Please use this identifier to cite or link to this item:
PIRA download icon_1.1View/Download Full Text
Title: Trace gas measurements in coastal Hong Kong during the PEM‐West B 
Authors: Wang, T 
Lam, KS 
Chan, LY
Lee, ASY
Carroll, MA
Issue Date: 20-Dec-1997
Source: Journal of geophysical research. Atmospheres, 20 Dec. 1997, v. 102, no. D23, p. 28575-28588
Abstract: O₃, CO, NO[sub y], and SO₂ were measured at a coastal site in Hong Kong (22°13′N, 114°15′E, 60 m MSL) during the Pacific Exploratory Mission-West B (PEM-West B) in February and March 1994. Average concentrations determined in this study were 34±14 ppbv for O₃, 458±130 ppbv for CO, 9.33±7.84 ppbv for NO[sub y], and 1.31±1.46 ppbv for SO₂. Their high and variable levels suggest that the study site was often under the impact of fresh continental emissions (including urban Hong Kong) during the season of continental outflow. Concentrations of these species were strongly influenced by the passage of cold fronts and troughs which periodically brought high levels of pollutants from the north. Outflow of continental air was indicated by dramatic changes in meteorological parameters and in the levels of trace gas species. CO appeared to be a good chemical indicator of changes of air mass type, and its variability may be attributed to the relative strength of the outflow and to the transport of urban plumes. Variations of NO [sub y] and SO₂ appeared to be mainly dominated by local sources. O₃ was poorly and often negatively correlated with CO and NO[sub y], suggesting that air masses sampled in the study period were highly inhomogenous with respect to the chemical signatures and that O₃ was chemically titrated by anthropogenic pollutants during the early stages of continental outflow. Calculated isentropic trajectories captured large-scale changes of air masses, indicated also by surface meteorological and chemical data. Trajectory results offering finer resolutions would yield more insight into the histories of smaller-scale air masses. Finally, the reasons for apparent disagreement between trajectory results, surface winds, and sometimes chemical data require further investigation.
Publisher: Wiley-Blackwell
Journal: Journal of geophysical research. Atmospheres 
ISSN: 2169-897X
EISSN: 2169-8996
DOI: 10.1029/96JD03750
Rights: Copyright 1997 by the American Geophysical Union
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Wang_Gas_Measurements_PEM-West B.pdf1.23 MBAdobe PDFView/Open
Open Access Information
Status open access
File Version Version of Record
View full-text via PolyU eLinks SFX Query
Show full item record

Page views

Last Week
Last month
Citations as of May 28, 2023


Citations as of May 28, 2023


Last Week
Last month
Citations as of May 25, 2023


Last Week
Last month
Citations as of Jun 1, 2023

Google ScholarTM



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