HR: 09:28h
AN: A31E-06    [Abstracts]
TI: Impact of Chinese Megacities on Regional Air Quality: An Overview of 2005 Summer Field Studies in Beijing and Shanghai
AU: * Wang, T
EM: cetwang@polyu.edu.hk
AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Poon, S
A31E-06 AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Gao, J
A31E-06 AF: Shandong University, Environment Research Institute, Shandong University, Jinan, 250100
AU: Wu, W
A31E-06 AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Zhou, Z
A31E-06 AF: Shandong University, Environment Research Institute, Shandong University, Jinan, 250100
AU: Cheung, J
A31E-06 AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Wong, A
A31E-06 AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Ding, A
A31E-06 AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Kowk, J
A31E-06 AF: Hong Kong Polytechnic University, 1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, NA
AU: Blake, D R
A31E-06 AF: University of California, Irvine, Department of Chemistry, University of California, Irvine, Irvine, Ca 92697
AB: Photochemical oxidants and aerosols can be produced in urban plumes as they are transported to surrounding rural areas, which can cause damage to agricultural crops and forest, and alter regional climate. Despite recognition of severe air pollution in major Chinese cities, there is limited research on the extent of impact of urban pollution on regional air quality and ecosystem. In this study we present an overview of the field campaigns conducted in summer 2005 at a suburban/rural site downwind Beijing and Shanghai to examine the extent and processes governing the formation of ozone and secondary particles. Ozone, aerosols (size, chemistry, and optical properties), their precursor gases (NOy, SO2, VOC, CO) were measured for six weeks at each site. High concentrations of ozone and fine aerosols were observed, with 1-hour ozone mixing ratio reaching 286 ppbv at the Beijing site on one occasion. This is the highest value for China reported in literatures indicating severe photochemical pollution due to rapid increase in vehicular emissions associated with fast urbanization in many Chinese cities. We will describe initial result on the variations in gases and aerosol parameters, and examine the relationships between them to infer sources and formation processes. Cases of pollution events will also be examined to show the coupling between gaseous and aerosol pollution. The results from our studies have important implications for assessing urban pollution on regional atmospheric environment in major regions of China.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005