NE Pacific sedimentary geomagnetic network analysis (GNA) to facilitate a better understanding of time, climate, and the geomagnetic field
东北太平洋沉积地磁网络分析 (GNA),有助于更好地了解时间、气候和地磁场
基本信息
- 批准号:1929486
- 负责人:
- 金额:$ 49.84万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2019
- 资助国家:美国
- 起止时间:2019-08-01 至 2024-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Chronology and dating of paleo-records is a fundamental challenge that confronts our understanding of global systems. Radiocarbon is a remarkable tool for meeting this challenge by allowing determination of precise ages in diverse environments that are less than around 50,000 years old. However, beyond the Holocene (last 11,500 years), due to limitations of the method, it is often impossible to make meaningful comparisons between records where uncertainties of a thousand years or less are required. Century to millennial variations in the direction and intensity of the Earth's geomagnetic field, known as paleomagnetic secular variation (PSV), offer an alternate signal that can be used for detailed stratigraphic alignment. This project will further the development of geomagnetic network analysis (GNA), a new approach based on the combining of multiple PSV records to improve our use of radiocarbon to tell time in the past. Utilizing a series of Integrated Ocean Drilling Program (IODP) drill cores from the NE Pacific, the research team will produce critical data that will improve understanding of Earth's magnetic field and yield high-resolution age models that will benefit the larger earth science community. The resulting chronology will improve our understanding of NE Pacific millennial scale climate, while also serving as a foundation for global paleomagnetic comparisons needed to test our understanding of secular variation and magnetic field changes. The project supports two early career investigators, one from an underrepresented group, and provides student training at the graduate and undergraduate levels. In addition, a short course will be developed and implemented to train other potential users.Improved radiocarbon to calendar age corrections and new data modeling approaches constrain and reduce uncertainties of both dates and the age models that run between them, making radiocarbon an almost 'one-stop shop' for high precision, highly accurate, and well constrained chronologies. Yet, beyond the Holocene, due to a host of both practical and intrinsic limitations on the number, the precision, and accuracy of those dates, it is often impossible to make meaningful comparisons between records where millennial or shorter uncertainties are required, making it difficult to test many Earth system hypotheses. The paleomagnetic record of geomagnetic change offers several approaches that may avoid some of these pitfalls. Centennial to millennial variations in direction and intensity of the geomagnetic field, known as paleomagnetic secular variation (PSV), offer an environmentally independent signal that can be used for detailed stratigraphic alignment. Based on the reasonable assumption that sediments within a limited geographic region have experienced a common geomagnetic history, one can use the PSV record to align stratigraphies irrespective of age. These depth-to-depth correlations, referred to as a geomagnetic network analysis (GNA), allow regional organization of chronological constraints from multiple sequences to be combined into a single age-depth profile. As a result, chronological precision and even accuracy can be improved, while reconstructing the paleomagnetic record of a region through time. GNA could greatly benefit our chronological understanding at many locations around the globe but needs to be tested and evaluated. This project will develop, assess, and quantify many of the aspects of GNA starting with a series of IODP cores from the NE Pacific that are optimal because of their very high sedimentation rates. The research team will obtain additional radiocarbon dates, XRF scanning, CT scanning, and paleomagnetic data (u-channel and discrete) to facilitate a chronostratigraphic modeling study that will combine the records using PSV and their independent radiocarbon chronologies into a single merged depth scale to facilitate a much more detailed understanding of the depth to age transformation. As a result, this project potentially sets the stage for the next generation of magnetic stratigraphy. The project will support two early career researchers and includes student training at the graduate and undergraduate levels.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.
古记录的年代学和年代测定是我们对全球系统的理解所面临的一个基本挑战。 放射性碳是应对这一挑战的一个重要工具,它可以在不同环境中确定不到5万年的精确年龄。然而,在全新世(过去11,500年)之后,由于方法的局限性,通常不可能在需要一千年或更少不确定性的记录之间进行有意义的比较。地球地磁场的方向和强度的世纪到千年的变化,称为古地磁长期变化(PSV),提供了一个可用于详细地层对齐的替代信号。该项目将进一步发展地磁网络分析(GNA),这是一种基于多个PSV记录相结合的新方法,以改进我们过去使用放射性碳来判断时间。利用来自东北太平洋的一系列综合海洋钻探计划(IODP)岩心,研究团队将产生关键数据,这些数据将提高对地球磁场的理解,并产生高分辨率的年龄模型,这将有利于更大的地球科学界。由此产生的年代学将提高我们对东北太平洋千年尺度气候的了解,同时也可以作为测试我们对长期变化和磁场变化的理解所需的全球古地磁比较的基础。该项目支持两名早期职业调查员,其中一名来自代表性不足的群体,并提供研究生和本科生培训。此外,还将开发和实施一个短期课程,以培训其他潜在用户。改进的放射性碳对日历年龄的校正和新的数据建模方法,限制和减少了日期和它们之间运行的年龄模型的不确定性,使放射性碳成为几乎“一站式"的高精度,高准确性和良好的约束年表。然而,在全新世之后,由于这些日期的数量、精确度和准确性方面存在许多实际和内在的限制,通常不可能在需要千年或更短时间不确定性的记录之间进行有意义的比较,这使得很难测试许多地球系统假设。地磁变化的古地磁记录提供了几种可能避免这些陷阱的方法。地磁场方向和强度的百年至千年变化,称为古地磁长期变化(PSV),提供了一个与环境无关的信号,可用于详细的地层对齐。基于一个合理的假设,即在一个有限的地理区域内的沉积物经历了一个共同的地磁历史,人们可以使用PSV记录来调整地层,而不考虑年龄。这些深度到深度的相关性,被称为地磁网络分析(GNA),允许区域组织的时序约束从多个序列被组合成一个单一的年龄-深度剖面。因此,在重建一个地区的古地磁记录时,可以提高年代学精度甚至精度。GNA可以极大地帮助我们在地球仪的许多地方的时间顺序的理解,但需要进行测试和评估。该项目将从东北太平洋的一系列IODP岩心开始,开发、评估和量化GNA的许多方面,这些岩心由于其非常高的沉积速率而最佳。研究小组将获得额外的放射性碳年代测定、X射线荧光扫描、CT扫描和古地磁数据(u通道和离散),以促进年代地层建模研究,该研究将联合收割机使用PSV及其独立的放射性碳年代学记录结合到一个合并的深度尺度中,以促进对深度到年龄转换的更详细的理解。因此,该项目可能为下一代磁性地层学奠定基础。该项目将支持两名早期职业研究人员,并包括研究生和本科生水平的学生培训。该奖项反映了NSF的法定使命,并已被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans
- DOI:10.1126/science.aba7096
- 发表时间:2020-11-06
- 期刊:
- 影响因子:56.9
- 作者:Walczak, Maureen H.;Mix, Alan C.;Zellers, Sarah D.
- 通讯作者:Zellers, Sarah D.
High resolution inclination records from the Gulf of Alaska, IODP Expedition 341 Sites U1418 and U1419
阿拉斯加湾 IODP 探险队 341 站点 U1418 和 U1419 的高分辨率倾角记录
- DOI:10.1093/gji/ggab479
- 发表时间:2021
- 期刊:
- 影响因子:2.8
- 作者:Velle, Julie Heggdal;Walczak, Maureen H.;Reilly, Brendan;St-Onge, Guillaume;Stoner, Joseph S.;Fallon, Stewart;Mix, Alan C.;Belanger, Christina;Forwick, Matthias
- 通讯作者:Forwick, Matthias
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Joseph Stoner其他文献
Enhanced mercury deposition in Arctic Alaskan lake sediments coincides with early Holocene hydroclimate shift
北极阿拉斯加湖泊沉积物中汞沉积的增加与全新世早期的水文气候变化相吻合
- DOI:
10.1016/j.scitotenv.2025.178440 - 发表时间:
2025-01-25 - 期刊:
- 影响因子:8.000
- 作者:
Melissa Griffore;Mark Abbott;Eitan Shelef;Matthew Finkenbinder;Joseph Stoner;Mary Edwards - 通讯作者:
Mary Edwards
Joseph Stoner的其他文献
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{{ truncateString('Joseph Stoner', 18)}}的其他基金
Continued Curation of the Marine Geology and Geophysics Collection in the OSU/CEOAS Marine and Geology Repository
继续管理 OSU/CEOAS 海洋和地质知识库中的海洋地质和地球物理学馆藏
- 批准号:
2310875 - 财政年份:2023
- 资助金额:
$ 49.84万 - 项目类别:
Continuing Grant
Continued Operation of the OSU/CEOAS Marine and Geology Repository
OSU/CEOAS 海洋和地质知识库的持续运行
- 批准号:
2116254 - 财政年份:2021
- 资助金额:
$ 49.84万 - 项目类别:
Standard Grant
Developing a high-resolution Holocene paleo-geomagnetic reconstruction from northern North Atlantic sediments to place the historical geomagnetic field in perspective
从北大西洋北部沉积物中进行高分辨率全新世古地磁重建,以透视历史地磁场
- 批准号:
1645411 - 财政年份:2017
- 资助金额:
$ 49.84万 - 项目类别:
Standard Grant
Continued Operation of the OSU/CEOAS Marine Geology Repository
OSU/CEOAS 海洋地质资料库的持续运行
- 批准号:
1558679 - 财政年份:2016
- 资助金额:
$ 49.84万 - 项目类别:
Continuing Grant
Developing new magnetic tracers of ice sheet instability and ocean circulation in the northern North Atlantic
开发北大西洋北部冰盖不稳定和海洋环流的新型磁示踪剂
- 批准号:
1636381 - 财政年份:2016
- 资助金额:
$ 49.84万 - 项目类别:
Standard Grant
Collaborative Research: Development of a Suite of Proxies to Detect Past Collapse of the West Antarctic Ice Sheet
合作研究:开发一套代理来检测南极西部冰盖过去的崩塌
- 批准号:
1443437 - 财政年份:2015
- 资助金额:
$ 49.84万 - 项目类别:
Standard Grant
CSEDI Collaborative Research: Towards a unified model of the geomagnetic, geochemical, and thermal evolutions of Earth's mantle and core
CSEDI 合作研究:建立地幔和地核地磁、地球化学和热演化的统一模型
- 批准号:
1361221 - 财政年份:2014
- 资助金额:
$ 49.84万 - 项目类别:
Standard Grant
Linking magnetic and isotopic data from Gulf of Alaska deep-sea cores: understanding the region's contribution to global oceanographic variability and the earth's magnetic field
将阿拉斯加湾深海核心的磁数据和同位素数据联系起来:了解该地区对全球海洋变化和地球磁场的贡献
- 批准号:
1436903 - 财政年份:2014
- 资助金额:
$ 49.84万 - 项目类别:
Standard Grant
Collaborative Research: Deep Drilling of Lake Junin, Peru: Continuous Tropical Records of Glaciation, Climate Change and Magnetic Field Variations Spanning the Late Quaternary
合作研究:秘鲁胡宁湖深钻:晚第四纪冰川作用、气候变化和磁场变化的连续热带记录
- 批准号:
1400903 - 财政年份:2014
- 资助金额:
$ 49.84万 - 项目类别:
Continuing Grant
Continued Operation of the OSU/CEOAS Marine Geology Repository
OSU/CEOAS 海洋地质资料库的持续运行
- 批准号:
1259292 - 财政年份:2013
- 资助金额:
$ 49.84万 - 项目类别:
Continuing Grant
相似海外基金
Late Holocene ITCZ Shifts from Sedimentary Lipids on Tropical Pacific Islands
全新世晚期 ITCZ 从热带太平洋岛屿上的沉积脂质转变
- 批准号:
0823503 - 财政年份:2008
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REE and Nd-Sr isotope provenance signatures in clastic sedimentary terranes and geological evolution of the Asia-Pacific margin
碎屑沉积地体中的 REE 和 Nd-Sr 同位素物源特征及亚太边缘的地质演化
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13440147 - 财政年份:2001
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Grant-in-Aid for Scientific Research (B)
Sedimentary Event Recorded in Pelagic Sediments in the Circum-Pacific Mesozoic Accretionary Complexes
环太平洋中生代增生杂岩中上层沉积物记录的沉积事件
- 批准号:
08640567 - 财政年份:1996
- 资助金额:
$ 49.84万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Response of the Eq. Pacific to Quaternary Climate Change: Sedimentary Chemical Evidence For Glacial-Interglacial Contrasts in Productivity and Chemical Transport Rate
方程的响应。
- 批准号:
9301097 - 财政年份:1993
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$ 49.84万 - 项目类别:
Continuing grant
Development of a Reference Base for Eolian Sedimentary Studies in the Pacific and to Apply it to Studies of Quaternary Eolian Sedimentation in the Equatorial Pacific
太平洋风成沉积研究参考基地的建立及其在赤道太平洋第四纪风成沉积研究中的应用
- 批准号:
9102385 - 财政年份:1991
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$ 49.84万 - 项目类别:
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Sedimentary Microbiological Communities Across the Equatorial Pacific Carbon-Flux Gradient: Biomass, Composition, Carbon-Utilization Rates, and Production
赤道太平洋沉积微生物群落碳通量梯度:生物量、组成、碳利用率和产量
- 批准号:
9022408 - 财政年份:1991
- 资助金额:
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Use of Sedimentary Nitrogen and Carbon Isotopic Composition for Reconstruction of the Past History of the Equatorial Pacific Upwelling Region
利用沉积氮和碳同位素组成重建赤道太平洋上升流区的过去历史
- 批准号:
9115641 - 财政年份:1991
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Sedimentary Hiatuses in the Central Basin of the Pacific: Paleoceanographic Implications
太平洋中央盆地的沉积间断:古海洋学意义
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8504146 - 财政年份:1985
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$ 49.84万 - 项目类别:
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Pliocene Paleoclimatic Variability Measured in Equatorial Pacific Deep-Sea Sedimentary Sequences
赤道太平洋深海沉积层序测量的上新世古气候变化
- 批准号:
8315253 - 财政年份:1984
- 资助金额:
$ 49.84万 - 项目类别:
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Pliocene Paleoclimatic Variability Measured in Equatorial Pacific Deep-Sea Sedimentary Sequences
赤道太平洋深海沉积层序测量的上新世古气候变化
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8315471 - 财政年份:1984
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