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PALEOMAGNETISM NEAR THE NORTH MAGNETIC POLE

机译:北部磁极附近的古磁性

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摘要

Along with the dramatic decrease in global geomagnetic field intensity, recent observations demonstrate that the geomagnetic field in the Arctic has dramatically changed over the last century. This change is best illustrated by the recent migration of the North Magnetic Pole (which has been in the Canadian Arctic for the last 400 years) into the Arctic Ocean. Because historical records are short, paleomagnetic studies are needed to put these recent Arctic geomagnetic changes into a proper temporal context. This paper presents an overview of Arctic geomagnetism, paleomagnetism, and recent efforts to move our understanding forward by looking at recent or emerging high-resolution Holocene records from the Low and the High Arctic. These paleomagnetic records attest to the unique nature of the geomagnetic field in the High Arctic. They also highlight how the Arctic, and especially the High Arctic, is a unique vantage point for studying geodynamo processes associated with the tangent cylinder model ot convective flow within Earth's core that could lead to differences in the behavior of the geomagnetic field observed at Earths surface, and possible relationships to paleomagnetic secular variations at mid latitudes.
机译:随着全球地磁场强度的急剧下降,最近的观察表明,北极的地磁场在上个世纪已发生了巨大变化。最近发生的北极磁极(最近400年来一直在加拿大北极地区)迁移到北冰洋便可以很好地说明这一变化。由于历史记录很短,因此需要进行古磁研究,以将这些最近的北极地磁变化置于适当的时间范围内。本文概述了北极地磁,古地磁学以及最近通过从低北极和高北极获得的高分辨率的全新世记录来推动我们的理解向前发展。这些古磁记录证明了高北极地区地磁场的独特性质。他们还强调了北极,尤其是高北极地区如何成为研究与地心内对流流动的切线圆柱体模型相关的地球动力学过程的独特优势,这可能导致在地球表面观测到的地磁场行为发生差异,以及与中纬度古地磁长期变化的可能关系。

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  • 来源
    《Oceanography》 |2011年第3期|p.42-50|共9页
  • 作者单位

    Research Chair in Marine Geology, Institut des sciences de la mer de Rimouski (ISMER), and CEOTOP, Universite du Quebec a Rimouski, Rimouski, QC, Canada;

    College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA;

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