利用积谱研究气压对SGC053超导重力仪的影响
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摘要
利用中国地震局武汉九峰地震台SGC053超导重力仪超过13 000小时的重力固体潮和气压观测数据进行相关分析和积谱分析。结果表明:重力残差信号主要是由气压变化引起的,相关分析的气压导纳值为-3.116nms-2/mbar;气压导纳值和频率之间具有依赖性,气压导纳绝对值频率依赖方程为y=7.036x+2.524;利用固定气压导纳值和导纳值频率依赖的方程进行气压改正结果几乎一致,相差不超过±(1～2)nms-2。
The correlation and product spectra between the gravity earth tide for over 13 000 hours observed with SGC053 at Jiufeng station and the barometric pressure were analyzed.It is shown that the barometric pressure is the main factor leading to gravity change.And the atmospheric pressure admittance is-3.116 nms-2/mbar.The atmospheric pressure admitlance is depended on the frequency.According to the 7 product spectral lines,atmospheric pressure admittances was fitted with linear.The frequency-dependent atmospheric pressure admittance function is y=7.036x+2.524.The freq-Dep admittance correction is almost consistent with constant admittance correction.The difference between the corrected results with the two methods is less than ±(1-2)nms-2.
The correlation and product spectra between the gravity earth tide for over 13 000 hours observed with SGC053 at Jiufeng station and the barometric pressure were analyzed.It is shown that the barometric pressure is the main factor leading to gravity change.And the atmospheric pressure admittance is-3.116 nms-2/mbar.The atmospheric pressure admitlance is depended on the frequency.According to the 7 product spectral lines,atmospheric pressure admittances was fitted with linear.The frequency-dependent atmospheric pressure admittance function is y=7.036x+2.524.The freq-Dep admittance correction is almost consistent with constant admittance correction.The difference between the corrected results with the two methods is less than ±(1-2)nms-2.
引文
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2 Mahmoud Abd El-Gelil,et al.Frequency-dependent at-mospheric pressure admittance of superconducting gravimeterrecords using least squares response method[J].Physics ofthe Earth and Planetary Interiors,2008,(170):24-33
3 Smylie D E,et al.The product spectra of gravity and baro-metric pressure in Europe[J].Physics of the Earth and Plan-etary Interiors,1993(80):135-157
4孙和平,等.基于国际超导重力仪观测资料检测地球固态内核的平动振荡[J].科学通报,2004,49(8):803-813.(Sun Heping,et al.Preliminary results of the free core nuta-tion eigenperiod obtained by stocking SG observation at GGP[J].Chinese Science Bulletin,2004,49(8):803-813)
5徐建桥.重力固体潮汐理论及分析方法——武汉台超导重力仪观测资料的分析处理[D].中国科学院测量与地球物理研究所,1997.(Xu Jianqiao.The theory and analysisof gravity tidal——superconducting gravimeter data analysisand processing in Wuhan station[D].Institute of Geodesyand Geophysics Chinese Academy of Sciences,1997)
6刘子维,等.SG-053超导重力仪的观测结果分析[J].大地测量与地球动力学,2010,(6):157-160.(Liu Ziwei,etal.Analysis of observations of superconducting gravimeterSG-053[J].Journal of Geodesy and Geodynamics,2010,(6):157-160)
7邢乐林,等.利用绝对重力测量精密测定超导重力仪的格值因子[J].大地测量与地球动力学,2009,(2):96-99.(Xing Lelin,et al.Scale factor calibration of superconductinggravimeter by using absolute gravimetery[J].Journal of Ge-odesy and Geodynamics,2010,(1):96-99)
8徐建桥,等.武汉基准台气压对重力潮汐观测的影响[J].测绘学报,1999,28(1):5-15.(Xu Jianqiao,et al.Influ-ence of atmospheric pressure on tidal gravity at Wuhan sta-tion[J].Acta Geodaetica et Cartographica Sinica,1999,28(1):5-15)
9韦进,等.超导重力观测噪声水平的极大似然估计[J].大地测量与地球动力学,2011,31(3):69-74.(Wei Jin,etal.Noise level measurement of SG-053 with MLE[J].Jour-nal of Geodesy and Geodynamics,2011,31(3):69-74)
10 Severine Rosat,et al.The search for the Slichter mode:com-parison of noise levels of superconducting gravimeters andinvestigation of a stacking method[J].Physics of the Earthand Planetary Interiors,2003,(140):183-202.
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