Climate change causing more change in rainfall, fiercer typhoons, scientists say

Posted
Last Updated

By David Stanway.

Climate change is driving changes in rainfall patterns across the world, scientists said in a paper published on Friday, which could also be intensifying typhoons and other tropical storms.
Taiwan, the Philippines and then China were lashed by the year’s most powerful typhoon this week, with schools, businesses and financial markets shut as wind speeds surged up to 227 kph (141 mph). On China’s eastern coast, hundreds of thousands of people were evacuated ahead of landfall on Thursday.
Stronger tropical storms are part of a wider phenomenon of weather extremes driven by higher temperatures, scientists say.
Researchers led by Zhang Wenxia at the China Academy of Sciences studied historical meteorological data and found about 75% of the world’s land area had seen a rise in “precipitation variability” or wider swings between wet and dry weather.
Warming temperatures have enhanced the ability of the atmosphere to hold moisture, which is causing wider fluctuations in rainfall, the researchers said in a paper, opens new tab published by the Science journal.
“(Variability) has increased in most places, including Australia, which means rainier rain periods and drier dry periods,” said Steven Sherwood, a scientist at the Climate Change Research Centre at the University of New South Wales, who was not involved in the study.
“This is going to increase as global warming continues, enhancing the chances of droughts and/or floods.”

FEWER, BUT MORE INTENSE, STORMS

Scientists believe that climate change is also reshaping the behaviour of tropical storms, including typhoons, making them less frequent but more powerful.
“I believe higher water vapour in the atmosphere is the ultimate cause of all of these tendencies toward more extreme hydrologic phenomena,” Sherwood told Reuters.
Typhoon Gaemi, which first made landfall in Taiwan on Wednesday, was the strongest to hit the island in eight years.

read more at reuters.com.

Image Credit: Wikimedia
Image Credit: Wikimedia