Reacción a "Antarctica loses 12,800 km² of coastline over 30 years"

The variability in sea ice in the Southern Ocean around Antarctica over recent decades has followed a rather peculiar pattern. Up until 2016, a net increase in sea-ice extent was observed, whereas over the past three years an opposite trend towards substantially lower concentrations appears to have begun. This shift in behaviour occurred under conditions of sustained global warming, which proved intriguing for the scientific community over the past decade.

This work, published by Rignot and co-authors, is a highly welcome contribution to the field, as it addresses the quantification of changes in the region where ice emerges from the continent and enters the ocean (an area commonly referred to as the grounding line) using satellite data for the period 1992–2025. The authors find that 77 % of the Antarctic coastline has not experienced substantial changes in the grounding line or, equivalently, that only 23 % of the coastline has seen a reduction in area. These results are relevant for understanding the causes of such asymmetries and provide further evidence to advance our understanding of cryospheric dynamics and their potential future impacts on sea level and the global climate.