The impact of the atmospheric turbulence-development tendency on new particle formation:a common finding on three continents

• 作者: Hao Wu Zhanqing Li Hanqing Li Kun Luo Yuying Wang Peng Yan Fei Hu Fang Zhang Yele Sun Dongjie Shang Chunsheng Liang Dongmei Zhang Jing Wei Tong Wu Xiaoai Jin Xinxin Fan Maureen Cribb Marc L.Fischer Markku Kulmala Tuukka Pet?j?
• 来源期刊: 国家科学评论（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: RESEARCH ARTICLES
• 页码范围: 135-145
• 页数: 11页
• 语种: 英文
• DOI: 10.1093/nsr/nwaa157

摘要

A new mechanism of new particle formation(NPF)is investigated using comprehensive measurements of aerosol physicochemical quantities and meteorological variables made in three continents,including Beijing,China;the Southern Great Plains site in the USA;and SMEAR Ⅱ Station in Hyyti?l?,Finland.Despite the considerably different emissions of chemical species among the sites,a common relationship was found between the characteristics of NPF and the stability intensity.The stability parameter(ζ = Z/L,where Z is the height above ground and L is the Monin-Obukhov length)is found to play an important role;it drops significantly before NPF as the atmosphere becomes more unstable,which may serve as an indicator of nucleation bursts.As the atmosphere becomes unstable,the NPF duration is closely related to the tendency for turbulence development,which influences the evolution of the condensation sink.Presumably,the unstable atmosphere may dilute pre-existing particles,effectively reducing the condensation sink,especially at coarse mode to foster nucleation.This new mechanism is confirmed by model simulations using a molecular dynamic model that mimics the impact of turbulence development on nucleation by inducing and intensifying homogeneous nucleation events.