Journal
NATIONAL SCIENCE REVIEW
Volume 6, Issue 3, Pages 515-523Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwy118
Keywords
haze; visibility; global warming
Categories
Funding
- Major Program of the National Natural Science Foundation of China [916442220]
- National Science and Technology Support Program [2014BAC21B01]
- National Science Fund for Distinguished Young Scholars [41425020]
- Public Welfare Projects for Environmental Protection in China [201509001]
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An observation-based approach is used to examine key characteristics of winter haze days in four major polluted regions in China. Major findings in this study are: first, there was no significant trend in the number of winter haze days in most provinces and districts in eastern China from 1973 to 2012, contrary to the 2.5-fold increase in the emissions of particulate matter and its precursors (PM emissions) in the same period of time. Second, meteorological and climate conditions rather than PM emissions are in control of the interannual variabilities and trends of winter haze days. These interannual variabilities (ranging from 24 to 125%) pose a substantial masking effect that must be overcome by any control of PM emissions before its impact becomes statistically detectable. Finally, we find that global warming may have contributed significantly to the trend of winter haze days in eastern China.
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