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Equivalent water height extracted from GRACE gravity field model with robust independent component analysis

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Abstract

The Level-2 monthly GRACE gravity field models issued by Center for Space Research (CSR), GeoForschungs Zentrum (GFZ), and Jet Propulsion Laboratory (JPL) are treated as observations used to extract the equivalent water height (EWH) with the robust independent component analysis (RICA). The smoothing radii of 300, 400, and 500 km are tested, respectively, in the Gaussian smoothing kernel function to reduce the observation Gaussianity. Three independent components are obtained by RICA in the spatial domain; the first component matches the geophysical signal, and the other two match the north-south strip and the other noises. The first mode is used to estimate EWHs of CSR, JPL, and GFZ, and compared with the classical empirical decorrelation method (EDM). The EWH STDs for 12 months in 2010 extracted by RICA and EDM show the obvious fluctuation. The results indicate that the sharp EWH changes in some areas have an important global effect, like in Amazon, Mekong, and Zambezi basins.

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Authors and Affiliations

  1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China

    Jinyun Guo, Dapeng Mu, Xin Liu & Honglei Dai

  2. Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG, Qingdao, China

    Jinyun Guo, Dapeng Mu & Xin Liu

  3. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China

    Haoming Yan

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  1. Jinyun Guo
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  2. Dapeng Mu
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  3. Xin Liu
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  4. Haoming Yan
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  5. Honglei Dai
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Correspondence to Jinyun Guo.

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Guo, J., Mu, D., Liu, X. et al. Equivalent water height extracted from GRACE gravity field model with robust independent component analysis. Acta Geophys. 62, 953–972 (2014). https://doi.org/10.2478/s11600-014-0210-0

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