Development of Technique: Systematically measuring the cosmogenic 26Al/10Be production ratio at a variety of altitudes and latitudes
技术开发:系统测量不同海拔、纬度的宇宙成因 26Al/10Be 生成比
基本信息
- 批准号:1733887
- 负责人:
- 金额:$ 9.35万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-04-15 至 2022-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Geologists use many rare isotopes of different elements to date events in the past, both natural and those related to humans. One particularly widely applied system compares the ratio of 26Al to 10Be in samples that have been exposed at the surface of the earth and then buried. To create ages from a measured ratio of 26Al/10Be, researchers need to know the ratio of 26Al/10Be after exposure but before burial. While this ratio has been estimated before, its value is not well known and appears to vary around the world. This project will be the first to measure the 26Al/10Be ratio in over 150 different samples that have already been collected and will thus provide the information needed for many researchers in a variety of fields (geology, glaciology, archeology) to generate more accurate 26Al/10Be burial ages. The new data will also allow much better understanding of the uncertainty of these ages. This work will train a graduate student in science and will improve dates of ancient human remains as well as past changes in Earth's climate, including the coming and going of glaciers.Knowing the surface production ratio of 26Al/10Be is critical for the calculation of two-isotope burial ages because a measured 26Al/10Be ratio less than the production ratio can be interpreted quantitatively as the duration of burial after surface exposure of a sample. Although 26Al/10Be dating has been widely applied (and many of the applications have been supported by NSF), the 26Al/10Be ratio at production is not well constrained by data. Recent measurements suggest that the ratio is at least 8% higher in Greenland than the canonical value of 6.75, which is derived primarily from one series of early 1990s measurements made at high elevation in the mid latitudes. Physics-based models and some other new data suggest that the 26Al/10Be surface production ratio should vary systematically with latitude and altitude. Here, this project will test for spatial variance and determine the 26Al/10Be surface production ratio empirically as a function of latitude (5-45° in both hemispheres) and altitude (0 to 5000 meters above sea level.). The team will do this by making 150 high-precision 26Al analyses of archived samples already prepared and previously analyzed for 10Be. The team will compare this data-driven determination of the 26Al/10Be surface production ratio with predictions made using numerical models of nuclide production. The project will increase the broader impact of this work by disseminating the results both at meetings and in at least one peer-reviewed publication. This will ensure that the community is aware of and can easily use the data that are generated to improve the accuracy of 26Al/10Be two-isotope dating. Additional broader impacts include training a student who will do much of the research and writing.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.
地质学家使用许多不同元素的稀有同位素来确定过去事件的日期,包括自然事件和与人类有关的事件。 一个特别广泛应用的系统比较了暴露在地表然后被掩埋的样品中26 Al与10 Be的比率。 为了从测量的26 Al/10 Be的比率中创建年龄,研究人员需要知道暴露后但埋葬前的26 Al/10 Be比率。 虽然这一比率以前曾被估计过,但其数值并不为人所知,而且似乎在世界各地各不相同。该项目将首次测量已经收集的150多个不同样品中的26 Al/10 Be比率,从而为各个领域(地质学,冰川学,考古学)的许多研究人员提供所需的信息,以产生更准确的26 Al/10 Be埋葬年龄。新的数据也将使我们更好地了解这些年龄的不确定性。这项工作将培养一名科学研究生,并将改进古代人类遗骸的日期以及地球气候过去的变化,知道26 Al/10 Be的表面产生比对于计算两种同位素埋藏年龄是至关重要的,因为测量的26 Al/10 Be的表面产生比是26 Al/10 Be的表面产生比。10 Be比小于产出比可定量解释为样品暴露后埋藏的时间。虽然26 Al/10 Be测年法已被广泛应用(许多应用得到了NSF的支持),但生产中的26 Al/10 Be比率并没有受到数据的很好约束。最近的测量表明,格陵兰岛的这一比例至少比标准值6.75高出8%,标准值主要来自20世纪90年代初在中纬度高海拔地区进行的一系列测量。基于物理的模型和其他一些新的数据表明,26 Al/10 Be的表面生产率应随纬度和高度系统地变化。在这里,该项目将测试空间差异,并根据经验确定26 Al/10 Be表面生产率作为纬度(两个半球5-45°)和海拔(海拔0至5000米)的函数。该团队将通过对已经准备好的存档样品进行150次高精度的26 Al分析来实现这一目标,并且之前已经分析了10 Be。该团队将比较这种数据驱动的26 Al/10 Be表面生产率的确定与使用核素生产数值模型的预测。该项目将通过在会议上和至少在一份同行审查的出版物上传播成果,扩大这项工作的广泛影响。这将确保社区了解并能够轻松使用所生成的数据,以提高26 Al/10 Be双同位素测年的准确性。该奖项反映了NSF的法定使命,并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,被认为值得支持。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Stratigraphic control of landscape response to base-level fall, Young Womans Creek, Pennsylvania, USA
美国宾夕法尼亚州 Young Womans Creek 景观对基准面下降响应的地层控制
- DOI:10.1016/j.epsl.2018.10.005
- 发表时间:2018
- 期刊:
- 影响因子:5.3
- 作者:DiBiase, Roman A.;Denn, Alison R.;Bierman, Paul R.;Kirby, Eric;West, Nicole;Hidy, Alan J.
- 通讯作者:Hidy, Alan J.
The Northwestern Greenland Ice Sheet During The Early Pleistocene Was Similar To Today
更新世早期的格陵兰岛西北部冰盖与今天相似
- DOI:10.1029/2019gl085176
- 发表时间:2020
- 期刊:
- 影响因子:5.2
- 作者:Christ, Andrew J.;Bierman, Paul R.;Knutz, Paul C.;Corbett, Lee B.;Fosdick, Julie C.;Thomas, Elizabeth K.;Cowling, Owen C.;Hidy, Alan J.;Caffee, Marc W.
- 通讯作者:Caffee, Marc W.
Empirical Evidence for Latitude and Altitude Variation of the In Situ Cosmogenic 26Al/10Be Production Ratio
原位宇宙成因 26Al/10Be 生产率随纬度和海拔变化的经验证据
- DOI:10.3390/geosciences11100402
- 发表时间:2021
- 期刊:
- 影响因子:2.7
- 作者:Halsted, Christopher T.;Bierman, Paul R.;Balco, Greg
- 通讯作者:Balco, Greg
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Paul Bierman其他文献
Quartz luminescence sensitivity enhanced by residence time in the critical zone
- DOI:
10.1016/j.quageo.2024.101613 - 发表时间:
2024-10-01 - 期刊:
- 影响因子:
- 作者:
Natalie M. Tanski;Tammy M. Rittenour;Francesco Pavano;Frank Pazzaglia;Jenna Mills;Lee B. Corbett;Paul Bierman - 通讯作者:
Paul Bierman
Climate Change Impact on High-Altitude Ecosystems and Their Impact on Human Communities
气候变化对高海拔生态系统的影响及其对人类社区的影响
- DOI:
- 发表时间:
2015 - 期刊:
- 影响因子:0
- 作者:
Paul Bierman - 通讯作者:
Paul Bierman
Erosional dynamics and escarpment retreat at the southern end of the South American passive margin escarpment
南美被动边缘悬崖南端的侵蚀动力学与悬崖后退
- DOI:
10.1016/j.geomorph.2025.109885 - 发表时间:
2025-10-01 - 期刊:
- 影响因子:3.300
- 作者:
Mauricio B. Haag;Lindsay M. Schoenbohm;Scott Jess;Paul Bierman;Joshua Wolpert;Lee Corbett;Carlos A. Sommer - 通讯作者:
Carlos A. Sommer
Economic Sustainability for Halophyte Cash Farms in Urban Environments
城市环境中盐生现金农场的经济可持续性
- DOI:
- 发表时间:
2014 - 期刊:
- 影响因子:0
- 作者:
Paul Bierman - 通讯作者:
Paul Bierman
Paul Bierman的其他文献
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{{ truncateString('Paul Bierman', 18)}}的其他基金
Collaborative Research: Research Infrastructure: CFS (Track III) Cosmogenic Nuclides in Earth Science Research: Allied facilities for sample preparation, analysis, and training
合作研究:研究基础设施:CFS(第三轨)地球科学研究中的宇宙成因核素:用于样品制备、分析和培训的联合设施
- 批准号:
2300560 - 财政年份:2023
- 资助金额:
$ 9.35万 - 项目类别:
Continuing Grant
Collaborative Research: A fossil ecosystem under the ice: deciphering the glacial and vegetation history of northwest Greenland using long-lost Camp Century basal sediment
合作研究:冰下的化石生态系统:利用失传已久的坎普世纪基底沉积物破译格陵兰岛西北部的冰川和植被历史
- 批准号:
2114629 - 财政年份:2021
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
Collaborative Research: 3 Myr of Laurentide Ice Sheet History Inferred from Cosmogenic Nuclides in Ice-Rafted Debris
合作研究:根据冰筏碎片中的宇宙成因核素推断 3 Myr 的劳伦太德冰盖历史
- 批准号:
2116209 - 财政年份:2021
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
Collaborative Research: A place-based, student-led research project in the Pioneer Mountains, Montana: an investigation of very dry, alpine glaciation proximal to the Laurentide Ic
合作研究:蒙大拿州先锋山脉的一个以地方为基础、由学生主导的研究项目:对劳伦泰德IC附近非常干燥的高山冰川的调查
- 批准号:
2018059 - 财政年份:2020
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
Laboratory Technician Support: National sample preparation facility for broadening participation, research, and hands-on research training in cosmogenic nuclide studies
实验室技术人员支持:国家样品制备设施,用于扩大宇宙成因核素研究的参与、研究和实践研究培训
- 批准号:
1735676 - 财政年份:2018
- 资助金额:
$ 9.35万 - 项目类别:
Continuing Grant
Collaborative Research: The Cuban landscape, quantifying the effects of industrialized agriculture followed by country-wide soil conservation using sediment-associated isotopes
合作研究:古巴景观,量化工业化农业的影响,然后使用沉积物相关同位素进行全国范围的土壤保持
- 批准号:
1719249 - 财政年份:2017
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
COLLABORATIVE RESEARCH: CONSTRAINING THE TIMING AND RATE OF SOUTHEASTERN LAURENTIDE ICE SHEET THINNING DURING THE LAST DEGLACIATION WITH COSMOGENIC NUCLIDE DIPSTICKS
合作研究:用宇宙成因核素试纸限制最后一次冰消过程中东南劳伦特冰盖减薄的时间和速率
- 批准号:
1602280 - 财政年份:2016
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
WORKSHOP SUPPORT - Optimizing the next generation of AMS for measuring 10-Be and 26-Al
研讨会支持 - 优化下一代 AMS 以测量 10-Be 和 26-Al
- 批准号:
1464526 - 财政年份:2015
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Deciphering Spatially and Temporally Complex High-Latitude Landscapes
博士论文研究:解读时空复杂的高纬度景观
- 批准号:
1433878 - 财政年份:2014
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
Collaborative Research: Differentiating Between Lithologic and Baselevel Controls on River Profiles: Canyons of the Colorado Plateau
合作研究:区分河流剖面的岩性和基准面控制:科罗拉多高原的峡谷
- 批准号:
1323866 - 财政年份:2013
- 资助金额:
$ 9.35万 - 项目类别:
Standard Grant
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