Late spring 2018 land-fast sea ice and sub-ice platelet layer thicknesses from electromagnetic induction soundings along transect West-East-EM-Transect_20181106 in McMurdo Sound, Antarctica

• Main Authors: Brett, Gemma Marie, Leonard, Gregory H, Rack, Wolfgang, Irvin, Anne, Haas, Christian, Langhorne, Patricia J
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: Antarctic sea ice; DATE/TIME; DEEP SOUTH NATIONAL SCIENCE CHALLENGE: Targeted observation and process-informed modelling of Antarctic sea ice; electromagnetic induction; Electromagnetic sounding (EM); Geonics Ltd EM31-MK2; GEM; Ground-based electromagnetic induction; ice-ocean interaction; Ice thickness; Identification; LATITUDE; LONGITUDE; McMurdo; Sea ice thickness; Sub-ice platelet layer; Sub-ice platelet-layer thickness; TOPIMASI; West-East-EM-Transect_20181106; Antarctic; McMurdo Sound; Antarc*; Antarctica; Sea ice; The Cryosphere
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.968703; https://doi.org/10.1594/PANGAEA.968703

Ground-based electromagnetic induction (EM) measurements of land-fast sea ice and sub-ice platelet layer (SIPL) thickness distributions were carried out in McMurdo Sound, Antarctica in late spring (November 1-19) of 2018. Repeated west to east EM transects were carried out across McMurdo Sound along latitude 77.767°S. The EM data was acquired using a frequency-domain Geonics Ltd EM31-MK2 instrument mounted on a sledge and towed by skidoo. The thicknesses of consolidated ice (sea ice plus the snow layer) and the sub-ice platelet layer were simultaneously retrieved from the EM31 measured response using forward modelling and inversion methods of Irvin (2018). Variability in EM thicknesses detected significant growth of sub-ice platelet layer over the 18-day survey period (Brett et al., 2024).