Overview
- Researchers published Friday traced the sharp sea‑ice decline since 2015 to a three‑stage process of stronger winds, heat mixing, and a warm, salty surface that blocks recovery.
- The Science Advances paper links record lows in 2022 and 2023, including a drop to about 691,000 square miles in 2023, to this sustained warm surface state.
- A separate Nature Communications study published Thursday shows long channels under ice shelves trap warmer water and boost local basal melt by roughly tenfold.
- Weakening ice shelves reduce the back‑pressure that slows inland glaciers, which can speed ice discharge into the ocean and push sea levels higher than many projections.
- Scientists warn that many climate and sea‑level models miss these small‑scale cavity and mixing processes, which also threaten ocean currents that store heat and carbon and complicate coastal planning.