Scientists report that the Southern Ocean near Antarctica has become saltier for the first time in 130,000 years, a change linked to declining sea ice.

What it means

Scientists report that a key water mass in the Southern Ocean near Antarctica — the Antarctic Intermediate Water (AAIW) layer — has become saltier for the first time in roughly 130,000 years. The shift is driven by reduced freshwater input linked to declining sea ice, which caused the previously fresh, buoyant layer to turn saltier, denser, and deeper. This is seen as a potential disruption to the ocean's global circulation and climate system.

Accuracy & sourcesGrounded

The claim is based on a scientific study highlighted by secondary outlets (Gizmodo, Times of India, Ars Technica), none of which cite a specific primary paper in the provided text. However, multiple independent reports converge on the same mechanism and timescale (last interglacial, ~130,000 years), and search results point to researchers like Associate Professor Gayen discussing the AAIW switch. The 'first time in 130,000 years' is a strong paleoclimate inference, so while the recent trends are well-documented, the millennial-scale comparison likely relies on proxy records rather than direct observation.

How new