Reference : Hydrological mass changes inferred from high-low satellite-to-satellite tracking data
Scientific congresses, symposiums and conference proceedings : Unpublished conference
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/10993/14181
Hydrological mass changes inferred from high-low satellite-to-satellite tracking data
English
van Dam, Tonie [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Weigelt, Matthias mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Tourian, M. J. [> >]
Sneeuw, N. []
Jäggi, A. []
Prange, L. [> >]
Apr-2013
No
No
International
European Geosciences Union General Assembly 2013
07-04-2013 to 12-04-2013
European Geoscience Union
Vienna
Austria
[en] Hydrological mass changes ; GRACE ; CHAMP ; high-low satellite-to-satellite tracking
[en] The technique of deriving time variable gravity (TVG) field observations from high-low satellite-to-satellite tracking (hl-SST) is beginning to establish itself as a valuable and supplementary source for the determination and description of long wavelength geophysical phenomena. Recent developments in data processing techniques have pushed the limits of the accuracy of these types of observations and now allows for realistic determinations of long-term trends and annual amplitudes of hydrological signals. We use CHAMP data and a dedicated signal processing to derive annual and inter-annual variations in the largest catchments of the Earth system, e.g. Amazon, Ob and Lena. Results are validated by computing the correlation of aggregated water storage changes from CHAMP (and GRACE) with the hydro-meteorological storage changes. High noise levels demand a stronger filtering, e.g. larger filtering radius (1000-1400km), than usually applied in case of GRACE. We therefore also investigate the effect of filtering on the consistency with the hydrological mass changes and estimate the signal to noise ratio and the spatial and temporal dependency of the noise. We will show that hl-SST observations are a viable source of information for TVG which can even serve as a reliable substitute in the event of the impending end of GRACE's active lifetime.
http://hdl.handle.net/10993/14181
http://meetingorganizer.copernicus.org/EGU2013/EGU2013-10138-1.pdf

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