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| 1 | 北京夏季高温高湿和降水过程对大气颗粒物谱分布的影响显示文摘2004—07—13~2004—08—23使用TDMPS-APS系统在线测量颗粒物的数浓度谱分布,并于07—16~07—18选取了高温闷热夜晚、日间高温高湿和雨后晴朗干洁3种天气条件,使用多级串联撞击式采样器(MOUDI)测量颗粒物的质量浓度谱分布,结果表明,高温高湿天气条件下颗粒物的污染、尤其细粒子污染严重,导致很低的能见度(2.5km);PM1.8和PM10的质量浓度分别为170.68μg/m^3和249.35μg/m^3,细粒子质量浓度占PM10的68%;粒径为50~100nm颗粒物的数浓度最高,为2×10^4~3×10^4个/cm^3;降雨过程对粗粒子和细粒子均有去除作用,对细粒子的去除作用尤为明显;降雨后PM10和PM1.8浓度分别比降雨前降低3倍和6倍;降雨过后的晴朗干洁天气有利于新粒子(3~20nm)的生成,生成的新粒子快速长大到50~100nm;随着污染物的累积,以后几天内又变为污染天气. | 胡敏 刘尚 吴志军 张静 赵云良 Birgit Wehner Alfred Wiedensohler | 2006 | 环境科学2006，27，11： | 117 |
| 2 | 重污染和新粒子生成过程中城市大气颗粒物数谱分布演变过程显示文摘使用双电迁移性颗粒物粒径谱分析仪和空气动力学颗粒物粒径谱分析仪对北京城市大气颗粒物(3nm^10μm)数浓度谱分布进行长期观测.选取2006年春节期间出现的一次重污染事件和一次新粒子生成过程,对期间颗粒物数谱分布特征及演变过程进行分析.在重污染事件中3~10nm颗粒物(平均数浓度46cm?3)几乎在大气中消失,而新粒子生成事件中核模态颗粒物数浓度最高达到3.5×104cm?3.这种现象可以通过颗粒物的碰并汇和低挥发性气态前体物的凝结汇从颗粒物的汇和源两个角度进行解释:重污染事件中,3~10nm颗粒物的碰并汇为1.1×10?2~1.2×10?3s?1,显著高于新粒子生成过程(9.9×10?4~1.4×10?4s?1);在新粒子生成过程中,参与成核的低挥发性气态前体物的凝结汇为0.01s?1,显著低于重污染事件(0.13s?1).研究结果表明在分析极端大气环境中的颗粒物数谱分布时,除交通和气象因素外,碰并和凝结过程的影响也需要给予足够的重视. | 吴志军 胡敏 岳玎利 Birgit WEHNER Alfred WIEDENSOHLEP | 2011 | 中国科学:地球科学2011，41，8： | 17 |
| 3 | Evolution of particle number size distribution in an urban atmosphere during episodes of heavy pollution and new particle formation显示文摘This study discusses the evolution of particle number size distribution during episodes of heavy pollution and new particle formation in the urban atmosphere of Beijing to quantify the effects of dynamic processes (coagulation and condensation) on the particle number size distribution.During a heavy-pollution event,an extremely low number concentration of 3-10 nm particles (on average 46 cm-3) was observed.This is because nucleation-mode particles were easily removed by strong coagulational scavenging of larger particles under this condition.In addition,a large condensation sink (on average 0.13 s-1) restrained nucleation,which is one of the major sources of nucleation-mode particles.Conversely,during a new-particle formation event,the small condensation sink (0.01 s-1) of precursor facilitated nucleation.At the same time,preexisting particles had little ability to scavenge newly formed particles (around 1 nm) and allowed them to grow to a detectable size (larger than 3 nm currently).We suggest that the effects of dynamic processes (coagulation and condensation) on particle size distribution should be stressed under some extreme conditions of the relatively polluted urban atmosphere in addition to traffic and meteorological factors. | WU ZhiJun, HU Min YUE DingLi Birgit WEHNER Alfred WIEDENSOHLER | 2011 | Science China Earth Sciences2011，54，11： | 8 |
| 4 | Aerosol number size distribution and new particle formation at a rural/coastal site in Pearl River Delta (PRD) of China显示文摘 | Shang Liu Min Hu Zhijun Wu Birgit Wehner Alfred Wiedensohler Yafang Cheng | 2008 | Atmospheric Environment2008，，25： | 1 |
| 5 | Particle number size distribution in the urban atmosphere of Beijing, China显示文摘 | Zhijun Wu Min Hu Peng Lin Shang Liu Birgit Wehner Alfred Wiedensohler | 2008 | Atmospheric Environment2008，，34： | 1 |
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