| 2000年中国地区地磁场长期变化的区域特征 |
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| 引用本文： | 徐文耀,魏自刚,夏国辉.2000年中国地区地磁场长期变化的区域特征[J].地球物理学报,2005,48(3):551-560. |
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| 作者姓名： | 徐文耀 魏自刚 夏国辉 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京,100029;中国科学院地质与地球物理研究所,北京,100029;中国科学院地质与地球物理研究所,北京,100029 |
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| 基金项目： | 国家自然科学基金项目 (4 0 43 60 16)资助 |
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| 摘 要： | 本文用中国地磁场复测点和地磁台站资料，建立了2000年代中国参考地磁场长期变化模型CGRF-SV2000.模型显示，中国地区地磁场变化比较平缓，X、Y、Z、H、D、I、F七个地磁要素的“无符号平均年变率”分别为122 nT/a、82 nT/a、438 nT/a、118 nT/a、096(′)/a、299(′)/a、224 nT/a，比国际参考地磁场IGRF给出的全球年变率约小1/3到1/2.各地磁要素的变化显示，地磁北极正在向中国移近，或者说，中国正在向高地磁纬度方向移动，平均移动速度约为3(′)/a.磁偏角变化还显示，中国地区东西部偏角差异继续扩大.作为检验和对比研究，本文利用第8代国际参考地磁场（IGRF）模型，分析了全球地磁场长期变化的时空特征，讨论了全球长期变模型IGRF_SV与中国长期变模型CGRF_SV的异同点.对比分析表明，中国地区地磁场的长期变化与全球长期变化总趋势基本符合，但是，CGRF_SV也表现出一些特有的局部异常特征.
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| 关 键 词： | 地磁图 主磁场 地磁场长期变化 国际参考地磁场 IGRF 中国参考地磁场 CGRF |
| 文章编号： | 0001-5733(2005)03-0551-10 |
| 收稿时间： | 2004-08-23 |
| 修稿时间： | 2005-01-08 |
Regional features of the secular variation of the geomagnetic field in China for 2000 |
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| XU Wen-Yao,WEI Zi-Gang,Xia Guo-hui.Regional features of the secular variation of the geomagnetic field in China for 2000[J].Chinese Journal of Geophysics,2005,48(3):551-560. |
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| Authors: | XU Wen-Yao WEI Zi-Gang Xia Guo-hui |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | On the basis of magnetic survey data during 1998 2001, the China Geomagnetic Reference Field Secular Variation model for 2000, CGRF SV2000, is established. The model shows a slow and smooth variation of the magnetic field in China. The unsigned average annual rates are 122 nT/a, 82 nT/a, 43 8 nT/a, 118 nT/a, 096(′)/a, 299(′)/a and 224 nT/a for X, Y, Z, H, D, I and F, respectively. These rates are less than the global rates of IGRF by 1/2 to 1/3 The variations of different elements show an unified SV pattern in China: the north geomagnetic pole is moving to China, or China is moving toward high latitudes at a rate 3(′)/a. In addition, the variation of declination D shows that the contrast of D between eastern and western China is enhanced. As a comparison and test, The 8th generation of te International Geomagnetic Reference Field (IGRF) model is used to analyze the secular change of the global geomagnetic field. The global SV estimated by the IGRF model shows similar characteristics compared with CGRF SV2000, although the annual rates of IGRF SV are greater than those of CGRF SV, and some regional (or local) anomalies are noted. |
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| Keywords: | Magnetic charts Main geomagnetic field Secular variation of the geomagnetic field International Geomagnetic Reference Field (IGRF) China Geomagnetic Reference Field (CGRF) |
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