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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Surface Mass Variability from GRACE and Hydrological Models: Characteristic Periods and the Reconstruction of Significant Signals
verfasst von : Svetozar Petrovic, Roland Braun, Franz Barthelmes, Johann Wünsch, Jürgen Kusche, Rico Hengst
Erschienen in: System Earth via Geodetic-Geophysical Space Techniques
Verlag: Springer Berlin Heidelberg
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Abstract
In order to analyse spatio-temporal variations of surface mass anomalies induced by hydrological mass redistributions at the Earth’s surface we use products from the Gravity Recovery and Climate Experiment (GRACE) satellite mission as well as global hydrological models. As a novelty we identify dominant periodic patterns that are not restricted to the fundamental annual frequency and its overtones, using a method that combines conventional Principal Components Analysis (PCA) with a determination of sine waves of arbitrary periods from the principal components. We assess the significance of the derived spectra taking into account correlated errors of the GRACE data by means of a Monte-Carlo technique. This allows us to create filtered GRACE time series including only the significant terms, which serve for basin-specific calibration of hydrological models with respect to the dominant periodic water storage variations.