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。它代表了地球磁场在其时空模式中经历了异常的大规模变化的最近时间,甚至可能在全球范围内改变为一种完全不同的配置,一种电磁状态。莫诺湖漂移是根据对加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几个悬而未决的问题。目前还没有记录的完整的方向波形或paleointensity模式与莫诺湖远足以外的莫诺湖的典型地点。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(靠近莫诺湖)的深海沉积物中没有莫诺湖漂移的高分辨率记录,这些沉积物具有氧同位素年代地层学,可以将漂移与全球GISP 2冰芯年代学,海因里希事件或Dansgaard/Oeschger旋回联系起来。假设(正如我们所做的)莫诺湖远足比拉尚远足(大约41,000年前的下一次更古老的远足)年轻6000年,它们之间的关系是什么(如果有的话)?目前的研究是恢复古地磁记录的长期变化和古强度从深海沉积物的北太平洋东部,离俄勒冈州海岸,湖沉积物从鲍德温湖,南加州。深海沉积物有一个高分辨率的氧同位素记录与他们和湖泊记录有20多个放射性碳年代,包括莫诺湖/Laschamp远足间隔。初步的古地磁结果表明,莫诺湖远足和较老的拉尚远足都存在于这两个记录的年龄与以前的估计是一致的。新的古地磁记录将结合以前发表的远场古地磁记录的Mono湖/Laschamp远足间隔从北冰洋,北大西洋,菲律宾群岛,智利沿海边缘,以定义与Mono湖远足全球场变化的时空模式。这些数据还将用于建立一系列低阶球谐模型,以定量描述全球范围内的变异模式。这种观测需要测试的概念地磁场的时间尺度的变化,起源和性质的偏移,以及它们的关系dynamobehavior.This研究是使用一个高中生,南加州大学的研究生,博士后研究员进行测量,并在数据分析的帮助。最后的古地磁数据集和球谐分析将在PI的网站上提供(http://earth.usc.edu/pageslund),并转发给其他数据库倡议。

项目成果

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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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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
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    $ 15.5万
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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
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    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
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    $ 15.5万
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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
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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
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  • 批准号:
    0129160
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    2002
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    $ 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:
    0130528
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  • 批准号:
    0129174
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  • 资助金额:
    $ 15.5万
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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
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    1999
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