HR: 0800h
AN: A11B-0379    [Abstracts]
TI: In-Situ Measurements Of Air Pollution Over China Loess Plateau During PACDEX
AU: Wang, X
EM: wxin0319@hotmail.com
AU: * Huang, J
EM: hjp@lzu.edu.cn
AU: Tian, W
EM: wstian@lzu.edu.cn
AU: Shi, J
EM: shijs06@lzu.cn
AU: Ji, M
EM: jimx04@lzu.cn
AB: Ground measurements of trace gases and mass concentration of dust aerosols were obtained from April 19 to May 31, 2007 at an integrated observational site of China (35.57N,104.08E), which is about 48 km away from the centre of Lanzhou city. The site is located at the southern bank of Yellow River in Gansu province, northwestern China, just on the so-called China-loess Plateau with an elevation of about 1965.8 m above sea level. The instantaneous volume mixing ratios of CO, SO2, NOx and O3 are measured continuously along with the size distribution of atmospheric aerosols in the 10 nm diameter range. Average mass concentration of black carbon is also collected during this experiment. The light scattering coefficients measured derived from single-wavelength nephelometer for 450, 520, 700nm. Overall, there is a very good agreement between scattering coefficients and PM10 for the time period observations, especially during dust events. The objective of this study is to understand the detailed characteristics and underlying mechanisms of air pollution in Lanzhou and its potential impacts on the regional/global climate. Preliminary analysis shows that the hourly mean volume mixing ratios of O3, CO, SO2, NOx are 48.67 ppb, 609.12 ppb, 8.10 ppb, and 6.89 ppb£¬respectively. During a dust storm event, the mass concentration of particulates (PM10) can rise to 2484.72 ug/m3, about 13 times as high as that in non-dust storm days. Dust plumes are transported from the surface to a long distance from their sources and have a significant influence on regional air quality in this region. The meteorological analysis indicates that these polluted layers are not from local sources.
UR: http://climate.lzu.edu.cn/~jhuang/people/wx/Xin_Wang.htm
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0490 Trace gases
DE: 6015 Dust
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting