Combined 230Th and 231Pa Dating: Establishing the Absolute Timing of late Quaternary Climate Changes and Calibrating the 14 C Timescale

该奖项将支持一个研究小组解决三个独立的项目，每个项目都将使用放射性化学定年技术（14C， 230Th和231Pa）与珊瑚和洞穴的稳定同位素和微量元素分析相结合。项目包括：(1)利用先前从巴布亚新几内亚收集的珊瑚和巴哈马群岛的洞穴标本，对距今1万年至4.8万年的放射性碳时间尺度进行校准；(2)建立北美中部大陆密苏里地区高分辨率气候记录；(3)利用巴巴多斯的珊瑚露头确定第二次冰消期（终止II）的年龄和海平面历史。

The ESH award will support a team of investigators to address three separate projects, each combining the use of radiochemical datinge techniques (14C, 230Th and 231Pa) with stable isotope and trace element analysis of corals and speleothems. Projects include: (1) Calibration of the radiocarbon time scale between 10,000 and 48,000 years BP using previously-collected corals from Papua New Guinea and speleothems from the Bahamas; (2) Establish a high-resolution climate record for the mid-continent of North America from Missouri speleothems; (3) Determine the age and sea-level history for the penultimate deglaciation (Termination II) using coral outcrops in Barbados.