Global warming has pushed what would have been a moderate drought in southwestern North America into megadrought territory. Williams et al. used a combination of hydrological modeling and tree-ring reconstructions of summer soil moisture to show that the period from 2000 to 2018 was the driest 19-year span since the late 1500s and the second driest since 800 CE (see the Perspective by Stahle). This appears to be just the beginning of a more extreme trend toward megadrought as global warming continues.
Severe and persistent 21st-century drought in southwestern North America (SWNA) motivates comparisons to medieval megadroughts and questions about the role of anthropogenic climate change. We use hydrological modeling and new 1200-year tree-ring reconstructions of summer soil moisture to demonstrate that the 2000–2018 SWNA drought was the second driest 19-year period since 800 CE, exceeded only by a late-1500s megadrought. The megadrought-like trajectory of 2000–2018 soil moisture was driven by natural variability superimposed on drying due to anthropogenic warming. Anthropogenic trends in temperature, relative humidity, and precipitation estimated from 31 climate models account for 47% (model interquartiles of 35 to 105%) of the 2000–2018 drought severity, pushing an otherwise moderate drought onto a trajectory comparable to the worst SWNA megadroughts since 800 CE.[…]
Full article: Large contribution from anthropogenic warming to an emerging North American megadrought
Los Angeles residents at a section of the Los Angeles River cleanup in Los Angeles,…
Over the past decade, about 67 million gallons of fire retardant have been dropped on…
Photo: Golden Trout Wilderness Seeking blue, seeing gold The Kern Plateau features a chain of…
For the first time in more than a century, a salmon was observed swimming through Klamath…
New turnout facility from the California Aqueduct on Monday, Oct. 23, 2023. Officials say the…
Over the past century, humans have constructed major transportation infrastructure like highways, bridges, railroads, and…