Home – Home – Jornals – Earth’s Cryosphere 2022 number 3

The analysis of differences in the structure of drifting ice ridges and ice ridges in the landfast ice was carried out on the basis of information obtained during research work done by the Arctic and Antarctic Research Institute in 2007-2019 in the Kara and Laptev Seas. The studies were carried out using thermal water drilling with logger recording of the penetration rate. The main attention was focused on the distribution of ice ridge porosity and the thickness of the consolidated layer. The unconsolidated part of the ice ridge keel and its compaction in the process of ice ridge formation under the action of the Archimedes force were considered. It was revealed that the ice ridges in the landfast ice differed from drifting ice ridges in their somewhat smaller geometric dimensions, but in steeper sail and keel slopes, as well as in a different keel/sail ratio (3.1 versus 3.6). In the landfast ice ridges the porosity of the unconsolidated part of the keel was lower than in drifting ice ridges (by 6 % on average). It was confirmed that the gradual decrease in the porosity of the unconsolidated part of the keel of the ice ridges in the landfast ice was caused by the under-ice currents.