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
• 负责人: Robert Negrini
• 金额: $ 18.34万
• 依托单位: California State University-Bakersfield
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0911351&HistoricalAwards=false
• 关键词: RUI; Laschamp; Mono; Lake; Excursions

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The focus of this project is the recovery of a high-fidelity record of the Earth's magnetic field from ~60,000 to 20,00 years ago. Such records are essential toward a better understanding of the unusually unstable and weak field characterizing this time period. In particular they are necessary to test the proposed geographic distribution, cause, and very existence of two magnetic "excursions" (extreme departures of the magnetic field from its normal state) that likely occurred approximately 41,000 and 34,000 years ago. Because this unusual magnetic field behavior is in principle recorded simultaneously in both marine and nonmarine environments, it can be used as an independent dating method for comparing paleoclimate events from both environments thus leading to confirmation or invalidation of proposed climate connections between the oceans, continents, and atmosphere. Furthermore, because the strength of the magnetic field impacts the production of radiocarbon in the atmosphere, a better understanding of the magnetic field can lead to improved calibrations of radiocarbon dates, the type of corrections that recently resulted in revising our knowledge of interactions between Neanderthals and humans between 40,000 and 30,000 years ago. The research also investigates the usefulness of a lake-level (hence, climate) indicator based on varying magnetic mineral concentration in response to changing lake chemistry with lake depth. The scientific goals of the proposed research are the following: 1) test the hypothesis that the Laschamp and Mono Lake Excursions were separate geomagnetic events that occurred ~40,000 and 34,000 years ago, respectively, 2) constrain the spatial and temporal limits of these records as chronostratigraphic signals and as data for testing geomagnetic field models, and 3) test models of titanomagnetite concentration as an indicator of lake-level change. Several undergraduates and one or two Masters-level graduate students will be substantively engaged in this research. Because CSUB is a teaching university with Hispanic Serving Institution status, both sets of students will be recruited from an ethnically diverse population that is underrepresented in the science disciplines; thus, the project will broaden participation of underrepresented groups in the earth sciences. All of the students will have the opportunity to work at a collaborative, Tier 1 research university for part of their research and/or to present their research at meetings of major scientific societies. The core materials will be rich in paleoclimate indicators thereby fostering future projects for up to a dozen students as part of senior research projects required of all CSUB seniors. Finally, hundreds of general education students and teachers in training will be given updates on this research through lectures and lab exercises by both principal investigators.

该奖项是根据2009年的《美国回收与再投资法》（公法111-5）资助的。该项目的重点是恢复地球磁场的高保真记录从〜60,000到20,00年前。这样的记录对于更好地理解这一时期的异常不稳定和薄弱的领域至关重要。特别是对于测试了两个磁性“偏移”（磁场与正常状态的极端出发），这是必要的，可能发生在大约41,000年前和34，000年前。由于这种异常的磁场行为原则上是在海洋和非海洋环境中同时记录的，因此它可以用作一种独立的约会方法，用于比较两种环境中的古气候事件，从而导致海洋，大陆和气氛之间提出的气候联系的确认或无效。此外，由于磁场的强度会影响大气中放射性碳的产生，因此对磁场的更好理解可以改善放射性碳日期的校准，这种校正的类型最近导致我们对尼安德特人与40,000至30,000至30,000至30,000至30,000至30,000至30,000至30，000年前的相互作用的了解。该研究还研究了湖泊水平（因此，气候）指标的有用性，基于磁性矿物质浓度的变化，响应着随着湖泊深度而变化的湖泊化学反应。拟议的研究的科学目标是：1）测试以下假设：拉松和单湖偏移是单独的地磁事件，分别发生了〜40,000和34，000年前发生的〜40,000和34,000年，2）约束这些记录的空间和时间限制，作为Chronotatationition testery fielt titer模型，以及3）模型的数据，并将其作为数据的图指标，以及3）模型。湖泊的变化。几名大学生和一两个硕士学位的研究生将实质上从事这项研究。由于CSUB是一所具有西班牙裔服务机构地位的教学大学，因此这两组学生将是从科学学科中人数不足的种族多样化人群中招募的。因此，该项目将扩大代表性不足的群体在地球科学中的参与。所有的学生都将有机会在协作的1级研究Insperiess进行一部分研究和/或在主要科学社会会议上介绍他们的研究。核心材料将富含古气候指标，从而为所有CSUB老年人所需的高级研究项目的一部分促进了多达十几个学生的未来项目。最后，两位主要研究人员将通过讲座和实验室练习对数百名普通教育学生和培训中的教师进行有关这项研究的最新信息。