Strong ice-ocean interaction beneath Shirase Glacier Tongue in East Antarctica

• Published in: Nature Communications
• Main Authors: Hirano, D, Tamura, T, Kusahara, K, Ohshima, KI, Nicholls, KW, Ushio, S, Simizu, D, Ono, K, Fujii, M, Nogi, Y, Aoki, S
• Format: Article in Journal/Newspaper
• Language: English
• Published: Nature Publishing Group 2020
• Subjects: Earth Sciences; Oceanography; Physical oceanography; Antarctic; Southern Ocean; The Antarctic; East Antarctica; Shirase Glacier; Antarc*; Antarctica; Ice Sheet; Ice Shelf; Ice Shelves; Totten Ice Shelf
• Online Access: https://doi.org/10.1038/s41467-020-17527-4; http://www.ncbi.nlm.nih.gov/pubmed/32839464; http://ecite.utas.edu.au/143771

Mass loss from the Antarctic ice sheet, Earths largest freshwater reservoir, results directly in global sea-level rise and Southern Ocean freshening. Observational and modeling studies have demonstrated that ice shelf basal melting, resulting from the inflow of warm water onto the Antarctic continental shelf, plays a key role in the ice sheets mass balance. In recent decades, warm ocean-cryosphere interaction in the Amundsen and Bellingshausen seas has received a great deal of attention. However, except for Totten Ice Shelf, East Antarctic ice shelves typically have cold ice cavities with low basal melt rates. Here we present direct observational evidence of high basal melt rates (716 m yr −1 ) beneath an East Antarctic ice shelf, Shirase Glacier Tongue, driven by southward-flowing warm water guided by a deep continuous trough extending to the continental slope. The strength of the alongshore wind controls the thickness of the inflowing warm water layer and the rate of basal melting.