Rapid regional perturbations to the recent global geomagnetic decay revealed by a new Hawaiian record.
Rapid regional perturbations to the recent global geomagnetic decay revealed by a new Hawaiian record.
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DOI:
10.1038/ncomms3727
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发表时间:
2013
影响因子:
16.6
通讯作者:
Herrero-Bervera E
中科院分区:
文献类型:
--
作者:
de Groot LV;Biggin AJ;Dekkers MJ;Langereis CG;Herrero-Bervera E
The dominant dipolar component of the Earth’s magnetic field has been steadily weakening for at least the last 170 years. Prior to these direct measurements, archaeomagnetic records show short periods of significantly elevated geomagnetic intensity. These striking phenomena are not captured by current field models and their relationship to the recent dipole decay is highly unclear. Here we apply a novel multi-method archaeomagnetic approach to produce a new high-quality record of geomagnetic intensity variations for Hawaii, a crucial locality in the central Pacific. It reveals a short period of high intensity occurring ~1,000 years ago, qualitatively similar to behaviour observed 200 years earlier in Europe and 500 years later in Mesoamerica. We combine these records with one from Japan to produce a coherent picture that includes the dipole decaying steadily over the last millennium. Strong, regional, short-term intensity perturbations are superimposed on this global trend; their asynchronicity necessitates a highly non-dipolar nature. The Earth’s geomagnetic field has weakened in recent centuries, leading to calls for historic reconstructions; however, records are sparse and unevenly distributed. de Groot et al. provide a new, high-quality record from Hawaiian lavas, revealing crucial insights into past geomagnetic field fluctuations.
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影响因子:
--
作者:
COE, RS;GROMME, S;MANKINEN, EA
通讯作者:
MANKINEN, EA
DOI:
10.1098/rsta.2000.0569
发表时间:
2000-03-15
期刊:
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
影响因子:
--
作者:
Jackson, A;Jonkers, ART;Walker, MR
通讯作者:
Walker, MR
影响因子:
3.5
作者:
Donadini, F.;Korte, M.;Constable, C. G.
通讯作者:
Constable, C. G.
影响因子:
3.5
作者:
Korhonen, K.;Donadini, F.;Pesonen, L. J.
通讯作者:
Pesonen, L. J.
影响因子:
3.9
作者:
MANKINEN, EA;CHAMPION, DE
通讯作者:
CHAMPION, DE