Barbados Sea Level and Radiocarbon Calibration Records

巴巴多斯海平面和放射性碳校准记录

• 批准号: 0928446
• 负责人: Richard Fairbanks
• 金额: $ 49.75万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0928446&HistoricalAwards=false
• 关键词: Barbados; Sea; Level; Radiocarbon; Calibration

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-2).The island of Barbados provides an excellent approximation of the global sea level history. Uranium series and radiocarbon dating of fossil corals from wire line drill cores have already provided a sea level record for the deglacial and an expanded record has extended the sea level history to 30,000 years BP. During a 2007 cruise the PI drilled submerged Late Pleistocene coral reefs southwest of South Point Barbados. A majority of these samples are represented by the reef crest species Acropora palmata and U-series dating of selected Acropora palmata samples indicate corals range in the age from 11 to 33 kyr. The PIs will conduct U-series and AMS 14C datings on ~ 200 Acropora palmata samples from the new collection and use the data to construct a sea-level curve directly using this surface dwelling coral. This will provide a detailed sea level and radiocarbon record for the last 33 kyr. The PIs will be able to better resolve the timing and extent of melt water pulses, constrain the duration of the Last Glacial Maximum low-stand through Heinrich event 1, and better resolve sea level variations during the Younger Dryas and LGM, with particular interest in determining the rate of sea level fall (60m) between 33 and 26 ky. Broader impacts: The study will provide the scientific community with a continuous sea level record of the last 33 ky as well as calibrate the radiocarbon curve for that interval. The project will also provide material for a PhD dissertation and support two undergraduates.

该奖项是根据2009年美国复苏和再投资法案（公法111-2）资助的。巴巴多斯岛提供了全球海平面历史的极好近似。铀系和放射性碳测年法对钢丝绳钻芯中的珊瑚化石进行了测年，已经提供了冰消期的海平面记录，而一个扩大的记录将海平面历史延长到了距今30，000年。 在2007年的一次巡航中，PI在巴巴多斯南角西南部钻探了淹没在水下的晚更新世珊瑚礁。这些样本中的大多数是由珊瑚礁冠物种Acropora palmata和选定的Acropora palmata样本的U系列测年表明珊瑚的年龄范围从11到33 kyr。 PI将对新采集的约200个Acropora palmata样本进行U系列和AMS 14 C测年，并使用这些数据直接使用这种表面居住珊瑚构建海平面曲线。这将提供过去33 kyr的详细海平面和放射性碳记录。PI将能够更好地解决融水脉冲的时间和范围，通过Heinrich事件1限制末次冰期最大低水位的持续时间，并更好地解决新仙女木和LGM期间的海平面变化，特别是在确定33和26 ky之间的海平面下降率（60米）方面。更广泛的影响：这项研究将为科学界提供过去33千年的连续海平面记录，并校准该期间的放射性碳曲线。该项目还将为博士论文提供材料，并支持两名本科生。