Gravity Changes in Northern Europe as Observed by GRACE

Müller, Jürgen; Neumann-Redlin, M.; Jarecki, F.; Denker, Heiner; Gitlein, Olga

doi:10.1007/978-3-540-49350-1_76

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…In addition, tests were performed with more and less smoothing, e. g. a 500 km Gaussian filter was compared to a destriping filter with an additional 300 km Gaussian filter, resulting in only minor changes of the recovered land uplift signal. Furthermore, previous results with larger smoothing radii (500 km, 800 km and 1000 km) are documented in Müller et al (2005Müller et al ( , 2006a.…”

Section: Processing Of the Grace Monthly Solutionsmentioning

confidence: 51%

“…Regarding GIA in Fennoscandia, estimates show that a temporal gravity change of -10µGal at the Earth's surface and +5 µGal at a fixed reference point in space can be expected (associated with about ∼ 3 mm geoid change) in the Bothnian Bay over five years (Müller et al, 2006a). As GRACE is already more than five years in orbit and a mission extension for at least two more years is approved, the Fennoscandian land uplift area gives an excellent opportunity to validate different observation techniques.…”

Section: Processing Of the Grace Monthly Solutionsmentioning

confidence: 99%

“…Compared to former studies (Müller et al, 2005(Müller et al, , 2006a, the separation of the individual signal parts is still a challenging task, but the longer time span of the GRACE observations and better reduction models for the satellite data facilitate the investigation of GIA-induced mass variations. A comparison of the GRACE results with terrestrial data, such as absolute gravity measurements (Gitlein et al, 2008), may help in the future to discriminate between different GRACE solutions as well as different assumptions and parameters in the geophysical uplift modelling.…”

Section: D Models)mentioning

confidence: 99%

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Glacial isostatic adjustment in Fennoscandia from GRACE data and comparison with geodynamical models

Steffen

Denker

Müller

2008

Journal of Geodynamics

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The Earth's gravity field observed by the Gravity Recovery and Climate Experiment (GRACE) satellite mission shows variations due to the integral effect of mass variations in the atmosphere, hydrosphere and geosphere. Several institutions, such as the GeoForschungsZentrum (GFZ) Potsdam, the University of Texas at Austin, Center for Space Research (CSR) and the Jet Propulsion Laboratory (JPL), Pasadena, provide GRACE monthly solutions, which differ slightly due to the application of different reduction models and centre-specific processing schemes. The GRACE data are used to investigate the mass variations in Fennoscandia, an area which is strongly influenced by glacial isostatic adjustment (GIA). Hence the focus is set on the computation of secular trends. Different filters (e. g. isotropic and nonisotropic filters) are discussed for the removal of high frequency noise to permit the extraction of the GIA signal. The resulting GRACE based mass variations are compared to global hydrology models (WGHM, LaDWorld) in order to (a) separate possible hydrological signals and (b) validate the hydrology models with regard to long period and secular components. In addition, a pattern matching algorithm is applied to localise the uplift centre, and finally the GRACE signal is compared with the results from a geodynamical modelling. are not GIA-induced, and also not explainable by the hydrology models. This may indicate that the recent global hydrology models have to be revised with respect to long period and secular components. Finally, the GRACE uplift signal is also in quite good agreement with the results from a simple geodynamical modelling.

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Section: Processing Of the Grace Monthly Solutionsmentioning

confidence: 51%

Section: Processing Of the Grace Monthly Solutionsmentioning

confidence: 99%

Section: D Models)mentioning

confidence: 99%

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Glacial isostatic adjustment in Fennoscandia from GRACE data and comparison with geodynamical models

Steffen

Denker

Müller

2008

Journal of Geodynamics

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“…Wahr and Velicogna, 2003;Peltier, 2004;Tamisiea et al, 2007). The gravity satellites GRACE and GOCE are providing, or will provide, additional global and regional constraints on the gravity field (Pagiatakis and Salib, 2003;Müller et al, 2006). Recent studies have demonstrated that the GRACE data clearly show temporal gravity variations both in Fennoscandia and North America (Tamisiea et al, 2007;Ivins and Wolf, 2008;Steffen et al, 2008).…”

Section: Geodetic Observationsmentioning

confidence: 96%

DynaQlim – Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas

Poutanen

Dransch

Gregersen

et al. 2009

New Frontiers in Integrated Solid Earth Sciences

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The isostatic adjustment of the solid Earth to the glacial loading (GIA, Glacial Isostatic Adjustment) with its temporal signature offers a great opportunity to retrieve information of Earth's upper mantle to the changing mass of glaciers and ice sheets, which in turn is driven by variations in Quaternary climate. DynaQlim (Upper Mantle Dynamics and Quaternary Climate in Cratonic Areas) has its focus to study the relations between upper mantle dynamics, its composition and physical properties, temperature, rheology, and Quaternary climate. Its regional focus lies on the cratonic areas of northern Canada and Scandinavia.Geodetic methods like repeated precise levelling, tide gauges, high-resolution observations of recent movements, gravity change and monitoring of postglacial faults have given information on the GIA process for more than 100 years. They are accompanied by more recent techniques like GPS observations and the GRACE and GOCE satellite missions which provide additional global and regional constraints on the gravity field. Combining geodetic observations with seismological investigations, studies of the postglacial faults and continuum mechanical modelling of GIA, DynaQlim offers new insights into properties of the lithosphere. Another step toward a better understanding of GIA has been the joint inversion of different types of observational data -preferentially connected with geological relative sea-level evidence of the Earth's rebound during the last 10,000 years.Due to the changes in the lithospheric stress state large faults ruptured violently at the end of the last M. Poutanen ( ) Finnish Geodetic Institute, Geodeetinrinne 2, 02430 Masala, Finland e-mail: markku.poutanen@fgi.fi glaciation in large earthquakes, up to the magnitudes M W = 7-8. Whether the rebound stress is still able to trigger a significant fraction of intraplate seismic events in these regions is not completely understood due to the complexity and spatial heterogeneity of the regional stress field. Understanding of this mechanism is of societal importance.Glacial ice sheet dynamics are constrained by the coupled process of the deformation of the viscoelastic solid Earth, the ocean and climate variability. Exactly how the climate and oceans reorganize to sustain growth of ice sheets that ground to continents and shallow continental shelves is poorly understood. Incorporation of nonlinear feedback in modelling both ocean heat transport systems and atmospheric CO 2 is a major challenge. Climate-related loading cycles and episodes are expected to be important, hence also more shortterm features of palaeoclimate should be explicitly treated.

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“…For Fennoscandia, there are several studies by the Institute of Geodesy in Hannover, which will be summarized below. Müller et al (2006a) presented their first GIA analysis from 32 CSR monthly solutions of GRACE release RL02 and showed that the peak is located east of the Gulf of Bothnia with a magnitude around 1 Gal/a. Since the location of the peak differs from those observed in Fennoscandian uplift models, they tried to improve the fit by reducing hydrological influences based on a global hydrology model.…”

Section: Gravity Recovery and Climate Experiments (Grace) And Follow-umentioning

confidence: 99%