The aerosol–cloud interaction (ACI) and aerosol–radiation interaction (ARI) have notable influences on clouds, but their effects on fog are rarely analyzed before. Previous studies indicate that fog frequency in East China has been decreasing, and we further reveal that fog duration increases during 1960–2010. We hypothesize that this trend is related to the increase of aerosol pollution and perform WRF‐Chem simulations to study the ARI and ACI effects. Results show that ACI significantly advances fog formation, delays fog dissipation, and increases fog duration by about 1 h in a case study, while ARI has negligible effect. The more but smaller fog droplets produced in polluted conditions significantly inhibit droplet sedimentation and reduce solar radiation, therefore provide favorable conditions for the duration of fog. Under extremely polluted conditions, ACI effect also far overweighs ARI effect. To shorten the duration of dense fog, our findings suggest the necessity for mitigating emissions.

中文翻译：

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气溶胶对雾寿命的影响：观测证据和模型模拟

气溶胶-云相互作用（ACI）和气溶胶-辐射相互作用（ARI）对云有显着影响，但以前很少分析它们对雾的影响。先前的研究表明，华东地区的雾发生频率一直在下降，并且我们进一步揭示了1960–2010年期间的雾持续时间增加了。我们假设这种趋势与气溶胶污染的增加有关，并进行WRF-Chem模拟以研究ARI和ACI效应。结果表明，在一个案例研究中，ACI显着促进了雾的形成，延迟了雾的消散并增加了约1小时的雾持续时间，而ARI的影响可忽略不计。在受污染的条件下产生的雾滴越来越多但越小，它们会显着抑制液滴的沉降并减少太阳辐射，因此为雾的持续时间提供了有利的条件。在极度污染的条件下，ACI的影响也远大于ARI的影响。为了缩短浓雾的持续时间，我们的发现表明了减少排放的必要性。