Antarctic contribution to sea level rise observed by GRACE with improved GIA correction
Erik R. Ivins,Thomas S. James,Thomas S. James,John Wahr,Ernst Schrama,Felix W. Landerer,Karen Simon,Karen Simon +7 more
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TLDR
In this article, an ice sheet history model is used to predict the glacial isostatic adjustment (GIA) signal in the past 21 thousand years, and the GIA contribution to the apparent surface mass change is evaluated to be +55±13 Gt/yr by considering a revised ice history model.Abstract:
Antarctic volume changes during the past 21 thousand years are smaller than previously thought, and here we construct an ice sheet history that drives a forward model prediction of the glacial isostatic adjustment (GIA) gravity signal. The new model, in turn, should give predictions that are constrained with recent uplift data. The impact of the GIA signal on a Gravity Recovery and Climate Experiment (GRACE) Antarctic mass balance estimate depends on the specific GRACE analysis method used. For the method described in this paper, the GIA contribution to the apparent surface mass change is re-evaluated to be +55±13 Gt/yr by considering a revised ice history model and a parameter search for vertical motion predictions that best fit the GPS observations at 18 high-quality stations. Although the GIA model spans a range of possible Earth rheological structure values, the data are not yet sufficient for solving for a preferred value of upper and lower mantle viscosity nor for a preferred lithospheric thickness. GRACE monthly solutions from the Center for Space Research Release 04 (CSR-RL04) release time series from January 2003 to the beginning of January 2012, uncorrected for GIA, yield an ice mass rate of +2.9± 29 Gt/yr. The new GIA correction increases the solved-for ice mass imbalance of Antarctica to ?57±34 Gt/yr. The revised GIA correction is smaller than past GRACE estimates by about 50 to 90 Gt/yr. The new upper bound to the sea level rise from the Antarctic ice sheet, averaged over the time span 2003.0–2012.0, is about 0.16±0.09 mm/yr.read more
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Emerging trends in global freshwater availability.
Matthew Rodell,James S. Famiglietti,James S. Famiglietti,David N. Wiese,John T. Reager,Hiroko Kato Beaudoing,Hiroko Kato Beaudoing,Felix W. Landerer,Min-Hui Lo +8 more
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Space geodesy constrains ice age terminal deglaciation: The global ICE‐6G_C (VM5a) model
TL;DR: In this paper, a new model of the last deglaciation event of the Late Quaternary ice age is described and denoted as ICE-6G_C (VM5a), which has been explicitly refined by applying all of the available Global Positioning System (GPS) measurements of vertical motion of the crust that may be brought to bear to constrain the thickness of local ice cover as well as the timing of its removal.
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Improved methods for observing Earth's time variable mass distribution with GRACE using spherical cap mascons
TL;DR: The mascon basis functions allow for convenient application of a priori information derived from near-global geophysical models to prevent striping in the solutions, and do not necessitate empirical filters to remove north-south stripes, lowering the dependence on using scale factors as discussed by the authors.
Journal ArticleDOI
Mass balance of the Antarctic ice sheet from 1992 to 2017.
Andrew Shepherd,Erik R. Ivins,Eric Rignot,Ben Smith,Michiel R. van den Broeke,Isabella Velicogna,Pippa L. Whitehouse,Kate Briggs,Ian Joughin,Gerhard Krinner,Sophie Nowicki,Tony Payne,Ted Scambos,Nicole Schlegel,Geruo A,Cécile Agosta,Andreas P. Ahlstrøm,Greg Babonis,Valentina R. Barletta,Alejandro Blazquez,Jennifer Bonin,Beata Csatho,Richard I. Cullather,Denis Felikson,Xavier Fettweis,René Forsberg,Hubert Gallée,Alex S. Gardner,Lin Gilbert,Andreas Groh,Brian Gunter,Edward Hanna,Christopher Harig,Veit Helm,Alexander Horvath,Martin Horwath,Shfaqat Abbas Khan,Kristian K. Kjeldsen,Hannes Konrad,Peter L. Langen,Benoit S. Lecavalier,Bryant D. Loomis,Scott B. Luthcke,Malcolm McMillan,Daniele Melini,Sebastian H. Mernild,Sebastian H. Mernild,Sebastian H. Mernild,Yara Mohajerani,Philip Moore,Jeremie Mouginot,Jeremie Mouginot,Gorka Moyano,Alan Muir,Thomas Nagler,Grace A. Nield,Johan Nilsson,Brice Noël,Ines Otosaka,Mark E. Pattle,W. Richard Peltier,Nadege Pie,Roelof Rietbroek,Helmut Rott,Louise Sandberg-Sørensen,Ingo Sasgen,Himanshu Save,Bernd Scheuchl,Ernst Schrama,Ludwig Schröder,Ki-Weon Seo,Sebastian B. Simonsen,Thomas Slater,Giorgio Spada,T. C. Sutterley,Matthieu Talpe,Lev Tarasov,Willem Jan van de Berg,Wouter van der Wal,Melchior van Wessem,Bramha Dutt Vishwakarma,David N. Wiese,Bert Wouters +82 more
TL;DR: This work combines satellite observations of its changing volume, flow and gravitational attraction with modelling of its surface mass balance to show that the Antarctic Ice Sheet lost 2,720 ± 1,390 billion tonnes of ice between 1992 and 2017, which corresponds to an increase in mean sea level of 7.6‚¬3.9 millimetres.
Journal ArticleDOI
Computations of the viscoelastic response of a 3-D compressible Earth to surface loading: an application to Glacial Isostatic Adjustment in Antarctica and Canada
Geruo A,John Wahr,Shijie Zhong +2 more
TL;DR: In this paper, a 3D finite-element model is developed to study the viscoelastic response of a compressible Earth to surface loads, and the effects of center of mass motion, polar wander feedback, and selfconsistent ocean loading are implemented.
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