Narwhals equipped with sensors are used to collect Arctic temperature data.

What it means

Researchers from the Greenland Institute of Natural Resources fitted six narwhals with satellite-transmitting CTD sensors (measuring temperature, salinity, and depth) between 2017 and 2020. The narwhals dove deep into East Greenland fjords that icebreakers cannot reach, collecting unique data on warm Atlantic water intruding beneath glaciers, providing crucial insights into Arctic ocean warming and glacial melting.

Accuracy & sourcesGrounded

Solid claim based on a peer-reviewed study led by the Greenland Institute of Natural Resources, likely published in a journal such as Journal of Geophysical Research. The secondary reporting (Phys.org, ScienceAlert, University of Copenhagen press) is sourced directly from the researchers' press release and paper, making the basic factual claims highly reliable.

How new

Genuinely new — the study and its public reporting date from late August 2026. The underlying sensor data was collected between 2017 and 2020, but this is the first publication and dissemination of the results.

Go deeper