Polluted dust promotes new particle formation and growth
Polluted dust promotes new particle formation and growth
复制标题
受污染的灰尘促进新颗粒的形成和生长
DOI：
10.1038/srep06634
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发表时间：
2014-10-16
影响因子：
4.6
通讯作者：
Kulmala, Markku
中科院分区：
文献类型：
--
作者：
Nie, Wei;Ding, Aijun;Kulmala, Markku
了解新粒子的形成及其随后在对流层中的增长对我们预测大气成分和全球气候变化的能力具有至关重要的影响。人们认为，由于高冷凝和凝结汇，预先存在的高颗粒负荷可以抑制新的大气气溶胶颗粒的形成。在此，基于对华南山区的现场测量，我们首次报告了在重尘天气与人为污染混合期间，偏远环境大气中新颗粒形成和生长的现场观测证据。在灰尘事件期间，直径范围为 15–50 nm 的颗粒的形成和生长速率均有所增强，表明光诱导、灰尘表面介导的反应以及由此产生的可凝结蒸汽的影响。这项研究提供了对真实大气中诱导新颗粒形成和生长的异质光化学过程的独特现场观察，并表明矿物尘埃对气候和大气化学产生意想不到的影响。
Understanding new particle formation and their subsequent growth in the troposphere has a critical impact on our ability to predict atmospheric composition and global climate change. High pre-existing particle loadings have been thought to suppress the formation of new atmospheric aerosol particles due to high condensation and coagulation sinks. Here, based on field measurements at a mountain site in South China, we report, for the first time, in situ observational evidence on new particle formation and growth in remote ambient atmosphere during heavy dust episodes mixed with anthropogenic pollution. Both the formation and growth rates of particles in the diameter range 15–50 nm were enhanced during the dust episodes, indicating the influence of photo-induced, dust surface-mediated reactions and resulting condensable vapor production. This study provides unique in situ observations of heterogeneous photochemical processes inducing new particle formation and growth in the real atmosphere and suggests an unexpected impact of mineral dust on climate and atmospheric chemistry.