摘要
对2004年的8、9月间机载PMS系统在北京及周边地区进行的不同天气状况下的8次气溶胶飞行观测资料进行了分析。结果表明,此观测期间,近地层以轻雾、霾为主。气溶胶浓度最大值的量级为102-104cm-3。阴天状况下气溶胶浓度最大,可达12 169 cm-3;晴空时最小,为783 cm-3。平均气溶胶浓度为102-103cm-3;直径最大值主要集中在0.28-0.47μm,平均值集中在0.21-0.31μm;风速较小的晴天和阴天都有可能使气溶胶浓度出现高值。大气有逆温层存在时,逆温层底有气溶胶粒子的明显累积。气溶胶粒子浓度谱为单峰分布。
The eight-flight aerosol data sampled with Passive Cavity Aerosol Spectrometer Probe （PCASP） and FSSP-100 probes of an airborne Particle Measurement System （PMS） in different atmospheric conditions during August to September in 2004 over Beijing and its surrounding areas were analyzed. The results show that due to the important effect of fog and haze near the surface, the maximum number concentration of aerosol changed from 10^2- 10^4 em^-3. The maximum number concentration could reach as high as 12 169 em^-3 in the cloudy condition while in the clean condition it could only be 783 em ^-3. The order of the mean number concentration was 10^2 - 10^3 em^-3. The maximum diameter of aerosol particles was primarily distributed around 0.29-0. 47μm and the mean diameter was around 0. 21-0. 31μm. The number concentration of aerosol particles could be high in both clean and cloudy condition when wind was week. In the temperature inversion condition, the distinct accumulation zone could be found under the inversion layers. The size distribution of aerosol follows unimodal distribution.
出处
《气候与环境研究》
CSCD
北大核心
2007年第1期49-62,共14页
Climatic and Environmental Research
基金
国家自然科学基金资助项目40333033
40575003
国家科技支撑计划课题2006BAC12B03
中国科学院知识创新项目KZCX3-SW-225
关键词
气溶胶
观测
机载PMS系统
aerosol, measurement, air borne Particle Measurement System
