Geomagnetic paleointensity variation with a 100 kyr quasi-period
Geomagnetic paleointensity variation with a 100 kyr quasi-period
复制标题
100 kyr准周期的地磁古强度变化
DOI：
10.1016/s0012-821x(00)00199-0
复制
发表时间：
2000
影响因子：
5.3
通讯作者：
T. Yamazaki
中科院分区：
文献类型：
--
作者：
Y. Yokoyama;T. Yamazaki
我们分析了太平洋广大地区5个沉积物岩心近700年来的地磁场强度（古强度）记录。利用小波变换成功提取了准周期为100kyr的全球古强度变化。由于这种变化与沉积物的磁性不相关，因此它是由地磁场的变化引起的。100 kyr的地磁场准周期与偏心率（地球轨道要素之一）和晚第四纪古气候冰期-间冰期旋回的时间尺度接近。特别是地磁场强度的变化与气候之间存在着18 kyr的时滞相关性。虽然地球发电机被广泛认为是一个自我维持的系统，但我们的研究结果支持了通过轨道强迫或气候变化提供外部能量的可能性。
We analyzed records of geomagnetic field intensity (paleointensity) during the last 700 kyr in five sediment cores from a wide region of the Pacific Ocean. A global paleointensity variation with a 100 kyr quasi-period was successfully extracted using the wavelet transform. Because the variation does not correlate with that of magnetic properties of the sediments, it originated from a change in the geomagnetic field. The 100 kyr quasi-period of the geomagnetic field is close to the timescales of eccentricity, one of the Earth’s orbital elements, and of the glacial–interglacial cycle of the late Quaternary paleoclimate. In particular, there is a correlation between the variations of the geomagnetic field intensity and climate with an 18 kyr time lag. While the geodynamo has widely been thought to be a self-sustained system, our results support the possibility of an external energy supply of the variation through orbital forcing or climate change.
地磁变化和轨道参数-与全球气候的关系。
DOI：
--
发表时间：
2004
期刊：
CHIKYUU-Special publication, "Deep-sea drilling and new geobiology vol 4
影响因子：
--
作者：
Yamazaki;T.;Kanamatsu;T.;Oda;H.
通讯作者：
H.