P2C2: Extreme Climate Events in the Holocene Controlled by El-Niño-Southern Oscillation (ENSO) Anomalies: Millennia-Long Stalagmite Records from the Southwest Pacific

该项目探索纽埃岛的洞穴遗迹作为西南太平洋地区气候信息档案的用途。这项研究的科学目标是：(1)从全新世的洞穴中获得高分辨率的氧和碳同位素时间序列；(2)结合使用铀/钍测年方法和浮动纹层计数年代学，获得记录的精确绝对年代学；(3)提高对牛儿纪石笋中碳同位素变异性的理解；(4)更好地了解西南地区降水的变异性；和(Vi)通过比较同时期的替代气候记录来评估热带和热带外的联系主要的更广泛的影响包括从稀少抽样区域收集数据，在现代降水和洞穴沉积物之间建立独特的强有力的抽样战略，支持本科生和研究生，以及与纽埃大学的同事和学生建立强有力的国际合作。

This project explores the utility of speleothems from the Island of Niue as archives of climate information from the Southwest Pacific (SWP) region. The scientific objectives of the study are to: (i) acquire high resolution time-series of oxygen and carbon isotopes from speleothems spanning the Holocene; (ii) derive precise absolute chronology of the records based on a combined use of uranium/thorium dating method and floating-lamina counting chronology (iii) improve the understanding of carbon isotope variability in Niuean stalagmites; (iv) better understand rainfall variability in the SWP; and (vi) assess tropical and extra-tropical linkages by comparing contemporaneous proxy climate recordsThe primary broader impacts involve collecting data from a sparsely sampled region, creating a uniquely strong sampling strategy between modern precipitation and cave deposits, supporting undergraduate and graduate students, and building strong international collaboration with colleagues and students from Niue.