Connection of organics to atmospheric new particle formation and growth at an urban site of Beijing

Wang ZB, Hu M, Pei XY, Zhang RY, Paasonen P, Zheng J, Yue DL, Wu ZJ, et al. (2015). Connection of organics to atmospheric new particle formation and growth at an urban site of Beijing. Atmospheric Environment 103: 7-17. DOI:10.1016/j.atmosenv.2014.11.069.

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Abstract

In the present work, we aim to elucidate the roles of low-volatility organic vapours in atmospheric new particle formation in urban Beijing. Proposed organic molecules are derived from both the ambient measurement and the reasonable proxy. Several representations for the nucleation theories involving sulfuric acid and organic vapours are evaluated. The particle nucleation rates show good correlations both with sulfuric acid and organic vapours, suggesting that both play an important role in the atmospheric new particle formation. For the entile data set, the best fit (R=0.79, slope=1.1) between the observed and modelled particle nucleation rates is achieved with the homogenous nucleation theory of sulfuric acid (both homomolecularly and hetermolecularly) with separate coefficients in J=KSA1[H2SO4]2+KSA2[H2SO4][Org]. In addition, sulfuric acid concentration only contributes a small fraction (<15%) to the total observed growth rate. The growth rates of 7-30 nm particles show positive correlation with the organic vapours oxidized by ozone, suggesting that particle nucleation may be controlled by the light intensity or OH concentration, while the growth of nucleation mode particles seems to be limited more by the concentrations of the organic precursors.

Item Type: Article
Uncontrolled Keywords: New particle formation; Sulfuric acid; Organic vapour; Particle growth
Research Programs: Mitigation of Air Pollution (MAG)
Air Quality & Greenhouse Gases (AIR)
Bibliographic Reference: Atmospheric Environment; 103:7-17 (February 2015) (Published online 1 December 2014)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:53
Last Modified: 04 Apr 2016 10:17
URI: http://pure.iiasa.ac.at/11534

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