Observations of SO<sub>2</sub and NO₂ by mobile DOAS in the Guangzhou eastern area during the Asian Games 2010

• Main Authors: F. C. Wu, P. H. Xie, A. Li, K. L. Chan, A. Hartl, Y. Wang, F. Q. Si, Y. Zeng, M. Qin, J. Xu, J. G. Liu, W. Q. Liu, M. Wenig
• Format: Article
• Language: English
• Published: Copernicus Publications 2013-09-01
• Series: Atmospheric Measurement Techniques
• Online Access: http://www.atmos-meas-tech.net/6/2277/2013/amt-6-2277-2013.pdf

Mobile passive differential optical absorption spectroscopy measurements of SO₂ and NO₂ were performed in the Guangzhou eastern area (GEA) during the Guangzhou Asian Games 2010 from November 2010 to December 2010. The observations were carried out between 10:00 to 13:00 (local time, i.e., during daylight). Spatial and temporal distributions of SO₂ and NO₂ in this area were obtained and emission sources were determined using wind field data. The NO₂ vertical column densities were found to agree with Ozone Monitoring Instrument values. The correlation coefficient (referred to as <i>R</i>²) was 0.88 after cloud filtering within a specific ground pixel. During the Guangzhou Asian Games and Asian Paralympics (Para) Games, the SO₂ and NO_x emissions in the area were quantified using averaged wind speed and wind direction. For times outside the games the average SO₂ emission was estimated to be 9.50 ± 0.90 tons per hour and the average NO_x emission was estimated to be 5.87 ± 3.46 tons per hour. During the phases of the Asian and Asian Para Games, the SO₂ and NO_x emissions were reduced by 53.50% and 43.50%, respectively, compared to the usual condition. We also investigated the influence of GEA on Guangzhou University Town, the main venue located northwest of the GEA, and found that SO₂ concentrations here were about tripled by emissions from the GEA.