Antarctica, Greenland and Gulf of Alaska land-ice evolution from an iterated GRACE global mascon solution

Luthcke, S. B.; Sabaka, Terence J.; Loomis, B. D.; Arendt, A. A.; McCarthy, John J.; Camp, Joanne

doi:10.3189/2013jog12j147

Cited by 372 publications

(426 citation statements)

References 66 publications

(115 reference statements)

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“…Leakage error in GRACE estimates can also be reduced by using high-resolution mascon solutions that are derived either directly from GRACE satellite range and range rate measurements (Rowlands et al 2005;Luthcke et al 2013) or from GRACE spherical harmonic solutions (Jacob et al 2012;Schrama et al 2014). Please note that forward modeling can be regarded as a mascon approach using GRACE spherical harmonic solutions and is solved in the spatial domain, as compared to the spherical harmonic domain (e.g., Jacob et al 2012).…”

Section: Uncertainties In Grace Tws Storage Changesmentioning

confidence: 99%

Groundwater Storage Changes: Present Status from GRACE Observations

et al. 2015

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Satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE) provide quantitative measurement of terrestrial water storage (TWS) changes with unprecedented accuracy. Combining GRACE-observed TWS changes and independent estimates of water change in soil and snow and surface reservoirs offers a means for estimating groundwater storage change. Since its launch in March 2002, GRACE time-variable gravity data have been successfully used to quantify long-term groundwater storage changes in different regions over the world, including northwest India, the High Plains Aquifer and the Central Valley in the USA, the North China Plain, Middle East, and southern Murray-Darling Basin in Australia, where groundwater storage has been significantly depleted in recent years (or decades). It is difficult to rely on in situ groundwater measurements for accurate quantification of large, regional-scale groundwater storage changes, especially at long timescales due to inadequate spatial and temporal coverage of in situ data and uncertainties in storage coefficients. The now nearly 13 years of GRACE gravity data provide a successful and unique complementary tool for monitoring and measuring groundwater changes on a global and regional basis. Despite the successful applications of GRACE in studying global groundwater storage change, there are still some major challenges limiting the application and interpretation of GRACE data. In this paper, we present an overview of GRACE applications in groundwater studies and discuss if and how the main challenges to using GRACE data can be addressed.

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Section: Uncertainties In Grace Tws Storage Changesmentioning

confidence: 99%

Groundwater Storage Changes: Present Status from GRACE Observations

et al. 2015

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“…Previous studies have shown large negative mass imbalances and significant elevation losses for the nAP (Ivins et al, 2011;Shepherd et al, 2012;Luthcke et al, 2013;Sasgen et al, 2013;McMillan et al, 2014). However, in general these studies have not resolved the spatial distribution of mass imbalance in detail.…”

Section: Introductionmentioning

confidence: 88%

“…Glacier basins 1a,4a,6a,and 12a;c Glacier basins 19,[21][22][23][24][25]26b,[27][28][29][30]and 31a;d Glacier basins 17,18,and 19;e Our mass balance estimate for the nAP region agrees well with recently published gravimetric values. Recent GRACEbased estimates that can be most easily compared with our study yield values of −27.5 ± 10 Gt a −1 (summing the mascons encompassing and adjacent to our study area) (Luthcke et al, 2013), and 26 ± 3 Gt a −1 for a larger GRACE mascon extending to 70 • S (Sasgen et al, 2013). Due to the low spatial resolution of the gravimetric measurement, both these GRACE-derived results inherently include portions of the Larsen C ice shelf and adjacent ice-covered islands we did not measure (notably, King George Island) that lost elevation and mass during the ICESat period (Gardner et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…A mapping of these patterns, over the entire region but at the glacier basin scale, can provide more insight into processes responsible for the ice loss. Studies based on gravitational change detection using the Gravity Recovery and Climate Experiment satellite system (GRACE) have an inherent spatial resolution of roughly 250 km scale (Ivins et al, 2011;Luthcke et al, 2013;Sasgen et al, 2013), far larger than the scale of the nAP individual glacier basins and islands. Past altimetry-based studies (Pritchard et al, 2009;Flament and Rémy, 2012;Shepherd et al, 2012;McMillan et al, 2014) suffer from either sparse coverage or slope correction issues, or both, due to the steep terrain in the nAP.…”

Section: Introductionmentioning

confidence: 99%

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Detailed ice loss pattern in the northern Antarctic Peninsula: widespread decline driven by ice front retreats

Scambos¹,

Berthier

Haran³

et al. 2014

The Cryosphere

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Abstract. The northern Antarctic Peninsula (nAP, < 66 • S) is one of the most rapidly changing glaciated regions on earth, yet the spatial patterns of its ice mass loss at the glacier basin scale have to date been poorly documented. We use satellite laser altimetry and satellite stereo-image topography spanning 2001-2010, but primarily 2003-2008, to map ice elevation change and infer mass changes for 33 glacier basins covering the mainland and most large islands in the nAP. Rates of ice volume and ice mass change are 27.7 ± 8.6 km 3 a −1 and 24.9±7.8 Gt a −1 , equal to −0.73 m a −1 w.e. for the study area. Mass loss is the highest for eastern glaciers affected by major ice shelf collapses in 1995 and 2002, where twelve glaciers account for 60 % of the total imbalance. However, losses at smaller rates occur throughout the nAP, at both high and low elevation, despite increased snow accumulation along the western coast and ridge crest. We interpret the widespread mass loss to be driven by decades of ice front retreats on both sides of the nAP, and extended throughout the ice sheet due to the propagation of kinematic waves triggered at the fronts into the interior.

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“…comm., 2014) of −144 ± 28 Gt/years for Greenland and −123 ± 28 Gt/years for Alaska are in closer and worse agreement, respectively. Luthcke et al (2013) used a GRACE mascon approach to infer total mass loss of −71 ± 11 Gt/years in Alaska and −226 ± 12 Gt/years for Greenland. Shepherd et al (2012) also inspected the Greenland ice sheet and estimated a mass loss of −142 ± 49 Gt/years which broadly matches our result.…”

Section: Mass Loss Estimatesmentioning

confidence: 99%

Secular changes in Earth’s shape and surface mass loading derived from combinations of reprocessed global GPS networks

Booker

Clarke

Lavallée

2014

J Geod

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The changing distribution of surface mass (oceans, atmospheric pressure, continental water storage, groundwater, lakes, snow and ice) causes detectable changes in the shape of the solid Earth, on time scales ranging from hours to millennia. Transient changes in the Earth's shape can, regardless of cause, be readily separated from steady secular variation in surface mass loading, but other secular changes due to plate tectonics and glacial isostatic adjustment (GIA) cannot. We estimate secular station velocities from almost 11 years of high quality combined GPS position solutions (GPS weeks 1,000-1,570) submitted as part of the first international global navigation satellite system service reprocessing campaign. Individual station velocities are estimated as a linear fit, paying careful attention to outliers and offsets. We remove a suite of a priori GIA models, each with an associated set of plate tectonic Euler vectors estimated by us; the latter are shown to be insensitive to the a priori GIA model. From the coordinate time series residuals after removing the GIA models and corresponding plate tectonic velocities, we use mass-conserving continental basis functions to estimate surface mass loading including the secular term. The different GIA models lead to significant differences in the estimates of loading in selected regions. Although our loading estimates are broadly comparable with independent estimates from other satellite missions, their range highlights the need for better, more robust GIA models that incorporate 3D Earth structure and accurately represent 3D surface displacements.

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Antarctica, Greenland and Gulf of Alaska land-ice evolution from an iterated GRACE global mascon solution

Abstract: ABSTRACT. We have determined the ice mass evolution of the Antarctic and Greenland ice sheets (AIS and GIS) and

Cited by 372 publications

References 66 publications

Groundwater Storage Changes: Present Status from GRACE Observations

Groundwater Storage Changes: Present Status from GRACE Observations

Detailed ice loss pattern in the northern Antarctic Peninsula: widespread decline driven by ice front retreats

Secular changes in Earth’s shape and surface mass loading derived from combinations of reprocessed global GPS networks

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