Ice-shelf retreat drives recent Pine Island Glacier speedup.
Ice-shelf retreat drives recent Pine Island Glacier speedup.
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DOI:
10.1126/sciadv.abg3080
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发表时间:
2021-06
期刊:
影响因子:
13.6
通讯作者:
Barham M
中科院分区:
文献类型:
--
作者:
Joughin I;Shapero D;Smith B;Dutrieux P;Barham M
Antarctica’s largest contributor to sea level has sped up further as a major section of its floating ice shelf collapsed. 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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