Preprints
https://doi.org/10.5194/egusphere-2023-70
https://doi.org/10.5194/egusphere-2023-70
27 Feb 2023
 | 27 Feb 2023

Partial melting in polycrystalline ice: Pathways identified in 3D neutron tomographic images

Christopher Wilson, Mark Peternell, Filomena Salvemini, Vladimir Luzin, Frieder Enzmann, Olga Moravcova, and Nicholas Hunter

Abstract. In frozen cylinders composed of deuterium ice (Tm+3.8 ºC) and 10 % water ice (Tm 0 ºC) it is possible to track melt pathways produced by increasing the temperature during deformation. Raising the temperature to +2 ºC produces water (H2O) which combines with the D2O ice to form mixtures of HDO. As a consequence of deformation, HDO and H2O meltwater are expelled along conjugate shear bands and as compactional melt segregations. Melt segregations are also associated with high porosity networks related to the location of transient reaction fronts where the passage of melt-enriched fluids is controlled by the localized ductile yielding and lowering of the effective viscosity. Accompanying the softening, the meltwater also changes and weakens the crystallographic fabric development of the ice. Our observations suggest meltwater-enriched compaction and shear band initiation provides instabilities and the driving force for an enhancement of permeability in terrestrial ice sheets and glaciers.

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Journal article(s) based on this preprint

20 Feb 2024
Partial melting in polycrystalline ice: pathways identified in 3D neutron tomographic images
Christopher J. L. Wilson, Mark Peternell, Filomena Salvemini, Vladimir Luzin, Frieder Enzmann, Olga Moravcova, and Nicholas J. R. Hunter
The Cryosphere, 18, 819–836, https://doi.org/10.5194/tc-18-819-2024,https://doi.org/10.5194/tc-18-819-2024, 2024
Short summary
Christopher Wilson, Mark Peternell, Filomena Salvemini, Vladimir Luzin, Frieder Enzmann, Olga Moravcova, and Nicholas Hunter

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-70', Anonymous Referee #1, 03 Apr 2023
  • RC2: 'Comment on egusphere-2023-70', Anonymous Referee #2, 12 Jul 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-70', Anonymous Referee #1, 03 Apr 2023
  • RC2: 'Comment on egusphere-2023-70', Anonymous Referee #2, 12 Jul 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to revisions (further review by editor and referees) (24 Jul 2023) by Kaitlin Keegan
AR by Chris Wilson on behalf of the Authors (11 Aug 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Reconsider after major revisions (further review by editor and referees) (26 Aug 2023) by Kaitlin Keegan
AR by Chris Wilson on behalf of the Authors (11 Sep 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to revisions (further review by editor and referees) (06 Oct 2023) by Kaitlin Keegan
AR by Chris Wilson on behalf of the Authors (18 Oct 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (16 Nov 2023) by Kaitlin Keegan
AR by Chris Wilson on behalf of the Authors (27 Nov 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (05 Dec 2023) by Kaitlin Keegan
AR by Chris Wilson on behalf of the Authors (05 Dec 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (14 Dec 2023) by Kaitlin Keegan
AR by Chris Wilson on behalf of the Authors (20 Dec 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

20 Feb 2024
Partial melting in polycrystalline ice: pathways identified in 3D neutron tomographic images
Christopher J. L. Wilson, Mark Peternell, Filomena Salvemini, Vladimir Luzin, Frieder Enzmann, Olga Moravcova, and Nicholas J. R. Hunter
The Cryosphere, 18, 819–836, https://doi.org/10.5194/tc-18-819-2024,https://doi.org/10.5194/tc-18-819-2024, 2024
Short summary
Christopher Wilson, Mark Peternell, Filomena Salvemini, Vladimir Luzin, Frieder Enzmann, Olga Moravcova, and Nicholas Hunter
Christopher Wilson, Mark Peternell, Filomena Salvemini, Vladimir Luzin, Frieder Enzmann, Olga Moravcova, and Nicholas Hunter

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Short summary
As the temperature increases within a deforming ice aggregate, composed of deuterium (D2O) ice and water (H2O) ice, a set of meltwater segregations are produced. These are composed of H2O and HDO and are located in conjugate shear bands and in compaction bands which accommodate the deformation and weaken the ice aggregate. This has major implications for the passage of meltwater in ice sheets and the formation of the layering recognized in glaciers.