Sensitivity of superconducting gravimeters in central Europe on variations in regional river and drainage basins |
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| Authors: | C Kroner A Weise |
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| Institution: | 1.Helmholtz Centre Potsdam German Reserach Centre for Geosciences,Potsdam,Germany;2.Physikalisch-Technische Bundesanstalt,Braunschweig,Germany;3.Institute of Geosciences,Friedrich-Schiller-University Jena,Jena,Germany |
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| Abstract: | As underpinned by various studies in the last years, temporal changes of the Earth’s gravity field contain a wealth of information
on mass redistribution processes in the Earth’s system particularly associated with variations in continental water storage.
By combining satellite and terrestrial observations with superconducting gravimeters (SG) a maximum of information can be
gained due to the different temporal and spatial sampling. Esp. the cluster of superconducting gravimeters in central Europe
is well suited for studies related to spatial and temporal changes in continental water storage. Due to the distribution of
SG sites different sensitivities of the instruments are to be expected on changes in the various river and drainage basins
which could, if sufficiently pronounced, be deployed to pinpoint areas in which main discrepancies between modelled and actual
water storage changes occur and would thus allow us to fine-tune hydrological models. Based on the WaterGap Global Hydrological
Model (WGHM), this sensitivity of the SG observations is investigated. One compartment of the WGHM is surface water, thus
comprising rivers, flooding areas, and major reservoirs. This contribution is given for the total cell of 0.5° × 0.5° and
not localized, e.g. in a riverbed, therefore the question arises to which extent localization or non-localization of this
compartment affects the estimate if the respective surface waters are in the vicinity of 50 km around the SG stations. It
can be shown, however, that the lateral distribution of the surface water masses plays only a negligible role for the central
European stations meaning distributed surface water masses are an acceptable simplification when estimating hydrological effects.
It emerges that variations in water storage in regions outside central Europe produce comparable effects on gravity at all
sites and the impact of basins within central Europe is clearly distinguishable among the SG stations. |
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