Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation

Andew P Wright, Anne Le Brocq, Stephen L Cornford, Robert G Bingham, Hugh F. J. Corr, Fausto Ferraccioli, Tom A. Jordan, A J Payne, David M Rippin, Neil Ross, Martin J Siegert

Research output: Contribution to journalArticle (Academic Journal)peer-review

28 Citations (Scopus)
354 Downloads (Pure)

Abstract

A recent ocean modelling study indicates that possible changes in circulation may bring warm deep-ocean water into direct contact with the grounding lines of the Filchner–Ronne ice streams, suggesting the potential for future ice losses from this sector equivalent to ~0.3 m of sea-level rise. Significant advancements have been made in our knowledge of both the basal topography and ice velocity in the Weddell Sea sector, and the ability to accurately model marine ice sheet dynamics, thus enabling an assessment to be made of the relative sensitivities of the diverse collection of ice streams feeding the Filchner–Ronne Ice Shelf. Here we use the BISICLES ice sheet model, which employs adaptive-mesh refinement to resolve grounding line dynamics, to carry out such an assessment. The impact of realistic perturbations to the surface and sub-shelf mass balance forcing fields from our 2000-year "reference" model run indicate that both the Institute and Möller ice streams are highly sensitive to changes in basal melting either near to their respective grounding lines, or in the region of the ice rises within the Filchner–Ronne Ice Shelf. These same perturbations have little impact, however, on the Rutford, Carlson or Foundation ice streams, while the Evans Ice Stream is found to enter a phase of unstable retreat only after melt at its grounding line has increased by 50% of likely present-day values.
Original languageEnglish
Pages (from-to)2119-2134
Number of pages16
JournalCryosphere
Volume8
Issue number6
Early online date24 Nov 2014
DOIs
Publication statusPublished - Nov 2014

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