Reassessment of the Mono Lake Excursion

莫诺湖游览的重新评估

基本信息

  • 批准号:
    0609770
  • 负责人:
  • 金额:
    $ 15.5万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2006
  • 资助国家:
    美国
  • 起止时间:
    2006-07-01 至 2009-06-30
  • 项目状态:
    已结题

项目摘要

The Mono Lake Excursion occurred around 35,000 years ago. It represents the most recent time when the Earth's magnetic field has gone through an anomalous, large-scale change in its space/time pattern, perhaps even changing globally into a profoundly different configuration, an excursional state. The Mono Lake Excursion was defined from paleomagnetic studies of lacustrine sediments at Mono Lake, California. This study addresses several unresolved issues surrounding the Mono Lake Excursion. There is currently no record of the complete directional waveform or paleointensity pattern associated with the Mono Lake Excursion outside its type locality at Mono Lake. There is still legitimate uncertainty about the absolute age of the Mono Lake Excursion. There is no high-resolution record of the Mono Lake Excursion in deep-sea sediments from western North America (near Mono Lake), which have an oxygen-isotope chronostratigraphy that can tie the excursion to the global GISP2 ice-core chronology, Heinrich Events, or Dansgaard/Oeschger cyclicity. Assuming (as we do) that the Mono Lake Excursion is ~6000 years younger than the Laschamp Excursion (the next older excursion about 41,000 years ago), what is the relationship between them (if any)? The current study is recovering paleomagnetic records of secular variation and paleointensity from deep-sea sediments of the eastern North Pacific Ocean, off the Oregon coast, and lacustrine sediments from Baldwin Lake, Southern California. The deep-sea sediments have a high-resolution oxygen-isotope record associated with them and the lake record has more than 20 radiocarbon dates that bracket the Mono Lake/Laschamp Excursion interval. Preliminary paleomagnetic results indicate that the Mono Lake Excursion and the older Laschamp Excursion are present in both records with ages that are consistent with previous estimates. The new paleomagnetic records will be combined with previously published far-field paleomagnetic records of the Mono-Lake/Laschamp Excursion intervals from the Arctic Ocean, North Atlantic Ocean, Philippine Islands, and Chile coastal margin to define the space-time pattern of global field variability associated with the Mono Lake Excursion. These data will also be used to build a series of low-degree spherical harmonic models that quantitatively describe that pattern of variability on a global scale. Such observations are required to test concepts of geomagnetic field timescales of variability, the origin and nature of excursions, and their relationship to dynamo behavior.This study is using a high-school student, USC graduate student, and post-doctoral researcher to make measurements and help in the data analysis. The final paleomagnetic data sets and spherical harmonic analyses will be available at the PI's website (http://earth.usc.edu/~slund) and forwarded to other database initiatives.
莫诺湖游览发生在大约 35,000 年前。它代表了地球磁场的空间/时间模式经历了异常的大规模变化的最近一次,甚至可能在全球范围内转变为一种截然不同的配置,一种偏移状态。莫诺湖游览是根据对加利福尼亚州莫诺湖湖相沉积物的古地磁研究而定义的。这项研究解决了围绕莫诺湖游览的几个未解决的问题。目前还没有与莫诺湖的模式产地之外的莫诺湖偏移相关的完整方向波形或古强度模式的记录。关于莫诺湖游览的绝对年龄仍然存在合理的不确定性。北美西部(莫诺湖附近)的深海沉积物中没有莫诺湖偏移的高分辨率记录,这些沉积物具有氧同位素年代地层学,可以将莫诺湖偏移与全球 GISP2 冰芯年代学、海因里希事件或丹斯加德/厄施格周期联系起来。假设(正如我们所做的那样)莫诺湖游览比拉尚游览(大约 41,000 年前的下一个更古老的游览)年轻约 6000 年,它们之间的关系是什么(如果有的话)?目前的研究正在从俄勒冈州海岸附近北太平洋东部的深海沉积物和南加州鲍德温湖的湖泊沉积物中恢复长期变化和古强度的古地磁记录。深海沉积物有与之相关的高分辨率氧同位素记录,湖泊记录有 20 多个包含莫诺湖/拉尚游览区间的放射性碳年代。初步的古地磁结果表明,莫诺湖偏移和更古老的拉尚偏移都出现在这两个记录中,其年龄与之前的估计一致。新的古地磁记录将与之前发布的北冰洋、北大西洋、菲律宾群岛和智利沿海边缘的莫诺湖/拉尚偏移间隔的远场古地磁记录相结合,以定义与莫诺湖偏移相关的全球磁场变化的时空模式。这些数据还将用于构建一系列低次球谐模型,定量描述全球范围内的变异模式。需要进行此类观察来测试地磁场变化时间尺度、偏移的起源和性质以及它们与发电机行为的关系的概念。这项研究使用一名高中生、南加州大学研究生和博士后研究员来进行测量并帮助进行数据分析。最终的古地磁数据集和球谐分析将在 PI 网站 (http://earth.usc.edu/~slund) 上提供,并转发给其他数据库计划。

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)

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Steven Lund其他文献

Reducing uncertainty in the evaluation of stem cell colonies
  • DOI:
    10.1016/j.jcyt.2015.03.420
  • 发表时间:
    2015-06-01
  • 期刊:
  • 影响因子:
  • 作者:
    Anne Plant;Michael Halter;Steven Lund;Adele Peskin;Ya-Shian Li-Baboud;Daniel Hoeppner;Peter Bajcsy
  • 通讯作者:
    Peter Bajcsy

Steven Lund的其他文献

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{{ truncateString('Steven Lund', 18)}}的其他基金

Reanalysis of Paleomagnetic Secular Variation and Excursions During Early Brunhes Time (380-780 ka) at ODP Sites 1060, 1061, 1062, and 1063
ODP 站点 1060、1061、1062 和 1063 早期 Brunhes 时间(380-780 ka)古地磁长期变化和偏移的再分析
  • 批准号:
    2219330
  • 财政年份:
    2022
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Estimating the Character of Paleomagnetic Field Excursions and Surrounding Secular Variation at Equatorial Latitudes (Equatorial W. Atlantic; MIS 1-4)
估计赤道纬度古磁场偏移和周围长期变化的特征(赤道西大西洋;MIS 1-4)
  • 批准号:
    1547605
  • 财政年份:
    2016
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Graduate Research at Michigan State University to Push the Intensity Frontier and Support Accelerator Science
密歇根州立大学研究生研究推动强度前沿并支持加速器科学
  • 批准号:
    1632761
  • 财政年份:
    2016
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Filling Holes in the Holocene Geomagnetic Field - Tropical East Africa
填补全新世地磁场的空洞 - 热带东非
  • 批准号:
    1316507
  • 财政年份:
    2013
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Evidence for Geomagnetic Field Excursions Recorded in Postglacial (9-15,000 Calendar YBP) Carbonates of the Tahiti Coral Reef
大溪地珊瑚礁冰后(9-15,000 历 YBP)碳酸盐中记录的地磁场偏移的证据
  • 批准号:
    0943857
  • 财政年份:
    2010
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Expedition 323 Objective Research on the Paleoceanography of the Bering Sea
合作研究:323远征队白令海古海洋学客观研究
  • 批准号:
    0962385
  • 财政年份:
    2010
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Continuing Grant
Chronostratigraphy and Environmental Variability in Postglacial Carbonates of the Tahiti Coral Reef
大溪地珊瑚礁冰后碳酸盐的年代地层学和环境变化
  • 批准号:
    0751827
  • 财政年份:
    2008
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Pleistocene Geomagnetic Field Variability from the High-Latitude Southern Hemisphere
合作研究:南半球高纬度更新世地磁场变化
  • 批准号:
    0635348
  • 财政年份:
    2007
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Collaborative Research/RUI: Assessing Multi-scale Holocene Climate Variability in Western North America Using Sediments from Lake Elsinore (Southern CA)
合作研究/RUI:利用埃尔西诺湖(加利福尼亚州南部)的沉积物评估北美西部多尺度全新世气候变化
  • 批准号:
    0602245
  • 财政年份:
    2006
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Continuing Grant
Upgrade of the Paleomagnetism/Rock Magnetism Laboratory at the University of Southern California
南加州大学古地磁/岩石磁学实验室升级
  • 批准号:
    0349894
  • 财政年份:
    2004
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant

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    2017
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相似海外基金

Collaborative Research: Deglacial and Holocene Environmental Change in California's Headwaters: Insights from High-Resolution Sedimentary Records from Mono Lake
合作研究:加利福尼亚州源头的冰消期和全新世环境变化:莫诺湖高分辨率沉积记录的见解
  • 批准号:
    1828862
  • 财政年份:
    2018
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Deglacial and Holocene Environmental Change in California's Headwaters: Insights from High-Resolution Sedimentary Records from Mono Lake
合作研究:加利福尼亚州源头的冰消期和全新世环境变化:莫诺湖高分辨率沉积记录的见解
  • 批准号:
    1829093
  • 财政年份:
    2018
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
EAGER: Proof of concept: U-Th Dating of Lake-level History at Mono Basin, CA
EAGER:概念证明:加州莫诺盆地湖面历史 U-Th 测年
  • 批准号:
    1353272
  • 财政年份:
    2013
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
RUI: The Laschamp and Mono Lake Excursions in High Deposition Rate Sediments from Summer Lake, Oregon, USA
RUI:来自美国俄勒冈州萨默湖的高沉积率沉积物中的拉尚和莫诺湖游览
  • 批准号:
    0911351
  • 财政年份:
    2009
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    $ 15.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Paleomagnetism and Geochronology of the Mono Lake Event [?] Recorded in the Lava Section at Santa Maria Volcano, Guatemala
合作研究:危地马拉圣玛丽亚火山熔岩剖面记录的莫诺湖事件 [?] 的古地磁学和地质年代学
  • 批准号:
    0439592
  • 财政年份:
    2005
  • 资助金额:
    $ 15.5万
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Collaborative Research: Paleomagnetism and Geochronology of the Mono Lake Event [?] Recorded in the Lava Flow Sequence of Santa Maria Volcano, Guatemala
合作研究:危地马拉圣玛丽亚火山熔岩流序列中记录的莫诺湖事件[?]的古地磁学和地质年代学
  • 批准号:
    0439155
  • 财政年份:
    2005
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    $ 15.5万
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Collaborative Research: Ecology of Viruses in an Alkaline, Hypersaline Lake, Mono Lake, California
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  • 批准号:
    0129160
  • 财政年份:
    2002
  • 资助金额:
    $ 15.5万
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    Standard Grant
Collaborative Research: Ecology of Viruses in an Alkaline, Hypersaline Lake, Mono Lake, California
合作研究:加利福尼亚州莫诺湖碱性超盐湖中的病毒生态学
  • 批准号:
    0130528
  • 财政年份:
    2002
  • 资助金额:
    $ 15.5万
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Collaborative Research: Ecology of Viruses in an Alkaline, Hypersaline Lake, Mono Lake, California
合作研究:加利福尼亚州莫诺湖碱性超盐湖中的病毒生态学
  • 批准号:
    0129174
  • 财政年份:
    2002
  • 资助金额:
    $ 15.5万
  • 项目类别:
    Standard Grant
Collaborative Research: Microbial Observatory at an Alkaline, Hypersaline, Meromictic Lake (Mono Lake, California)
合作研究:碱性、超盐、半罗密湖(加利福尼亚州莫诺湖)的微生物观测站
  • 批准号:
    9977892
  • 财政年份:
    1999
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