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West’s ‘hot drought’ is unprecedented in more than 500 years

February 4, 2024
in Science
West’s ‘hot drought’ is unprecedented in more than 500 years
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heat wave

Credit: Unsplash/CC0 Public Domain

There’s no precedent in at least five centuries for how hot and dry the West has been in the last two decades, new research asserts using analysis of tree rings.

The study, published in late January, adds to an ever-growing slew of research that suggests human-caused climate change is warming the earth in ways never seen before. It furthers other research like one study, published last year, that showed the West’s conditions over the last 20 years are the driest in 1,200 years because of climate change.

Extreme heat and dry conditions amplify one another—a positive feedback loop climate scientists call “hot drought.”

Findings show, however, that hot drought has never been this severe, making future projections and mitigation measures more unclear, said Karen King, a University of Tennessee, Knoxville assistant professor and lead author of the study.

These conclusions have important implications for Nevada, the nation’s driest state that largely depends on the shrinking availability of the Colorado River, and the Southwest as a whole.

“When you have these compound extreme climatic events, the consequences are also compounded,” King said. “With this increased association of heat and drought, it almost makes it more uncertain: Are we going to be able to predict when this mega-drought ends?”

Scientists looked at how long and wide tree rings are to catch a glimpse into temperatures dating back to 1553. Denser rings generally signal warmer temperatures, while less dense rings show cooler ones, she said.

Recent technological advancements in the field of dendrology, or the study of tree rings, made the study possible. Rather than using expensive and time-consuming X-rays to measure ring density as developed in the ’90s, researchers can now manipulate light to do so.

Recording the amount of reflected blue light in each annual ring gives scientists a better picture of density—a much safer, easier and less costly method.

“Where we could do better is trying to understand how the frequency of compound climate extremes in the modern century compares to the past,” King said. “This is a good step forward.”

The study is just the start of understanding temperature changes throughout history, said David Meko, professor of the Laboratory of Tree-Ring Research at the University of Arizona, who wasn’t involved in the study.

Though there’s much in the field left to explore, he said, the study expands previous understanding of hot drought with the help of new technology.

“This is something that, without having any kind of triggering variable, can give us input on temperature and let us understand the climate footprint of these droughts,” Meko said.

In the future, Meko said, scientists will work toward finding ways to understand winter temperature lows and gather an idea of how much snowmelt there may have been across centuries.

Historical heat analysis, though, is vital to help people grasp how human-caused climate change is affecting temperatures today, he said.

“Whatever stress is caused by low precipitation or even mildly low precipitation is going to cause greater stress on the planet because of rising temperatures,” Meko said.

More information:
Karen E. King et al, Increasing prevalence of hot drought across western North America since the 16th century, Science Advances (2024). DOI: 10.1126/sciadv.adj4289

2024 Las Vegas Review-Journal. Distributed by Tribune Content Agency, LLC.

Citation:
West’s ‘hot drought’ is unprecedented in more than 500 years (2024, February 4)
retrieved 4 February 2024
from https://phys.org/news/2024-02-west-hot-drought-unprecedented-years.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2024-02-west-hot-drought-unprecedented-years.html

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