北京地区大气气溶胶的物理特征

PHYSICAL CHARACTERISTICS OF THE ATMOSPHERIC AEROSOLS IN BEIJING AREA

对1982年4月在北京沙河利用飞机取得的5份大气气溶胶资料进行综合分析,给出直径0.5—8.0μm气溶皮粒子数浓度和质量浓度的空间分布、谱分布.讨论了逆温、风和湿度等对大气气溶胶粒子的影响.

A number of aircraft observations were conducted to investigate the particle and mass concentration distributions of the atmospheric aerosol and the influences of inversion, wind and air humidity on the distributions at Northern suburb of Beijing in April, 1982. The maximum concentration of the atmospheric aerosol in Beijing area was 70cm(-3) or 0.182mg·m(-3).The maximum horizontal transmission flux was in the range of 0.27 to 2.26mg ·m(-2)·s(-1), which were recorded at an altitude between 0.7 and 2.2km above ground. The relation between the particle content (A) and altitude (z) in the bottom 4 km of the atmosphere obeyed the formula A = A0 exp (-bz), where A0 was 0.093 mg·m(-3) and b was 0.49km(-1) for particle concentration and A0 was 24cm(-3) and b was 0.81km(-1) for mass concentration respectively. The particle spectra could be fitted using formula DadN/dD= C,where α was around 2, showing deviation from Junge's spectrum.