Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66558
Title: Spatiotemporal variation of ozone precursors and ozone formation in Hong Kong : grid field measurement and modelling study
Authors: Lyu, XP
Liu, M
Guo, H
Ling, ZH
Wang, Y
Louie, PKK
Luk, CWY
Keywords: VOCs
Source apportionment
Photochemical O-3
Eulerian box model
MCM
Issue Date: 2016
Publisher: Elsevier
Source: Science of the total environment, 1 Nov. 2016, v. 569, p. 1341-1349 How to cite?
Journal: Science of the total environment 
Abstract: Grid field measurements of volatile organic compounds (VOCs) covering the entire territory of Hong Kong were simultaneously carried out twice daily on 27 September 2013 and 24 September 2014, respectively, to advance our understanding on the spatiotemporal variations of VOCs and ozone (O-3) formation, the factors controlling O-3 formation and the efficacy of a control measure in Hong Kong. From before to after the control measure on liquefied petroleum gas (LPG) fueled vehicles, the VOCs originated from LPG vehicle exhaust deceased from 41.3 +/- 1.2 mu g/m(3) (49.7 +/- 1.5%) to 32.8 +/- 1.4 mu g/m(3) (38.8 +/- 1.7%) (p < 0.05). In contrast, the contribution to VOCs made by gasoline and diesel vehicle exhaust and solvent usage increased (p < 0.05). VOCs and nitric oxide (NO) in LPG source experienced the highest reductions at the roadside sites, while the variations were not significant at the urban and new town sites (p > 0.05). For O-3 production, LPG vehicle exhaust generally made a negative contribution (-0.17 +/- 0.06 ppbv) at the roadside sites, however it turned to a slightly positive contribution (0.004 +/- 0.038 ppbv) after the control measure. At the urban sites, although the reductions of VOCs and NO were minor (p > 0.05), O-3 produced by LPG vehicle significantly reduced from 4.19 +/- 1.92 ppbv to 0.95 +/- 0.38 ppbv (p < 0.05). Meanwhile, O-3 produced by LPG at the new town sites remained stable. The analysis of O-3-precursor relationships revealed that alkenes and aromatics were the main species limiting roadside O-3 formation, while aromatics were the most predominant controlling factor at urban and new town sites. In contrast, isoprene and sometimes NOx limited the O-3 formation in rural environment.
URI: http://hdl.handle.net/10397/66558
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2016.06.214
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

1
Last Week
0
Last month
Citations as of Oct 15, 2017

Page view(s)

15
Last Week
2
Last month
Checked on Oct 16, 2017

Google ScholarTM

Check

Altmetric



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