This enhanced decomposition is most evident in a deep thinning of the ozone layer above Antarctica in the austral spring.

More: continued here

pennstatelive posted a photo:

Modeled Antarctic ice sheet at particular times through the warm Marine
Isotope Stage 31 event, around 1.07 million years ago. A similar drastic
collapse of West Antarctic ice may happen in the next few thousand years
due to greenhouse-gas warming. Ice-sheet elevations and floating ice-shelf
thicknesses shown by two different color scales, "yr BP" is
"years before present".

More: continued here