Bradley, S.L. and Hindmarsh, R.C.A. and Whitehouse, P.L. and Bentley, M.J. and King, M.A. (2015) 'Low post-glacial rebound rates in the Weddell Sea due to Late Holocene ice-sheet readvance.', Earth and planetary science letters., 413 . pp. 79-89.
Many ice-sheet reconstructions assume monotonic Holocene retreat for the West Antarctic Ice Sheet, but an increasing number of glaciological observations infer that some portions of the ice sheet may be readvancing, following retreat behind the present-day margin. A readvance in the Weddell Sea region can reconcile two outstanding problems: (i) the present-day widespread occurrence of seemingly stable ice streams grounded on beds that deepen inland; and (ii) the inability of models of glacial isostatic adjustment to match present-day uplift rates. By combining a suite of ice loading histories that include a readvance with a model of glacial isostatic adjustment we report substantial improvements to predictions of present-day uplift rates, including reconciling one problematic observation of land sinking. We suggest retreat behind present grounding lines occurred when the bed was lower, and isostatic recovery has since led to shallowing, ice sheet re-grounding and readvance. The paradoxical existence of grounding lines in apparently unstable configurations on reverse bed slopes may be resolved by invoking the process of unstable advance, in accordance with our load modelling.
|Keywords:||Grounding line stability, Antarctic Ice sheet, Glacial isostatic adjustment, Uplift rate, Weddell Sea, Deglaciation.|
|Full text:||(AM) Accepted Manuscript|
Download PDF (4314Kb)
|Full text:||(VoR) Version of Record|
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
Download PDF (3310Kb)
|Publisher Web site:||http://dx.doi.org/10.1016/j.epsl.2014.12.039|
|Publisher statement:||© 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)|
|Date accepted:||17 December 2014|
|Date deposited:||15 January 2015|
|Date of first online publication:||16 January 2015|
|Date first made open access:||No date available|
Save or Share this output
|Look up in GoogleScholar|