Comparisons of GRACE and GLDAS derived hydrological loading and the impacts on the GPS time series in Europe

IF 0.9 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Yankai Bian
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引用次数: 3

Abstract

The surface displacement caused by hydrological loading makes an important contribution to the non-linear crustal movement observed at the International Global Navigation Satellite System Service (IGS) stations. In this paper, the amplitude, correlation, and root mean square (RMS) of the vertical displacement time series signals of 47 IGS stations are used to analyze which data of Gravity Recovery and Climate Experiment (GRACE) or Global Land Data Assimilation System (GLDAS) can better reflect the hydrological load effect in Europe. The results show that in Europe, the hydrological load effect calculated based on GRACE data is more accurate than that of GLDAS, which has not been reported before. Then, the relationship between the GPS height and GRACE load deformation in terms of annually-oscillating signals, correlation, and phase is analyzed by using singular spectrum analysis, the Pearson correlation coefficient, and wavelet coherence (WTC). It was found that GPS and GRACE agree at some stations (e.g., BOR1 and ZIMM), while they differ significantly in amplitude and phase at other stations (e.g., KIRU and NOT1), indicating that not all GRACE-derived displacements of IGS stations can clearly explain their nonlinear motion. The correlation coefficients between GPS and GRACE are higher than 0.7 at 85 % of stations. Amongst them, the values are obviously greater than 0.8 (e.g., ZIMM and LAMA) around inland areas and high mountains, and even less than 0.6 (e.g., ANKR and KIRU) along the coast of the Mediterranean ocean, which more precisely shows that the hydrological load effect has obvious spatial and regional characteristics compared with previous studies. In addition, the relative phase of the WTC solution is basically consistent under non-detrend and detrend, which shows that the relative phase difference of each station is only related to the nonlinear movement and not to the linear trend caused by the tectonic deformation. Finally, we study the influence of GRACE hydrological load on the RMS of GPS height, which is reduced by 24.60 % on average, and the reduction rate distribution of the RMS is in good agreement with the spatial distribution of the correlation coefficient. ARTICLE INFO
GRACE和GLDAS导出的欧洲水文负荷及其对GPS时间序列的影响的比较
水文载荷引起的地表位移对国际全球导航卫星系统服务站观测到的非线性地壳运动做出了重要贡献。本文利用47个IGS站垂直位移时间序列信号的幅度、相关性和均方根(RMS),分析了重力恢复与气候实验(GRACE)和全球陆地数据同化系统(GLDAS)中哪些数据能更好地反映欧洲的水文负荷效应。结果表明,在欧洲,基于GRACE数据计算的水文负荷效应比以前从未报道过的GLDAS更准确。然后,利用奇异谱分析、Pearson相关系数和小波相干性(WTC)分析了GPS高度与GRACE载荷变形之间的年振荡信号、相关性和相位的关系。研究发现,GPS和GRACE在一些站点(例如BOR1和ZIMM)一致,而在其他站点(例如KIRU和NOT1),它们在振幅和相位上显著不同,这表明并非所有IGS站点的GRACE导出的位移都能清楚地解释其非线性运动。85%的台站GPS与GRACE的相关系数大于0.7。其中,内陆地区和高山地区的数值明显大于0.8(如ZIMM和LAMA),地中海沿岸的数值甚至小于0.6(如ANKR和KIRU),这更准确地表明,与以往的研究相比,水文负荷效应具有明显的空间和区域特征。此外,WTC解在非去趋势和去趋势下的相对相位基本一致,这表明每个站的相对相位差只与非线性运动有关,而与构造变形引起的线性趋势无关。最后,我们研究了GRACE水文负荷对GPS高度RMS的影响,平均降低24.60%,RMS的降低率分布与相关系数的空间分布非常一致。文章信息
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来源期刊
Acta Geodynamica et Geomaterialia
Acta Geodynamica et Geomaterialia 地学-地球化学与地球物理
CiteScore
2.30
自引率
0.00%
发文量
12
期刊介绍: Acta geodynamica et geomaterialia (AGG) has been published by the Institute of Rock Structures and Mechanics, Czech Academy of Sciences since 2004, formerly known as Acta Montana published from the beginning of sixties till 2003. Approximately 40 articles per year in four issues are published, covering observations related to central Europe and new theoretical developments and interpretations in these disciplines. It is possible to publish occasionally research articles from other regions of the world, only if they present substantial advance in methodological or theoretical development with worldwide impact. The Board of Editors is international in representation.
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