Antarctic ice sheet response to sudden and sustained ice-shelf collapse (ABUMIP)

Antarctica's ice shelves modulate the grounded ice flow, and weakening of ice shelves due to climate forcing will decrease their ‘buttressing’ effect, causing a response in the grounded ice. While the processes governing ice-shelf weakening are complex, uncertainties in the response of the grou...

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Vydáno v:Journal of glaciology Ročník 66; číslo 260; s. 891 - 904
Hlavní autoři: Sun, Sainan, Pattyn, Frank, Simon, Erika G., Albrecht, Torsten, Cornford, Stephen, Calov, Reinhard, Dumas, Christophe, Gillet-Chaulet, Fabien, Goelzer, Heiko, Golledge, Nicholas R., Greve, Ralf, Hoffman, Matthew J., Humbert, Angelika, Kazmierczak, Elise, Kleiner, Thomas, Leguy, Gunter R., Lipscomb, William H., Martin, Daniel, Morlighem, Mathieu, Nowicki, Sophie, Pollard, David, Price, Stephen, Quiquet, Aurélien, Seroussi, Hélène, Schlemm, Tanja, Sutter, Johannes, van de Wal, Roderik S. W., Winkelmann, Ricarda, Zhang, Tong
Médium: Journal Article
Jazyk:angličtina
Vydáno: Cambridge, UK Cambridge University Press 01.12.2020
International Glaciological Society
Témata:
21st century
Antarctic glaciology
Antarctic ice sheet
Buttresses
Collapse
Continental interfaces, environment
Cryosphere
Destabilization
Experiments
Gaging
Glaciation
Ice
Ice sheet models
Ice sheets
Ice shelves
ice-sheet modelling
Intercomparison
Land ice
Ocean circulation
Ocean, Atmosphere
open climate campaign
Polar environments
Sciences of the Universe
Sea level
Sea level rise
Sheet modelling
Antarctica
ice-sheet modelling
Antarctic glaciology
ice shelves
ISSN:0022-1430, 1727-5652
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Shrnutí:Antarctica's ice shelves modulate the grounded ice flow, and weakening of ice shelves due to climate forcing will decrease their ‘buttressing’ effect, causing a response in the grounded ice. While the processes governing ice-shelf weakening are complex, uncertainties in the response of the grounded ice sheet are also difficult to assess. The Antarctic BUttressing Model Intercomparison Project (ABUMIP) compares ice-sheet model responses to decrease in buttressing by investigating the ‘end-member’ scenario of total and sustained loss of ice shelves. Although unrealistic, this scenario enables gauging the sensitivity of an ensemble of 15 ice-sheet models to a total loss of buttressing, hence exhibiting the full potential of marine ice-sheet instability. All models predict that this scenario leads to multi-metre (1–12 m) sea-level rise over 500 years from present day. West Antarctic ice sheet collapse alone leads to a 1.91–5.08 m sea-level rise due to the marine ice-sheet instability. Mass loss rates are a strong function of the sliding/friction law, with plastic laws cause a further destabilization of the Aurora and Wilkes Subglacial Basins, East Antarctica. Improvements to marine ice-sheet models have greatly reduced variability between modelled ice-sheet responses to extreme ice-shelf loss, e.g. compared to the SeaRISE assessments.
Bibliografie:ObjectType-Article-1
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content type line 14
ISSN:0022-1430
1727-5652
DOI:10.1017/jog.2020.67