孙健,李建成,徐新禹

• 1:武汉大学测绘学院
• 2:武汉大学地球空间环境与地球物理大地测量教育部重点实验室

摘要(Abstract)：

为了探索地表质量迁移对日长变化的激发作用,文章在原始日长变化中扣除了固体潮、10年尺度信号、风和洋流效应,得到残余日长变化。然后分别利用AOH气候模型、SLR数据和CSR、GFZ、JPL提供的RL05版本的GRACE月重力场模型,计算了地表质量迁移对日长变化的激发作用。通过分析发现,和SLR、AOH质量激发相比,在季节性尺度上,3种GRACE质量激发能够更好地解释残余日长变化中周年和半周年的起伏,尤其是在周年项上,3种GRACE质量激发和残余日长变化间十分接近;在季节内尺度上,GRACE(GFZ)质量激发同样可以更好地解释残余日长变化,而GRACE(GFZ)和GRACE(JPL)质量激发由于包含一个周期为5.6个月的信号,与残余日长变化的相干性很低。

关键词(KeyWords)： 重力场;日长变化;GRACE;SLR;激发

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 孙健,李建成,徐新禹

DOI: 10.16251/j.cnki.1009-2307.2014.09.010

参考文献(References)：

• [1]闫昊明,钟敏,朱耀仲.大气对地球自转变化的影响——方法和数据的深入分析[J].天文学报,2005,46(04).
• [2]C F Yoder,J G Williams,M E Parke.Tidal Variaions of Earth Rotation[J].J.Geophys.Res.,1981.
• [3]傅容珊,李力刚,郑大伟,薛霆啸.核幔边界动力学——地球自转十年尺度波动[J].地球科学进展,1999,14(06):541-548.
• [4]虞南华,郑大伟.大气对地球自转季节性变化的贡献[J].天文学报,2000,41(02):148-152.
• [5]PBrosche,J Wunsch,A Frische,et al.The seasonal variation of the angular momentum of the oceans[J].Naturwissenschaften,1990,77:185-186.
• [6]T J Johnson,C R Wilson.Oceanic angular momentum variability estimated from the parallel ocean climate model,1988~1998[J].J Geophys Res.,1999,104:25183-25195.
• [7]廖德春,廖新浩.全球陆地水储量对地球自转变化的激发作用[J].天文学报,2000,41(04).
• [8]J L Chen,C R Wilson.Low degree gravitational changes from Earth rotation and geophysical models[J].Geophy Res Lett,2003.
• [9]J L Chen,C R Wilson,B D Tapley,J C Ries.Low degree gravitational changes from GRACE:Validation and interpretation[J].Geophys.Res.Lett.,2004,31,doi:10.1029/2004GL021670.
• [10]J L Chen,C R Wilson,B D Tapley.Interannual variability of low-degree gravitational changes,1980-2002[J].Journal of Geodesy,2005,78:535-543,doi:10.1007/s00190-004-0417-y.
• [11]J L Chen,C R Wilson.Low degree gravity changes from GRACE,Earth rotation,geophysical models,and satellite laser ranging[J].J.Geophy,2008,doi:10.1029/2007JB005397.
• [12]S G Jin,L J Zhang,B D Tapley.The understanding of length-of-day variations from satellite gravity and laser ranging measurements[J].Geophys.J.Int.,2011,184:651-660,Doi:10.1111/j.1365-246X.2010.04869.x.
• [13]C Dahle,F Flechtner,C Gruber,D Knig,R Knig,G Michalak,Karl-Hans Neumayer.GFZ GRACE Level-2Processing Standards Document for Level-2 Product Release 0005[J].Scientific Technical Report-Data,Potsdam,2012,DOI:10.2312/GFZ.b103-12020.
• [14]W H Munk,G J F MacDonald.The Rotation of the Earth[M].New York:Cambridge Univ.Press,1960.
• [15]I Fukumori,T Lee,D Menemenlis,L Fu,B Cheng,B Tang,Z Xing,and R Giering.A dual assimilation system for satellite altimetry,Joint TOPEX/POSEIDON and Jason-1Science Working Team Meeting[C]//Miami Beach,Fla.,15-17November,2000.
• [16]S Bettadpur.Gravity Recovery and Climate Experiment Level-2gravity field product user handbook[R].Cent.For Space res.,2007.
• [17]M K Cheng,C K Shum,B D Tapley.Determination of long term changes in the Earth’s gravity field from satellite laser ranging observations[J].J.Geophys Res,1997.