affirms that conclusion, and for the first time comprehensively elucidates the multiple mechanisms—some strictly climate-related, others more in the realm of disastrous coincidences—that they say led to the mind-bending temperatures.' event, one that can't be predicted," said lead author Samuel Bartusek, a Ph.D. student at the Columbia Climate School's Lamont-Doherty Earth Observatory.
Average global temperatures have risen less than 2 degrees F in the last century. But small upward increments may shift interactions between atmosphere and land in ways that drive chances of extreme temperature spikes far beyond just the average temperature rise. Boiled down to the simplest terms, the study says much of the 2021 heat wave arose from the multiplying effects of higher overall temperatures, including drying of soils in some areas.
Some scientists believe big jet-stream waves are becoming more frequent and extreme due to human-induced warming. The jet stream normally forms a boundary between frigid polar air and warmer southern air, but recent outsize warming in the Arctic is breaking down the temperature difference, destabilizing the system, they say. This idea is still being debated.
Hot, dry weather during the heat wave sparked numerous wildfires, destroying large areas and worsening air quality. Credit: USDA photo by Kari Greer
NatureClimate All the planets in the solar system are heating up
NatureClimate heatwave
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