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Discussion papers | Copyright
https://doi.org/10.5194/esurf-2017-70
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 12 Jan 2018

Research article | 12 Jan 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth Surface Dynamics (ESurf).

Earth's surface mass transport derived from GRACE, evaluated by GPS, ICESat, hydrological modeling and altimetry satellite orbits

Christian Gruber1, Sergei Rudenko2, Andreas Groh3, Dimitrios Ampatzidis4, and Elisa Fagiolini1 Christian Gruber et al.
  • 1Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Section 1.2: Global Geomonitoring and Gravity Field, c/o DLR Oberpfaffenhofen, Münchener Strasse 20, 82234 Wessling, Germany
  • 2Deutsches Geodätisches Forschungsinstitut, Technische Universität München (DGFI-TUM), Acrisstrasse 21, 80333 Munich, Germany
  • 3Technische Universität Dresden, Institut für Planetare Geodäsie, 1062 Dresden, Germany
  • 4Bundesamt für Kartographie und Geodäsie (BKG), Richard-Strauss-Allee 11, 60598 Frankfurt, Hessen, Germany

Abstract. The Gravity Recovery and Climate Experiment (GRACE) has delivered the most accurate quantification of global mass variations with monthly temporal resolution on large spatial scales. Future gravity missions will take advantage of improved measurement technologies such as enhanced orbit configurations and tracking systems as well as reduced temporal aliasing errors and latencies. In order to facilitate the usage of sub-monthly to daily innovate models, mass equivalent representations are computed. In addition, non-conventional processing techniques based on spherical radial basis functions (RBF) and mascons will give the ability to compute models in regional and global representations as well. The present study compares for the first time a complete global series of daily mass equivalent solutions obtained by the RBF method with conventional solutions in order to quantify recent ice-mass changes. We further compare the ice-induced crustal deformations due to the dynamic loading of the crustal layer with the Global Positioning System (GPS) uplift measurements along Greenland's coastline. Available mass change estimates based on ICESat (Ice, Cloud, and land Elevation Satellite) laser altimetry measurements both in Greenland and Antarctica are used to asses the GRACE results.

A comparison of GRACE time series with hydrological modeling for various basin extensions reveals overall high correlation to surface and groundwater storage compartments. The forward computation of satellite orbits for altimetry satellites such as Envisat, Jason-1 and Jason-2 compares the performance of GRACE time variable gravity fields with models including time variability, such as EIGEN-6S4.

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Christian Gruber et al.
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