Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5803
Title: Tropospheric ozone climatology over Beijing : analysis of aircraft data from the MOZAIC program
Authors: Ding, AJ
Wang, T 
Thouret, V
Cammas, J
Nédélec, P
Keywords: Airborne survey
Atmospheric pollution
Climatology
Concentration (composition)
Northern Hemisphere
Ozone
Photochemistry
Pollutant transport
Seasonal variation
Troposphere
Urban atmosphere
Vertical distribution
Water vapor
Issue Date: 4-Jan-2008
Publisher: Copernicus GmbH
Source: Atmospheric chemistry and physics, 4 Jan. 2008, v. 8, no. 1, p. 1-13 How to cite?
Journal: Atmospheric chemistry and physics 
Abstract: Ozone (O₃) profiles recorded over Beijing from 1995 to 2005 by the Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC) program were analyzed to provide a first climatology of tropospheric O₃over Beijing and the North China Plains (NCPs), one of the most populated and polluted regions in China. A pooled method was adopted in the data analysis to reduce the influence of irregular sampling frequency. The tropospheric O₃over Beijing shows a seasonal and vertical distribution typical of mid-latitude locations in the Northern Hemisphere, but has higher daytime concentrations in the lower troposphere, when compared to New York City, Tokyo, and Paris at similar latitude. The tropospheric O₃over Beijing exhibits a common summer maximum and a winter minimum, with a broad summer maximum in the middle troposphere and a narrower early summer (June) peak in the lower troposphere. Examination of meteorological and satellite data suggests that the lower tropospheric O₃maximum in June is a result of strong photochemical production, transport of regional pollution, and possibly also more intense burnings of biomass in Central-Eastern China. Trajectory analysis indicates that in summer the regional pollution from the NCPs, maybe mixed with urban plumes from Beijing, played important roles on the high O₃concentrations in the boundary layer, but had limited impact on the O₃concentrations in the middle troposphere. A comparison of the data recorded before and after 2000 reveals that O₃in the lower troposphere over Beijing had a strong positive trend (approximately 2% per year from 1995 to 2005) in contrast to a flat or a decreasing trend over Tokyo, New York City, and Paris, indicating worsening photochemical pollution in Beijing and the NCPs.
URI: http://hdl.handle.net/10397/5803
ISSN: 1680-7316
EISSN: 1680-7324
DOI: 10.5194/acp-8-1-2008
Rights: © Author(s) 2008. This work is licensed under a Creative Commons License.
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