北极黄河站秋季气团传输影响下大气气溶胶数谱分布特征

2013年9月在北极黄河站开展了气溶胶数谱(10~400 nm)的短期观测实验.数浓度小时平均值主要出现在300~400 cm~(-3),平均值为350 cm~(-3),高于新奥尔松Zeppelin全球大气本底站及环北极海洋大气7-9月航测报道的浓度.大气气溶胶的三个模态(核模态、爱根核模态和积聚模态)数浓度平均分别为35、122和193 cm~(-3).观测期间没有发生新粒子生成事件,平均数谱分布呈现双模态的分布特征,模态峰值分别出现在30 nm和115 nm,由积聚模态主导.平均数谱分布的几何中值粒径出现在约100~110 nm.从单颗粒分析结果来看,观测期间黄河站地区大气气溶胶主要以海盐气溶胶为主,但是在来自挪威海域和北欧大陆的气团影响下,也观测到煤烟颗粒、富硫颗粒物和含碳颗粒物等人为气溶胶.

The characteristics of atmospheric aerosol particle number size distribution in Arctic Yellow River Station influenced by long-range transport of autumn air mass

Measurement of particle number size distribution(PNSD)in the size range of 10~400 nm was car-ried out at Yellow River Station in Arctic in September 2013. During the measurement,it was found that the val-ue of hourly mean number concentration of 300~400 cm-3 presented most frequently,with a mean value of 350 cm-3. The number concentration was much higher than the values reported by the study at Zeppelin Station in Ny-?lesund and the cruises in the central Arctic between July and September. The number concentration of the three modes(nucleation mode,Aitken mode and accumulation mode)was 35,122 and 193 cm-3,respectively. There was no new particle formation event observed during the measurement. The PNSD was characterized by bimodal distribution,with one mode peaking at 30 nm and the other at 115 nm,respectively. The PNSD was dominated by the accumulation mode,with the geometric mean diameter of 100~110 nm. Based on the analysis of the indi-vidual particle samples,it was found that the chemical component during the measurement was mainly contribut-ed by the sea salt particles. However,when air mass from Norwegian Sea and Northern Europe became domi-nant,the soot particles,sulfur-rich and carbonaceous particles were also observed,revealing the influence by the anthropogenic emissions.