Glacial Isostatic Adjustment over Antarctica from combined ICESat and GRACE satellite data

Riva, Riccardo; Gunter, B. C.; Urban, T.; Vermeersen, Bert; Lindenbergh, Roderik; Helsen, M. M.; Bamber, Jonathan; Wal, R. S. W. van de; Broeke, M. R. van den; Schutz, B. E.

doi:10.1016/j.epsl.2009.10.013

Cited by 143 publications

(156 citation statements)

References 37 publications

Supporting

Mentioning

152

Contrasting

Order By: Relevance

“…The LCO is caused by the mixing of fresh, recently formed organic matter (formed mainly by diatoms) with reworked, fossil organic matter (e.g. Licht et al, 1996;Andrews et al, 1999;Pudsey et al, 2006;Ohkouchi and Eglinton, 2008;Rosenheim et al, 2008;Hillenbrand et al, 2010). At core sites, for which 14 C dates from calcareous material were unavailable, we assumed that the surface sediments are of modern age.…”

Section: Methodsmentioning

confidence: 99%

“…(w10 mg) picked from 1 to 2 cm thick sediment slices, because these 14 C dates provide the most reliable radiocarbon ages (e.g. Domack et al, 2005;Heroy and Anderson, 2007;Rosenheim et al, 2008). All other 14 C ages were obtained by dating the acid-insoluble organic fraction (AIO) of bulk sediment samples (cf.…”

Section: Methodsmentioning

confidence: 99%

“…9 in Ó Cofaigh et al, 2005b). Additionally, modern uplift rates and crustal uplift in the direct hinterland of Belgica Trough seem to be the highest in the whole of Antarctica and suggest significant glacial isostatic adjustment of this area (Ivins and James, 2005;Riva et al, 2009). All these observations are consistent with a rather unique glacial history of the southern Bellingshausen Sea shelf and its hinterland and with a continuous, prolonged ice-sheet retreat as it is indicated by our chronology (Fig.…”

Section: History Of Ice-sheet Retreatmentioning

confidence: 99%

“…This is because the underlying terrigenous transitional sediments deposited more proximal to the retreating grounding line usually lack calcareous microfossils, while the organic carbon contents in these transitional sediments are subject to significant contamination with subglacially reworked, fossil organic matter (e.g. Domack, 1992;Domack et al, 1999;Heroy and Anderson, 2007;Rosenheim et al, 2008;Hillenbrand et al, 2010). In ageedepth profiles for sediment cores, this higher degree of down-core contamination is visible as a pronounced kink, sometimes referred to as a "dog leg" (Fig.…”

Section: History Of Ice-sheet Retreatmentioning

confidence: 99%

“…More sophisticated techniques of radiocarbon dating, such as compoundspecific AMS 14 C dating of the organic matter (e.g. Ingalls et al, 2004;Hatté et al, 2008;Ohkouchi and Eglinton, 2008;Rosenheim et al, 2008), are required to test these hypotheses.…”

Section: Open Questionsmentioning

confidence: 99%

See 4 more Smart Citations

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Hillenbrand

Larter

Dowdeswell

et al. 2010

Quaternary Science Reviews

View full text Add to dashboard Cite

a b s t r a c tA major trough ("Belgica Trough") eroded by a palaeo-ice stream crosses the continental shelf of the southern Bellingshausen Sea (West Antarctica) and is associated with a trough mouth fan ("Belgica TMF") on the adjacent continental slope. Previous marine geophysical and geological studies investigated the bathymetry and geomorphology of Belgica Trough and Belgica TMF, erosional and depositional processes associated with bedform formation, and the temporal and spatial changes in clay mineral provenance of subglacial and glaciomarine sediments.Here, we present multi-proxy data from sediment cores recovered from the shelf and uppermost slope in the southern Bellingshausen Sea and reconstruct the ice-sheet history since the last glacial maximum (LGM) in this poorly studied area of West Antarctica. We combined new data (physical properties, sedimentary structures, geochemical and grain-size data) with published data (shear strength, clay mineral assemblages) to refine a previous facies classification for the sediments. The multi-proxy approach allowed us to distinguish four main facies types and to assign them to the following depositional settings: 1) subglacial, 2) proximal grounding-line, 3) distal sub-ice shelf/sub-sea ice, and 4) seasonal open-marine. In the seasonal open-marine facies we found evidence for episodic currentinduced winnowing of near-seabed sediments on the middle to outer shelf and at the uppermost slope during the late Holocene.In addition, we obtained data on excess 210 Pb activity at three core sites and 44 AMS 14 C dates from the acid-insoluble fraction of organic matter (AIO) and calcareous (micro-) fossils, respectively, at 12 sites. These chronological data enabled us to reconstruct, for the first time, the timing of the last advance and retreat of the West Antarctic Ice Sheet (WAIS) and the Antarctic Peninsula Ice Sheet (APIS) in the southern Bellingshausen Sea. We used the down-core variability in sediment provenance inferred from clay mineral changes to identify the most reliable AIO 14 C ages for ice-sheet retreat. The palaeo-ice stream advanced through Belgica Trough after w36.0 corrected 14 C ka before present (B.P.). It retreated from the outer shelf at w25.5 ka B.P., the middle shelf at w19.8 ka B.P., the inner shelf in Eltanin Bay at w12.3 ka B.P., and the inner shelf in Ronne Entrance at w6.3 ka B.P. The retreat of the WAIS and APIS occurred slowly and stepwise, and may still be in progress. This dynamical ice-sheet behaviour has to be taken into account for the interpretation of recent and the prediction of future mass-balance changes in the study area. The glacial history of the southern Bellingshausen Sea is unique when compared to other regions in West Antarctica, but some open questions regarding its chronology need to be addressed by future work.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: History Of Ice-sheet Retreatmentioning

confidence: 99%

Section: History Of Ice-sheet Retreatmentioning

confidence: 99%

Section: Open Questionsmentioning

confidence: 99%

See 3 more Smart Citations

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Hillenbrand

Larter

Dowdeswell

et al. 2010

Quaternary Science Reviews

View full text Add to dashboard Cite

show abstract

Late Quaternary glacial history constrains glacio-isostatic rebound in Enderby Land, East Antarctica

White

Fink

2014

J. Geophys. Res. Earth Surf.

View full text Add to dashboard Cite

Measurements of the loss or gain of ice mass from large ice sheets are presently achieved through satellite-based techniques such as GRACE (Gravity Recovery and Climate Experiment). The accuracy of these satellite-based measurements to changes in modern ice sheet mass depends on our knowledge of present-day glacio-isostatic crustal uplift rates caused by past ice sheet changes. To improve models of glacio-isostatic rebound in East Antarctica, we investigated ice histories along Rayner Glacier, Enderby Land, and a little explored sector of the ice sheet where GRACE data had suggested significant mass gain during the last decade. Observations from a recent glacial geomorphic reconnaissance coupled with cosmogenic nuclide dating indicate that in the lower part of the Rayner Glacier, Enderby Land, ice heights lowered by at least 300 m and the calving margin retreated by at least 10 km in the early Holocene (~6 to 9 ka B.P.). The magnitude and timing of deglaciation are consistent with ice histories used to model the postglacial rebound corrections for present-day GRACE mass trends. These observations strengthen the body of evidence that suggests ice mass gain in Enderby Land is presently partly offsetting mass loss in other parts of Antarctica.

show abstract

Monthly gravity field models derived from GRACE Level 1B data using a modified short‐arc approach

et al. 2015

View full text Add to dashboard Cite

In this study, a new time series of Gravity Recovery and Climate Experiment (GRACE) monthly solutions, complete to degree and order 60 spanning from January 2003 to August 2011, has been derived based on a modified short-arc approach. Our models entitled Tongji-GRACE01 are available on the website of International Centre for Global Earth Models (http://icgem.gfz-potsdam.de/ICGEM/). The traditional short-arc approach, with no more than 1 h arcs, requires the gradient corrections of satellite orbits in order to reduce the impact of orbit errors on the final solution. Here the modified short-arc approach has been proposed, which has three major differences compared to the traditional one: (1) All the corrections of orbits and range rate measurements are solved together with the geopotential coefficients and the accelerometer biases using a weighted least squares adjustment; (2) the boundary position parameters are not required; and (3) the arc length can be extended to 2 h. The comparisons of geoid degree powers and the mass change signals in the Amazon basin, the Antarctic, and Antarctic Peninsula demonstrate that our model is comparable with the other existing models, i.e., the Centre for Space Research RL05, Jet Propulsion Laboratory RL05, and GeoForschungsZentrum RL05a models. The correlation coefficients of the mass change time series between our model and the other models are better than 0.9 in the Antarctic and Antarctic Peninsula. The mass change rates in the Antarctic and Antarctic Peninsula derived from our model are À92.7 ± 38.0 Gt/yr and À23.9 ± 12.4 Gt/yr, respectively, which are very close to those from other three models and with similar spatial patterns of signals.

show abstract

Glacial Isostatic Adjustment over Antarctica from combined ICESat and GRACE satellite data

Cited by 143 publications

References 37 publications

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary

Late Quaternary glacial history constrains glacio-isostatic rebound in Enderby Land, East Antarctica

Monthly gravity field models derived from GRACE Level 1B data using a modified short‐arc approach

Contact Info

Product

Resources

About