By comparing projections from climate models to records of drought patterns inscribed in tree rings, scientists have detected what may be the fingerprint of greenhouse gases as far back as the early 1900s.
Researchers take core samples from trees to study their growth rings and say they see signs that humans' influence on the climate affected drought risk in the early 1900s.
By now, there’s ample evidence to show that global warming leads to rising seas and more powerful storms. But scientists have had a tougher time picking out the effects on precipitation, which should increase in some places and decrease in others. Scientists can measure drought in different ways, and in this case, the researchers focused on soil moisture, which is “a good variable to look at,” said, a hydroclimatologist at the University of Southampton in Britain, who was not involved in the study.
The thickness of a tree’s annual rings gives scientists clues about the growing conditions it experienced over time, and it’s particularly useful for reconstructing a record of soil moisture, Cook said.“The one thing that matters more than anything else for most trees is water,” he said.— a scientist at Columbia and Ben Cook’s father — have compiled tree ring records from around the world into detailed “atlases” of drought.
Models predict that climate change will increase the risk of drought, like those that have affected California in recent years.
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