Jason Samenow writes: California’s astonishingly low snowpack, a pathetic 5 percent of normal, and the severity of the drought afflicting the state isn’t some fluke. It’s a likely consequence of climate change, specifically the rising temperatures which are intensifying many of the processes causing the state to lose water at an alarming rate.
To begin, let’s make clear climate change is best characterized as a drought amplifier rather than the cause of the drought itself. The climate system has enormous natural variability and several studies and analyses have linked the drought to a randomly occurring configuration of Pacific Ocean temperatures that encourages atmospheric winds to steer weather systems away from the Golden State.
For three years strong, the atmosphere steering flow has hit a road block along the West Coast (dubbed the “ridiculously resilient ridge”), but connecting that to climate change has proven difficult.
But even as climate change probably isn’t driving the weather pattern behind the drought, it is directing the background temperatures: up. Atmospheric levels of the heat-trapping gas carbon dioxide, due to the burning of fossil fuels, have risen about 25 percent since 1958. [Continue reading…]