Distribution and origin of aerosol and its transform relationship with CCN derived from the spring multi-aircraft measurements of Beijing Cloud Experiment(BCE)  

作　　者：LU GuangXian GUO XueLiang 

机构地区：[1]Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [2]Chinese Academy of Meteorological Sciences,Beijing 100081,China [3]Graduate University of the Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Science Bulletin》2012年第19期2460-2469,共10页

基　　金：supported by the Research and Development Special Fund for Public Welfare Industry (Meteorology) (GYHY200806001);the Key Project in the National Science & Technology Pillar Program (2006BAC12B03)

摘　　要：The atmospheric aerosol distribution,source and relationship with cloud condensation nuclei(CCN) observed during the Beijing Cloud Experiment(BCE) are analyzed.The results show that the high number concentrations of aerosol mainly distributed below 4500 m,and the magnitude could reach to 103 cm 3.Above 4500 m,the aerosol number concentrations decreased to 101 cm 3 as the altitude increases,and the aerosol mean diameters were between 0.16 and 0.19 μm.Below 4500 m,the number size distributions of aerosol showed a bimodal(multimodal) mode,and an unimodal mode above it.Due to the different sources of aerosol,the conversion ratios of aerosol to CCN were less than 20% below 4500 m,and reached 50% above the level at 0.3% supersaturation.The back trajectories showed that aerosols at higher levels above 4500 m were strongly affected by large-size particles and those below 4500 m were strongly affected by local or regional pollution.Based on observations,a relationship between the CCN number concentration and aerosol number concentration is established.The atmospheric aerosol distribution, source and relationship with cloud condensation nuclei （CCN） observed during the Beijing Cloud Experiment （BCE） are analyzed. The results show that the high number concentrations of aerosol mainly distributed below 4500 m, and the magnitude could reach to 103 cm-3. Above 4500 m, the aerosol number concentrations decreased to 101 cm-3 as the altitude increases, and the aerosol mean diameters were between 0.16 and 0.19 gm. Below 4500 m, the number size distribu- tions of aerosol showed a bimodal （multimodal） mode, and an unimodal mode above it. Due to the different sources of aerosol, the conversion ratios of aerosol to CCN were less than 20% below 4500 m, and reached 50% above the level at 0.3% supersatura- tion. The back trajectories showed that aerosols at higher levels above 4500 m were strongly affected by large-size particles and those below 4500 m were strongly affected by local or regional pollution. Based on observations, a relationship between the CCN number concentration and aerosol number concentration is established.

关 键 词：大气气溶胶 实验测量 CCN BCE 北京 飞机 起源 云凝结核 

分 类 号：X513[环境科学与工程—环境工程] TG142.31[一般工业技术—材料科学与工程]