Abstract
Abstract. Regional ozone pollution has become one of the top environmental concerns in China, especially in those economically vibrant and densely populated regions, such as North China region including Beijing. To address this issue, surface ozone and ancillary data over the period 2004–2006 from the Shangdianzi Regional Background Station in north China were analyzed. Due to the suitable location and valley topography of the site, transport of pollutants from the North China Plain was easily observed and quantified according to surface wind directions. Regional (polluted) and background (clean) ozone concentrations were obtained by detailed statistic analysis. Contribution of pollutants from North China Plain to surface ozone at SDZ was estimated by comparing ozone concentrations observed under SW wind conditions and that under NE wind conditions. The average daily accumulated ozone contribution was estimated to be 240 ppb·hr. The average regional contributions to surface ozone at SDZ from the North China Plain were 21.8 ppb for the whole year, and 19.2, 28.9, 25.0, and 10.0 ppb for spring, summer, autumn, and winter, respectively. The strong ozone contribution in summer led to disappearance of the spring ozone maximum phenomenon at SDZ under winds other than from the NNW to E sectors. The emissions of nitrogen oxide in the North China plain cause a decrease in ozone concentrations in winter.
Highlights
Being one of the greenhouse gases and a key oxidant, ozone plays important role in atmospheric energy budget and chemistry
Since wind direction gives an insight into the first order advection processes, its correlation with observed ozone data can provide the information about the impact of air-mass transport on the surface ozone variability
The average of the surface ozone concentration in the southwest sector for a given period can be considered as the typical value of the regional background ozone of the North China Plain for this period
Summary
Being one of the greenhouse gases and a key oxidant, ozone plays important role in atmospheric energy budget and chemistry. Analysis of surface ozone data from this station and focus the winds have strong diurnal variation with SW in the afteron the contributions of pollutants from North China Plain to noon and NE from midnight to the morning. A more general patterns (figures not shown here) are observed in many analysis of the reactive gases data from the station is given in other places to the south of SDZ in the North China plain, e.g. another paper (Meng et al, 2008). Polluted air masses from urban areas and satellite towns of Beijing, and even those regions in south of Beijing at North China Plain, can be transported to SDZ under southwesterly winds, while relatively clean air masses are transported to the site with winds from other directions. Meteorological data, including wind, temperature, relative humidity, and etc., are obtained from the site, with a resolution of 1 h
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