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Ground-level Ozone in Four Chinese Cities: Precursors, Regional Transport and Heterogeneous Processes : Volume 14, Issue 14 (12/08/2014)

By Xue, L. K.

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Book Id: WPLBN0003981626
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Ground-level Ozone in Four Chinese Cities: Precursors, Regional Transport and Heterogeneous Processes : Volume 14, Issue 14 (12/08/2014)  
Author: Xue, L. K.
Volume: Vol. 14, Issue 14
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Wang, T., Gao, J., Ding, A. J., Blake, D. R., Xue, L. K., Wang, W. X.,...Saunders, S. M. (2014). Ground-level Ozone in Four Chinese Cities: Precursors, Regional Transport and Heterogeneous Processes : Volume 14, Issue 14 (12/08/2014). Retrieved from http://members.worldlibrary.net/


Description
Description: Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China. We analyzed measurements of ozone (O3) and its precursors made at rural/suburban sites downwind of four large Chinese cities – Beijing, Shanghai, Guangzhou and Lanzhou, to elucidate their pollution characteristics, regional transport, in situ production, and impacts of heterogeneous processes. The same measurement techniques and observation-based model were used to minimize uncertainties in comparison of the results due to difference in methodologies. All four cities suffered from serious O3 pollution but showed different precursor distributions. The model-calculated in situ O3 production rates were compared with the observed change rates to infer the relative contributions of on-site photochemistry and transport. At the rural site of Beijing, export of the well-processed urban plumes contributed to the extremely high O3 levels (up to an hourly value of 286 ppbv), while the O3 pollution observed at suburban sites of Shanghai, Guangzhou and Lanzhou was dominated by intense in-situ production. The O3 production was in a VOCs-limited regime in both Shanghai and Guangzhou, and a NOx-controlled regime in Lanzhou. The key VOC precursors are aromatics and alkenes in Shanghai, and aromatics in Guangzhou. The potential impacts on O3 production of several heterogeneous processes, namely, hydrolysis of dinitrogen pentoxide (N2O5), uptake of hydro peroxy radical (HO2) on particles and surface reactions of NO2 forming nitrous acid (HONO), were assessed. The analyses indicate the varying and considerable impacts of these processes in different areas of China depending on the atmospheric abundances of aerosol and NOx, and suggest the urgent need to better understand these processes and represent them in photochemical models.

Summary
Ground-level ozone in four Chinese cities: precursors, regional transport and heterogeneous processes

Excerpt
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