Ice-nucleating particle concentrations unaffected by urban air pollution in Beijing, China
Ice-nucleating particle concentrations unaffected by urban air pollution in Beijing, China
复制标题
中国北京的冰核颗粒浓度不受城市空气污染的影响
DOI：
10.5194/acp-18-3523-2018
复制
发表时间：
2018-03-12
影响因子：
6.3
通讯作者：
Wex, Heike
中科院分区：
文献类型：
--
作者：
Chen, Jie;Wu, Zhijun;Wex, Heike
抽象的。 Exceedingly high levels of PM2.5 with complex chemical composition occur frequently in China.据推测
whether anthropogenic PM2.5 may significantly contribute to ice-nucleating particles (INP).然而，很少有研究关注
城市颗粒的冰核特性。在这项工作中，两个冰核液滴阵列被用来确定
atmospheric number concentration of INP ( NINP ) in the range from − 6 to − 25 ∘C in Beijing.否
correlations between NINP and either PM2.5 or black carbon mass concentrations were found, although both
在采样期间变化超过 30 倍。同样，NINP 和 NINP 之间也没有相关性。
总颗粒数浓度或直径 >500 nm 的颗粒数浓度。此外，
there was no clear difference between day and night samples.所有这些结果表明，北京的空气污染并没有加剧或减少。
decrease INP concentrations in the examined temperature range above values observed in nonurban areas;因此，背景INP
concentrations might not be anthropogenically influenced as far as urban air pollution is concerned, at least in the examined
温度范围。
Abstract. Exceedingly high levels of PM2.5 with complex chemical composition occur frequently in China. It has been speculated
whether anthropogenic PM2.5 may significantly contribute to ice-nucleating particles (INP). However, few studies have focused on the
ice-nucleating properties of urban particles. In this work, two ice-nucleating droplet arrays have been used to determine the
atmospheric number concentration of INP ( NINP ) in the range from − 6 to − 25 ∘C in Beijing. No
correlations between NINP and either PM2.5 or black carbon mass concentrations were found, although both
varied by more than a factor of 30 during the sampling period. Similarly, there were no correlations between NINP and
either total particle number concentration or number concentrations for particles with diameters >500 nm . Furthermore,
there was no clear difference between day and night samples. All these results indicate that Beijing air pollution did not increase or
decrease INP concentrations in the examined temperature range above values observed in nonurban areas; hence, the background INP
concentrations might not be anthropogenically influenced as far as urban air pollution is concerned, at least in the examined
temperature range.