The effect of earth-air passive exchange on the formation of haze patterns
The effect of earth-air passive exchange on the formation of haze patterns
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DOI：
10.1007/s12665-021-09962-3
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发表时间：
2021-11
影响因子：
2.8
通讯作者：
Hongshou Li;Yipu Gong;Shunren Wang;Qinglin Guo
中科院分区：
文献类型：
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作者：
Hongshou Li;Yipu Gong;Shunren Wang;Qinglin Guo
随着发展中国家城市化和经济增长的扩大，雾霾已经成为一个全球性的城市环境问题。雾霾在全球有明显的季节/日变化。细颗粒物浓度冬季较高，夏季较低，日变化呈双峰型特征。本文的目的是研究这一模式的形成机制。通过监测和相关分析，研究了土壤-空气与细颗粒物浓度的耦合关系。监测结果表明，地压总体上随大气总压力而波动。土壤-空气存在“被动呼吸”机制，由于季节/日土壤温度变化的影响，也存在“自主呼吸”机制。自主呼吸效应较小（3.57 mm/d），而被动呼吸效应较大（421.25 mm/d）。土壤空气被动呼吸量与pm2.5在年际和日尺度上的相关系数分别为0.82和0.84。统计分析表明，当大气压力升高时，大气空气被压缩，浓度增加。与此同时，一部分大气进入土壤并引起反混合。当大气压力下降时，大气中空气膨胀，过滤后的土空气进入大气，降低近地表pm2.5浓度。这导致pm2.5浓度与大地-空气被动呼吸同步变化。因此，被动呼吸地球空气对雾霾格局的形成有重要影响，大气抽吸效应提供了主要驱动力。
As urbanization and economic growth in developing countries expands, haze has become a global environmental problem in urban areas. Haze has obvious seasonal/daily variations across the globe. The concentration of fine particulate matter is higher in winter and lower in summer, and its daily variation shows bimodal characteristics. The objective of this paper is researching the formation mechanism of this pattern. The coupling between earth-air and fine particulate concentration is studied by monitoring and correlation analysis. Monitoring results have shown that earth-air pressure generally fluctuates with the overall atmospheric pressure. There is a mechanism of ‘passive breathing’ of earth-air, and due to the effect of seasonal/daily changes in soil temperature, ‘autonomous breathing’ also exists. The magnitude of the autonomous breathing effect is small (3.57 mm/d), whereas the passive breathing effect is much larger (421.25 mm/d). Correlation coefficients between volume of earth-air passive breathing and PM2.5on yearly and daily timescales are 0.82 and 0.84, respectively. Statistical analysis suggests that when atmospheric pressure rises, atmospheric air is compressed, and concentration increases. At the same time, a part of the atmosphere enters the soil and causes back-mixing. When atmospheric pressure drops, atmospheric air expands, and filtered earth-air enters the atmosphere, reducing the near-surface PM2.5concentration. This results in PM2.5concentration changing synchronously with the earth-air passive breathing. Therefore, passive breathing of earth-air has important impact on the formation of haze patterns, and the atmospheric pumping effect provides the main driving force.