Climate change turbocharged the winds and rain of Typhoon Gaemi, which killed dozens of people across Taiwan, the Philippines and China last month, a group of scientists said yesterday.
Gaemi skirted the Philippines, triggering floods and landslides that killed at least 40 people, before making landfall in Taiwan and China.
In China, the weather system caused torrential downpours that killed 50 people and prompted authorities to evacuate 300,000.
Photo: Carlos Garcia Rawlins, Reuters
World Weather Attribution (WWA), a network of scientists who have pioneered peer-reviewed methods for assessing the role of climate change in extreme events, looked at three regions worst affected by the typhoon: the northern Philippines, Taiwan and China’s Hunan Province.
It found the system’s wind speeds were 7 percent more intense due to human-caused climate change, and its rainfall was 14 percent heavier in Taiwan and 9 percent heavier in Hunan.
The study could not draw definitive conclusions about the role of climate change on the rainfall in the Philippines, because of the region’s complex monsoon rain patterns.
Still, they found the warm seas that helped form and fuel Typhoon Gaemi “would have been virtually impossible” in a world that had not warmed to the current 1.2°C above preindustrial levels.
RISING FREQUENCY
The group’s modeling found this warming has already increased the number of similarly strong storms by 30 percent — up from about five per year to six or seven.
“This study confirms what we’ve expected — hotter seas and atmospheres are giving rise to more powerful, longer-lived and deadlier typhoons,” said Ralf Toumi, director of the Grantham Institute-Climate Change and the Environment at Imperial College London.
Teasing out the impact of climate change on tropical cyclones is complicated, but scientists are focusing more work on these weather systems.
WWA’s method involves assessing how unusual an extreme event is, then modeling the likelihood of a similar event and its intensity in two scenarios: today’s world and one without current levels of warming.
The scientists used that method and a new approach developed by Imperial College London that is tailored specifically to tropical storms.
It uses computer modeling to overcome the relative lack of historical data on tropical cyclones.
PREPAREDNESS
While the Asia-Pacific region has long dealt with typhoons, the scientists warned that their work highlighted “gaps in typhoon preparedness and the massive impacts caused by Gaemi.”
They called for better urban flood management and targeted warnings that offer more information on the likely impacts of a storm.
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