Sulfate-nitrate-ammonium aerosols over China: response to 2000–2015 emission changes of sulfur dioxide, nitrogen oxides, and ammonia
The aerosol number concentration and size distribution as well as size-resolved particle chemical composition were measured during haze and photochemical smog episodes in Shanghai in 2009. The number of haze days accounted for 43%, of which 30% was severe (visibility < 2 km) and moderate (2 km ≤ visibility < 3 km) haze, mainly distributed in winter and spring. The mean particle number concentration was about 17,000 cm− 3 in haze, more than 2 times that in clean days. The greatest increase of particle number concentration was in 0.5–1 μm and 1–10 μm size fractions during haze events, about 17.78 times and 8.78 times those of clean days. The largest increase of particle number concentration was within 50–100 nm and 100–200 nm fractions during photochemical smog episodes, about 5.89 times and 4.29 times those of clean days. The particle volume concentration and surface concentration in haze, photochemical smog and clean days were 102, 49, 15 μm3/cm3 and 949, 649, 206 μm2/cm3, respectively. As haze events got more severe, the number concentration of particles smaller than 50 nm decreased, but the particles of 50–200 nm and 0.5–1 μm increased. The diurnal variation of particle number concentration showed a bimodal pattern in haze days. All soluble ions were increased during haze events, of which NH4+, SO42 − and NO3− increased greatly, followed by Na+, K+, Ca2 + and Cl−. These ions were very different in size-resolved particles during haze and photochemical smog episodes.
Sulfate-nitrate-ammonium aerosols over China: Response to 2000-2015 emission changes of sulfur dioxide, nitrogen oxides, and ammoniaY. Wang, Q. Q. Zhang, K. He, Q. Zhang, L. Chai in Atmospheric Chemistry and Physics (2013)
Natural and transboundary pollution influences on sulfate-nitrate-ammonium aerosols in the United States: Implications for policyRokjin J. Park, Daniel J. Jacob, Brendan D. Field, Robert M. Yantosca, Mian Chin in Journal of Geophysical Research D: Atmospheres (2004)
DOAS for flue gas monitoring—III. In-situ monitoring of sulfur dioxide, nitrogen monoxide and ammoniaJohan Mellqvist, Håkan Axelsson, Arne Rosén in Journal of Quantitative Spectroscopy and Radiative Transfer (1996)
Atmospheric concentrations of sulfur dioxide, nitrogen oxides, ammonia, hydrogen chloride, nitric acid, formic and acetic acids in the south of Vietnam measured by the passive sampling method.Tran Thi Ngoc Lan, Rokuro Nishimura, Yoshio Tsujino, Kiyoshi Imamura, Munehiro Warashina, Nguyen Thai Hoang, in Analytical sciences : the international journal of the Japan Society for Analytical Chemistry (2004)
Theory and application of unsteady catalytic detoxication of effluent gases from sulfur dioxide, nitrogen oxides and organic compoundsYurii Sh Matros, Aleksandr S. Noskov, Viktor A. Chumachenko, Oleg V. Goldman in Chemical Engineering Science (1988)
Related Full-Text Papers for Free
Sign up to download and organize them across all your devices with Mendeley, for free.