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The Quasi-Biennial Vertical Oscillations at Global GPS Stations: Identification by Ensemble Empirical Mode Decomposition

文献类型：期刊论文

作者Pan, Yuanjin1; Shen, Wen-Bin1,2; Ding, Hao1; Hwang, Cheinway3; Li, Jin4; Zhang, Tengxu1
刊名SENSORS
出版日期2015-10-01
卷号15期号:10页码:26096-26114
关键词GPS time series ensemble empirical mode decomposition (EEMD) quasi-biennial vertical oscillations loading effects
英文摘要Modeling nonlinear vertical components of a GPS time series is critical to separating sources contributing to mass displacements. Improved vertical precision in GPS positioning at stations for velocity fields is key to resolving the mechanism of certain geophysical phenomena. In this paper, we use ensemble empirical mode decomposition (EEMD) to analyze the daily GPS time series at 89 continuous GPS stations, spanning from 2002 to 2013. EEMD decomposes a GPS time series into different intrinsic mode functions (IMFs), which are used to identify different kinds of signals and secular terms. Our study suggests that the GPS records contain not only the well-known signals (such as semi-annual and annual signals) but also the seldom-noted quasi-biennial oscillations (QBS). The quasi-biennial signals are explained by modeled loadings of atmosphere, non-tidal and hydrology that deform the surface around the GPS stations. In addition, the loadings derived from GRACE gravity changes are also consistent with the quasi-biennial deformations derived from the GPS observations. By removing the modeled components, the weighted root-mean-square (WRMS) variation of the GPS time series is reduced by 7.1% to 42.3%, and especially, after removing the seasonal and QBO signals, the average improvement percentages for seasonal and QBO signals are 25.6% and 7.5%, respectively, suggesting that it is significant to consider the QBS signals in the GPS records to improve the observed vertical deformations.
WOS标题词Science & Technology ; Physical Sciences ; Technology
类目[WOS]Chemistry, Analytical ; Electrochemistry ; Instruments & Instrumentation
研究领域[WOS]Chemistry ; Electrochemistry ; Instruments & Instrumentation
关键词[WOS]TIME-SERIES ; DEFORMATION ; EARTH ; SPECTRUM ; SIGNALS
收录类别SCI
语种英语
WOS记录号WOS:000364242300074
源URL[http://119.78.226.72/handle/331011/28395]  
专题上海天文台_天文地球动力学研究中心
作者单位1.Wuhan Univ, Sch Geodesy & Geomat, Wuhan 430079, Peoples R China
2.Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, Wuhan 430079, Peoples R China
3.Natl Chiao Tung Univ, Dept Civil Engn, Hsinchu 300, Taiwan
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式
GB/T 7714		 Pan, Yuanjin,Shen, Wen-Bin,Ding, Hao,et al. The Quasi-Biennial Vertical Oscillations at Global GPS Stations: Identification by Ensemble Empirical Mode Decomposition[J]. SENSORS,2015,15(10):26096-26114.
APA Pan, Yuanjin,Shen, Wen-Bin,Ding, Hao,Hwang, Cheinway,Li, Jin,&Zhang, Tengxu.(2015).The Quasi-Biennial Vertical Oscillations at Global GPS Stations: Identification by Ensemble Empirical Mode Decomposition.SENSORS,15(10),26096-26114.
MLA Pan, Yuanjin,et al."The Quasi-Biennial Vertical Oscillations at Global GPS Stations: Identification by Ensemble Empirical Mode Decomposition".SENSORS 15.10(2015):26096-26114.

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来源：上海天文台

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