A constitutive framework for predicting weakening and reduced buttressing of ice shelves based on observations of the progressive deterioration of the remnant Larsen B Ice Shelf

The increasing contribution of the Antarctic Ice Sheet to sea level rise is linked to reductions in ice shelf buttressing, driven in large part by basal melting of ice shelves. These ocean‐driven buttressing losses are being compounded as ice shelves weaken and fracture. To date, model projections o...

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Bibliographic Details
Published in:Geophysical research letters 2016-03, Vol.43 (5), p.2027-2035
Main Authors: Borstad, Chris, Khazendar, Ala, Scheuchl, Bernd, Morlighem, Mathieu, Larour, Eric, Rignot, Eric
Format: Article
Language:English
Subjects:
Antarctic ice
Antarctic ice sheet
Buttresses
Collapse
damage mechanics
Deformation
Degradation
Deterioration
Evolution
Frameworks
Geophysics
Glaciation
glaciology
Ice
Ice calving
Ice sheets
ice shelf buttressing
Ice shelves
Iceberg calving
Icebergs
Land ice
Marine
Mathematical models
Melting
Meltwater
Predictions
Sea level
Sea level rise
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Summary:The increasing contribution of the Antarctic Ice Sheet to sea level rise is linked to reductions in ice shelf buttressing, driven in large part by basal melting of ice shelves. These ocean‐driven buttressing losses are being compounded as ice shelves weaken and fracture. To date, model projections of ice sheet evolution have not accounted for weakening ice shelves. Here we present the first constitutive framework for ice deformation that explicitly includes mechanical weakening, based on observations of the progressive degradation of the remnant Larsen B Ice Shelf from 2000 to 2015. We implement this framework in an ice sheet model and are able to reproduce most of the observed weakening of the ice shelf. In addition to predicting ice shelf weakening and reduced buttressing, this new framework opens the door for improved understanding and predictions of iceberg calving, meltwater routing and hydrofracture, and ice shelf collapse. Key Points Assimilated observations indicate progressive weakening of ice shelf from 2000 to 2015 New framework introduced for viscous ice deformation with analytical solution for damage New framework reproduces observed weakening and is generalizable to any ice shelf
ISSN:0094-8276
1944-8007
DOI:10.1002/2015GL067365