Role of iodine oxoacids in atmospheric aerosol nucleation
Role of iodine oxoacids in atmospheric aerosol nucleation
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DOI：
10.1126/science.abe0298
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发表时间：
2021-02-05
期刊：
影响因子：
56.9
通讯作者：
Sipila, Mikko
中科院分区：
文献类型：
--
作者：
He, Xu-Cheng;Tham, Yee Jun;Sipila, Mikko
已知碘酸（HIO 3）在沿海海洋区域形成气溶胶颗粒，但缺乏预测的成核和生长速率。使用CERN CLOUD（Cosmics Leaving Outdoor Droplets）室，我们发现HIO 3粒子的成核速率非常快，甚至超过了类似条件下的硫酸-氨速率。我们还发现，离子诱导成核涉及IO 3-和HIO 3的顺序添加，并且它在低于+10摄氏度的动力学极限下进行。相比之下，中性成核涉及重复顺序添加亚碘酸（HIO 2），然后添加HIO 3，表明HIO 2起着关键的稳定作用。新形成的颗粒几乎完全由HIO 3组成，其在动力学极限下驱动颗粒快速生长。我们的测量表明，碘含氧酸颗粒的形成可以与大气中的原始区域的硫酸竞争。
Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. Using the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber, we find that the nucleation rates of HIO3 particles are rapid, even exceeding sulfuric acid-ammonia rates under similar conditions. We also find that ion-induced nucleation involves IO3- and the sequential addition of HIO3 and that it proceeds at the kinetic limit below +10 degrees C. In contrast, neutral nucleation involves the repeated sequential addition of iodous acid (HIO2) followed by HIO3, showing that HIO2 plays a key stabilizing role. Freshly formed particles are composed almost entirely of HIO3, which drives rapid particle growth at the kinetic limit. Our measurements indicate that iodine oxoacid particle formation can compete with sulfuric acid in pristine regions of the atmosphere.