Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/75887
Title: Long-term O-3-precursor relationships in Hong Kong : field observation and model simulation
Authors: Wang, Y 
Wang, H 
Guo, H 
Lyu, XP 
Cheng, HR
Ling, ZH
Louie, PKK
Simpson, IJ
Meinardi, S
Blake, DR
Issue Date: 2017
Publisher: Copernicus GmbH
Source: Atmospheric chemistry and physics, 2017, v. 17, no. 18, p. 10919-10935 How to cite?
Journal: Atmospheric chemistry and physics 
Abstract: Over the past 10 years (2005-2014), ground-level O-3 in Hong Kong has consistently increased in all seasons except winter, despite the yearly reduction of its precursors, i.e. nitrogen oxides (NOx = NO + NO2), total volatile organic compounds (TVOCs), and carbon monoxide (CO). To explain the contradictory phenomena, an observation-based box model (OBM) coupled with CB05 mechanism was applied in order to understand the influence of both locally produced O-3 and regional transport. The simulation of locally produced O-3 showed an increasing trend in spring, a decreasing trend in autumn, and no changes in summer and winter. The O-3 increase in spring was caused by the net effect of more rapid decrease in NO titration and unchanged TVOC reactivity despite decreased TVOC mixing ratios, while the decreased local O-3 formation in autumn was mainly due to the reduction of aromatic VOC mixing ratios and the TVOC reactivity and much slower decrease in NO titration. However, the decreased in situ O-3 formation in autumn was overridden by the regional contribution, resulting in elevated O-3 observations. Furthermore, the OBM-derived relative incremental reactivity indicated that the O-3 formation was VOC-limited in all seasons, and that the long-term O-3 formation was more sensitive to VOCs and less to NOx and CO in the past 10 years. In addition, the OBM results found that the contributions of aromatics to O-3 formation decreased in all seasons of these years, particularly in autumn, probably due to the effective control of solvent-related sources. In contrast, the contributions of alkenes increased, suggesting a continuing need to reduce traffic emissions. The findings provide updated information on photochemical pollution and its impact in Hong Kong.
URI: http://hdl.handle.net/10397/75887
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-17-10919-2017
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