This study investigates the characteristics of gravity and ocean tides using time series recorded with the spring gravimeter and tide gauge at Zhongshan station, CATS2008 regional ocean tide model, and Eot11a global ocean tide model. The results show that the ocean tidal amplitude of O1 wave reaches 28 cm in the diurnal tidal bands. The sum of four tidals (Q1, O1, P1 and K1) difference between the global model and the tide gauge station is 4.2 cm, and that between the regional model and the tide gauge station is 4.4 cm. In contrast, the tidal amplitude of M2 wave reaches 20 cm in the semi-diurnal bands, and the sum of four tidals (N2, M2, S2 and K2) difference are 7.7 cm and 5.1 cm, respectively. This shows that correcting global ocean tide model using regional models is important. Subsequent to the correction of global oceanic loading using the regional model, the amplitudes of final residuals for the main gravity waves K1, M2, and S2 decreased by 9.84%, 56.14%, and 37.08%, respectively, which indicates that the regional ocean tide model can better reflect the true characteristics of ocean tides. Moreover, the validity of correcting global ocean tide model using the regional model is verified.
[1] SHEPHERD A,PEACOCK N R.Ice Shelf Tidal Motion Derived from ERS Altimetry[J].Journal of Geophysical Research,2003,108(C6):3189.
[2] VELICOGNA I,WAHR J.Measurements of Time-variable Gravity Show Mass Loss in Antarctica[J].Science,2006,311(5768):1754-1756.
[3] 张胜凯,雷锦韬,李斐.全球海潮模型研究进展[J].地球科学进展,2015,30(5):579-588. ZHANG Shengkai,LEI Jintao,LI Fei.Advances in Global Ocean Tide Models[J].Advances in Earth Science,2015,30(5):579-588.
[4] 刘清超,孙和平,徐建桥,等.南极中山与昭和站重力海潮负荷效应及背景噪声研究[J].地球物理学报,2016,59(8):2773-2782. LIU Qingchao,SUN Heping,XU Jianqiao,et al.The Research of Ocean Tide Loading Effects on Gravity and Ambient Noise at Zhongshan and Syowa Station in Antarctic[J].Chinese Journal of Geophysics,2016,59(8):2773-2782.
[5] KIM T H,SHIBUYA K,DOI K,et al.Validation of Global Ocean Tide Models Using the Superconducting Gravimeter Data at Syowa Station,Antarctica,and in Situ Tide Gauge and Bottom-pressure Observations[J].Polar Science,2011,5(1):21-39.
[6] 周江存,孙和平.用东海和南海潮汐资料修正全球海潮模型对中国及邻区重力场负荷计算的影响[J].地震学报,2005,27(3):332-338. ZHOU Jiangcun,SUN Heping.Influence of the Modified Global Ocean Tide Model with Local Tides of East and South China Seas on Load Gravity in China and Its Neighbor Area[J].Acta Seismologica Sinica,2005,27(3):332-338.
[7] PADMAN L,KOTTMEIER C.High-frequency Ice Motion and Divergence in the Weddell Sea[J].Journal of Geophysical Research,2000,105(C2):3379-3400.
[8] 孙和平,许厚泽,徐建桥,等.重力场的潮汐变化观测及其研究[J].地球科学进展,2000,15(1):53-57. SUN Heping,XU Houtze,XU Jianqiao,et al.Observation and Study of the Tidal Variation in Gravity Field[J].Advance in Earth Sciences,2000,15(1):53-57.
[9] 徐建桥,孙和平,周江存.南极中山站重力潮汐观测的海潮负荷效应[J].测绘学报,2002,31(3):228-233. XU Jianqiao,SUN Heping,ZHOU Jiangcun.Loading Effects of the Ocean Tides on the Tidal Gravity Observations at Zhongshan Station in the Antarctic[J].Acta Geodaetica et Cartographica Sinica,2002,31(3):228-233.
[10] 胡胜利.南极中山站天气系统和气象要素变化[J].海洋预报,2001,18(1):34-39. HU Shengli.The Variation of Weather System and Meteorological Elements[J].Marine Forecasts,2001,18(1):34-39.
[11] 黄继锋,鄂栋臣,张胜凯,等.南极中山验潮站的数据处理与分析[J].大地测量与地球动力学,2012,32(5):63-67. HUANG Jifeng,E Dongchen,ZHANG Shengkai,et al.Processing and Analysis of Tidal Data for Zhongshan Station,East Antarctica[J].Journal of Geodesy and Geodynamics,2012,32(5):63-67.
[12] VAN CAMP M,VAUTERIN P.Tsoft:Graphical and Interactive Software for the Analysis of Time Series and Earth Tides[J].Computers & Geosciences,2005,31(5):631-640.
[13] WAHR J M.Deformation Induced by Polar Motion[J].Journal of Geophysical Research,1985,90(B11):9363-9368.
[14] WENZEL H G.The Nanogal Software:Earth Tide Data Processing Package ETERNA 3.30[J].Bulletin d'Informations Mareés Terrestres,1996,124:9425-9439.
[15] DEHANT V,DEFRAIGNE P,WAHR J M.Tides for a Convective Earth[J].Journal of Geophysical Research,1999,104(B1):1035-1058.
[16] IWANO S,FUKUDA Y,SATO T,et al.Long-period Tidal Factors at Antarctica Syowa Station Determined from 10 Years of Superconducting Gravimeter Data[J].Journal of Geophysical Research,2005,110(B10):B10403.
[17] FOREMAN M G G,CHERNIAWSKY J Y,BALLANTYNE V A.Versatile Harmonic Tidal Analysis:Improvements and Applications[J].Journal of Atmospheric and Oceanic Technology,2009,26(4):806-817.
[18] CARTWRIGHT D E,TAYLER R J.New Computations of the Tide-generating Potential[J].Geophysical Journal International,1971,23(1):45-73.
[19] FOREMAN M G G.Manual for Tidal Heights Analysis and Prediction[R]. Victoria:Institute of Ocean Sciences, 1977.
[20] GOLUB G H,VAN LOAN C F.Matrix Computations[M].Baltimore:The Johns Hopkins University Press,1983.
[21] 鄂栋臣,黄继锋,张胜凯.南极中山站潮汐特征分析[J].武汉大学学报(信息科学版),2013,38(4):379-382,464. E Dongchen,HUANG Jifeng,ZHANG Shengkai.Analysis of Tidal Features of Zhongshan Station,East Antarctic[J].Geomatics and Information Science of Wuhan University,2013,38(4):379-382,464.
[22] FARRELL W E.Deformation of the Earth by Surface Loads[J].Reviews of Geophysics,1972,10(3):761-797.
[23] 许厚泽.固体地球潮汐[M].武汉:湖北科学技术出版社,2010. XU Houze.Solid Earth Tide[M].Wuhan:Hubei Science and Technology Press,2010.
[24] SAVCENKO R,BOSCH W.EOT11A-empirical Ocean Tide Model from Multi-mission Satellite Altimetry[R].München:Deutsches Geodätisches Forschungs Institut (DGFI),2012.
[25] PADMAN L,EROFEEVAR L,FRICHER H,et al.CATS2008a_opt:Circum-Antarctic Tidal Simulation Inverse Model Version 2008a.2008.
[26] AGNEW D C.SPOTL:Some Programs for Ocean-tide Loading[R].[S.l.]:Scripps Institution of Oceanography,2012.
[27] 孙和平,许厚泽,罗少聪,等.用超导重力仪的潮汐观测资料研究海潮模型[J].测绘学报,1999,28(2):115-120. SUN Heping,XU Houze,LUO Shaocong,et al.Study of the Ocean Models Using Tidal Gravity Observations Obtained with Superconducting Gravimeter[J].Acta Geodaetica et Cartographica Sinica,1999,28(2):115-120.
