It is not just Australians who have a weather-eye with the threat of a return to La Nina conditions that contributed to extreme weather that has hit parts of the nation over the past three years.
On Tuesday, the Bureau of Meteorology announced that although the La Nina event 2021-22 had ended, according to its models, there was a good chance it could reappear in the spring.
Weatherzone meteorologist Ben Domensino said it was not yet clear what impact this could have over the summer.
“It’s hard to say at the moment whether La Nina is evolving again, whether it will last until next summer. What we can say at the moment is that if it does, we are more likely to see your wetter spring than the average across eastern and northern Australia. “
Over the past two years, La Nina has not only contributed to extensive devastation in Australia and drought in the United States, but is believed to have exacerbated catastrophic floods in Bangladesh, India and China. According to UNICEF, four million people have been stranded by floods alone in northeastern Bangladesh.
Research professor at Columbia Climate Schools Lamont-Doherty Earth Observatory Mingfang Ting said that although heavy rain could be expected during the monsoon season, La Nina appeared to be exacerbating the rain.
“La Nina is certainly one of the culprits here. Under La Nina, the sea is warmer in the western tropical Pacific or the warm pool region, allowing more abundant warm, humid air to be transported to southern China once the weather system is adjusted. Another potential contributor is the Dipole in the Indian Ocean, which is in a slightly negative phase at the moment, which also makes the western tropical Pacific warmer than usual.
“The same concept applies to Bangladesh and northeastern India, where floods are also occurring this year,” she told the school State of the planet journal.