婷婷丁香久久,日日夜夜天天久久,中文av岛国无码免费播放,国产最新进精品视频,一进一出下面喷白浆视频,天天夜夜人人,97免费在线观看视频

Climate change may help reduce air pollution in north China: research

Source: Xinhua| 2018-05-18 16:47:51|Editor: Xiang Bo
Video PlayerClose

BEIJING, May 18 (Xinhua) -- Climate change may have mitigated winter air pollution in north China over the past two decades, according to new research.

Researchers, analyzing data from 1996 to 2016, found that the Arctic has become warmer, accompanied by a rapid decline of sea ice cover, while Eurasia has cooled, causing the intensity of Siberian high atmospheric pressure to increase.

The Siberian high atmospheric pressure, called the Siberian High, is the main weather system that affects China in winter. Model calculation revealed that the enhanced Siberian High could bring about strengthened northerly winds, which have been the main driving force in dispersing smog on the North China Plain.

In January 2016, PM2.5 density during a strong Siberian High period was 100 to 200? micrograms per cubic meter of air lower than during a weaker period in January 2013.

They also found that the decrease in PM2.5 density caused by emission reduction was comparable to that caused by strong Siberian high atmospheric pressure, suggesting that climate change in the past few years might have mitigated air pollution.

Air quality usually worsens in winter in northern China due to increased emissions from heating sources and decreased wind.

The research, led by the Institute of Earth Environment under the Chinese Academy of Sciences, was recently published in the Journal "Earth's Future."

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011100001371891181