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| Titel |
Sensitivity of the Weddell Sea sector ice streams to sub-shelf melting and surface accumulation |
| VerfasserIn |
A. P. Wright, A. M. Le Brocq, S. L. Cornford, R. G. Bingham, H. F. J. Corr, F. Ferraccioli, T. A. Jordan, A. J. Payne, D. M. Rippin, N. Ross, M. J. Siegert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 6 ; Nr. 8, no. 6 (2014-11-24), S.2119-2134 |
| Datensatznummer |
250116379
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| Publikation (Nr.) |
 copernicus.org/tc-8-2119-2014.pdf |
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| Zusammenfassung |
| 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. |
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