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

• Autorzy: Guo J. , Mu D. , Yan H. , Dai H.

Identyfikatory

DOI

10.2478/s11600-014-0210-0

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

GRACE; earth gravity filed model; equivalent water height; robust independent component analysis

PL

GRACE; model złożonej grawitacji ziemi; równoważna wysokość wody

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2014
• Tom: Vol. 62, no. 4
• Strony: 953--972
• Opis fizyczny: Bibliogr. 39 poz.

Twórcy

autor

Guo J.

• College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China
• Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG, Qingdao, China

autor

Mu D.

• College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao, China
• Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG, Qingdao, China

autor

Yan H.

• Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China

autor

Dai H.

• Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China

Bibliografia

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