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Seismic evidence fo...
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Kulessa, BerndSwansea Univ, Glaciol Grp, Coll of Sci
(författare)
Seismic evidence for complex sedimentary control of Greenland Ice Sheet flow
- Artikel/kapitelEngelska2017
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American Association for the Advancement of Science (AAAS),2017
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LIBRIS-ID:oai:DiVA.org:uu-336647
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-336647URI
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https://doi.org/10.1126/sciadv.1603071DOI
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Språk:engelska
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Sammanfattning på:engelska
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The land-terminating margin of the Greenland Ice Sheet has slowed down in recent decades, although the causes and implications for future ice flow are unclear. Explained originally by a self-regulating mechanism where basal slip reduces as drainage evolves from low to high efficiency, recent numerical modeling invokes a sedimentary control of ice sheet flow as an alternative hypothesis. Although both hypotheses can explain the recent slowdown, their respective forecasts of a long-term deceleration versus an acceleration of ice flow are contradictory. We present amplitude-versus-angle seismic data as the first observational test of the alternative hypothesis. We document transient modifications of basal sediment strengths by rapid subglacial drainages of supraglacial lakes, the primary current control on summer ice sheet flow according to our numerical model. Our observations agree with simulations of initial postdrainage sediment weakening and ice flow accelerations, and subsequent sediment restrengthening and ice flow decelerations, and thus confirm the alternative hypothesis. Although simulated melt season acceleration of ice flow due to weakening of subglacial sediments does not currently outweigh winter slowdown forced by self regulation, they could dominate over the longer term. Subglacial sediments beneath the Greenland Ice Sheet must therefore be mapped and characterized, and a sedimentary control of ice flow must be evaluated against competing self-regulation mechanisms.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Hubbard, Alun L.UiT Arctic Univ Norway, Ctr Arctic Gas Hydrate Environm & Climate, Dept Geosci.; Aberystwyth Univ, Ctr Glaciol, Dept Geog & Earth Sci
(författare)
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Booth, Adam D.Univ Leeds, Inst Appl Geosci, Sch Earth & Environm
(författare)
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Bougamont, MarionUniv Cambridge, Scott Polar Res Inst, Dept Geog
(författare)
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Dow, Christine F.Swansea Univ, Glaciol Grp, Coll Sci, Singleton Pk.; Univ Waterloo, Dept Geog & Environm Management
(författare)
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Doyle, Samuel H.Aberystwyth Univ, Ctr Glaciol, Dept Geog & Earth Sci
(författare)
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Christoffersen, PoulUniv Cambridge, Scott Polar Res Inst, Dept Geog
(författare)
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Lindback, KatrinNorwegian Polar Res Inst, Fram Ctr
(författare)
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Pettersson, RickardUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)ricpe317
(författare)
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Fitzpatrick, Andrew A. W.Aberystwyth Univ, Ctr Glaciol, Dept Geog & Earth Sci
(författare)
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Jones, Glenn A.Swansea Univ, Glaciol Grp, Coll of Sci.; Aberystwyth Univ, Ctr Glaciol, Dept Geog & Earth Sci
(författare)
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Swansea Univ, Glaciol Grp, Coll of SciUiT Arctic Univ Norway, Ctr Arctic Gas Hydrate Environm & Climate, Dept Geosci.; Aberystwyth Univ, Ctr Glaciol, Dept Geog & Earth Sci
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Science Advances: American Association for the Advancement of Science (AAAS)3:82375-2548
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Kulessa, Bernd
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Hubbard, Alun L.
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Booth, Adam D.
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Dow, Christine F ...
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Doyle, Samuel H.
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Lindback, Katrin
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Jones, Glenn A.
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