Why the Arctic's rivers are rusting - New study explains what's behind the toxic shift (impermafrost)

[OKIsItJustMe]

https://news.ucr.edu/articles/2026/06/01/why-arctics-rivers-are-rusting

Jules Bernstein
June 1, 2026

Scientists have identified the two biggest reasons that once-pristine rivers across the Arctic are growing cloudy with toxic orange iron particles that smother insects and suffocate fish.


Unmistakable rusty hue in Alaskan waters. (Tim Lyons/UCR)

A new study published in Communications Earth & Environment builds on earlier research documenting widespread contamination in Alaska’s Brooks Range. As the climate warms, a layer of Arctic soil that had been frozen for millennia has begun to thaw. Previous studies suggested that thawing permafrost was the ultimate cause of the damage. This new study proves that beyond a shadow of a doubt.

The new study also reveals two distinct ways in which thawing soil is rusting rivers and helps scientists predict where the damage is likely to spread next.

To investigate the rusting, the research team studied a wide regional view of a vast mountain region, then zoomed in on a specific river system, followed by an even closer look at a single creek. This deep-dive allowed them to connect big patterns to specific, on-the-ground processes.

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Dial, R.J., Hanna, C.T., Sullivan, P.F. et al. Permafrost thaw controls iron flux from wetlands and sulfide-bearing rocks to Arctic rivers and streams. Commun Earth Environ 7, 465 (2026). https://doi.org/10.1038/s43247-026-03450-x