Journal
SCIENCE CHINA-EARTH SCIENCES
Volume 57, Issue 9, Pages 2156-2164Publisher
SCIENCE PRESS
DOI: 10.1007/s11430-014-4885-5
Keywords
visibility; fog; haze; PM2.5; aerosol hygroscopic growth; relative humidity
Categories
Funding
- Basic Research Program of China [2011CB403402]
- Basic Research Fund of Chinese Academy of Meteorological Sciences [2008Z011]
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Haze and fog are both low visibility events, but with different physical properties. Haze is caused by the increase of aerosol loading or the hygroscopic growth of aerosol at high relative humidity, whereas visibility degradation in fog is due to the light scattering of fog droplets, which are transited from aerosols via activation. Based on the difference of physical properties between haze and fog, this study presents a novel method to distinguish haze and fog using real time measurements of PM2.5, visibility, and relative humidity. In this method, a criterion can be developed based on the local historical data of particle number size distributions and aerosol hygroscopicity. Low visibility events can be classified into haze and fog according to this criterion.
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