Regional magnetic anomaly fields 3D Taylor polynomial and surface spline models
Regional magnetic anomaly fields 3D Taylor polynomial and surface spline models
复制标题
区域磁异常场 3D 泰勒多项式和表面样条模型
DOI：
10.1007/s11770-016-0533-5
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发表时间：
2016
影响因子：
0.7
通讯作者：
Li Xiu-Ming
中科院分区：
文献类型：
--
作者：
FengYan;JiangYong;Jiang Yi;Li Zheng;Jiang Jin;Liu Zhong-Wei;Ye Mei-Chen;Wang Hong-Sheng;Li Xiu-Ming
We used data from 1960.0, 1970.0, 1980.0, 1990.0, and 2000.0 to study the.geomagnetic anomaly fi eld over the Chinese mainland by using the three-dimensional Taylor.polynomial (3DTP) and the surface spline (SS) models. To obtain the pure anomaly fi eld, the.main fi eld and the induced fi eld of the ionospheric and magnetospheric fi elds were removed.from measured data. We also compared the SS model anomalies and the data obtained.with Kriging interpolation (KI). The geomagnetic anomaly distribution over the mainland.was analyzed based on the SS and 3DTP models by transferring all points from 1960.0−.1990.0 to 2000.0. The results suggest that the total intensity F anomalies estimated based.on the SS and KI for each year are basically consistent in distribution and intensity. The.anomalous distributions in the X-, Y-, and Z-direction and F are mainly negative. The 3DTP.model anomalies suggest that the intensity in the X-direction increases from −100 nT to 0 nT.with longitude, whereas the intensity in the Y-direction decreases from 400 nT to 20 nT with.longitude and over the eastern mainland is almost negative. The intensity in the Z-direction.and F are very similar and in most areas it is about −50nT and higher in western Tibet. The SS.model anomalies overall refl ect the actual distribution of the magnetic fi eld anomalies; however,.because of the uneven distribution of measurements, it yields several big anomalies. Owing to.the added altitude term, the 3DTP model offers higher precision and is consistent with KI.
