Exceptions to bed-controlled ice sheet flow and retreat from glaciated continental margins worldwide.

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 Adv

journal_title

Science advances

authors

Greenwood SL,Simkins LM,Winsborrow MCM,Bjarnadóttir LR

doi

10.1126/sciadv.abb6291

subject

Has Abstract

pub_date

2021-01-13 00:00:00

issue

3

issn

2375-2548

pii

7/3/eabb6291

journal_volume

7

pub_type

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