OCE-PRF: Development and Application of the Foraminiferal Iodine/Calcium Paleoredox Proxy
OCE-PRF:有孔虫碘/钙古氧化还原代理的开发和应用
基本信息
- 批准号:2126568
- 负责人:
- 金额:$ 30.47万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-01-01 至 2024-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Development and Application of the Foraminiferal I/Ca Paleoredox Proxy The amount of dissolved oxygen in seawater varies and is linked to the distribution of life in the oceans. Expansion of marine oxygen deficient zones (ODZs), where oxygen reaches levels low enough to limit habitability, are an expected result of climate change. As we work to predict how this will affect future oceans, studying marine oxygenation over past climate change events is increasingly valuable. The Miocene Climatic Optimum (MCO), which occurred ~15-17 million years ago, is such an event, during which the Earth’s temperature warmed up to 3C on average and atmospheric carbon dioxide levels rose to an estimated 400-500ppm. Multiple lines of evidence suggest that severe ODZs around the globe intensified during the MCO, but direct evidence is lacking. We will use experiments to validate and apply the foraminiferal iodine-to-calcium (I/Ca) proxy—which uses the iodine content of microscopic fossils to estimate marine oxygen concentrations—to sediments from the MCO in the Eastern Tropical Pacific to study the intensity of low oxygen in the region during the MCO and improve predictions of ODZ changes in future climate change scenarios. This project combines laboratory experiments, field work, and analytical procedures that will incorporate International Ocean Discovery Program archives as well as training and research experiences for graduate and undergraduate students (including specific plans for mentoring Latinx undergraduate STEM majors). This effort consists of three discrete but interrelated projects to test, ground-truth, and apply the foraminiferal I/Ca proxy. The foraminifera I/Ca proxy is a method for reconstructing oxygen concentrations in ancient oceans based on the iodine concentrations of microscopic shells of protists called foraminifera. This proxy works because the levels of the iodine species (iodate) which can be incorporated into foraminiferal shells is linked to the oxygen content of the water they live in. Although this proxy has already been described and utilized in studies to reconstruct marine oxygen concentrations over multiple periods of global change, it has not yet been experimentally verified using controlled laboratory conditions or systematically screened for an impact of diagenesis (alteration of the fossil material that occurs after it is deposited in the sediments). To this end, we will: (1) conduct experiments on benthic and planktonic foraminifera to document the uptake of iodate into foraminiferal calcite, testing for systematic offsets from predicted rates that exist in some proxies. These experiments include plans for a novel radiotracer approach using iodine-129, a rare isotope of iodine which can be used to track ambient iodine uptake into the test in culture. (2) Compare the I/Ca values of foraminiferal specimens from neighboring assemblages from the Pacific Ocean that have very different preservation states to test for an effect of diagenesis on foraminiferal I/Ca. (3) Apply the foraminiferal I/Ca proxy to reconstruct the redox dynamics of the Eastern Tropical Pacific region during the MCO by measuring planktonic and benthic foraminifera I/Ca along with stable carbon and oxygen isotopes in two key localities off the coasts of Mexico and Peru. Through this work we will strengthen an increasingly popular proxy system that can be applied to study many different regional and global paleoclimate events and constrain links between elevated atmospheric carbon dioxide and marine ODZs relevant to today during an analogous interval in Earth’s history.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.
有孔虫I/Ca古氧化还原代用品的研制与应用海水中溶解氧的含量变化很大,与海洋中的生物分布有关。海洋缺氧区的扩大是气候变化的预期结果,缺氧区的氧含量低到足以限制可居住性。随着我们努力预测这将如何影响未来的海洋,研究过去气候变化事件中的海洋氧化作用越来越有价值。中新世气候适宜期(MCO)发生在约1500万至1700万年前,在此期间,地球平均温度上升至3摄氏度,大气中二氧化碳含量上升至约400- 500 ppm。多方面的证据表明,在MCO期间,地球仪周围严重的臭氧消耗区加剧,但缺乏直接证据。我们将使用实验来验证和应用有孔虫的碘钙(I/Ca)代理,它使用的碘含量的微观化石,以估计海洋氧浓度沉积物从MCO在热带太平洋东部,研究在该地区的低氧强度在MCO和改善预测ODZ的变化在未来的气候变化情景。该项目结合了实验室实验,实地工作和分析程序,将纳入国际海洋发现计划档案以及研究生和本科生的培训和研究经验(包括指导拉丁美洲本科STEM专业的具体计划)。这项工作包括三个独立但相互关联的项目,以测试,地面实况,并应用有孔虫I/Ca代理。有孔虫I/Ca代用品是一种基于称为有孔虫的原生生物的微观外壳的碘浓度来重建古海洋中氧浓度的方法。这种替代物之所以有效,是因为可以结合到有孔虫外壳中的碘物质(碘酸盐)的水平与它们生活的水中的氧含量有关。虽然这一代用指标已被描述并用于重建多个全球变化时期海洋氧浓度的研究,但尚未使用受控的实验室条件进行实验验证,也未系统地筛选成岩作用(沉积在沉积物中后发生的化石材料的改变)的影响。为此,我们将:(1)对底栖有孔虫和浮游有孔虫进行实验,以记录有孔虫方解石对碘酸盐的吸收情况,测试某些代用指标中存在的预测率的系统性偏移。这些实验包括使用碘-129的新型放射性示踪剂方法的计划,碘-129是一种罕见的碘同位素,可用于跟踪培养物中测试的环境碘摄取。(2)比较来自太平洋具有非常不同的保存状态的相邻组合的有孔虫标本的I/Ca值,以测试成岩作用对有孔虫I/Ca的影响。(3)通过测量墨西哥和秘鲁沿海两个关键地点的浮游和底栖有孔虫I/Ca沿着和稳定的碳和氧同位素,应用有孔虫I/Ca代用品重建MCO期间热带东太平洋区域的氧化还原动力学。通过这项工作,我们将加强一个越来越受欢迎的代理系统,该系统可用于研究许多不同的区域和全球古气候事件,并限制在地球历史上类似的时间间隔内与今天相关的大气二氧化碳和海洋臭氧消耗区之间的联系。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响进行评估,被认为值得支持审查标准。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Janet Burke其他文献
Janet Burke的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
相似国自然基金
PRF联合BMSCs促进ADM修复全层皮肤缺损创面的实验研究
- 批准号:
- 批准年份:2025
- 资助金额:0.0 万元
- 项目类别:省市级项目
PRF牙髓血运重建术对年轻恒牙牙髓坏死患儿牙周龈沟液炎性因子、bFGF、VEGF水平和预后的影响
- 批准号:2025JJ80540
- 批准年份:2025
- 资助金额:0.0 万元
- 项目类别:省市级项目
uNK细胞分泌PRF1/Gz-B细胞颗粒诱导HVT细胞焦亡在反复种植失败中的机制研究
- 批准号:
- 批准年份:2024
- 资助金额:0 万元
- 项目类别:青年科学基金项目
i-PRF诱导巨噬细胞极化对毛囊生长周期调控的作用机制研究
- 批准号:
- 批准年份:2022
- 资助金额:30 万元
- 项目类别:青年科学基金项目
磁纳米增强的磁共振PRF测温方法及关键技术研究
- 批准号:62103309
- 批准年份:2021
- 资助金额:30 万元
- 项目类别:青年科学基金项目
变PRF体制星载SAR通用信号模型与处理方法研究
- 批准号:61901446
- 批准年份:2019
- 资助金额:28.5 万元
- 项目类别:青年科学基金项目
免疫调控巨噬细胞极化的ADMSCs/PRF支架对慢性难治性创面的修复及机制研究
- 批准号:81801857
- 批准年份:2018
- 资助金额:20.0 万元
- 项目类别:青年科学基金项目
IDO在PRF微环境调控BMSCs抑制异体皮肤移植排斥反应中的作用及机制
- 批准号:81772072
- 批准年份:2017
- 资助金额:56.0 万元
- 项目类别:面上项目
冻干PRF干粉复合成骨性ADSCs聚集体用于构建可注射的组织工程骨的实验研究
- 批准号:81700943
- 批准年份:2017
- 资助金额:20.0 万元
- 项目类别:青年科学基金项目
前列消汤干预自身免疫性前列腺炎TGF-β1/Smads通路调控Th17、PrF细胞分化的研究
- 批准号:81660796
- 批准年份:2016
- 资助金额:40.0 万元
- 项目类别:地区科学基金项目
相似海外基金
Postdoctoral Fellowship: OPP-PRF: Leveraging Community Structure Data and Machine Learning Techniques to Improve Microbial Functional Diversity in an Arctic Ocean Ecosystem Model
博士后奖学金:OPP-PRF:利用群落结构数据和机器学习技术改善北冰洋生态系统模型中的微生物功能多样性
- 批准号:
2317681 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
OPP-PRF: Linking the Physical and Chemical Drivers of Carbon Cycling in Arctic Source-to-sink Systems
OPP-PRF:将北极源-汇系统中碳循环的物理和化学驱动因素联系起来
- 批准号:
2419995 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
Postdoctoral Fellowship: OPP-PRF: Understanding the Role of Specific Iron-binding Organic Ligands in Governing Iron Biogeochemistry in the Southern Ocean
博士后奖学金:OPP-PRF:了解特定铁结合有机配体在控制南大洋铁生物地球化学中的作用
- 批准号:
2317664 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
Postdoctoral Fellowship: OPP-PRF: Identifying Central and Peripheral Thermosensors in Eurythermal and Stenothermal Arctic Fishes
博士后奖学金:OPP-PRF:识别广温和窄温北极鱼类的中央和外周热传感器
- 批准号:
2317970 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
Postdoctoral Fellowship: OPP-PRF: Deciphering the Role of Phytoplankton Community Composition in Southern Ocean Carbon Fluxes
博士后奖学金:OPP-PRF:破译浮游植物群落组成在南大洋碳通量中的作用
- 批准号:
2317998 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
AGS-PRF: Understanding Historical Trends in Tropical Pacific Sea Surface Temperature Patterns
AGS-PRF:了解热带太平洋海面温度模式的历史趋势
- 批准号:
2317224 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Fellowship Award
AGS-PRF: Characterizing the Physicochemical Properties of Primary and Secondary Ultrafine Particles from Brake Emissions
AGS-PRF:表征制动排放中的一次和二次超细颗粒的物理化学性质
- 批准号:
2324901 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Fellowship Award
Postdoctoral Fellowship: OCE-PRF: Using machine learning to investigate temporal dynamics of methane seep fauna at the Ocean Observatories Initiative (OOI) Regional Cabled Array
博士后奖学金:OCE-PRF:利用机器学习研究海洋观测计划 (OOI) 区域有线阵列中甲烷渗漏动物群的时间动态
- 批准号:
2307504 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
Postdoctoral Fellowship: OCE-PRF: Do dead shells make good homes? Assessing the Development, Stability, and Evolution of Shell Gravel Habitats Across Space and Time
博士后奖学金:OCE-PRF:死去的贝壳能成为美好的家园吗?
- 批准号:
2307502 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant
Postdoctoral Fellowship: OPP-PRF: Tracking Long-Term Changes in Lake Area across the Arctic
博士后奖学金:OPP-PRF:追踪北极地区湖泊面积的长期变化
- 批准号:
2317873 - 财政年份:2024
- 资助金额:
$ 30.47万 - 项目类别:
Standard Grant