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第四代地磁场综合模型CM4是迄今为止将地磁场的内源场和外源场分离得最为彻底的数学模型. 利用该模型结合Taylor多项式模型,基于1960—2000年期间中国大陆地区的实测数据,计算并分析了以10 a为间隔的内源场和外源场的变化情况,通过将1960—1990年的所有磁异常点归算至2000年以分析地壳磁异常场的总体分布趋势. 结果显示:地磁北向分量X的内源场强度总体呈逐年减弱的趋势,从1960年到2000年共下降了约750 nT,外源场强度总体呈先增强后减弱的趋势,共下降了约32 nT;地磁东向分量Y的内源场强度总体呈先减弱后增强的趋势,1960—2000年期间共上升了约40 nT,外源场强度总体呈先减弱后增强再减弱的趋势,共上升了约3.8 nT;地磁垂直分量Z的内源场变化趋势与Y分量类似,共上升了约600 nT,外源场总体呈先减弱后增强的趋势,共上升了约4.6 nT. 对于地壳磁异常场,X分量、Z分量、地磁总强度F和地磁水平分量H在中国大陆地区都为负异常分布,X分量和H分量的负异常强度随经度增加而减弱,Z分量和F分量则相反;Y分量和磁偏角D的分布较为类似,在中国的中西部大部分地区为正异常,强度随经度增加而减弱,磁倾角I主要以负异常为主,负异常强度随经度增加而增强.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 物理学报 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 物理学报 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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