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Feng Yan, Sun Han, Jiang Yong, Mao Fei. 2013: Variation of the main magnetic field in Chinese mainland during 20th century. Acta Seismologica Sinica, 35(6): 865-875. DOI: 10.3969/j.issn.0253-3782.2013.06.01
Citation: Feng Yan, Sun Han, Jiang Yong, Mao Fei. 2013: Variation of the main magnetic field in Chinese mainland during 20th century. Acta Seismologica Sinica, 35(6): 865-875. DOI: 10.3969/j.issn.0253-3782.2013.06.01
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Variation of the main magnetic field in Chinese mainland during 20th century

  • 1.

    College of Mathematics and Statistics,Nanjing University of Information and Technology,Nanjing 210044,China

  • 2.

    Remote Sensing Application and Experiment Station of National Satellite Meteorological Center,Guangxi Meteorological Disaster Mitigation Institute,Nanning 530022,China

  • 3.

    Chinese Academy of Meteorological Sciences,Beijing 100081,China

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  • Received Date: September 08, 2012
  • Revised Date: July 06, 2013
  • Published Date: October 31, 2013
    Graphical Abstract
    • Abstract
  • In order to investigate the variation of main magnetic field in Chinese mainland during 20th century, the newest global modes, such as IGRF11, CALS3K. 4 (3K. 4) and GUFM1, were firstly adopted to calculate and analyze the mean values of annual rate of change (MAC) during 1900—1990. Combining the global mode, CM4, and regional model, Taylor polynomial (TY), we analyzed the distribution of annual rate of change (ARC) and MAC with interval of 10 years, based on survey data during 1960—2000, and then made a comparison with that of three global models. Results showed that the MACs are very close based on the models IGRF11, 3K. 4 and GUFM1 throughout the 20th century. These three models demonstrated the similar distribution of ARC in China during 1960—2000, which is resulted from the same modeling theory and closed truncation levels. The distributions of ARC based on global and TY models are basically consistent, that is, the X component of ARC decreases with years, and Y, Z, F firstly decrease and then increase. However, there were some tiny differences between global models and TY model, which is caused by the higher density of valid survey data and the usage of regional model. Results also showed that the MAC from TY model is consistent with that from CM4, indicating that the CM4 model is able to ideally reflect the variation of main magnetic field in Chinese mainland.
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