Sulfuric acid-amine nucleation in urban Beijing.

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Date: Feb. 18, 2021
From: Atmospheric Chemistry and Physics(Vol. 21, Issue 4)
Publisher: Copernicus GmbH
Document Type: Brief article
Length: 251 words

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Abstract :

New particle formationÃá(NPF) is one of the major sources of atmospheric ultrafine particles. Due to the high aerosol and trace gas concentrations, the mechanism and governing factors for NPF in the polluted atmospheric boundary layer may be quite different from those in clean environments, which is however less understood. Herein, based on long-term atmospheric measurements from JanuaryÃá2018 to MarchÃá2019 in Beijing, the nucleation mechanism and the influences of H.sub.2 SO.sub.4 concentration, amine concentrations, and aerosol concentration on NPF are quantified. The collision of H.sub.2 SO.sub.4 -amine clusters is found to be the dominating mechanism to initialize NPF in urban Beijing. The coagulation scavenging due to the high aerosol concentration is a governing factor as it limits the concentration of H.sub.2 SO.sub.4 -amine clusters and new particle formation rates. The formation of H.sub.2 SO.sub.4 -amine clusters in Beijing is sometimes limited by low amine concentrations. Summarizing the synergistic effects of H.sub.2 SO.sub.4 concentration, amine concentrations, and aerosol concentration, we elucidate the governing factors for H.sub.2 SO.sub.4 -amine nucleation for various conditions.

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Gale Document Number: GALE|A652217455