Key features of new particle formation events at background sites in China and their influence on cloud condensation nuclei  

作　　者：Xiaojing SHEN Junying SUN Xiaoye ZHANG Yangmei ZHANG Lu ZHANG Ruxia FAN 

机构地区：[1]State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China [2]State Key Laboratory of Cryospheric Sciences, Cold and-Arid Region Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China [3]College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Frontiers of Environmental Science & Engineering》2016年第5期107-117,共11页环境科学与工程前沿（英文）

基　　金：This work was supported by National Basic Research Program of China （No. 2011CB403401）, the National Natural Science Foundation of China （Grant Nos. 41175113 and 41405132）, CAMS Basis Research Project （Nos. 2013Z007 and 2013Y004）. This paper is partially supported by the CMA Innovation Team for Haze-fog Observation and Forecasts. The authors would also like to thank the staff at Shangdianzi, Linan and Mr. Tai for operating and maintaining the instruments and the Leibniz Institute for Tropospheric Research for providing the TDMPS used at the SDZ station.

摘　　要：Long-term continuous measurements of particle number size distributions with mobility diameter sizes ranging from 3 to 800 nm were pertbrmed to study new particle formation （NPF） events at Shangdianzi （SDZ）, Mt. Tai （TS）, and Lin＇an （LAN） stations representing the background atmospheric conditions in the North China Plain （NCP） Central East China （CEC） and Yangtze River Delta （YRD） regions, respectively. The mean formation rate of 3-nm particles was 6.3, 3.7, and 5.8 cm -3 .s-1, and the mean particle growth rate was 3.6, 6.0, and 6.2 nm. h at SDZ, TS, and LAN, respectively. The NPF, event characteristics at the three sites indicate that there may be a stronger source of low volatile vapors and higher condensational sink of pre-existing particles in the YRD region. The formation rate of NPF events at these sites, as well as the condensation sink, is approximately 10 times higher than some results reported at rural/urban sites in western countries. However, the growth rates appear to be 1 2 times higher. Approximately 12%-17% of all NPF events with nucleated particles grow to a climate- relevant size （〉50 nm）. These kinds of NPF events were normally observed with higher growth rate than the other NPF cases. Generally, the cloud condensation nuclei （CCN） number concentration can be enhanced by approximately a factor of 2 6 on these event days. The mean value of the enhancement factor is lowest at LAN （2-3） and highest at SDZ （-4）. NPF events have also been found to have greater impact on CCN production in China at the regional scale than in the other background sites worldwide.Long-term continuous measurements of particle number size distributions with mobility diameter sizes ranging from 3 to 800 nm were pertbrmed to study new particle formation （NPF） events at Shangdianzi （SDZ）, Mt. Tai （TS）, and Lin＇an （LAN） stations representing the background atmospheric conditions in the North China Plain （NCP） Central East China （CEC） and Yangtze River Delta （YRD） regions, respectively. The mean formation rate of 3-nm particles was 6.3, 3.7, and 5.8 cm -3 .s-1, and the mean particle growth rate was 3.6, 6.0, and 6.2 nm. h at SDZ, TS, and LAN, respectively. The NPF, event characteristics at the three sites indicate that there may be a stronger source of low volatile vapors and higher condensational sink of pre-existing particles in the YRD region. The formation rate of NPF events at these sites, as well as the condensation sink, is approximately 10 times higher than some results reported at rural/urban sites in western countries. However, the growth rates appear to be 1 2 times higher. Approximately 12%-17% of all NPF events with nucleated particles grow to a climate- relevant size （〉50 nm）. These kinds of NPF events were normally observed with higher growth rate than the other NPF cases. Generally, the cloud condensation nuclei （CCN） number concentration can be enhanced by approximately a factor of 2 6 on these event days. The mean value of the enhancement factor is lowest at LAN （2-3） and highest at SDZ （-4）. NPF events have also been found to have greater impact on CCN production in China at the regional scale than in the other background sites worldwide.

关 键 词：New particle formation Regional background Cloud condensation nuclei Growth rate Formation rate 

分 类 号：TP393.092[自动化与计算机技术—计算机应用技术] X513[自动化与计算机技术—计算机科学与技术]