Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 3 2008 10.5194/acpd-8-9405-2008 http://www.atmos-chem-phys-discuss.net/8/9405/2008/ http://www.atmos-chem-phys-discuss.net/8/9405/2008/acpd-8-9405-2008.html http://www.atmos-chem-phys-discuss.net/8/9405/2008/acpd-8-9405-2008.pdf 9405 9433 2008-05-23 Characteristics of trace gaseous pollutants at a regional background station in Northern China Z. Y. Meng mengzy@cams.cma.gov.cn X. B. Xu P. Yan G. A. Ding J. Tang W. L. Lin X. D. Xu S. F. Wang Key Laboratory for Atmospheric Chemistry, Center for Atmosphere Watch and Services, Chinese Academy of Meteorological Sciences, Beijing 100081, China We present measurement results of trace gaseous pollutants obtained at the Shangdianzi (SDZ) Global Atmosphere Watch (GAW) regional station in Northern China, from September 2003 to December 2006. The gases include ozone (O₃), nitrogen oxide(s) (NO_x=NO+NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO). During the study period, the mean annual O₃ concentrations were 30.1±21.0, 32.8±19.1 and 30.9±19.8 ppbv in 2004, 2005 and 2006. The corresponding NO_x values were 14.5±14.0, 11.0±11.3 and 12.7±11.8 ppbv, respectively. The mean annual SO₂ concentrations were 5.9±10.0, 6.1±9.9 and 7.6±10.2 ppbv in 2004, 2005 and 2006, while the mean CO levels were 586±415 and 742±558 ppbv in 2005 and 2006. The data obtained at SDZ station are compared with the results measured at other background sites in China as well as abroad. The concentrations of O₃, NO_x, SO₂, and CO at the SDZ background station are found to have clear seasonal and diurnal variations. The impacts of local and remote pollution sources on the regional air quality are assessed using trace gases concentration roses and 3-day back trajectories of air masses arriving at the SDZ station. Cape, J. N., Methven, J., and Hudson, L. 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