Hurricane Ian dumped 10pc more rain due to climate change: Research

01 October 2022
Hurricane Ian dumped 10pc more rain due to climate change: Research

Hurricane Ian floods Florida due to climate change.

Climate change increased the rainfall from  Hurricane Ian by more than 10 percent, according to a new quick-fire  analysis, as one of the most powerful storms ever to hit the United States  devastated parts of Florida.
Ian "could be the deadliest hurricane in Florida history", President Joe  Biden said after the storm brought ferocious winds, turned streets into  churning rivers that swept away homes and left an unknown number of  casualties.
According to a rapid and preliminary analysis, human-caused climate change  increased the extreme rain that Ian unleashed by over 10 percent, US  scientists said.
"Climate change didn't cause the storm but it did cause it to be wetter,"  said Lawrence Berkeley National Laboratory's Michael Wehner, one of the  scientists behind the new finding.
The researchers compared simulations of today's world -- which has warmed  nearly 1.2 degrees Celsius since pre-industrial times -- with counterfactual  simulations of a world without human-induced climate change.
Wehner said that these were "conservative estimates", adding that while they are not peer reviewed, they are based on methods used in a study on the 2020  Atlantic hurricane season, which was published in April in the journal Nature  Communication.
Climate change from emissions of planet-heating greenhouse gases is warming  the ocean's surface and increasing moisture in the atmosphere that fuels  hurricanes.
Although the total number of tropical storms, or cyclones, may not increase,  scientists say warming is whipping up more powerful cyclones with stronger  winds and more precipitation.
"Human-caused climate change is affecting hurricanes in many ways including  causing them to intensify faster, be stronger overall, and dump a lot more  rain," tweeted climate scientist Katharine Hayhoe, who was not involved in  the research.
For each degree Celsius of warming, scientists expect the water in the  atmosphere to increase by around seven percent.  But Wehner said that his research found that storms are "more efficient" at  turning the available moisture into rainfall. Ian swept across Cuba on Tuesday, downing the country's power network, before  slamming into the Florida coast on Wednesday as a strong Category 4  hurricane.
The National Hurricane Center said  on Thursday the now Category 1 storm is  expected to bring "life-threatening flooding, storm surge and strong winds" to the Carolinas.

Add Rate