University of Arizona Geoscientist Matthew Osman and collaborators report on Jet Stream changes that could amplify extreme weather phenomena by 2026

Sept. 23, 2021

Photo credit: Sarah Das (Woods Hole Oceanographic Institution)Description:University of Arizona postdoctoral research associate Matthew Osmansteadies an ice core drilling barrel into the Greenland Ice Sheet snow surface (Apr. 2015)

University of Arizona Geoscientist Matthew Osman and his research team used insights from a state-of-the-art water isotope–enabled climate model and a compilation of ice-core records from Greenland to reconstruct mean annual North Atlantic jet stream changes back to the 8th century CE. Their reconstruction suggests that observed jet stream variations are consistent with natural variations, despite dramatic warming across recent decades. Under unabated future warming, however, a progressive migration of the jet stream northward is projected to render it distinct from natural variability by 2060 CE. Their research is published in the Proceedings of the National Academy of Sciences of the United States of America.(PNAS September 21, 2021 118 (38) e2104105118;

This story appears at the University of Arizona news today (

Kiriaki Xiluri