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Explosive volcanic eruptions in the tropics can lead to El Ni帽o events, those notorious warming periods in the Pacific Ocean with dramatic global impacts on the climate, according to a new study.

Enormous eruptions trigger El Ni帽o events by pumping millions of tons of sulfur dioxide into the stratosphere, which form a sulfuric acid cloud, reflecting solar radiation and reducing the average global surface temperature, according to the study co-authored by Alan Robock, a distinguished professor in the Department of Environmental Sciences at Rutgers University-New Brunswick.

The study, published online today in Nature Communications, used sophisticated climate model simulations to show that El Ni帽o tends to peak during the year after large volcanic eruptions like the one at Mount Pinatubo in the Philippines in 1991.

"We can't predict volcanic eruptions, but when the next one happens, we'll be able to do a much better job predicting the next several seasons, and before Pinatubo we really had no idea," said Robock, who has a doctorate in meteorology. "All we need is one number - how much sulfur dioxide goes into the stratosphere - and you can measure it with satellites the day after an eruption."

The El Ni帽o Southern Oscillation (ENSO) is nature's leading mode of periodic climate variability. It features sea surface temperature anomalies in the central and eastern Pacific. ENSO events (consisting of El Ni帽o or La Ni帽a, a cooling period) unfold every three to seven years and usually peak at the end of the calendar year, causing worldwide impacts on the climate by altering atmospheric circulation, the study notes.

Strong El Ni帽o events and wind shear typically suppress the development of hurricanes in the Atlantic Ocean, the National Oceanic and Atmospheric Administration says. But they can also lead to elevated sea levels and potentially damaging cold season nor'easters along the East Coast, among many other impacts.

Sea surface temperature data since 1882 document large El Ni帽o-like patterns following four out of five big eruptions: Santa Mar铆a (Guatemala) in October 1902, Mount Agung (Indonesia) in March 1963, El Chich贸n (Mexico) in April 1982 and Pinatubo in June 1991.

The study focused on the Mount Pinatubo eruption because it's the largest and best-documented tropical one in the modern technology period. It ejected about 20 million tons of sulfur dioxide, Robock said.

Cooling in tropical Africa after volcanic eruptions weakens the West African monsoon, and drives westerly wind anomalies near the equator over the western Pacific, the study says. The anomalies are amplified by air-sea interactions in the Pacific, favoring an El Ni帽o-like response.

Climate model simulations show that Pinatubo-like eruptions tend to shorten La Ni帽as, lengthen El Ni帽os and lead to unusual warming during neutral periods, the study says.

If there's a big volcanic eruption tomorrow, Robock said he could make predictions for seasonal temperatures, precipitation and the appearance of El Ni帽o next winter.

"If you're a farmer and you're in a part of the world where El Ni帽o or the lack of one determines how much rainfall you will get, you could make plans ahead of time for what crops to grow, based on the prediction for precipitation," he said.