The Role of Sulfuric Acid in Atmospheric Nucleation
The Role of Sulfuric Acid in Atmospheric Nucleation
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DOI：
10.1126/science.1180315
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发表时间：
2010-03-05
期刊：
影响因子：
56.9
通讯作者：
Kulmala, Markku
中科院分区：
文献类型：
--
作者：
Sipila, Mikko;Berndt, Torsten;Kulmala, Markku
成核是大气新粒子形成的基本步骤。然而，关于成核的实验室实验系统地未能证明硫酸颗粒的形成速率与考虑环境大气浓度所需的速率一样高，并且硫酸在大气成核中的作用仍然是一个谜。在这里，我们报告了在与大气相关的硫酸浓度下形成后立即观察到的新颗粒（直径约为 1.5 纳米）的测量结果。此外，我们表明，测量的成核率和硫酸浓度之间的相关性表明，新形成的颗粒含有一到两个硫酸分子，这个数字与基于大气观测的假设一致。将这些发现纳入全球模型应该可以增进对二次粒子形成对气候影响的理解。
Nucleation is a fundamental step in atmospheric new-particle formation. However, laboratory experiments on nucleation have systematically failed to demonstrate sulfuric acid particle formation rates as high as those necessary to account for ambient atmospheric concentrations, and the role of sulfuric acid in atmospheric nucleation has remained a mystery. Here, we report measurements of new particles ( with diameters of approximately 1.5 nanometers) observed immediately after their formation at atmospherically relevant sulfuric acid concentrations. Furthermore, we show that correlations between measured nucleation rates and sulfuric acid concentrations suggest that freshly formed particles contain one to two sulfuric acid molecules, a number consistent with assumptions that are based on atmospheric observations. Incorporation of these findings into global models should improve the understanding of the impact of secondary particle formation on climate.