1600—2000年地球主磁场的全球变化

doi:10.11867/j.issn.1001-8166.2002.03.0339

地球科学进展 ›› 2002, Vol. 17 ›› Issue (3): 339 -343. doi: 10.11867/j.issn.1001-8166.2002.03.0339

康国发，吴小平，胡家富

云南大学地球科学系，云南昆明 650091

收稿日期:2002-06-03 修回日期:2001-11-05 出版日期:2002-12-20
通讯作者: 康国发（1956-），男，云南腾冲人，副教授，主要从事地磁与地震关系方面的研究.E-mail:wmomockb@public.km.yn.cn E-mail:wmomockb@public.km.yn.cn
基金资助:
云南省教委科研基金项目“地磁长期变化与日长变化和地震时空分布关系的研究”（编号：0012079）资助.

GLOBAL CHANGES OF THE GEOMAGNETIC FIELD DURING 1600—2000AD

KANG Guo-fa, WU Xiao-pin, HU Jia-fu

Department of Earth Science, Yunnan University,Kunming 650091,China

Received:2002-06-03 Revised:2001-11-05 Online:2002-12-20 Published:2002-06-01

下载PDF ( 1550 )

根据汤普森（Thompson）地磁场模型和第 8代IGRF模型，计算了1600-2000年期间的偶极子磁场、非偶极子磁场、西向漂移和地磁功率谱等反映主磁场变化的主要参数，分析了各个参数的长期变化特征。主要结果是：400年来地磁场的偶极子磁矩持续减小，1800年以来磁心的位置快速离开地心向太平洋方向移动了291km；西向漂移有大约30年左右的周期；非偶极子磁场异常中，南大西洋正磁异常、非洲负磁异常和大洋洲负磁异常是1600年以来一直存在的 3个大型磁异常，东亚正磁异常和北美正磁异常是1700年后逐渐形成的，17世纪北太平洋地区存在强的正磁异常。

关键词: 地磁场模型, 偶极子和非偶极子磁场, 西向漂移, 地磁功率谱, 全球变化

Based on Thompson and Barraclough magnetic field models and the eighth generation of International Reference Field (IGRF), the main parameters of main magnetic field for the dipole magnetic field, the non-dipole magnetic field, westward drift and geomagnetic spatial power spectrum were calculated and analyzed. The secular variations of each parameter were analyzed. The magnetic moment of magnetic dipole has been connectively decreasing since 1600. Magnetic center has departed the Earth's center quickly and moved 291km toward northern Pacific since 1800. There is an approximate-30-years periodicity for westward drift. The distribution range is very large, and the intensities are very strong, and the changes are connective for the following 3 non-dipole magnetic anomaly since 1600: Southern Atlantic positive anomaly, African negative anomaly and oceania negative anomaly. Eastern Asian positive anomaly and Northern American positive anomaly are non-dipole magnetic anomaly formed gradually after 1700. There is a very strong positive anomaly in the Northern Pacific during the 17th century. 

Key words: Geomagnetic reference field models, Dipole and non-dipole magnetic field, Westward drift, Geomagnetic field spatial power spectrum.

中图分类号:

P318

［1］ International Association of Geomagnetism and Aeronomy(IAGA) Division Ⅴ,Working group 8.International Geomagnetic Reference Field 2000［J］. Geopys J Int,2000,141: 259-262.
［2］ Barraclough D R. Spherical harmonic analyses of the geomagnetic field for eight epochs between 1600 and 1910［J］. Geophys J R Astron Soc,1974,36:497-513.
［3］ Thompson R, Barraclough D R. Geomagnetic secular variation based on spherical and cross validation analyses of historical and archaeomagnetic data［J］. J Geomag Geoelectr, 1982,34:245-263.
［4］ Fraser-Smith A C. Centered and eccentric geomagnetic dipoles and their pole, 1600-1985［J］. Reviews of Geophysics, 1987,25(1):1-16.
［5］ Wei Zigamg, Xu Wenyao.Westward drift of the geomagnetic anomaly in east Asia［J］. Chinese J Geophys,2000,43(1):45-52. ［魏自刚, 徐文耀.东亚大陆磁异常的西向漂移［J］.地球物理学报,2000,43(1):45-52.］
［6］ Yukutake T. The westward drift of the magnetic field of the Earth［J］.Bull Earthquake Res Inst,1962,40:1-165.
［7］ Kang Guofa, Hu Jiafu, Zhai Yingtian，et al. Global changes of the geomagnetic westward drift since 1900［J］. Journal of Yunnan University,2000,22(4):297-301.［康国发,胡家富,翟应田,等.1900年以来地磁场西向漂移的全球特征［J］.云南大学学报,2000,22(4):297-301.］
［8］ Richmond A D. Relation of the westward drift of the geomagnetic field to the rotation of the Earth's core［J］. J Geophys Res,1969,74:3 013-3 018.
［9］ Xu Wenyao,Wei Zigang. On westward drift of the Earth's magnetic field［J］. Prog Geophys,1999,21(4):45-57.［徐文耀,魏自刚. 地球磁场的西向漂移［J］.地球物理学进展,1999,14(2):44-57.］
［10］ Meyer J. Remark on the secular change in the energy density spectrum of the geomagnetic field［J］. J Geomag Geoelectr, 1986,38:165-169.
［11］ Nevanlinna H. Notes on global mean-square values of the geomagnetic field and secular variation［J］. J Geomag Geoelectr, 1987,39:165-174.
［12］ Nevanlinna H. On the drifting parts in the spatial power spectrum of geomagnetic secular variation［J］. J Geomag Geoelectr, 1987,39:367-376.
［13］ An Zhenchang, Wang Yuehua. Globle changes of the non-dipole magnetic fields for 1900-2000［J］. Chinese J Geophys, 1999,42(2):169-177.［安振昌,王月华.1900-2000年非偶极子磁场的全球变化［J］.地球物理学报,1999,42(2):169-177.］
［14］ Xu Wenyao. Secular variations of the planetary-scale geomagnetic anomalies［J］. Chinese J Geophys, 2001,44(2):180-188.［徐文耀.行星尺度磁异常的长期变化［J］.地球物理学报,2001,44（2）:180-188.］
［15］ Lin Yunfang, Zeng Xiaopin, Guo Qihua. Analysis of secular variation of non-dipole geomagnetic field in East Asia［J］. Chinese J Geophys,1985,28(5):482-496.［林云芳,曾小平,郭启华.东亚地区地磁非偶极了场长期变化的分析［J］.地球物理学报,1985,28(5):482-496.］
［16］ Yukutake T. The geomagnetic non-dipole field in the Pacific［J］. J Geomag Geoelectr, 1993,45:1 441-1 453.
［17］ Hodder B M. Geomagnetic secular variation since 1901［J］. Geophys J R Astr Soc,1981,65:763-776.
［18］ Xu Wenyao, Wei Zigamg,Ma Shizhuang. Dramtic variations in the Earth's main magnetic field during the 20th century［J］.Chinese Sci Bull,2000,45(14):1 563-1 566.［徐文耀,魏自刚,马石庄.20世纪地磁场的剧烈变化［J］.科学通报,2000,45(14):1 563-1 566.］
［19］ Coe R S, Grommr S, Mankinen A. Geomagnetic paleointensities from radiocarbon-dated lava flows on Hawaii and the question of the Pacific non-dipole low［J］. J Geophys Res,1978,83:1 740-1 756.

[1]	曲建升, 肖仙桃, 曾静静. 国际气候变化科学百年研究态势分析 ^*[J]. 地球科学进展, 2018, 33(11): 1193-1202.
[2]	史培军, 王爱慧, 孙福宝, 李宁, 叶涛, 徐伟, 王静爱, 杨建平, 周洪建. 全球变化人口与经济系统风险形成机制及评估研究[J]. 地球科学进展, 2016, 31(8): 775-781.
[3]	吴炳方, 邢强. 遥感的科学推动作用与重点应用领域[J]. 地球科学进展, 2015, 30(7): 751-762.
[4]	黄邦钦, 柳欣. 边缘海浮游生态系统对生物泵的调控作用[J]. 地球科学进展, 2015, 30(3): 385-395.
[5]	艾丽坤, 王晓毅. 全球变化研究中自然科学和社会科学协同方法的探讨[J]. 地球科学进展, 2015, 30(11): 1278-1286.
[6]	房启飞, 张虎权. 地球系统变化对叠层石衰减影响的研究综述[J]. 地球科学进展, 2014, 29(9): 1003-1010.
[7]	魏学琼, 叶瑜, 崔玉娟, 李蓓蓓, 袁存, 方修琦. 中国历史土地覆被变化重建研究进展[J]. 地球科学进展, 2014, 29(9): 1037-1045.
[8]	刘贤赵, 张勇, 宿庆, 田艳林, 全斌, 王国安. 现代陆生植物碳同位素组成对气候变化的响应研究进展[J]. 地球科学进展, 2014, 29(12): 1341-1354.
[9]	史培军, 孔锋, 叶谦, 汪明, 刘凯. 灾害风险科学发展与科技减灾[J]. 地球科学进展, 2014, 29(11): 1205-1211.
[10]	汪品先. 对地球系统科学的理解与误解——献给第三届地球系统科学大会[J]. 地球科学进展, 2014, 29(11): 1277-1279.
[11]	WuGuoxiong,LinHai,ZouXiaolei,LiuBoqi,HeBian. 全球气候变化研究与科学数据[J]. 地球科学进展, 2014, 29(1): 15-22.
[12]	周广胜，何奇瑾. 生态系统响应全球变化的陆地样带研究[J]. 地球科学进展, 2012, 27(5): 563-572.
[13]	张俊辉，夏敦胜，张英，刘宇航. 中国泥炭记录末次冰消期以来古气候研究进展[J]. 地球科学进展, 2012, 27(1): 42-51.
[14]	曾庆存,林朝晖. 地球系统动力学模式和模拟研究的进展[J]. 地球科学进展, 2010, 25(1): 1-6.
[15]	崔胜辉,李方一,黄静,于裕贤. 全球变化背景下的敏感性研究综述[J]. 地球科学进展, 2009, 24(9): 1033-1041.

阅读次数

全文

摘要