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Bad weather to occur more, experts predict

By LI HONGYANG | China Daily | Updated: 2020-08-20 09:13
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A man disposes of a couch that was carried outdoors by floodwaters in Huanglongxi old town in Chengdu, Sichuan province, on Wednesday as the flood receded. ZHANG LANG/CHINA NEWS SERVICE

The heavy rainfall saturating the south this year is connected to global warming

Extreme weather events will occur more frequently in China as a result of global warming, something the country is particularly vulnerable to, meteorologists said following a record-setting spell of rainy weather in June and July.

Data from the National Climate Center show the Yangtze River Basin has seen about 54 percent more rain than average for two months, while the Huaihe River Basin had about 43 percent more.

The heavy rain in June and July, which caused flooding in many parts of China, was the longest lasting in records dating back to 1961.

Some regions had 30 percent of their average annual rainfall in just one day, and many places, including Lu'an in Anhui province and Poyang county in Jiangxi province, set rainfall records in the past two months.

"In general, the climate this year is pretty extraordinary," said Jia Xiaolong, deputy head of the center.

He said the continuous heavy rainfall occurred against the backdrop of global warming, which had caused the number of rainstorm days in China to increase by an average of 3.9 percent every 10 years for the past six decades.

This year, the Indian Ocean has seen its temperature rise above normal, causing a stronger subtropical high to affect China. Meanwhile, active cold air from the north has met warm air in the south, resulting in frequent heavy rainfall, he said.

China is improving its capacity for real-time analysis of global warming's role in extreme weather events in the hope of raising people's awareness of the need to take action to mitigate it.

Lu Chunhui, a researcher at the center, said China is catching up with other countries in a technique called attribution analysis.

"Countries such as the United Kingdom and Germany started this kind of analysis earlier than China, and they share data with each other so that they can quickly calculate the results of mathematical simulations of specific weather events," Lu said.

"China usually lags a few months behind its European counterparts in giving the results of its analysis. We are working to improve the system."

Wang Pengling, a senior engineer at the center, said that due to its large latitudinal span and range of landforms, China has complicated climate types and is especially vulnerable to climate change.

China has witnessed a temperature rise averaging 0.24 C per decade since the 1950s, significantly higher than the global average rise during the same period, Wang said. The World Meteorological Organization said in a report released in September that the global average temperature has increased by 1.1 C since 1880.

"China's ecologically fragile areas overlap with populous areas to a great extent, which further intensifies disaster risks brought by climate change," Wang said.

He called for more research on how extreme weather leads to disasters to better inform the public of the risks.

"Research findings indicate that global warming will continue," Wang said. "Under high emission scenarios globally, both the frequency and intensity of rainstorms in China will increase, raising the risks of floods. Low-carbon lifestyles should be encouraged worldwide, and cities need to enhance their adaptability to climate change."

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