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Information - G3 Continental hydrology observed with GPS inversions, GRACE gravity and microwave remote sensing (co-listed in HS)
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Space geodesy offers a unique window into the continental water cycle, due to its ability to sense the lateral movement of mass within the entire hydrosphere, including ground and surface water. For geometric geodetic techniques such as GPS, SLR, and VLBI coordinate estimation, this sensitivity arises from the measurable deformation of the solid Earth due to the mass load. In contrast, gravimetric techniques such as GRACE sense mass movements as a direct result of the perturbation of the Earth's gravity field. The increasing density of the IGS network of GPS sites, and the maturing availability of GRACE mission products, mean that these complementary methods are now able to image continental hydrology at unprecedented spatial and temporal resolution. In addition, there have been important developments in the field of microwave remote sensing where first long-term global surface soil moisture products derived from passive and active microwave data have now become available. A lso, NASA and ESA are preparing for the launch of the first satellite missions dedicated to the measurement of soil moisture at global scale (SMOS and HYDROS).
We welcome presentations of (i) observations of continental hydrology using either geometric (esp. GPS) or gravimetric (esp. GRACE) geodesy, or both; (ii) global observations of soil moisture using microwave remote sensing satellites; (iii) attempts to relate these regional-scale observations to those from other measurement techniques or models; and (iv) discussions of the error budget and theoretical analysis limits to these techniques, both present and future.
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