EAR-PF: High-resolution boron isotope variation in marine carbonate fossils: Insights on the timing and mechanisms of Ordovician climate change.

EAR-PF：海洋碳酸盐化石中的高分辨率硼同位素变化：对奥陶纪气候变化的时间和机制的见解。

• 批准号: 1049619
• 负责人: Cara Thompson
• 金额: $ 8.5万
• 依托单位: Thompson Cara K
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-05-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1049619&HistoricalAwards=false
• 关键词: EAR; PF; resolution; boron; isotope

Dr. Cara K. Thompson has been granted an NSF Earth Sciences Postdoctoral Fellowship to carry out a research and education plan at the State University of New York, Stony Brook. In this study, high-resolution chemostratigraphy of Ordovician marine carbonate platform rocks will be used to understand the ties between climate, perturbations in the marine carbon isotope record and ocean/atmosphere pCO2. The timing and mechanisms behind of the onset of Late Ordovician glaciation are poorly understood, but generally tied to the appearance of large excursions in the marine carbon isotope record. The C-isotope record of the transition between greenhouse climate in the Early to Middle Ordovician to glaciation in the Late Ordovician indicates changes in CO2 drawdown that conflict with sea surface temperature records. These discrepancies highlight the need for a robust proxy for pCO2. The results of this study will represent the earliest record of boron-isotope composition and act as a test for the utility of boron isotope as a proxy for ocean pCO2 in the Paleozoic. Global climate change is a topic high interest in recent decades. Looking to the past record of pCO2 and global climate is essential to predicting the impact of modern changes in atmospheric carbon dioxide concentration on the biosphere. In this study, the boron isotope record, a proxy for marine pCO2, will be extended to early in Earth's history. The Ordovician represents a time of extreme climate change and an interval in which evidence in the fossil record suggests the most rapid biodiversification followed by one of the largest extinction events in Earth's history. This study will provide ample opportunity to engage high school and undergraduate students in active research. Along with students in the Masters of Arts and Teaching program, the PI will incorporate high school students into field exercises, sample processing, and data interpretation. The PI will teach undergraduate and graduate level courses in geochemical records with emphasis on marine carbon, sulfur and oxygen in Earth's history.

卡拉·K博士汤普森已被授予美国国家科学基金会地球科学博士后奖学金，在斯托尼布鲁克的纽约州立大学开展研究和教育计划。 在这项研究中，奥陶纪海洋碳酸盐台地岩石的高分辨率化学地层学将被用来了解气候，海洋碳同位素记录和海洋/大气pCO 2扰动之间的联系。 晚奥陶世冰期开始的时间和机制知之甚少，但通常与海洋碳同位素记录中出现的大幅度漂移有关。 早中奥陶世温室气候到晚奥陶世冰川作用之间的过渡的碳同位素记录表明，CO2下降的变化与海表温度记录相冲突。 这些差异突出表明需要一个强大的pCO 2代理。 这项研究的结果将代表硼同位素组成的最早记录，并作为一个测试的效用硼同位素作为一个代理在古生代海洋pCO 2。全球气候变化是近几十年来备受关注的话题. 查看pCO 2和全球气候的过去记录对于预测大气二氧化碳浓度的现代变化对生物圈的影响至关重要。 在这项研究中，硼同位素记录，海洋pCO 2的代理，将延长到地球历史的早期。 奥陶纪是一个极端气候变化的时期，在这个时期，化石记录中的证据表明生物多样性最迅速，随后是地球历史上最大的灭绝事件之一。 这项研究将提供充分的机会，从事高中和本科学生积极的研究。 沿着艺术与教学硕士课程的学生，PI将把高中学生纳入实地练习，样品处理和数据解释。 PI将教授地球化学记录的本科生和研究生课程，重点是地球历史中的海洋碳，硫和氧。