Not only do Australians have a watchful eye on the threat of a return to La Nina conditions that contributed to an extreme climate that has affected parts of the nation over the past three years.
On Tuesday, the Bureau of Meteorology announced that although the La Nina 2021-22 event was over, according to its model there was a high chance it would re-emerge in the spring.
A house is abandoned by flood waters in Sylhet, Bangladesh, last month. Credit: AP
Weather zone meteorologist Ben Domensino said it was still unclear what impact this could have during the summer.
“At this stage it is difficult to know if La Nina is being redeveloped whether it will be maintained or not next summer. What we can say at the moment is that if it does, we are more likely to see your spring wetter than average in eastern and northern Australia. ”
Over the past two years, La Nina has not only contributed to widespread destruction in Australia and drought in the United States, but is believed to have aggravated catastrophic floods in Bangladesh, India and China. According to UNICEF, four million people have been stranded by sudden floods in northeastern Bangladesh alone.
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Columbia Climate School Lamont-Doherty Earth Observatory research professor Mingfang Ting said that while heavy rains were to be expected during the monsoon season, La Nina appeared to be aggravating. the rains.
“La Nina is definitely a culprit here. During La Nina, the ocean is warmer in the western tropical Pacific, or the warm pool region, allowing more abundant moist, warm air to be transported to southern China. when the weather system is aligned Another potential contributor is the dipole of the Indian Ocean, which is currently in a slightly negative phase, which also makes the western tropical Pacific warmer than normal.
“The same concept applies in Bangladesh and Northeast India, where floods are also occurring this year,” he told the school’s State of the Planet magazine.