Contrasting the effect of aerosol properties on the planetary boundary layer height in Beijing and Nanjing
Contrasting the effect of aerosol properties on the planetary boundary layer height in Beijing and Nanjing
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DOI：
10.1016/j.atmosenv.2023.119861
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发表时间：
2023-05
影响因子：
5
通讯作者：
Xin Huang;Yuying Wang;Yi Shang;Xiaorui Song;Rui Zhang;Yuxiang Wang;Zhanqing Li;Yuanjian Yang
中科院分区：
文献类型：
--
作者：
Xin Huang;Yuying Wang;Yi Shang;Xiaorui Song;Rui Zhang;Yuxiang Wang;Zhanqing Li;Yuanjian Yang
根据北京和南京两个长期观测站的观测资料，比较了北京和南京地区的边界层演变以及气溶胶对边界层的影响。南京和北京的月边界层高度（PBLH）变化趋势基本一致，而小于2.5 μm的颗粒物（PM2.5）质量浓度变化趋势相反。这一现象在南京比在北京更明显。南京市PM2.5质量浓度与PBLH的负相关性弱于北京市。PBLH在白天变化。在北京地区，由于大气气溶胶污染严重，这种变化在秋冬季减弱。进一步的研究结果表明，在所有的季节，夏季PM2.5对PBL的演变影响最大。南京市的PBLH对PM2.5质量浓度变化的敏感性高于北京市。气溶胶类型（散射气溶胶和吸收气溶胶）对南京地区大气环流的影响较小，而北京地区则以吸收气溶胶为主。我们的研究结果突出了气溶胶PBL相互作用的跨区域差异。
The evolution of the planetary boundary layer (PBL) and the effect of aerosols on the PBL in Beijing and Nanjing were compared based on measurements made during two long-term field campaigns. Monthly PBL height (PBLH) trends in Nanjing and Beijing were similar, opposite to those of the mass concentration of particles with diameters less than 2.5 μm (PM2.5). This phenomenon was more obvious in Nanjing than in Beijing. The negative correlation between PBLH and PM2.5mass concentration was weaker in Nanjing than in Beijing. The PBLH varied during the day. Heavy aerosol pollution made this variation weak in autumn and winter in Beijing. Further results suggest that out of all the seasons, summertime PM2.5had the greatest influence on the evolution of the PBL. The PBLH was more sensitive to the variation in PM2.5mass concentration in Nanjing than in Beijing. Aerosol type (scattering or absorbing) had a weak effect on the evolution of the PBLH in Nanjing, but absorbing aerosols played a dominant role in Beijing. Our results highlight the cross-regional difference in aerosol-PBL interactions.