大气负荷对新疆地区地壳形变和地面重力变化的影响
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摘要
基于ECMWF全球大气模型和中国地面气候资料日值数据集中新疆及周边的气象站气压数据,根据弹性地壳形变理论,采用移去-恢复法,利用负荷格林函数法和球谐函数法,计算新疆及周边区域2011～2015年大气负荷变化对地壳垂直、水平形变的影响,同时采用大气导纳方法计算大气变化对地面重力的影响。结果表明,大气负荷对新疆地区垂直形变的影响达到cm级,对地面重力的影响可达10μGal;大气负荷影响具有明显的季节性。
Based on the ECMWF global atmospheric model and the daily data of the surface climatological data in China,the pressure data of the meteorological stations in Xinjiang and surrounding areas are concentrated.According to the theory of elastic crustal deformation,the method of removal and recovery is adopted,and Green's function and the spherical harmonic function method are used to study and calculate its effect on atmospheric load on the vertical and horizontal deformation of the crust,during the period from 2011 to 2015in Xinjiang and the surrounding area.At the same time,the atmospheric admittance method is used to calculate the influence of atmospheric variance on ground gravity.The results indicate:1)the influence of atmospheric load on vertical deformation in Xinjiang reaches the centimeter level,and the influence on ground gravity can reach 10μGal;2)the influence of atmospheric load has significant seasonality.
Based on the ECMWF global atmospheric model and the daily data of the surface climatological data in China,the pressure data of the meteorological stations in Xinjiang and surrounding areas are concentrated.According to the theory of elastic crustal deformation,the method of removal and recovery is adopted,and Green's function and the spherical harmonic function method are used to study and calculate its effect on atmospheric load on the vertical and horizontal deformation of the crust,during the period from 2011 to 2015in Xinjiang and the surrounding area.At the same time,the atmospheric admittance method is used to calculate the influence of atmospheric variance on ground gravity.The results indicate:1)the influence of atmospheric load on vertical deformation in Xinjiang reaches the centimeter level,and the influence on ground gravity can reach 10μGal;2)the influence of atmospheric load has significant seasonality.
引文
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[11]党亚民.现代大地测量基准[M].北京:测绘出版社,2015(Dang Yamin.Modern Geodetic Datum[M].Beijing:Surveying and Mapping Press,2015)
[12]郭春喜,宁津生,陈俊勇,等.珠峰地区似大地水准面精化与珠峰顶正高的确定[J].地球物理学报,2008,51(1):101-107(Guo Chunxi,Ning Jinsheng,Chen Junyong,et al.Improvement of Regional Quasi-Geoid in Qomolangma(Mt.Everest)and Determination of Orthometric Elevation[J].Chinese Journal of Geophysics,2008,51(1):101-107)
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[2]罗少聪.大气负荷效应问题研究[D].武汉:中国科学院测量与地球物理研究所,2003(Luo Shaocong.Study on the Loading Effects on the Atmospheric Pressure[D].Wuhan:Institute of Geodesy and Geophysics,CAS,2003)
[3]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(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)
[4] Farrell W E.Deformation of the Earth by Surface Loads[J].Reviews of Geophysics,1972,10(3):761-797
[5] Longman I M.A Green’s Function for Determining the Deformation of the Earth under Surface Mass Loads[J].Journal of Geophysical Research,1962,67(2):845-850
[6] Spratt R S.Modeling the Effect of Atmospheric Pressure Variations on Gravity[J].Geophysical Journal International,2010,71(1):173-186
[7] Mangiarotti S,Cazenave A,Soudarin L,et al.Annual Vertical Crustal Motions Predicted from Surface Mass Redistribution and Observed by Space Geodesy[J].Journal of Geophysical Research:Solid Earth,2001,106(B3):4 277-4 292
[8] Mitrovica J X,Davis J L,Shapiro I I.A Spectral Formalism for Computing Three-Dimensional Deformations Due to Surface Loads:2.Present-Day Glacial Isostatic Adjustment[J].Journal of Geophysical Research:Solid Earth,1994,99(B4):7 075-7 101
[9]沈迎春,闫昊明,彭鹏,等.质量负荷引起地表形变的格林函数和球谐函数方法对比研究[J].武汉大学学报:信息科学版,2017,42(7):1 008-1 014(Shen Yingchun,Yan Haoming,Peng Peng,et al.Comparative Study of Green’s Function and Spherical Harmonic Function Methods on Surface Deformation Caused by Mass Loading[J].Geomatics and Information Science of Wuhan University,2017,42(7):1 008-1 014)
[10]王伟,党亚民,章传银,等.基于CORS站网监测三峡地区陆地水负荷对地壳形变和重力变化的影响[J].地球物理学报,2017,60(3):962-971(Wang Wei,Dang Yamin,Zhang Chuanyin,et al.Monitoring of Crustal Deformation and Gravity Variation from Terrestrial Water Loading in the Three Gorges Region by the CORS Network[J].Chinese Journal of Geophysics,2017,60(3):962-971)
[11]党亚民.现代大地测量基准[M].北京:测绘出版社,2015(Dang Yamin.Modern Geodetic Datum[M].Beijing:Surveying and Mapping Press,2015)
[12]郭春喜,宁津生,陈俊勇,等.珠峰地区似大地水准面精化与珠峰顶正高的确定[J].地球物理学报,2008,51(1):101-107(Guo Chunxi,Ning Jinsheng,Chen Junyong,et al.Improvement of Regional Quasi-Geoid in Qomolangma(Mt.Everest)and Determination of Orthometric Elevation[J].Chinese Journal of Geophysics,2008,51(1):101-107)
[13]Ray R D,Ponte R M.Barometric Tides from ECMWF Operational Analyses[J].Ann Geophys,2003,21(8):1 897-1 910
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