Collaborative Research: Iodine in foraminifera as a proxy for ocean deoxygenation during the Paleocene- Eocene Thermal Maximum

合作研究：有孔虫中的碘作为古新世-始新世热最大值期间海洋脱氧的代表

• 批准号: 1232620
• 负责人: Zunli Lu
• 金额: $ 24.86万
• 依托单位: Syracuse University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1232620&HistoricalAwards=false
• 关键词: Collaborative; Research; Iodine; foraminifera; proxy

Oxygen levels in the ocean are expected to decrease as global warming progresses, with potentially serious implications for marine life. To forecast future changes in ocean oxygen levels, a better understanding is needed of deoxygenation associated with past warming events.This project, a collaboration between researchers at Syracuse and Yale Universities, will use iodine in benthic foraminiferal tests as a novel proxy for past oxygenation conditions. The research is motivated by the a close relationship between redox conditions and iodate (IO3-) concentrations in seawater, which affect I/Ca values in foraminiferal tests. The project will expand upon preliminary work in order to better calibrate the iodine proxy, then apply it to a study of the Paleocene-Eocene Thermal Maximum (PETM), a warming event that occurred ~55 million years ago. The researchers will reconstruct temporal, bathymetric, and geographic variations in ocean oxygenation during the PETM, using benthic foraminifera in cores collected by the Ocean Drilling Program from the Atlantic, Pacific, and Indian Ocean basins, as well as land sections from the Mediterranean, eastern U.S., and New Zealand. In addition, they will examine the link between deoxygenation and benthic extinctions, and consider patterns of hypoxia/anoxia to assess which factors (e.g., temperature, productivity, circulation, local methane oxidation) most influenced the development of low oxygen conditions.The researchers will collaborate internationally on proxy refinement with institutions in Germany (GEOMAR) and the UK (Oxford), and will engage policy makers through venues like the Yale Climate and Energy Institute. Funding will support an early-career investigator; additionally, the project will train one PhD, one MS, and two undergraduate students. The project will involve underrepresented high school students through EVOLUTIONS, an NSF-funded after-school program at the Peabody Museum (Yale). Results will be incorporated into university coursework and exhibits targeted at undergraduates.

随着全球变暖的进展，海洋中的氧气水平预计会下降，这可能对海洋生物产生严重影响。为了预测海洋氧气水平的未来变化，需要更好地了解与过去变暖事件相关的脱氧作用。该项目是雪城大学和耶鲁大学研究人员之间的合作项目，将在底栖有孔虫测试中使用碘作为过去氧化条件的新替代物。这项研究的动机是氧化还原条件与海水中碘酸盐 (IO3-) 浓度之间的密切关系，这会影响有孔虫测试中的 I/Ca 值。该项目将扩展前期工作，以便更好地校准碘替代物，然后将其应用于古新世-始新世最热期 (PETM)（发生在约 5500 万年前的变暖事件）的研究。研究人员将利用海洋钻探计划从大西洋、太平洋和印度洋盆地以及地中海、美国东部和新西兰陆地部分收集的岩芯中的底栖有孔虫，重建 PETM 期间海洋氧合的时间、测深和地理变化。此外，他们还将研究脱氧和底栖灭绝之间的联系，并考虑缺氧/缺氧模式，以评估哪些因素（例如温度、生产力、循环、局部甲烷氧化）对低氧条件的发展影响最大。研究人员将与德国（GEOMAR）和英国（牛津）的机构在代理细化方面进行国际合作，并将通过诸如 耶鲁气候与能源研究所。资金将支持早期职业调查员；此外，该项目还将培养一名博士生、一名硕士生和两名本科生。该项目将通过 EVOLUTIONS 吸引代表性不足的高中生，EVOLUTIONS 是一项由 NSF 资助、在皮博迪博物馆（耶鲁大学）开展的课后项目。 结果将纳入大学课程和针对本科生的展览。

项目成果

Paleo-redox context of the Mid-Devonian Appalachian Basin and its relevance to biocrises

• DOI: 10.1016/j.gca.2019.12.019
• 发表时间: 2020-10
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Ruliang He;Wanyi Lu;C. Junium;C. Ver Straeten;Zunli Lu

Late inception of a resiliently oxygenated upper ocean

• DOI: 10.1126/science.aar5372
• 发表时间: 2018-07-13
• 期刊: SCIENCE
• 影响因子: 56.9
• 作者: Lu, Wanyi;Ridgwell, Andy;Lu, Zunli
• 通讯作者: Lu, Zunli

I/Ca in epifaunal benthic foraminifera: A semi-quantitative proxy for bottom water oxygen in a multi-proxy compilation for glacial ocean deoxygenation

表层底栖有孔虫中的 I/Ca：冰川海洋脱氧多代理汇编中底层水氧的半定量代理

• DOI: 10.1016/j.epsl.2019.116055
• 发表时间: 2020
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Lu, Wanyi;Rickaby, Rosalind E.M.;Hoogakker, Babette A.A.;Rathburn, Anthony E.;Burkett, Ashley M.;Dickson, Alexander J.;Martínez-Méndez, Gema;Hillenbrand, Claus-Dieter;Zhou, Xiaoli;Thomas, Ellen
• 通讯作者: Thomas, Ellen