We used data from 1960.0,1970.0,1980.0,1990.0,and 2000.0 to study the geomagnetic anomaly field over the Chinese mainland by using the three-dimensional Taylor polynomial（3DTP） and the surface spline（SS） *** obtai...
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We used data from 1960.0,1970.0,1980.0,1990.0,and 2000.0 to study the geomagnetic anomaly field over the Chinese mainland by using the three-dimensional Taylor polynomial（3DTP） and the surface spline（SS） *** obtain the pure anomaly field,the main field and the induced field of the ionospheric and magnetospheric fields were removed from measured *** 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 *** results suggest that the total intensity F anomalies estimated based on the SS and KI for each year are basically consistent in distribution and *** anomalous distributions in the X-,Y-,and Z-direction and F are mainly *** 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 *** intensity in the Z-direction and F are very similar and in most areas it is about-50 nT and higher in western *** SS model anomalies overall reflect the actual distribution of the magnetic field anomalies;however,because of the uneven distribution of measurements,it yields several big *** to the added altitude term,the 3DTP model offers higher precision and is consistent with KI.
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