Collaborative Research: Using Ca, Sr, Mg, and Fe isotope proxies to constrain redox and continental weathering during Ocean Anoxic Event 2

合作研究：使用 Ca、Sr、Mg 和 Fe 同位素代理来抑制海洋缺氧事件 2 期间的氧化还原和大陆风化

基本信息

批准号：
1933302
负责人：
Alan Brandon
金额：
$ 21.24万
依托单位：
University of Houston
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-06-01 至 2022-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933302&HistoricalAwards=false
关键词：
Collaborative Research Using Ca Sr

项目摘要

Rapid increases of carbon dioxide in the atmosphere can lead to changes in the global ocean, including increased acidification, lower oxygen, and significantly reduced plant and animal life. This project’s scientists are interested in changes in ocean chemistry and global climate 94 million years ago when the atmosphere had up to 5 times more carbon dioxide than Earth’s present atmosphere, and the concentrations varied dramatically. The researchers are measuring isotopes of strontium, calcium, magnesium, and iron in rocks from the Eagle Ford Group in Texas that formed from an ancient seabed. The results are leading to a better understanding of the factors that led to and sustained that period of global warming, and they are revealing implications for present-day climate change. This research is aiding the career development of a Ph.D. student from an underrepresented group and an early career female scientist. A museum exhibit on climate and energy is being created to outreach to the public about this work.The Late Cretaceous Ocean Anoxic Event 2 (OAE2) was a sustained period of high atmospheric carbon dioxide and consequent warming of the global climate. How global warming is related to volcanic activity, and the cascading effects on continental weathering and global ocean chemistry, remain open questions. A complete stratigraphic section through OAE2 from the Eagle Ford Group in Texas is being examined for Sr, Ca, Mg, and Fe isotopes. Each of these element systems record distinct chemical information on the global ocean environment and on changing climate. Numerical mass balance models based on the isotope data are being employed to constrain the inputs and outputs to the global ocean and the feedback between volcanic activity and continental weathering. Results are providing a framework for further examination of the causes of ocean anoxia and substantial climate change in the geological past, and are allowing a better understanding of the factors contributing to future climate change. Broader impacts of this project include mentoring and training students from underrepresented groups and public outreach about the links between climate and energy.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

大气中二氧化碳的快速增加可能导致全球海洋的变化，包括增加酸化，氧气下降，并显着降低动植物的寿命。该项目的科学家对9400万年前的海洋化学和全球气候变化感兴趣，当时大气的二氧化碳比地球当前的大气含量高出5倍，而且浓度却大大不同。研究人员正在测量得克萨斯州鹰福特集团的岩石中锶，钙，镁和铁的同位素，这些岩石是由古老的海床形成的。结果使得更好地理解导致和维持全球变暖时期的因素，并且它们揭示了对当今气候变化的影响。这项研究有助于博士学位的职业发展。来自代表性不足的小组和早期职业女科学家的学生。正在创建有关气候和能源的博物馆展览，以向公众推广这项工作。晚白垩纪海洋缺氧事件2（OAE2）是持续的高大气二氧化碳，并导致全球气候变暖。全球变暖与火山活动以及对大陆风化和全球海洋化学的级联影响如何相关。正在检查得克萨斯州Eagle Ford Group的OAE2的完整地层部分，正在检查SR，CA，MG和FE同位素。这些元素系统中的每一个都记录了有关全球海洋环境和气候变化的不同化学信息。基于同位素数据的数值质量平衡模型正在用于将输入和输出限制为全球海洋以及火山活动与连续风化之间的反馈。结果提供了一个框架，以进一步研究地质过去的海洋缺氧原因和严重的气候变化，并可以更好地了解导致未来气候变化的因素。该项目的更广泛影响包括来自代表性不足的团体的心理和培训学生以及有关气候与能源之间联系的公众推广。该奖项反映了NSF的法定任务，并通过使用基金会的智力优点和更广泛的影响评估标准来通过评估来表示赞成支持。