I did some modelling work to contribute to this paper that shows melting to be occurring in the Antarctic winter over Larsen C.
This melting is caused by hot, dry ‘foehn’ winds, which blow over the steep Antarctic Peninsula mountains over the ice shelf. They can increase temperatures from their usual wintertime levels of around -20°C to above freezing. This causes melting on the surface of the ice shelf, and could mean it is less stable than previously thought.
You can read the paper here: https://doi.org/10.1029/2018GL077899
Follow the thread on the tweet below from lead author, Peter Kuipers Munneke, for a great summary of the findings.