Reference : Simulation of the time-variable gravity field by means of coupled geophysical models
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/1674
Simulation of the time-variable gravity field by means of coupled geophysical models
English
Gruber, Th mailto [Institute of Astronomical and Physical Geodesy, Technical University Munich, Munich, Germany]
Bamber, J. L. mailto [Bristol Glaciology Centre, University of Bristol, Bristol, UK]
Bierkens, M. F. P. mailto [Department of Physical Geography, Utrecht University, Utrecht, The Netherlands]
Dobslaw, H. mailto [Deutsches GeoForschungsZentrum Potsdam, Potsdam, Germany]
Murböck, M. mailto [Institute of Astronomical and Physical Geodesy, Technical University Munich, Munich, Germany]
Thomas, M. mailto [Delft Institute of Earth Observation and Space Systems, Delft University of Technology, Delft,The Netherlands]
van Beek, L. P. H. mailto [Department of Physical Geography, Utrecht University, Utrecht, The Netherlands]
van Dam, Tonie mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Vermeersen, L. L. A. mailto [Delft Institute of Earth Observation and Space Systems, Delft University of Technology, Delft,The Netherlands]
Visser, P.N.A.M. mailto [Delft Institute of Earth Observation and Space Systems, Delft University of Technology, Delft,The Netherlands]
2011
Earth System Science Data
Copernicus Publications
3
1
19-35
Yes
International
1866-3591
1866-3516
Göttingen
Germany
[en] mass transport ; satellite gravity
[en] Time variable gravity fields, reflecting variations of mass distribution in the system Earth is one of the key parameters to understand the changing Earth. Mass variations are caused either by redistribution of mass in, on or above the Earth's surface or by geophysical processes in the Earth's interior. The first set of observations of monthly variations of the Earth gravity field was provided by the US/German GRACE satellite mission beginning in 2002. This mission is still providing valuable information to the science community. However, as GRACE has outlived its expected lifetime, the geoscience community is currently seeking successor missions in order to maintain the long time series of climate change that was begun by GRACE. Several studies on science requirements and technical feasibility have been conducted in the recent years. These studies required a realistic model of the time variable gravity field in order to perform simulation studies on sensitivity of satellites and their instrumentation. This was the primary reason for the European Space Agency (ESA) to initiate a study on ''Monitoring and Modelling individual Sources of Mass Distribution and Transport in the Earth System by Means of Satellites''. The goal of this interdisciplinary study was to create as realistic as possible simulated time variable gravity fields based on coupled geophysical models, which could be used in the simulation processes in a controlled environment. For this purpose global atmosphere, ocean, continental hydrology and ice models were used. The coupling was performed by using consistent forcing throughout the models and by including water flow between the different domains of the Earth system. In addition gravity field changes due to solid Earth processes like continuous glacial isostatic adjustment (GIA) and a sudden earthquake with co-seismic and post-seismic signals were modelled. All individual model results were combined and converted to gravity field spherical harmonic series, which is the quantity commonly used to describe the Earth's global gravity field. The result of this study is a twelve-year time-series of 6-hourly time variable gravity field spherical harmonics up to degree and order 180 corresponding to a global spatial resolution of 1 degree in latitude and longitude. In this paper, we outline the input data sets and the process of combining these data sets into a coherent model of temporal gravity field changes. The resulting time series was used in some follow-on studies and is available to anybody interested.
European Space Agency - ESA
Researchers
http://hdl.handle.net/10993/1674
also: http://hdl.handle.net/10993/2258
10.5194/essd-3-19-2011
http://www.earth-syst-sci-data.net/3/19/2011/

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