Use of GRACE determined secular gravity rates for glacial isostatic adjustment studies in North-America

Wal, Wouter van der; Wu, Patrick; Sideris, M. G.; Shum, C. K.

doi:10.1016/j.jog.2008.03.007

Cited by 48 publications

(47 citation statements)

References 42 publications

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“…This suggests that long-term trends from land surface models may not be fully trusted. Similar conclusions have been found in correcting for long-term hydrologic effects to study GIA signal using GRACE (Steffen et al 2009;Tregoning et al 2009;van der Wal et al 2008).…”

Section: Glacial Isostatic Adjustmentsupporting

confidence: 79%

Estimating geoid height change in North America: past, present and future

Jacob

Wahr

Gross

et al. 2011

J Geod

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The forthcoming GRAV-D gravimetric geoid model over the United States is to be updated regularly to account for changes in geoid height. Its baseline precision is to be at the 10-20 mm level over non-mountainous regions. The aim of this study is to provide an estimate of the magnitude, time scale, and spatial footprint of geoid height change over North America, from mass redistribution processes of hydrologic, cryospheric and solid Earth nature. Geoid height changes from continental water storage changes over the past 50 years and predicted over the next century are evaluated and are highly dependent on the used model. Groundwater depletion from anthropogenic pumping in regional scale aquifers may lead to geoid changes of 10 mm magnitude every 50-100 years. The GRACE time varying gravity fields are used to (i) assess the errors in a glacial isostatic adjustment model, which, if used to correct the GRAV-D model, may induce errors at the 10 mm geoid height level after ∼20 years, (ii), evaluate geoid height change over ice mass loss regions of North America, which, if they remain unchanged in the future, may lead to geoid height changes at the 10 mm level in under a decade and (iii), compute sea level rise and its effect on the geoid, which is found to be negligible. Coseismic gravitational changes from past North American earthquakes are evaluated, and lead to geoid change at the 10-mm level for only the largest thrust earthquakes. Finally, geoid change from volcanic processes are assessed and found to be significant with respect to the GRAV-D geoid model baseline precision for cataclysmic events, such as that of the 1980 Mt. St. Helens eruption. Recommendations on how to best monitor geoid change in the future are given.

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Section: Glacial Isostatic Adjustmentsupporting

confidence: 79%

Estimating geoid height change in North America: past, present and future

Jacob

Wahr

Gross

et al. 2011

J Geod

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“…In this context, a quite large number of investigations used GRACE data to determine variations caused by hydrological, cryospheric or oceanic effects (see e. g. Tapley et al, 2004;Velicogna and Wahr, 2005;Wahr et al, 2004;Famiglietti et al, 2005;Frappart et al, 2006;Han et al, 2005a;Chen et al, 2006;Schmidt et al, 2006;Seo et al, 2006;Swenson and Milly, 2006;Yeh et al, 2006;Crowley et al, 2007;Munekane, 2007). The number of GIA investigations with GRACE is rather small so far, but slowly increasing as the mission duration exceeds five years and advanced processing techniques now allow such investigations (see e. g. Rangelova et al, 2007;Tamisiea et al, 2007;Barletta et al, 2008;Rangelova et al, 2008;Steffen et al, 2008a,b;van der Wal et al, 2008).…”

Section: Processing Of the Grace Monthly Solutionsmentioning

confidence: 99%

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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“…Previous studies showed that significant temporal gravity field variations can be recovered from the GRACE monthly solutions, provided that adequate filters are employed (see e. g. Chambers et al, 2007;Crowley et al, 2007;Morison et al, 2007;Niu et al, 2007;Rangelova et al, 2007;Swenson and Wahr, 2007;Tamisiea et al, 2007;Barletta et al, 2008;Rangelova and Sideris, 2008;Steffen et al, 2008Steffen et al, , 2009avan der Wal et al, 2008). Independent studies focusing on a specific region of interest, however, resulted in different estimations of mass variations.…”

Section: Introductionmentioning

confidence: 99%

Significance of secular trends of mass variations determined from GRACE solutions

Steffen

Petrović

Müller

et al. 2009

Journal of Geodynamics

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Since 2002 the Earth's gravity field is globally observed by the Gravity Recovery and Climate Experiment (GRACE) satellite mission. The GRACE monthly gravity field solutions, available from several analysis centres, reflect mass variations in the atmosphere, hydrosphere and geosphere. Due to correlated noise contained in these solutions, it is, however, first necessary to apply an appropriate filtering technique. The resulting, smoothed time attempted. The differences among the trends resulting from different models illustrate that the state-of-the art hydrology models are not suitable for this purpose as yet. Consequently, taking the GRACE monthly gravity field solutions from one centre, choosing a single filter and applying an insufficiently reliable reduction model leads sometimes to a misinterpretation of considered geophysical processes. Therefore, one has to be cautious with the final interpretation of the results.

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Use of GRACE determined secular gravity rates for glacial isostatic adjustment studies in North-America

Cited by 48 publications

References 42 publications

Estimating geoid height change in North America: past, present and future

Estimating geoid height change in North America: past, present and future

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

Significance of secular trends of mass variations determined from GRACE solutions

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