GRACE-derived surface water mass anomalies by energy integral approach: application to continental hydrology |
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Authors: | Guillaume Ramillien R Biancale S Gratton X Vasseur S Bourgogne |
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Institution: | (1) Department 5: Earth Surface Processes, Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany |
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Abstract: | We propose an unconstrained approach to recover regional time-variations of surface mass anomalies using Level-1 Gravity Recovery
and Climate Experiment (GRACE) orbit observations, for reaching spatial resolutions of a few hundreds of kilometers. Potential
differences between the twin GRACE vehicles are determined along short satellite tracks using the energy integral method (i.e.,
integration of orbit parameters vs. time) in a quasi-inertial terrestrial reference frame. Potential differences residuals
corresponding mainly to changes in continental hydrology are then obtained after removing the gravitational effects of the
known geophysical phenomena that are mainly the static part of the Earth’s gravity field and time-varying contributions to
gravity (Sun, Moon, planets, atmosphere, ocean, tides, variations of Earth’s rotation axis) through ad hoc models. Regional
surface mass anomalies are restored from potential difference anomalies of 10 to 30-day orbits onto 1◦ continental grids by regularization techniques based on singular value decomposition. Error budget analysis has been made
by considering the important effects of spectrum truncation, the time length of observation (or spatial coverage of the data
to invert) and for different levels of noise. |
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