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We could see more multi-year El Niño and La Niña events in Australia, according to an international team of researchers including a scientist from The Australian National University (ANU). Dr Georgy Falster from ANU said changes to the Pacific Walker Circulation – shifts in atmospheric patterns above the Pacific Ocean – have implications for El Niño and La Niña events in
Human greenhouse gas emissions aren’t driving major changes in massive air circulation across the Pacific Ocean, but reduction in aerosols over time could lead to a weakening of processes that influence the length and frequency of El Niño climate events.
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El Niño and La Niña events that persist for multiple years may become more common, which can exacerbate the associated risks of drought, fire, rains and floods.
It’s not just ocean temperatures that determine whether we have El Niño or La Niña. Air circulation also plays a role, and it’s changing in unexpected ways.