Understanding the Process from New Particle Formation to Haze in North China
Abstract
PM2.5 pollution and haze has been concerned in North China, especially in Beijing and surrounding areas. The new particle formation (NPF) and growth is believed as one possible process for haze formation. We demonstrated a periodic cycle of PM episodes in Beijing that is governed by meteorological conditions and characterized by two distinct aerosol formation processes of nucleation and growth. Simultaneous intensive field measurements were conducted in the winter of 2017 in two sites of urban Beijing and regional Dezhou in Shandong Province. Particle number concentration (down to 1.5nm), gas precursors (such as sulphuric acid, NH3, amine, and HOMs), and aerosol chemical compositions were measured. NPF events was observed with the efficiency of 49% and 51%, in which 23% and 27% resulted in regional haze in Beijing and Dezhou, respectively. Sulphuric acid, NH3, amine, and HOMs are potential precursors for the NPF event. The new particles acted as the seeds in the atmosphere and sequent growth with contribution of secondary organic aerosols and secondary inorganic ions. The MALTE-box model is adopted to discuss the nucleation formation.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A41B..02M
- Keywords:
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- 0305 Aerosols and particles;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0317 Chemical kinetic and photochemical properties;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE