Global warming leading to extreme rainfall
London: As temperatures rise, the intensity of extreme rainfall is increasing across the globe, according to the worldwide review of global rainfall data.
In the most comprehensive review of changes to extreme rainfall ever undertaken, researchers from the University of Adelaide, evaluated the association between extreme rainfall and atmospheric temperatures at more than 8000 weather gauging stations around the world, the telegraph reported.
“The results are that rainfall extremes are increasing on average globally. They show that there is a 7 percent increase in extreme rainfall intensity for every degree increase in global atmospheric temperature,” lead author Dr Seth Westra said.
“Assuming an increase in global average temperature by 3 to 5 degrees Celsius by the end of the 21st century, this could mean very substantial increases in rainfall intensity as a result of climate change,” he said.
Dr Westra, a Senior Lecturer with the University of Adelaide’s School of Civil, Environmental and Mining Engineering and member of the Environment Institute, said trends in rainfall extremes were examined over the period from 1900 to 2009 to determine whether they were becoming more intense or occurring more frequently.
“The results show that rainfall extremes were increasing over this period, and appear to be linked to the increase in global temperature of nearly a degree which also took place over this time.
“If extreme rainfall events continue to intensify, we can expect to see floods occurring more frequently around the world.” Dr Westra added.
The strongest increases occurred in the tropical countries, although some level of increase seems to be taking place at the majority of weather gauging stations.
“Most of these tropical countries are very poor and thus not well placed to adapt to the increased risk of flooding, which puts them in a larger threat of devastation,” he said.
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