ニューヨーク・タイムズのインスタグラム(nytimes) - 8月16日 07時29分

At the Missoula Fire Sciences Laboratory, Mark Finney is recreating and studying fire whirls. In the wild, these fire whirls are unpredictable and dangerous. An exceptionally powerful whirl in late July during California’s unrelenting Carr Fire whipped winds up to 143 miles per hour, roaring and spinning for 90 minutes and scooping up ash, debris and flames. It uprooted trees, stripped the bark off them and downed power lines. The whirl, sometimes nicknamed a “firenado,” was so large it was picked up on Doppler radar. Mark and other scientists are racing to develop a deeper understanding of the combined effects of a warmer climate, massive tree die-offs that feed the wildfires, and developments encroaching into the wilderness. “Nature hides its mysteries pretty well,” Mark said. “It’s hard to believe, but the physics of how fires behave is largely mysterious. We’re in the days before the Enlightenment in this field. We need better science.” Big fires burn differently than small fires: logs, branches and other sources of fuel behave differently at varying temperatures. And wildfires often exhibit nonlinear behavior or act counterintuitively. The lab here hopes within a few years to create a computer model that can better represent these mind-bogglingly complex behaviors and help anticipate their patterns. @lvizzutti took this photo of Sara McAllister, left, and Mark, near the fire whirl generator at #MissoulaFire SciencesLaboratory. Visit the link in our profile to read more.

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