Contributions of pollutants from North China Plain to surface ozone at the Shangdianzi GAW Station

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][2005][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.

Ozone concentrations, flux and potential effect on yield during wheat growth in the Northwest-Shandong Plain of China

“…Diurnal variation patterns (particularly the peak times) are not the same in different areas. Our results agree well with the typical diurnal patterns for O 3 concentration at low-elevation locations (Kelly et al, 1984;Lin et al, 2008). However, it differed from the patterns from high-elevation sites.…”

“…The mean O 3 concentration during the growing seasons was 31.3 ± 22.3 ppbV. The diurnal variation of O 3 concentration depends on the balance of many factors affecting O 3 formation (e.g., local photochemical reactions and horizontal or vertical transport) and destruction (e.g., deposition or chemical reactions) (Crutzen et al, 1999;Cape, 2008;Lin et al, 2008). In the early afternoon, in spite of the gradual decrease of radiation, the increasing temperature resulted in higher levels of chemical precursors, which then led to the rise in O 3 concentration.…”

Nitrogen dioxide measurement by cavity attenuated phase shift spectroscopy (CAPS) and implications in ozone production efficiency and nitrate formation in Beijing, China

“…This is evident from the diurnal cycle of NO (Figure 4a), which shows a pronounced morning peak. The NO concentration peaks between 7:00 and 8:00 (~17 ppb) and then gradually decreases to a low ambient level (~1 ppb) due to the titration of NO by O 3 , and also the rising boundary layer during the daytime [Lin et al, 2008.…”

Based on Mathematical Modeling Method of Air Quality Evaluation Method Research

“…The results showed that the factors significantly related to PM2.5 were SO 2, NO 2 and CO in spring; O 3 and CO in summer; SO 2, NO 2 and CO in autumn and SO2, NO 2, CO, O 3 in winter, respectively [5,6] ． (2) The concentration of PM10 was highly affected by season and climate, for example, PM10 was significantly influenced by coal in heating period, but by sandstorm weather in non-heating period. The concentration of PM2.5, SO 2 and NO 2 all increased in heating period, while SO 2 was the most sensitive pollutant.…”