IGRF12和WMM2015模型在中国区域的精度评估及其适用性分析  

Accuracy Evaluation and Applicability of IGRF12 and WMM2015 Model in Chinese Mainland

作　　者：聂琳娟[1,2] 邱耀东 申文斌[1,3] 张素琴[4] 张兵兵[1] NIE Linjuan QIU Yaodong SHEN Wenbin ZHANG Suqin(School of Geodesy and Geomatics, Wuhan University,Wuhan 430079 ZHANG Bingbing＇ China Hubei Water Resources Technical College, Wuhan 430070, China Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China Institute of Geophysics, China Earthquake Administration, Beijing 100081, China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]湖北水利水电职业技术学院,湖北武汉430070 [3]武汉大学地球空间环境与大地测量教育部重点实验室,湖北武汉430079 [4]中国地震局地球物理研究所,北京100081

出　　处：《武汉大学学报（信息科学版）》2017年第9期1229-1235,1291,共8页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41274032;41474018)~~

摘　　要：利用中国大陆区域35个地磁基准台站2008~2015年的观测数据,结合高精度的地壳磁场模型NGDC-720,计算各台站观测值和地磁场模型值7个要素之间的差值。通过引入均方根误差,评估最新的国际地磁参考场模型IGRF12和世界地磁模型WMM2015在中国区域的精度及其适用性。结果表明,IGRF12模型与台站年均值的一致性吻合较好,但对于不同台站,IGRF12模型误差相差较大。WMM2015和IGRF12模型误差具有相似的空间分布特征,且地磁各要素差值的最大值、最小值和均方根误差十分接近,其中地磁偏角和总磁场强度的均方根误差优于16′和100nT。因此,在研究中国区域地磁异常时,IGRF12或WMM2015模型均可作为主磁场改正的参考背景场。In this paper, we calculate the differences of a geomagnetic field between observatories and the main magnetic field by using NGDC-720 model and observed data collected at 36 stations from 2008 to 2015 in the Chinese mainland area. The accuracy and applicability of the IGRF12 and WMM2015 models were evaluated with the RMSE. The results suggest that：the IGRF12 model is in good agreement with the annual mean value of geomagnetic observatories~ but for different stations, the precision of IGRF12 model presents a huge difference. The model error in IGRF12 and WMM2015 have similar spatial distribution characteristics, and the maximum, minimum, and as root mean of magnetic elements are very close to one another. The RMSE of declination and the total magnetic field were 16＇and 124.96 nT. Therefore, in studies of regional geomagnetic anomalies, regardless of the IGRF12 or WMM2015 as main magnetic field, both are feasible.

关 键 词：IGRF12 WMM2015 NGDC-720 均方根误差 

分 类 号：P318[天文地球—固体地球物理学]