While the current drought afflicting the Colorado River Basin is the worst since federal scientists began keeping records, a new study using paleoclimatic data discovers it is not the worst drought in the region’s recent geological history.
Researchers at the Bureau of Reclamation published the study Thursday in Geophysical Research Letters, a peer-reviewed geoscience journal.
Reading the tree rings from Montana to northern Mexico, from Pacific beaches to the Colorado Rockies, a team of scientists led by a UCLA researcher has shown that the current long-term drought in the West is the most severe in 1,200 years.
It’s not just a dry spell — it’s a megadrought.
The rigorous study, aided by NASA, shows all that talk you have heard most of your life, about how the lack of rain in these parts is normal, and about how “we live in a desert anyway” — we don’t; we live in a rare Mediterranean climate — is nonsense.
While dry events in California are not getting drier, extreme wet weather events have steadily increased in magnitude since the middle of the last century, new research shows.
These increased extreme wet events can result in more dangerous flooding and also fuel wildfires.
“Most research after 2015 has been very focused on this climate variability and how it’s going to get worse in the future,” says Diana Zamora-Reyes, a graduate student in the department of hydrology and atmospheric sciences at the University of Arizona and lead author of the paper in the International Journal of Climatology.
A two-decade-long dry spell that has parched much of the western United States is turning into one of the deepest megadroughts in the region in more than 1,200 years, a new study found.
And about half of this historic drought can be blamed on man-made global warming, according to a study in Thursday’s journal Science.
Scientists looked at a nine-state area from Oregon and Wyoming down through California and New Mexico, plus a sliver of southwestern Montana and parts of northern Mexico. They used thousands of tree rings to compare a drought that started in 2000 and is still going — despite a wet 2019 — to four past megadroughts since the year 800.
For 10 years, central Chile has been gripped by unrelenting drought. With 30% less rainfall than normal, verdant landscapes have withered, reservoirs are low, and more than 100,000 farm animals have died. The dry spell has lasted so long that researchers are calling it a “megadrought,” rivaling dry stretches centuries ago. It’s not so different from the decadelong drought that California, some 8000 kilometers away, endured until last year.
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