In the summers of 2002-2003, acidic gases, ammonia and water-soluble ions in PM10 were measured in Beijing. The mean concentrations of HCl, HONO, HNO3, SO2 and NH3 are 0.6, 3.6, 1.9, 14.1 and 16.6 mu g m(-3), respectively, and 2.2, 14.6, 19.3 and 8.9 mu g m(-3) for Cl-, NO-, SO2- and NH4+ in PM10. The concentrations of secondary ions in PM10 are found to have strong dependence on the pathway of trajectories. The most frequent southerly air flow is connected with high concentrations of secondary water-soluble ions during summertime. Other trajectories with northwest and north direction lead to lower concentrations of secondary ions. Hebei and Shandong Provinces and the Tianjin Municipality are the main source areas for sulfate as identified by Potential Source Contribution Function. This result emphasizes that the non-Beijing sources play an important role in the sulfate mass concentration in the urban atmosphere of Beijing and validates conclusions based on model calculations for the region. (C) 2009 Elsevier Ltd. All rights reserved.
ISI Document Delivery No.: 487SETimes Cited: 41Cited Reference Count: 57Wu, Zhijun Hu, Min Shao, Kesheng Slanina, JacobWu, Zhijun/A-7041-2012National Natural Science Foundation of China ; Ministry of Science and Technology [2006BAI19B06]; EUCAARI (European Integrated project on Aerosol Cloud Climate and Air Quality interactions) [036833-2]This work was supported by the National Natural Science Foundation of China (20637020), the National Key Technologies R&D Program in the Eleventh Five-year Plan Period from the Ministry of Science and Technology (2006BAI19B06) and EUCAARI (European Integrated project on Aerosol Cloud Climate and Air Quality interactions) No. 036833-2. We greatly acknowledge National Oceanic and Atmospheric Administration Air Resources Laboratory (NOAA ARL) for HYSPLIT transport and dispersion model. The authors would like to thank Dr. Yaqiang Wang for contributing their software "TrajStat". Here, we deeply cherish the memory of Prof Jacob (Sjaak) Slanina, who passed away on March 23, 2009, and appreciate his invention of SJAC and contribution to atmospheric chemistry.49145Pergamon-elsevier science ltdOxford