Abstract
This study discusses the evolution of particle number size distribution during episodes of heavy pollution and new particle formation in the urban atmosphere of Beijing to quantify the effects of dynamic processes (coagulation and condensation) on the particle number size distribution. During a heavy-pollution event, an extremely low number concentration of 3–10 nm particles (on average 46 cm−3) was observed. This is because nucleation-mode particles were easily removed by strong coagulational scavenging of larger particles under this condition. In addition, a large condensation sink (on average 0.13 s−1) restrained nucleation, which is one of the major sources of nucleation-mode particles. Conversely, during a new-particle formation event, the small condensation sink (0.01 s−1) of precursor facilitated nucleation. At the same time, preexisting particles had little ability to scavenge newly formed particles (around 1 nm) and allowed them to grow to a detectable size (larger than 3 nm currently). We suggest that the effects of dynamic processes (coagulation and condensation) on particle size distribution should be stressed under some extreme conditions of the relatively polluted urban atmosphere in addition to traffic and meteorological factors.
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Schwartz J, Dockery D W, Neas L M. Is daily mortality associated specifically with fine particles? J Air Waste Manage Assoc, 1996, 46: 927–939
Pope C A. Review: Epidemiological basis for particulate air pollution health standards. Aerosol Sci Technol, 2000, 32: 4–14
Pope C A, Dockery D W, Schwartz J. Review of epidemiological evidence of health-effects of particulate air-pollution. Inhalation Toxicol, 1995, 7: 1–18
Peters A, Wichmann H E, Tuch T, et al. Respiratory effects are associated with the number of ultrafine particles. Am J Resp Crit Care, 1997, 155: 1376–1383
Penttinen P, Timonen K L, Tiittanen P, et al. Number concentration and size of particles in urban air: Effects on spirometric lung function in adult asthmatic subjects. Environ Health Perspect, 2001, 109: 319–323
Biswas P, Wu C Y. Critical review: Nanoparticles and the environment. J Air Waste Manage Assoc, 2005, 55: 708–746
Wu Z J, Hu M, Lin P, et al. Particle number size distribution in the urban atmosphere of Beijing, China. Atmos Environ, 2008, 42: 7967–7980
Harrison R M, Jones M, Collins G. Measurements of the physical properties of particles in the urban atmosphere. Atmos Environ, 1999, 33: 309–321
Tuch T M, Wehner B, Pitz M, et al. Long-term measurements of size-segregated ambient aerosol in two German cities located 100 km apart. Atmos Environ, 2003, 37: 4687–4700
Hussein T, Puustinen A, Aalto P P, et al. Urban aerosol number size distributions. Atmos Chem Phys, 2004, 4: 391–411
Kulmala M, Rannik U, Pirjola L, et al. Characterization of atmospheric trace gas and aerosol concentrations at forest sites in southern and northern Finland using back trajectories. Boreal Environ Res, 2000, 5: 315–336
Mönkkönen P, Koponen I K, Lehtinen K E J, et al. Death of nucleation and Aitken mode particles: Observations at extreme atmospheric conditions and their theoretical explanation. J Aerosol Sci, 2004, 35: 781–787
Seinfeld J H, Pandis S N. Atmospheric Chemistry and Physics, New York: John Wiley & Sons, Inc. 1998
Hinds W C. Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles. 2nd ed. New York: John Wiley & Sons Inc., 1999
Hu M, Zhao Y L, He L Y, et al. Mass size distribution of Beijing particulate matters and its inorganic water-soluble ions in winter and summer. Chin J Environ Sci, 2005, 26: 1–6
Kulmala M. How particles nucleate and grow. Science, 2003. 302: 1000–1001
Yue D L, Hu M, Zhang R Y, et al. The roles of sulfuric acid in new particle formation and growth in the mega-city of Beijing. Atmos Chem Phys, 2010, 10: 4953–4960
Kulmala M, Vehkamäki H, Petäjä T, et al. Formation and growth rates of ultrafine atmospheric particles: A review of observations. J. Aerosol Sci, 2004, 35: 143–176
Wu Z J, Hu M, Liu S, et al. New particle formation in Beijing, China: Statistical analysis of a 1-year data set. J Geophys Res, 2007, 112, doi: 10.1029/2006JD007406
Kulmala M, Pirjola U, Mäkelä J M. Stable sulphate clusters as a source of new atmospheric particles. Nature, 2000, 404: 66–69
Kulmala M, Petäjä T, Mönkkönen P, et al. On the growth of nucleation mode particles: Source rates of condensable vapor in polluted and clean environments. Atmos Chem Phys, 2005, 5: 409–416
Dal Maso M, Kulmala M, Riipinen I, et al. Formation and growth of fresh atmospheric aerosols: Eight years of aerosol size distribution data from SMEAR II, Hyytiala, Finland. Boreal Environ Res, 2005, 10: 323–336
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Wu, Z., Hu, M., Yue, D. et al. Evolution of particle number size distribution in an urban atmosphere during episodes of heavy pollution and new particle formation. Sci. China Earth Sci. 54, 1772–1778 (2011). https://doi.org/10.1007/s11430-011-4227-9
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DOI: https://doi.org/10.1007/s11430-011-4227-9