La Nina to double!

Extreme weather arising from a climate phenomenon in the Pacific Ocean will get much worse as the world warms, according to climate modelling.

The latest data – based on detailed climate modelling work – suggests extreme La Nina events in the Pacific Ocean will almost double with global warming, from one in 23 years to one in 13 years. Most will follow extreme El Nino events, meaning frequent swings between opposite extremes from one year to the next.

Prof Mat Collins, Joint Met Office Chair in Climate Change at Exeter University, UK, is a co-researcher on the study, which involved teams in Australia, China, the US, UK and Peru. He said scientists were getting a better idea of how El Nino and La Nina are affected by global warming.

“Our previous research showed a doubling in frequency of extreme El Nino events, and this new study shows a similar fate for the cold phase of the cycle,” he said. “It shows again how we are just beginning to understand the consequences of global warming.”

BBC News, 26 Jan 2015