Earth’s Cryosphere, 2025, Vol. XXIX, No. 2, p. 3-14.
CRYOGENIC PHENOMENA IN SEAS AND OCEANS
SPECIFIC FEATURES OF POROSITY DISTRIBUTION IN VARIOUS TYPES OF PRESSURE ICE RIDGES
V.V. Kharitonov
Arctic and Antarctic Research Institute, Beringa St. 38, St. Petersburg, 199397 Russia
*Corresponding author; e-mail: kharitonov@aari.ru
The study focuses on the porosity distribution of the unconsolidated part of various types of pressure ice ridges as a granulated medium. The porosity estimate was obtained by processing records of the rate of thermal drilling of ice ridges. The variability of the porosity of ice ridges caused by the action of gravity and the Archimedes force during ice ridge formation is analyzed. It is shown that the porosity distribution in the sails of first-year drifting ice ridges and ice ridges in the fast ice is approximately the same, but the keel porosity in the ice ridges of the fast ice is slightly shifted towards lower values. The porosity of the sail, the blocks of which are more elongated and thinner, is higher than the porosity of the sail composed of thicker ice blocks. The tendency to a decrease in the average porosity of the sail and keel of pressure ice ridges with the distance from the ice surface deep into the ice ridge is preserved with an increase in the age of the ice ridge, but becomes less pronounced.
Keywords: fast ice, first-year pressure ice ridge, second-year ice ridge, multiyear ice ridge, keel, porosity distribution, sail.
Recommended citation: Kharitonov V.V., 2025. Specific features of porosity distribution in various types of pressure ice ridges. Earth’s Cryosphere XXIX (2), 3–14.
Received September 25, 2024
Revised December 6, 2024
Accepted February 9, 2025
Translated by A.V. Muravyev