Received date: 2007-05-23
Revised date: 2007-08-20
Online published: 2007-10-10
The problem of loading effect on high precision GPS observations is discussed in this paper. According to the Green's approach in theory of mass load on Earth's surface, the vertical displacements at some Chinese IGS stations due to mass load, including atmosphere, nontidal ocean and land water, are estimated. The atmosphere loading effects on different stations are of the similar characteristic, which has the magnitude of 20mm; the nontide ocean loading effects are accountable only at the costal stations, which have magnitude of 10mm; and the landwater loading effects are various at different stations, which have magnitude of 20mm. And the total effects of the three sources have obvious seasonal variation with magnitudes of the order of centimeter, which are corresponding to the mass load and comparable with the observations obtained by GPS. Especially for stations of Fangshan and Wulumuqi, the seasonal variations in GPS time series primarily result from mass load. Furthermore, although the stations of Kunming and Lasha locate in active plate motion area, the seasonal variations mostly attribute to surface mass load. Therefore, the GPS observations with the loading effect excluded will contribute more to investigation on the characteristic of crustal movement.
Key words： GPS; Vertical displacement; Surface mass load; Numerical model.
ZHOU Jiang-cun, SUN He-ping . Loading Effect on High Precision GPS Observations[J]. Advances in Earth Science, 2007 , 22(10) : 1036 -1040 . DOI: 10.11867/j.issn.1001-8166.2007.10.1036
[1]Zhang Feipeng, Dong Da'nan, Cheng Zongyi, et al. Crustal vertical seasonal variations in China observed by GPS[J]. Chinese Science Bulletin, 2002, 47(18):1 370-1 377.[张飞鹏,董大南,程宗颐,等.利用GPS监测中国地壳的垂向季节性变化[J]. 科学通报, 2002, 47(18): 1 370-1 377.]
[2]Larson M K, Freymueller J. Global plate velocities from Global Positioning System [J]. Journal of Geophysical Research, 1997, 102(B5): 9 961-9 981.
[3]Sun Jianzhong, Yang Shaomin. Tectonic movement of Chinese mainland revealed from GPS data[J]. Journal of Geodesy and Geodynamics, 2005, 25(3):75-80.[孙建中, 杨少敏. 用GPS资料揭示现今中国大陆构造运动[J]. 大地测量与地球动力学, 2005, 25(3):75-80.]
[4]Wang Min, Shen Zhengkang, Dong Da'nan. Non-tectonic crustal movement on continuous GPS position time series and correction to them[J]. Chinese Journal of Geophysics, 2005, 48(5): 1 045-1 052.[王敏, 沈正康, 董大南. 非构造形变对GPS连续站位置时间序列的影响和修正[J]. 地球物理学报, 2005, 48(5): 1 045-1 052.]
[5]Van Dam T, Wahr J, Milly P C D, et al. Crustal displacements due to continental water loading[J]. Geophysical Research Letters, 2001, 28(4): 651-654.
[6]Sun H P, Ducarme B, Dehant V. Effect of the atmospheric pressure on surface displacements[J]. Journal of Geodesy, 1995, 70: 131-139.
[7]Zhang Shiyu, Zhong Min, Tang Shihua. Vertical crustal displacements due to atmospheric loading effects at GPS fiducial stations in China[J]. Geomatics and Information Science of Wuhan University, 2006, 31(12): 1 090-1 093.[张诗玉, 钟敏, 唐诗华. 我国GPS基准站地壳垂直形变的大气负荷效应[J]. 武汉大学学报:信息科学版, 2006, 31(12): 1 090-1 093.]
[8]Zhou Jiangcun, Sun Heping. Effect of ocean tide loading on GPS baseline measurement[J].Journal of Geodesy and Geodynamics, 2005, 25(4):27-32.[周江存, 孙和平. 海潮负荷对GPS基线的影响[J]. 大地测量与地球动力学, 2005, 25(4):27-32.]
[9]Khan S A, Scherneck H G. The M2 ocean tide loading wave in Alaska: Vertical and horizontal displacements, modeled and observed[J]. Journal of Geodesy,2003, 77:117-127.
[10]Farrell W E. Deformation of the Earth by surface loads [J]. Reviews of Geophysics Space and Physics,1972,10: 761-797.
[11]Rodell M, Houser P R, Jambor U, et al. The Global Land Data Assimilation System[C]//American Meterorological Society,2004, March, 381-394.
[12]Jamason P, Bock Y, Fang P, et al. SOPAC web site (http://sopac.ucsd.edu)[J]. GPS Solutions,2004, 8(4): 272-277.
[13]Petrov L, Boy J P. Study of the atmospheric pressure loading signal in VLBI observations[J]. Journal of Geophysical Research,2004, 109: B03405, doi: 10.1029/2003JB002500.
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