期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 10, 页码 2137-2142出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50379
关键词
Antarctica; InSAR
资金
- UK NERC National Centre for Earth Observation
- EC ice2Sea project [145]
- European Space Agency's Support to Science Element program
- NERC [bas0100027] Funding Source: UKRI
- Natural Environment Research Council [bas0100027] Funding Source: researchfish
We use satellite observations to show that, between 1992 and 2011, the Pine Island Glacier hinge line retreated at a rate of 0.950.09 km yr(-1) despite a progressive steepening and shoaling of the glacier surface and bedrock slopes, respectively, which ought to impede retreat. The retreat has remained constant because the glacier terminus has thinned at an accelerating rate of 0.530.15 m yr(-2), with comparable changes upstream. This acceleration is consistent with an intensification of ocean-driven melting in the cavity beneath the floating section of the glacier. The pattern of hinge-line retreat meanders and is concentrated in isolated regions until ice becomes locally buoyant. Because the glacier-ocean system does not appear to have reached a position of relative stability, the lower limit of sea level projections may be too conservative.
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