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El Nino-linked cyclones to increase in Pacific with global warming - research
By Umberto Bacchi
LONDON (Thomson Reuters Foundation) - Small Pacific island states could be hit by more tropical cyclones during future El Nino weather patterns due to climate change, scientists said on Tuesday.
El Nino is a warming of sea-surface temperatures in the Pacific occurring every two to seven years which can trigger both floods and drought in different parts of the world.
Its opposite phase, a cooling of the same waters known as La Nina, is associated with the increased probability of wetter conditions over much of Australia and increased numbers of tropical cyclones.
Between 2070 and the end of the century, Fiji, Vanuatu, Solomon Islands, Marshall Islands and Hawaii could face an increased frequency in powerful storms during El Nino of up to 40 percent, Australian meteorologists said in a study.
However cyclones may be up to 60 percent less frequent during the opposite La Nina pattern, according to the study published in Nature Climate Change magazine.
Cyclones bring destructive winds, torrential rain and storm surges that are likely to be exacerbated by rising sea levels caused by global warming, posing a serious threat to Pacific islands, the authors said.
"Storm surge...can lead to massive waves propagating far inland, devastating structures and vegetation in its path," co-author Kevin Tory, of the Australia's Bureau of Meteorology (BOM) told the Thomson Reuters Foundation via email.
"Salt water inundation can also damage soil, leading to years of reduced agricultural yield," he said.
Researchers said in the last three decades of the century, the ocean's surface waters will be hotter than usual in the Western Pacific due to global warming, resulting in more frequent cyclones during El Nino.
"These results suggest tropical cyclone activity in these regions will increase in a future warmer climate," one of the study's authors, Savin Chand, of Federation University Australia said in an email.
The latest El Nino, which emerged in 2015 and ended in May this year resulted in sea temperatures rising to the highest levels in 19 years.
Small island developing states are already suffering the impacts of climate change, including rising seas and worsening extreme weather, and have pushed hard for more ambitious international efforts to reduce planet-warming emissions.
The Marshall Islands, Fiji and Palau were the first three countries to ratify the Paris climate change agreement to limit global temperature rise to "well below" 2 degrees Celsius earlier this year.
(Reporting by Umberto Bacchi @UmbertoBacchi, Editing by Katie Nguyen. Please credit the Thomson Reuters Foundation, the charitable arm of Thomson Reuters, that covers humanitarian news, women's rights, trafficking, property rights and climate change. Visit http://news.trust.org)
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