期刊
SCIENCE ADVANCES
卷 7, 期 24, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abg3080
关键词
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资金
- National Science Foundation [OAC-1835321, OPP-1643285]
- National Aeronautics Space Administration [NNX17AG54G]
- UK Natural Environment Research Council's iSTAR Programme (NERC) [NE/J005770/1]
The Pine Island Glacier in Antarctica has shown significant acceleration over the past few decades, making it the largest contributor to sea-level rise in the region. Recent acceleration is attributed to accelerated calving, independent of the processes responsible for past speedups.
Speedup of Pine Island Glacier over the past several decades has made it Antarctica's largest contributor to sea-level rise. The past speedup is largely due to grounding-line retreat in response to ocean-induced thinning that reduced ice-shelf buttressing. While speeds remained fairly steady from 2009 to late 2017, our Copernicus Sentinel 1A/B-derived velocity data show a >12% speedup over the past 3 years, coincident with a 19-km retreat of the ice shelf. We use an ice-flow model to simulate this loss, finding that accelerated calving can explain the recent speedup, independent of the grounding-line, melt-driven processes responsible for past speedups. If the ice shelf's rapid retreat continues, it could further destabilize the glacier far sooner than would be expected due to surface- or ocean-melting processes.
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