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Open AccessArticle

Evaluating GRACE Mass Change Time Series for the Antarctic and Greenland Ice Sheet—Methods and Results

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Institut für Planetare Geodäsie, Technische Universität Dresden, 01062 Dresden, Germany
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Institut für Astronomische und Physikalische Geodäsie, Technische Universität München, 80333 München, Germany
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DTU Space, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
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Bristol Glaciology Centre, University of Bristol, Bristol BS8 1SS, UK
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Department of Geoscience and Remote Sensing, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
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School of Earth Sciences, The Ohio State University, Columbus, OH 43210-1398, USA
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Institute of Geodesy & Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
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Department of Space Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands
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Centre for Polar Observation and Modelling, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
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Author to whom correspondence should be addressed.
Current address: Institute for Marine and Atmospheric Research, Utrecht University, P.O. Box 80.005, 3508 TA Utrecht, The Netherlands and Department of Geoscience and Remote Sensing, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands.
Current address: Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China.
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Current address: Institute of Geophysics and PGMF, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Geosciences 2019, 9(10), 415; https://doi.org/10.3390/geosciences9100415
Received: 14 August 2019 / Revised: 16 September 2019 / Accepted: 17 September 2019 / Published: 25 September 2019
Satellite gravimetry data acquired by the Gravity Recovery and Climate Experiment (GRACE) allows to derive the temporal evolution in ice mass for both the Antarctic Ice Sheet (AIS) and the Greenland Ice Sheet (GIS). Various algorithms have been used in a wide range of studies to generate Gravimetric Mass Balance (GMB) products. Results from different studies may be affected by substantial differences in the processing, including the applied algorithm, the utilised background models and the time period under consideration. This study gives a detailed description of an assessment of the performance of GMB algorithms using actual GRACE monthly solutions for a prescribed period as well as synthetic data sets. The inter-comparison exercise was conducted in the scope of the European Space Agency’s Climate Change Initiative (CCI) project for the AIS and GIS, and was, for the first time, open to everyone. GMB products generated by different groups could be evaluated and directly compared against each other. For the period from 2003-02 to 2013-12, estimated linear trends in ice mass vary between −99 Gt/yr and −108 Gt/yr for the AIS and between −252 Gt/yr and −274 Gt/yr for the GIS, respectively. The spread between the solutions is larger if smaller drainage basins or gridded GMB products are considered. Finally, findings from the exercise formed the basis to select the algorithms used for the GMB product generation within the AIS and GIS CCI project. View Full-Text
Keywords: GRACE; ice mass change; Greenland; Antarctica; methods GRACE; ice mass change; Greenland; Antarctica; methods
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Groh, A.; Horwath, M.; Horvath, A.; Meister, R.; Sørensen, L.S.; Barletta, V.R.; Forsberg, R.; Wouters, B.; Ditmar, P.; Ran, J.; Klees, R.; Su, X.; Shang, K.; Guo, J.; Shum, C.K.; Schrama, E.; Shepherd, A. Evaluating GRACE Mass Change Time Series for the Antarctic and Greenland Ice Sheet—Methods and Results. Geosciences 2019, 9, 415.

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