Aerosol-boundary layer interaction modulated entrainment process
Aerosol-boundary layer interaction modulated entrainment process
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DOI：
10.1038/s41612-022-00283-1
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发表时间：
2022-08
影响因子：
9
通讯作者：
T. Su;Zhanqing Li;Youtong Zheng;Tong Wu;Hao Wu;Jianping Guo
中科院分区：
文献类型：
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作者：
T. Su;Zhanqing Li;Youtong Zheng;Tong Wu;Hao Wu;Jianping Guo
气溶胶-边界层相互作用在影响大气热力学和空气污染方面起着重要作用。作为决定边界层发展的关键因素，气溶胶-边界层相互作用背景下的卷吸过程仍然知之甚少。利用北京超级站的综合观测资料，我们深入了解了卷吸过程对气溶胶的响应。我们发现，高气溶胶负荷可以显着抑制卷吸率，打破了传统的线性关系感热通量和卷吸通量。与气溶胶垂直分布有关，气溶胶加热效应可以改变垂直热通量，导致气溶胶与上边界层卷吸过程之间的强烈相互作用。这种气溶胶卷吸耦合可以抑制边界层的发展，并解释了观测到的卷吸率比传统计算对气溶胶的敏感性大。气溶胶对卷吸过程的显著影响引发了对污染大气边界层动力结构的整体思考，这可能对空气污染物的扩散和陆-气耦合有重要影响。
Aerosol-boundary layer interactions play an important role in affecting atmospheric thermodynamics and air pollution. As a key factor in dictating the development of the boundary layer, the entrainment process in the context of aerosol-boundary layer interactions is still poorly understood. Using comprehensive field observations made at a superstation in Beijing, we gain insight into the response of the entrainment process to aerosols. We found that high aerosol loading can significantly suppress the entrainment rate, breaking the conventional linear relationship between sensible heat fluxes and entrainment fluxes. Related to aerosol vertical distributions, aerosol heating effects can alter vertical heat fluxes, leading to a strong interaction between aerosols and the entrainment process in the upper boundary layer. Such aerosol-entrainment coupling can inhibit boundary layer development and explains the great sensitivity of observed entrainment rates to aerosols than can traditional calculations. The notable impact of aerosols on the entrainment process raises holistic thinking about the dynamic framework of the boundary layer in a polluted atmosphere, which may have a significant bearing on the dispersion of air pollutants and the land-atmosphere coupling.