Workshop 2018
Benjamin Männel - The impact of atmospheric and hydrological surface loading corrections on GNSS orbits - October 29, 2018 • 197 Views
Time-dependent mass variations of near-surface geophysical fluids in atmosphere, oceans, and the continental hydrosphere lead to significant and systematic load-induced deformations of the Earth's crust, spatiotemporal variations of the Earth’s gravity field, and changes in Earth rotation. Over the past years, several authors discussed the beneficial impact that non-tidal surface loading corrections applied at observation level have on space geodetic parameters like station coordinates. Required loading corrections could be derived, for example, by using Green’s functions to calculate the response of Earth’s surface on modeled mass redistribution in atmosphere and hydrosphere. Corresponding deformation products provided by GFZ and publicly available at http://isdc.gfz-potsdam.de/esmdata/loading contain vertical and horizontal crust deformations imposed by surface loading in atmosphere, oceans, and the continental hydrosphere with a spatial resolution of 0.5° and a temporal sampling of down to 3 hours (Dill and Dobslaw, 2013). In order to assess the impact of correcting for surface loading at the observation level, GNSS observations derived by a globally distributed network of totally 180 stations were reprocessed for the years 2008 to 2017. Two types of daily network solutions were generated, one without and one with applying the full set of loading corrections (i.e. the sum of atmosphere, ocean, and continental hydrology). By comparing both solutions, the impact of non-tidal surface loading corrections on GNSS orbit determination will be discussed. The comparison itself is based on geometrical differences between orbit positions, transformation parameters between the orbits, overlap analyses and SLR validations. In addition, the impact of surface loading corrections on the orbits will be compared to the effect on station coordinates and Earth rotation parameters. Preliminary results indicate small differences in the orbit positions of some millimeters due to applied non-tidal surface loading corrections.

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