Impacts of high anthropogenic aerosol levels on fog evolution in the North China Plain: A case-based physical mechanistic analysis

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2025-08-07 DOI:10.1016/j.atmosres.2025.108414

Tingting Ju , Bingui Wu , Jianbo Yang , Meng Tian , Yunchen Liao , Hailing Liu

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引用次数: 0

Abstract

Existing findings regarding the impacts of aerosol concentrations on fog are inconsistent and have primarily focused on the influence of low aerosol levels. In this study, the effects of high aerosol levels on fog were investigated using the WRF-Chem model to assess the extent to which aerosol levels affect fog in the North China Plain (NCP). The results showed that liquid water content (LWC), fog duration, and fog-top heights all increased nonlinearly with increasing aerosol concentrations, exhibiting a high growth rate when PM_2.5 concentration was below 200 μg m⁻³, and gradually leveling off thereafter. However, when PM_2.5 concentration exceeded 427 μg m⁻³, LWC, fog duration, and fog-top height all rapidly decreased with increasing aerosol concentrations, due to suppressing effect induced by aerosol-radiation interaction (ARI) overweighed promoting effect of aerosol-cloud interaction (ACI) on fog. Meanwhile, excessive cloud condensation nuclei suppressed fog through the intense competitions for vapor and the evaporation of smaller droplets. The results suggested that a PM_2.5 concentration in the range of 395–427 μg m⁻³ is the critical threshold that suppressed fog in the NCP, and current pollution levels remain below this threshold. In addition, we analyzed the individual effects of ARI, ACI, black carbon (BC) and non-BC aerosols on fog under current pollution level. The results suggested that ARI effect played a dominant role during the fog–haze episode, while the effect of ACI on fog was negligible. Furthermore, the results showed that BC played a leading role in fog formation.

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高人为气溶胶水平对华北平原雾演变的影响：基于实例的物理机制分析

关于气溶胶浓度对雾的影响的现有发现是不一致的，主要集中在低气溶胶水平的影响上。本研究利用WRF-Chem模式研究了高气溶胶水平对雾的影响，以评估气溶胶水平对华北平原雾的影响程度。结果表明：液态水含量、雾时、雾顶高度均随气溶胶浓度的增加呈非线性增长，在PM2.5浓度低于200 μg m−3时呈现较高的增长速率，此后逐渐趋于平稳；当PM2.5浓度超过427 μg m−3时，随着气溶胶浓度的增加，LWC、雾持续时间和雾顶高度均迅速降低，这是由于气溶胶-辐射相互作用（ARI）对雾的抑制作用大于气溶胶-云相互作用（ACI）对雾的促进作用。同时，过多的云凝结核通过激烈的水汽竞争和小液滴的蒸发抑制了雾。结果表明，PM2.5浓度在395 ~ 427 μg m−3范围内是抑制雾的临界阈值，目前的污染水平仍低于该阈值。此外，我们还分析了当前污染水平下ARI、ACI、黑碳（BC）和非黑碳气溶胶对雾的个体影响。结果表明，在雾霾期间，ARI效应起主导作用，而ACI对雾的影响可以忽略不计。结果表明，BC在雾的形成中起主导作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.