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Weather Blogs / Global climate change

Western U.S. wildfire smoke plumes getting taller

By Brett Anderson, AccuWeather senior meteorologist

Published Jul. 28, 2022 12:05 PM EDT | Updated Jul. 28, 2022 12:05 PM EDT

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New research from the University of Utah has shown that smoke plumes from wildfires in the western United States are trending higher into the atmosphere.

Taller smoke plumes that reach farther up in the atmosphere are able to expand more easily across large regions, which can lead to much more widespread air quality issues and reduced visibility.

Wildfire smoke covers large portions of the western U.S. in 2020.

The authors of the study stated that decreased precipitation across the western U.S. over recent decades, due mostly to climate change, has helped fuel larger fires, which are more capable of producing these massive plumes of smoke high up into the atmosphere.

Using computer models to track smoke plume activity from 2003 to 2020, the research team found that smoke plumes in a portion of the Sierra Nevada increased an average of 750 feet per year during the period. In four other regions of the West, smoke plumes increased in height by an average of 320 feet per year.

The smoke simulation models were also able to estimate the occurrence of pyrocumulonimbus clouds from the large fires, which are capable of growing into thunderstorms. Between 2017 and 2020, six regions of the West experienced their first fire-induced pyrocumulonimbus clouds on record.

Bootleg Fire in Oregon (2021) producing a massive pyrocumulonimbus cloud.

Key excerpts from the University of Utah report............

“Given climate-driven trends towards increasing atmospheric aridity, declining snowpack, hotter temperatures, etc., we’re seeing larger and more intense wildfires throughout the Western U.S.,” said Kai Wilmot, a postdoctoral researcher in the Department of Atmospheric Sciences at the University of Utah. “And so this is giving us larger burn areas and more intense fires.”

“When smoke is lofted to higher altitudes, it has the potential to be transported over longer distances, degrading air quality over a wider region,” said John Lin, professor of atmospheric sciences. “So wildfire smoke can go from a more localized issue to a regional to even continental problem.”

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ABOUT THIS BLOG
Global climate change
Brett Anderson
Brett Anderson discusses and analyzes the latest research and commentary by experts with various points of view.
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