Magnetic flux expulsion from the core as a possible cause of the unusually large acceleration of the north magnetic pole during the 1990s

被引:23
作者
Chulliat, A. [1 ]
Hulot, G. [1 ]
Newitt, L. R. [2 ]
机构
[1] Univ Paris Diderot, INSU, CNRS, Inst Phys Globe Paris,Equipe Geomagnetisme, F-75005 Paris, France
[2] Boreal Language & Sci Serv, Ottawa, ON K2B 8E1, Canada
关键词
GEOMAGNETIC SECULAR VARIATION; GEOSTROPHIC FLOW; FIELD; MODELS; DECADE; JERK; TOP;
D O I
10.1029/2009JB007143
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The north magnetic pole (NMP) has been drifting in a north-northwesterly direction since the 19th century. Both local surveys and geomagnetic models derived from observatory and satellite data show that the NMP suddenly accelerated during the 1990s. Its speed increased from about 15 km/yr in 1989 to about 60 km/yr in 2002, after which it started to decrease slightly. Using a Green's function, we show that this acceleration is mainly caused by a large, negative secular variation change in the radial magnetic field at the core surface, under the New Siberian Islands. This change occurs in a region of the core surface where there is a pair of secular variation patches of opposite polarities, which we suggest could be the signature of a so-called "polar magnetic upwelling" of the type observed in some recent numerical dynamo simulations. Indeed, a local analysis of the radial secular variation and magnetic field gradient suggests that the secular variation change under the New Siberian Islands is likely to be accompanied by a significant amount of magnetic diffusion, in agreement with such a mechanism. We thus hypothesize that the negative secular variation change under the New Siberian Islands that produced the NMP acceleration could result from a slowdown of the polar magnetic upwelling during the 1990s. We finally note that the NMP drift speed is determined by such a combination of factors that it is at present not possible to forecast its future evolution.
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页数:12
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