Decadal slowdown of a land-terminating sector of the Greenland Ice Sheet despite warming.

Abstract:

:Ice flow along land-terminating margins of the Greenland Ice Sheet (GIS) varies considerably in response to fluctuating inputs of surface meltwater to the bed of the ice sheet. Such inputs lubricate the ice-bed interface, transiently speeding up the flow of ice. Greater melting results in faster ice motion during summer, but slower motion over the subsequent winter, owing to the evolution of an efficient drainage system that enables water to drain from regions of the ice-sheet bed that have a high basal water pressure. However, the impact of hydrodynamic coupling on ice motion over decadal timescales remains poorly constrained. Here we show that annual ice motion across an 8,000-km(2) land-terminating region of the west GIS margin, extending to 1,100 m above sea level, was 12% slower in 2007-14 compared with 1985-94, despite a 50% increase in surface meltwater production. Our findings suggest that, over these three decades, hydrodynamic coupling in this section of the ablation zone resulted in a net slowdown of ice motion (not a speed-up, as previously postulated). Increases in meltwater production from projected climate warming may therefore further reduce the motion of land-terminating margins of the GIS. Our findings suggest that these sectors of the ice sheet are more resilient to the dynamic impacts of enhanced meltwater production than previously thought.

journal_name

Nature

journal_title

Nature

authors

Tedstone AJ,Nienow PW,Gourmelen N,Dehecq A,Goldberg D,Hanna E

doi

10.1038/nature15722

subject

Has Abstract

pub_date

2015-10-29 00:00:00

pages

692-5

issue

7575

eissn

0028-0836

issn

1476-4687

pii

nature15722

journal_volume

526

pub_type

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