Abstract:
:Projections of ice sheet behavior hinge on how ice flow velocity evolves and the extent to which marine-based grounding lines are stable. Ice flow and grounding line retreat are variably governed by the coupling between the ice and underlying terrain. We ask to what degree catchment-scale bed characteristics determine ice flow and retreat, drawing on paleo-ice sheet landform imprints from 99 sites on continental shelves worldwide. We find that topographic setting has broadly steered ice flow and that the bed slope favors particular styles of retreat. However, we find exceptions to accepted "rules" of behavior: Regional topographic highs are not always an impediment to fast ice flow, retreat may proceed in a controlled, steady manner on reverse slopes and, unexpectedly, the occurrence of ice streaming is not favored on a particular geological substrate. Furthermore, once grounding line retreat is under way, readvance is rarely observed regardless of regional bed characteristics.
journal_name
Sci Advjournal_title
Science advancesauthors
Greenwood SL,Simkins LM,Winsborrow MCM,Bjarnadóttir LRdoi
10.1126/sciadv.abb6291subject
Has Abstractpub_date
2021-01-13 00:00:00issue
3issn
2375-2548pii
7/3/eabb6291journal_volume
7pub_type
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