Monitoring Mélange in the loose tooth rift at the Amery Ice Shelf in the Antarctic

A large calving event occurred in late September 2019 in the loose tooth rift system of Amery Ice Shelf in east Antarctica, forming a giant iceberg of >1600 km² in area．There are a large number of Mélanges in the rifts of the Ice Shelf, which were partially lost due to calving event．Together with Landsat-8 optical data and Sentienl-1 SAR data, CryoSat-2 altimetry data and 8 m resolution DEM products released by REMA project were used to study terrain characteristics of Mélanges in detail．It is found that the annual elevation of Mélanges decreased from 2016-2018．The average elevation and standard deviation of Mélange in T1 were found to be higher than that in T2．Encounter with ice stream suture zone will influence Mélange in the rift, likely to promote propagation of the rift．