冰川。主要目标是从放射性碳测年流动中确定宇宙成因核素的产生率。研究结果将为我们理解从一条山脉到另一条山脉的地层复杂性提供新的线索。它还将有助于揭示该地区过去5万年来的气候变化。

Licciardi, Joseph M Oregon State University Significant climate variability at higher-than-orbital frequencies is now recognized as an important signal in late Pleistocene ice and sediment records from the circum-North Atlantic region. Records elsewhere also reveal climate variability at millennial timescales and identify important but poorly understood mechanisms of climate change. This doctoral dissertation project will examine the record of late-Pleistocene glaciers in the western U.S. Better dating of the record and identification of the mechanisms of its associated climate signal are objectives which will lead to a fuller understanding of the spatial and temporal ranges of climate change in this region. The intent is to develop an improved numerical chronology of mountain glaciation using newly developed surface exposure methods and apply these to numerous glacial moraines in mountain ranges of the western U.S. The primary objective is to establish production rates of cosmogenic nuclides from radiocarbon-dated flows. Results of the research will shed new light on our understanding of stratigraphic complexity from one mountain range to another. It will also serve to reveal the variation in climate in this region over the past 50,000 years.