Ocean-induced melt volume directly paces ice loss from Pine Island Glacier

The spatial distribution of ocean-induced melting beneath buttressing ice shelves is often cited as an important factor controlling Antarctica’s sea-level contribution. Using numerical simulations, we investigate the relative sensitivity of grounded-ice loss to the spatial distribution and overall v...

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Bibliographic Details
Published in:Science Advances
Main Authors: Joughin, Ian, Shapero, Daniel, Dutrieux, Pierre, Smith, Ben
Format: Text
Language:English
Published: American Association for the Advancement of Science 2021
Subjects:
Earth
Environmental
Ecological
and Space Sciences
Pine Island Glacier
Antarc*
Ice Shelf
Ice Shelves
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8535793/
http://www.ncbi.nlm.nih.gov/pubmed/34678060
https://doi.org/10.1126/sciadv.abi5738
Description
Summary:The spatial distribution of ocean-induced melting beneath buttressing ice shelves is often cited as an important factor controlling Antarctica’s sea-level contribution. Using numerical simulations, we investigate the relative sensitivity of grounded-ice loss to the spatial distribution and overall volume of ice-shelf melt over two centuries. Contrary to earlier work, we find only minor sensitivity to melt distribution (<6%), with a linear dependence of ice loss on the total melt. Thus, less complex models that need not reproduce the detailed melt distribution may simplify the projection of future sea level. The linear sensitivity suggests a contribution of up to 5.1 cm from Pine Island Glacier over the next two centuries given anticipated levels of ocean warming, provided its ice shelf does not collapse because of other causes.

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