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The fourth generation of comprehensive model of geomagnetic field CM4 is a numerical model in which earths magnetic field can completely be divided into internal and external parts. In this paper we have calculated and plotted the grid values of internal and external fields of Chinese mainland in every 10 a from 1960 to 2000 by combining CM4 with Taylor polynomial model based on all survey data during 1960—2000, and made more efforts to analyze the whole distribution of crustal anomaly field. Results show that internal field value of northern component X decreased with time. The amplitude was about 750 nT in the period from 1960 to 2000, the trend of external field variation increased in 1960, then gradually decreased about 32 nT until 2000. The internal field value of eastern component Y decreased first, then continuously increased, and its intensities decreased about 40 nT from 1960 to 2000. The trend of external field variation was increased, decreased and increased as time went on, and the external field increased up to about 3.8 nT since 1960. The internal field value of vertical component Z was similar to that of Y, its intensities totally increased about 600 nT. The trend of external field variation decreased and then increased with time, amplitude of which was about 4.6 nT. As for anomalous field, the distributions of components X and Z, total intensity F, and horizontal component H were all negative, the intensities of X and H decreased with longitude while those of Z and F increased. The distributions of Y and declination D were very similar and both of them had positive values in west-central region of China. Their intensities decreased with longitude. The distribution of inclination I was mainly negative, and its intensity increased with longitude.
[1] Hulot G, Sabaka T J, Olsen N 2007 Treatise in Geophysics, Geomagnetism (Amsterdam: Elsevier) p33
[2] Wardinski I, Holme R 2006 J. Geophys. Res. 111 101
[3] Haines G V 1985 J. Geophys. Res. 90 2583
[4] Alldredge L R 1987 J. Geomag. Geoelectr. 39 723
[5] Maus S, Macmillan S, Chernova T, Choi S, Dater D, Golovkov V, Lesur V, Lowes F, Luhr H, Mai W, McLean S, Olsen N, Rother M, Sabaka T, Thomson A, Zvereva T 2005 Phys. Earth Planet Int. 151 320
[6] Xu W Y 2002 Sci. China D 32 576 (in Chinese)[徐文耀 2002 中国科学 D 32 576]
[7] Lesur V, Wardinski I, Rother M, Mandea M 2008 Geophys. J. Int. 173 382
[8] Olsen N, Mandea M 2008 Nature(Geosci.) 1 390
[9] Wegener A 1912 Geol. Rundsch. 3 276
[10] Vine F J, Matthews D H 1963 Nature 199 947
[11] Purucker M E 2007 Eos.Trans. AGU 88 263
[12] Regan R D, Cain J C, Davis W M 1975 J. Geophys. Res. 80 794
[13] An Z C, Xu Y F, Wang Y H 1992 Chin. J. Space Sci. 12 123 (in Chinese) [安振昌、 徐元芳、 王月华 1992 空间科学学报 12 123]
[14] Maus S, Rother M, Holme R, Luhr H, Olsen N, Haak V 2002 Geophys. Res. Lett. 29 1
[15] Hemant K, Maus S 2005 Phys. Earth Planet Int. 149 321
[16] Thebault E 2006 Earth Planets Space 58 485
[17] Hemant K, Thébault E, Mandea M, Ravat D, Maus S 2007 Earth Planet Sci. Lett. 260 56
[18] Xu W Y 2009 Physics of Electromagnetic Phenomena of the Earth (Hefei: University of Science and Technology of China Press) p100 (in Chinese) [徐文耀 2009 地球电磁现象物理学 (合肥:中国科学技术大学出版社) 第100页]
[19] Sabaka T J, Baldwin R T 1993 NASA/GSFC Contract Report (Maryland: NASA/GSFC) p760
[20] Langel R A, Sabaka T J, Baldwin R T, Conrad J A 1996 Phys. Earth Planet Int. 98 235
[21] Sabaka T J, Olsen N, Langel R A 2002 Geophys. J. Int. 151 32
[22] Sabaka T J, Olsen N, Purucker M E 2004 Geophys. J. Int. 159 521
[23] Backus G E 1986 Rev. Geophys. 24 75
[24] Maeda H, Iyemori T, Araki T, Kamei T 1982 Geophys. Res. Lett. 9 337
[25] Olsen N, Glassmeier K H, Jia X 2010 Space Sci. Rev. 152 1
[26] Maus S 2008 Geophys. J. Int. 174 135
[27] Maus S 2008 Geochem. Geophys. Geosyst. 9 1
[28] Torta J M, Gaya-Pique L R, Curto J J, Altadill D 2008 J. Atmos. Terr. Phys. 71 1497
[29] Maus S, Barckhausen U, Berkenbosch H, Bournas N, Brozena J, Childers V, Dostaler F, Fairhead J D, Finn C, von Frese R R B, Gaina C, Golynsky S, Kucks R, Luhr H, Milligan P, Mogren S, Muller R D, Olesen O, Pilkington M, Saltus R, Schreckenberger B, Thebault E, Caratori T F 2009 Geochem. Geophys. Geosyst. 10 1
[30] Hulot G, Olsen N, Thebault E, Hemant K 2009 Geophys. J. Int. 177 361
[31] Olsen N, Mandea M, Sabaka T J, Tffner-Clausen L 2009 Geophys. J. Int. 179 1477
[32] Zhang X D, Liu X, Zhao P D 2009 Acta Phys. Sin. 58 4415 (in Chinese) [张晓丹、 刘 翔、 赵品栋 2009 58 4415]
[33] Langel R A, Estes R H, Mead G D 1982 J. Geomag. Geoelectr. 34 327
[34] Ravat D N, Langel R A, Purucker M E, Arkani-Hamed J, Alsdorf D E 1995 J. Geophys. Res. 100 111
[35] Olsen N 1993 Ann. Geophys. 11 254
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[1] Hulot G, Sabaka T J, Olsen N 2007 Treatise in Geophysics, Geomagnetism (Amsterdam: Elsevier) p33
[2] Wardinski I, Holme R 2006 J. Geophys. Res. 111 101
[3] Haines G V 1985 J. Geophys. Res. 90 2583
[4] Alldredge L R 1987 J. Geomag. Geoelectr. 39 723
[5] Maus S, Macmillan S, Chernova T, Choi S, Dater D, Golovkov V, Lesur V, Lowes F, Luhr H, Mai W, McLean S, Olsen N, Rother M, Sabaka T, Thomson A, Zvereva T 2005 Phys. Earth Planet Int. 151 320
[6] Xu W Y 2002 Sci. China D 32 576 (in Chinese)[徐文耀 2002 中国科学 D 32 576]
[7] Lesur V, Wardinski I, Rother M, Mandea M 2008 Geophys. J. Int. 173 382
[8] Olsen N, Mandea M 2008 Nature(Geosci.) 1 390
[9] Wegener A 1912 Geol. Rundsch. 3 276
[10] Vine F J, Matthews D H 1963 Nature 199 947
[11] Purucker M E 2007 Eos.Trans. AGU 88 263
[12] Regan R D, Cain J C, Davis W M 1975 J. Geophys. Res. 80 794
[13] An Z C, Xu Y F, Wang Y H 1992 Chin. J. Space Sci. 12 123 (in Chinese) [安振昌、 徐元芳、 王月华 1992 空间科学学报 12 123]
[14] Maus S, Rother M, Holme R, Luhr H, Olsen N, Haak V 2002 Geophys. Res. Lett. 29 1
[15] Hemant K, Maus S 2005 Phys. Earth Planet Int. 149 321
[16] Thebault E 2006 Earth Planets Space 58 485
[17] Hemant K, Thébault E, Mandea M, Ravat D, Maus S 2007 Earth Planet Sci. Lett. 260 56
[18] Xu W Y 2009 Physics of Electromagnetic Phenomena of the Earth (Hefei: University of Science and Technology of China Press) p100 (in Chinese) [徐文耀 2009 地球电磁现象物理学 (合肥:中国科学技术大学出版社) 第100页]
[19] Sabaka T J, Baldwin R T 1993 NASA/GSFC Contract Report (Maryland: NASA/GSFC) p760
[20] Langel R A, Sabaka T J, Baldwin R T, Conrad J A 1996 Phys. Earth Planet Int. 98 235
[21] Sabaka T J, Olsen N, Langel R A 2002 Geophys. J. Int. 151 32
[22] Sabaka T J, Olsen N, Purucker M E 2004 Geophys. J. Int. 159 521
[23] Backus G E 1986 Rev. Geophys. 24 75
[24] Maeda H, Iyemori T, Araki T, Kamei T 1982 Geophys. Res. Lett. 9 337
[25] Olsen N, Glassmeier K H, Jia X 2010 Space Sci. Rev. 152 1
[26] Maus S 2008 Geophys. J. Int. 174 135
[27] Maus S 2008 Geochem. Geophys. Geosyst. 9 1
[28] Torta J M, Gaya-Pique L R, Curto J J, Altadill D 2008 J. Atmos. Terr. Phys. 71 1497
[29] Maus S, Barckhausen U, Berkenbosch H, Bournas N, Brozena J, Childers V, Dostaler F, Fairhead J D, Finn C, von Frese R R B, Gaina C, Golynsky S, Kucks R, Luhr H, Milligan P, Mogren S, Muller R D, Olesen O, Pilkington M, Saltus R, Schreckenberger B, Thebault E, Caratori T F 2009 Geochem. Geophys. Geosyst. 10 1
[30] Hulot G, Olsen N, Thebault E, Hemant K 2009 Geophys. J. Int. 177 361
[31] Olsen N, Mandea M, Sabaka T J, Tffner-Clausen L 2009 Geophys. J. Int. 179 1477
[32] Zhang X D, Liu X, Zhao P D 2009 Acta Phys. Sin. 58 4415 (in Chinese) [张晓丹、 刘 翔、 赵品栋 2009 58 4415]
[33] Langel R A, Estes R H, Mead G D 1982 J. Geomag. Geoelectr. 34 327
[34] Ravat D N, Langel R A, Purucker M E, Arkani-Hamed J, Alsdorf D E 1995 J. Geophys. Res. 100 111
[35] Olsen N 1993 Ann. Geophys. 11 254
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