Atmospheric Nanoparticle Survivability Reduction Due to Charge‐Induced Coagulation Scavenging Enhancement
Atmospheric Nanoparticle Survivability Reduction Due to Charge‐Induced Coagulation Scavenging Enhancement
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DOI：
10.1029/2021gl092758
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发表时间：
2021-04
影响因子：
5.2
通讯作者：
Naser G. A. Mahfouz;N. Donahue
中科院分区：
文献类型：
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作者：
Naser G. A. Mahfouz;N. Donahue
新粒子的形成对于气溶胶 - 云相互作用进而对气候至关重要。但新形成的粒子要成为云凝结核，就必须生长并避免被较大的背景粒子清除。尽管离子诱导的新粒子形成与生长最近受到了关注，但在此我们研究一种相反的效应，这种效应会削弱离子带来的增强作用，却较少受到关注：小的带电粒子因其电荷而被更有效地清除，因此其存活概率低于不带电的同类粒子。通过模拟，我们表明粒子的存活率有所降低，在某些情况下降幅显著，这与最新的理论预测相符。我们还表明，如果粒子通过中和作用失去电荷，带电粒子的存活率会提高；因此，要使离子诱导成核发挥重要作用，由此产生的带电粒子必须尽快变为中性。总体而言，电荷导致的凝聚清除增强效应理应会减弱离子在新粒子形成和生长过程中的影响。
New‐particle formation is important to aerosol–cloud interactions and thus climate, but for newly formed particles to become cloud condensation nuclei, they must grow and avoid scavenging by larger background particles. Whereas ion‐induced new‐particle formation and growth have received attention recently, here we study an opposing effect, blunting the enhancement due to ions, that has received less attention: Small charged particles are scavenged more efficiently due to their charge, and thus their survival probability is lower than that of their neutral counterparts. Through simulations, we show that particle survival is reduced, in some cases dramatically, matching updated theoretical predictions. We also show that the survival of charged particles is enhanced if particles lose their charge via neutralization; therefore, for ion‐induced nucleation to be important, the resulting charged particles must become neutral as soon as possible. Overall, the coagulation scavenging enhancement due to charge ought to lessen the influence of ions in new‐particle formation and growth.