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dc.contributor.authorChandler, David Matthew
dc.contributor.authorHubbard, Alun
dc.date.accessioned2023-07-11T09:20:44Z
dc.date.available2023-07-11T09:20:44Z
dc.date.issued2023-06-19
dc.description.abstractDramatic supraglacial lake drainage events in Greenland and Antarctica are enabled by rapid hydrofracture propagation through ice over 1 km thick. Here we present a slower mode of hydrofracture, where hairline surface fractures intersect supraglacial streams, and hypothesize that penetration depth is critically limited by water supply and englacial refreezing. We develop a model of stream-fed hydrofracture, and find that under most conditions in Greenland, 2-cm-wide fractures can penetrate hundreds of metres before freezing closed. Conditions for full-depth hydrofracture are more restricted, requiring larger meltwater channels and/or warm englacial conditions. Given the abundance of streams and surface fractures across Greenland and Antarctica’s expanding ablation zones, we propose that stream-driven hydrofractures are ubiquitous—even where distant from supraglacial lakes and crevasse fields. This intriguing process remains undetectable by current satellite remote sensing, yet has two major impacts that warrant further investigation. First, by driving widespread cryohydrologic warming at depths far greater than surface crevassing, it explains a consistent cold bias in modelled englacial thermal profiles. Second, the associated reduction in ice viscosity and increased damage accumulation act to enhance the vulnerability of ice sheets and shelves to dynamic instability as supraglacial drainage networks expand inland to higher elevationsen_US
dc.identifier.citationChandler DM, Hubbard AL. Widespread partial-depth hydrofractures in ice sheets driven by supraglacial streams. Nature Geoscience. 2023en_US
dc.identifier.cristinIDFRIDAID 2157713
dc.identifier.doi10.1038/s41561-023-01208-0
dc.identifier.issn1752-0894
dc.identifier.issn1752-0908
dc.identifier.urihttps://hdl.handle.net/10037/29617
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.relation.journalNature Geoscience
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDNatural Environment Research Council: NE/H023879/1en_US
dc.relation.projectIDNorges forskningsråd: 332635en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleWidespread partial-depth hydrofractures in ice sheets driven by supraglacial streamsen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution 4.0 International (CC BY 4.0)