Although a significant build-up in greenhouse gases in the atmosphere would alter worldwide precipitation patterns, a widely discussed technological approach to reduce future global warming would also interfere with rainfall and snowfall, new research shows.
The international study, led by scientists at the National Center for Atmospheric Research (NCAR), finds that global warming caused by a massive increase in greenhouse gases would spur a nearly 7 percent average increase in precipitation compared to preindustrial conditions.
But trying to resolve the problem through “geoengineering” could result in monsoonal rains in North America, East Asia, and other regions dropping by 5-7 percent compared to preindustrial conditions. Globally, average precipitation could decrease by about 4.5 percent.
“Geoengineering the planet doesn’t cure the problem,” says NCAR scientist Simone Tilmes, lead author of the new study. “Even if one of these techniques could keep global temperatures approximately balanced, precipitation would not return to preindustrial conditions.”