“A Dartmouth study challenges the idea that climate change is behind the erratic wintertime behavior of the polar jet stream, the massive current of Arctic air that regulates weather for much of the Northern Hemisphere.
Large waves in the jet stream observed since the 1990s have, in recent years, driven abnormally frigid temperatures and devastating winter storms deep into regions such as the southern United States. Scientists fear that a warming atmosphere brought on by climate change is fueling these wild undulations, causing long troughs of bitter-cold air to drop down from the Arctic.
But a new paper in AGU Advancesled by Jacob Chalif ’21, Guarini, and Erich Osterberg, a professor of earth sciences, shows that the jet stream’s volatility actually may not be that unusual. Instead, the jet stream appears to have undergone natural—though sporadic—periods of “waviness” since before the effects of climate change were considered significant, the researchers report.“
Herb Simmens
Author of A Climate Vocabulary of the Future
“A wonderful achievement, a SciencePoem, an Inspiration, a Prophecy, also hilarious, Dive in and see"
Kim Stanley Robinson
@herbsimmens
On Jan 24, 2026, at 11:08 AM, John Nissen <johnnis...@gmail.com> wrote:
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