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Atmospheric Chemistry Special Feature: Evidence for the role of organics in aerosol particle formation under atmospheric conditions

机译:大气化学专刊:有机物在大气条件下在气溶胶颗粒形成中的作用的证据

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摘要

New particle formation in the atmosphere is an important parameter in governing the radiative forcing of atmospheric aerosols. However, detailed nucleation mechanisms remain ambiguous, as laboratory data have so far not been successful in explaining atmospheric nucleation. We investigated the formation of new particles in a smog chamber simulating the photochemical formation of H2SO4 and organic condensable species. Nucleation occurs at H2SO4 concentrations similar to those found in the ambient atmosphere during nucleation events. The measured particle formation rates are proportional to the product of the concentrations of H2SO4 and an organic molecule. This suggests that only one H2SO4 molecule and one organic molecule are involved in the rate-limiting step of the observed nucleation process. Parameterizing this process in a global aerosol model results in substantially better agreement with ambient observations compared to control runs.
机译:大气中新的颗粒形成是控制大气气溶胶辐射强迫的重要参数。但是,详细的成核机制仍然不明确,因为迄今为止实验室数据尚未成功解释大气成核。我们研究了烟雾室内模拟H2SO4和有机可冷凝物质的光化学形成的新颗粒的形成。在H2SO4浓度下发生成核的过程类似于在成核过程中在周围大气中发现的浓度。测得的颗粒形成速率与H2SO4浓度与有机分子的乘积成正比。这表明在观察到的成核过程的限速步骤中仅涉及一个H2SO4分子和一个有机分子。与对照运行相比,在全局气溶胶模型中对该过程进行参数化可导致与环境观测的一致性更好。

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