- 期刊
- OpenAccess
Satellite and Ground Observations of Severe Air Pollution Episodes in the Winter of 2013 in Beijing, China
並列摘要
Beginning in early January 2013, Beijing experienced multiple prolonged and severe smog events that were characterized by very high levels of PM_(2.5), with peak daily PM_(2.5) over 400 μg m^(–3). With PM_(2.5) concentration contours created from ground observations and satellite remote sensing data, we describe the spatial and temporal characteristics of these episodes and further investigated the factors that contributed to these episodes. Our results indicated that these smog episodes affected a much larger geographic region, far beyond Beijing metropolitan area, corresponding to a total area of ~550,000 km^2 and ~180 million people. The extremely cold weather in December 2012 and regional pollution transport were likely the main causes of these severe PM pollutions. In addition to aggressive emission control measures for Beijing, coordinated regional policy must be put in place to achieve more blue-sky days. Although the configuration of the current ground monitoring network may be sufficient to record PM_(2.5) levels in urban centers, these monitors alone cannot fully characterize the spatial pattern and track the transport of air pollution on a regional scale. Satellite remote sensing data can provide valuable information to fill the gaps left by ground monitors to create a more comprehensive picture of PM_(2.5).
延伸閱讀
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