Regional characteristics analysis in China based on the 13th International Geomagnetic Reference Model
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摘要:
根据最新的第十三代国际地磁参考场模型（IGRF13），计算了2015—2020年中国区域地磁场模型七要素长期变化速率，并在此基础上分析我国区域地磁场长期变化特征。通过分析计算我国28个地磁台的IGRF13模型值与实际地磁场的长期变化速率、差值及均方误差，结果显示：IGRF13模型所显示的地磁场长期变化与我国区域地磁场实际观测变化基本一致，但在局部区域也存在差异，IGRF13模型能够体现中国区域地磁场的特征。应用IGRF13模型数据时需要考虑局部区域与台站实际观测数据的误差。
Abstract:Based on the latest 13th International Geomagnetic Reference （IGRF13） Model, the long-term change rates of the seven elements of the regional geomagnetic model in China from 2015 to 2020 were calculated to analyze the long-term change characteristics of the geomagnetic field in China. By analyzing and calculating the long change rate, difference and mean square error between IGRF13 model values and the actual geomagnetic field of 28 geomagnetic stations in China, the results show that: The long-term variation of geomagnetic field shown by IGRF13 model is basically consistent with the actual observed variation of geomagnetic field in China, but there are also obvious differences. IGRF13 model can reflect the characteristics of geomagnetic field in China. When applying IGRF13 model data, the error between local area and actual observation data of the station should also be considered.
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图 1 2015—2020年中国地区IGRF13模型七要素等变线分布图
（a） 磁偏角D；（b） 磁倾角I；（c） 水平分量H；（d） 北向分量X；（e） 东向分量Y；（f） 垂直分量Z；（g） 地磁场总强度F
Figure 1. Distribution map of isometric lines of seven elements of IGRF13 model values in China during 2015−2020
（a） Magnetic declination D；（b） Magnetic dip I；（c） Horizontal component H；（d） North component X； （e） East component Y；（f） Vertical component Z；（g） Geomagnetic field total intensity F
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图 2 2015—2020年地磁场总强度F的IGRF13模型值与台站观测值长期年变速率
Figure 2. IGRF13 model value of total intensity of geomagnetic field F and long-term annual variation rate of observed values at the station during 2015−2020
表 1 2015—2020年地磁场七要素IGRF13模型值与观测值的差值及均方误差
Table 1 Difference between model values of IGRF13 and observed values and mean square error for seven elements of the geomagnetic field during 2015−2020
台站名称 D/′ I/′ H/nT F/nT X/nT Y/nT Z/nT MZL 1.2 −2.4 172 370 171 −21 330 DED 17.5 9.3 −72 134 −64 116 169 CNH −3.7 16.3 −188 91 −190 6 202 WMQ −2.4 −26.6 301 −236 302 −1 −401 HHH −3.9 −7.4 1 −210 −2 −31 −242 JYG −1.2 −2.2 −17 −96 −17 −9 −102 CHL 9.4 0.1 81 157 90 66 134 KSH −12.6 −12.0 90 −143 97 −93 −218 DLG 11.5 −49.3 437 −385 446 34 −736 JIH −2.6 −7.1 78 −31 75 −31 −85 TAY 3.1 2.0 −38 −31 −36 30 −12 LYH 13.5 0.4 77 147 89 109 126 GLM −1.3 14.5 −91 174 −91 −12 272 TAA −24.1 49.9 −600 33 −619 −151 474 LZH 0.5 4.7 −2 103 −2 4 127 ZZH −16.0 −3.8 4 −70 −8 −146 −90 TSY −8.5 7.5 −37 92 −41 −76 143 QIX −0.9 3.7 26 120 25 −10 131 COM −16.3 −6.2 −43 −161 −59 −152 −178 CDP −7.8 0.3 1 6 −2 −77 7 LSA 31.7 8.1 −256 −247 −254 319 −98 XIC 19.3 14.7 −205 −83 −199 208 96 SYG 1.3 −1.6 23 12 24 13 −8 QZH 1.8 −2.2 48 38 49 15 0 THJ 0.2 −13.0 26 −100 26 1 −202 GZH −6.4 9.5 −50 27 −53 −68 120 YON 1.1 1.6 −13 −1 −13 13 17 QGZ 3.8 0.0 −20 −23 −19 44 −12 平均值 0.3 0.3 −9.6 −11.2 −9.8 3.6 1.3 均方根差 11.5 16.3 178.9 156.6 182.4 100.7 236.0 
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