A wavy jet stream, air pollution, and changes to the landscape are all theories for why the Southeastern U.S. has warmed less than other parts of the planet
“When you have a forest, the ground is shaded and tends to not be as hot,” says Knox.
Aerosol pollution peaked in the 1980s and has since fallen to half those levels, largely thanks to the Clean Air Act signed in 1970.how much these aerosols influenced the warming hole. Because not every region subjected to aerosol pollution experienced a warming hole, Partridge and Winter say it may have simply amplified the effect in both the Southeast and Central U.S., rather than playing a leading role.
Depending on the time period studied or metric used—winter, summer, or annual temperatures, averages or maximums—the effects of the Southeast warming hole might or might not still be detectable., when Pacific surface temperatures shifted into a cooler phase. It’s unlikely to re-emerge, says Gerald Meehl, lead author of the study and climatologist at the National Center for Atmospheric Research.
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