Preprints
https://doi.org/10.5194/tc-2021-209
https://doi.org/10.5194/tc-2021-209

  13 Aug 2021

13 Aug 2021

Review status: this preprint is currently under review for the journal TC.

Physical and mechanical properties of winter first-year ice in the Antarctic marginal ice zone along the Good Hope Line

Sebastian Skatulla1,4, Riesna R. Audh2,4, Andrea Cook1,4, Ehlke Hepworth2,4, Siobhan Johnson3,4, Doru C. Lupascu5, Keith MacHutchon1,4, Rutger Marquart1,4, Tommy Mielke5, Emmanuel Omatuku1,4, Felix Paul5, Tokoloho Rampai3,4, Jörg Schröder6, Carina Schwarz6, and Marcello Vichi2,4 Sebastian Skatulla et al.
  • 1University of Cape Town, Department of Civil Engineering, South Africa
  • 2University of Cape Town, Department of Oceanography, South Africa
  • 3University of Cape Town, Department of Chemical Engineering, South Africa
  • 4Marine and Antarctic Research Centre for Innovation and Sustainability (MARIS), University of Cape Town, South Africa
  • 5University of Duisburg-Essen, Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), Germany
  • 6University of Duisburg-Essen, Institute of Mechanics, Germany

Abstract. As part of the 2019 Southern oCean seAsonal Experiment (SCALE) Winter Cruise of the South African icebreaker SA Agulhas II first-year ice was sampled at the advancing outer edge of the Antarctic marginal ice zone along a 150 km-Good Hope Line transect. Ice cores were extracted from four solitary pancake ice floes of 1.83–2.95 m diameter and 0.37–0.45 m thickness as well as a 12 × 4 m2 pancake ice floe of 0.31–0.76 m thickness part of a larger consolidated pack ice domain. The ice cores were subsequently analyzed for temperature, salinity, texture, anisotropic elastic properties and compressive strength. All ice cores from both, solitary pancake ice floes and consolidated pack ice, exhibited predominantly granular textures. The vertical distributions of salinity, brine volume and mechanical properties were significantly different for the two ice types. High salinity values of 12.6 ± 4.9 PSU were found at the topmost layer of the solitary pancake ice floes but not for the consolidated pack ice. The uniaxial compressive strength for pancake ice and consolidated pack ice were determined as 2.3 ± 0.5 MPa and 4.1 ± 0.9 MPa, respectively. The Young’s and shear moduli in longitudinal core direction of solitary pancake ice were obtained as 3.7 ± 2.0 GPa and 1.3 ± 0.7 GPa, and for consolidated pack ice as 6.4 ± 1.6 GPa and 2.3 ± 0.6 GPa, respectively. Comparing Young’s and shear moduli measured in longitudinal and transverse core directions, a clear directional dependency was found, in particular for the consolidated pack ice.

Sebastian Skatulla et al.

Status: open (until 15 Oct 2021)

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Sebastian Skatulla et al.

Sebastian Skatulla et al.

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Short summary
First-year ice was sampled at the advancing outer edge of the Antarctic marginal ice zone (MIZ) along the Good Hope Line. Ice cores were extracted from five pancake ice floes and subsequently analyzed for their physical and mechanical properties. Of particular interest was to elucidate the transition of ice composition within the MIZ in terms of differences in mechanical stiffness and strength properties as linked to physical and textural characteristics at early-stage ice formation.