Striped icebergs. Preliminary discussion on the respective roles and positionings of sea ice, marine ice, glacier ice and ice shelf

• Main Author: Guy, Bernard
• Other Authors: École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom Paris (IMT)
• Format: Report
• Language: English
• Published: HAL CCSD 2024
• Subjects: icebergs ice sea ice glacier ice ice shelf seawater freezing constitutional supercooling columns parallel planes NaCl solidification self-organization basalt columns; icebergs; ice; sea ice; glacier ice; ice shelf; seawater; freezing; constitutional supercooling; columns; parallel planes; NaCl; solidification; self-organization; basalt columns; [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]; [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology; Ice Shelf; Sea ice
• Online Access: https://hal.science/hal-04378912; https://hal.science/hal-04378912/document; https://hal.science/hal-04378912/file/striped%20icebergs%20bguy%202024.pdf

We offer a few comments on the formation of striped icebergs. We discuss the different types of ice as distinguished by the authors: glacier ice, ice shelf, marine ice, sea ice. We rely on the hypothesis exposed in Guy (<hal-03559083>, 2022): the planar and columnar structures characterizing such icebergs result from the fingered solidification of sea water under the iceshelf ice (instability of the planar freezing front due to constitutional supercooling). We propose to separate marine ice into two types:-type 1-marine ice, restricted to ice formation by nucleation within the water beneath the ice shelf;-type 2-marine ice, for the fingered ice formed at the ice-water front below the ice shelf. The complete succession of zones may thus comprise, from top to bottom: glacier ice / type 2-marine ice / type 1-marine ice / seawater. Some results from the article by Warren et al. (JGR Oceans, 124, 2019) are discussed. Nous proposons quelques commentaires sur la formation des icebergs feuilletés (striped icebergs). Nous faisons la part des différents types de glace distingués par les auteurs : glacier ice, ice shelf, marine ice, sea ice. Nous exploitons l’hypothèse que les structures planaires et colonnaires caractérisant de tels icebergs résultent de la solidification digitée de l’eau de mer sous la glace des iceshelf (instabilité du front plan de la solidification eau -> glace, surfusion de constitution; Guy, <hal-03559083>, 2022). Nous proposons de séparer la marine ice en deux types : - marine ice de type 1, la retreignant à la formation de la glace par nucléation dans l’océan, sous l’ice shelf - marine ice de type 2, pour la glace digitée formée à partir du front glace - eau le long de l’ice shelf. La succession complète des zones peut ainsi comporter, de haut en bas : glacier ice / marine ice de type 2 / marine ice de type 1 / eau de mer. Quelques résultats de l’article de Warren et al. (JGR Oceans, 124, 2019) sont discutés.