The Iron Age Geomagnetic Field

铁器时代的地磁场

• 批准号: 1141840
• 负责人: Lisa Tauxe
• 金额: $ 36.63万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1141840&HistoricalAwards=false
• 关键词: Iron; Age; Geomagnetic; Field; Iron; Age; Geomagnetic; Field

The interplay between archaeology and the study of the Earth's ancient magnetic field goes back to the late 19th century when physicists realized that ceramics and other archeological materials could retain a record of the ancient magnetic field. Ceramic materials were among the very first targets of modern experimental methods to determine the ancient field strength and the field known as "archaeomagnetism" remains vibrant today. Archaeologists are beginning to take advantage of the powerful constraints on ages of material for which full magnetic vectors are possible in regions with an accurate reference model and geomagnetists are taking advantage of the growing archeomagnetic data base which is producing more high quality data with better age constraints. However, partly owing to the experimental difficulties in recovering ancient magnetic field strength from geological and archaeological materials and partly because of a lack of well-dated materials for study, the archaeomagnetic data base remains heavily biased towards European data from the last millennia. This grant will support efforts to expand the global data set over the last four millennia, including new radiocarbon age control and new paleomagnetic and archaeomagnetic data from places that are currently under-sampled. The research supported here will have implications for numerical simulations of the geomagnetic field, and provide higher resolution age constraints for archaeological research. An accurate picture of paleointensity changes on a global scale (a goal to which this project contributes but does not solve by itself) is essential for understanding variations in the production of radiocarbon and the calibration of the radiocarbon time scale. Finally, this proposal will help support the continued development of online paleomagnetic teaching materials in the form of the Essentials of Paleomagnetism online textbook project of the PI (see http://magician.ucsd.edu/Essentials) and facilitate offering of online classes in paleomagnetism offered to graduate students the world over.

考古学与对地球古代磁场的研究之间的相互作用可以追溯到19世纪后期，当时物理学家意识到陶瓷和其他考古材料可以保留古代磁场的记录。陶瓷材料是确定古代田间强度的现代实验方法的第一个目标之一，如今被称为“考古磁性”的领域仍然充满活力。 考古学家开始利用具有准确参考模型的区域中完全磁性向量的材料年龄的强大限制，而GeoMagnetists则利用了不断增长的考古磁数据库，该数据库正在产生具有更好年龄约束的高质量数据。 然而，部分原因是由于从地质和考古材料中恢复古代磁场强度的实验困难，部分原因是由于缺乏良好的研究材料，考古磁数据库仍然对上一千年的欧洲数据持巨大偏见。 该赠款将支持在过去的四千年中扩大全球数据集的努力，包括新的放射性碳年龄控制以及目前采样不足的地方的新的古磁和考古磁数据。 这里支持的研究将对地磁领域的数值模拟产生影响，并为考古研究提供更高的分辨率年龄限制。对全球尺度上的紫色变化的准确图片（该项目贡献但本身并不解决的目标）对于理解放射性碳的生产和放射性碳时间量表的校准至关重要。 最后，该提案将有助于以PI的古磁性在线教科书项目的形式继续开发在线古磁教材的持续开发（请参阅http://magician.ucsd.edu/essentials），并促进为毕业的学生提供毕业生。