Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23217
Title: Ground-level ozone in four Chinese cities : precursors, regional transport and heterogeneous processes
Authors: Xue, LK
Wang, T 
Gao, J
Ding, AJ
Zhou, XH
Blake, DR
Wang, XF
Saunders, SM
Fan, SJ
Zuo, HC
Zhang, QZ
Wang, WX
Issue Date: 2014
Publisher: Copernicus GmbH
Source: Atmospheric chemistry and physics, 2014, v. 14, no. 23, p. 13175-13188 How to cite?
Journal: Atmospheric chemistry and physics 
Abstract: We analyzed the 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 downwind 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 volatile organic compound (VOC)-limited regime in both Shanghai and Guangzhou, and a NOx-limited 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.
URI: http://hdl.handle.net/10397/23217
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-14-13175-2014
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

38
Last Week
1
Last month
0
Citations as of Oct 10, 2017

WEB OF SCIENCETM
Citations

32
Last Week
1
Last month
2
Citations as of Oct 1, 2017

Page view(s)

61
Last Week
1
Last month
Checked on Oct 22, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.