The extremity of the deadly heat wave is visible inside the region's trees, new research shows.
Karen Heeter described how, during unusually hot years, tree rings are denser.
“I’m looking at how dense the later growing portion of the ring is,” Heeter told Earther during a phone call. “When it’s really warm [that year], typically I’m seeing these really dark dense fans of the late wood portion of the ring.” Those denser sections reflect back less blue light, which can mean the tree experienced higher temperatures that year. “You see this very dark band,” she said, referring to 2021 rings from north Idaho.
They also noted that the largest rates of temperature change have occurred in the last decades of the 1900s. “While the 2021 value substantially increases the period’s average anomaly, even without its inclusion, the period from 1979—2020 CE is still the warmest on record,” the team wrote.The tree rings help fill in blanks about historic temperatures in the Pacific Northwest region, which is important because official temperature records for the U.S.
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