Regional PM_2.5 pollution confined by atmospheric internal boundaries in the North China Plain: boundary layer structures and numerical simulation by X. Jin, X. Cai, M. Yu, Y. Song, X. Wang, H. Zhang, T. Zhu

“…It is in sharp contrast to the well-mixed/ventilated PBL in the southern plains, especially in the afternoon. At night, this meteorological discontinuity becomes less pronounced. …”
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Unexpectedly high concentrations of atmospheric mercury species in Lhasa, the largest city in the Tibetan Plateau by H. Lin, Y. Tong, Y. Tong, L. Chen, C. Yu, Z. Chu, Q. Zhang, X. Yin, Q. Zhang, Q. Zhang, S. Kang, S. Kang, J. Liu, J. Schauer, J. Schauer, B. de Foy, X. Wang

“…The lowest GEM concentrations occurred in the afternoon, and persistently high concentrations were observed at night. …”
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Rethinking the role of transport and photochemistry in regional ozone pollution: insights from ozone concentration and mass budgets by K. Qu, K. Qu, K. Qu, X. Wang, X. Wang, X. Cai, X. Cai, Y. Yan, Y. Yan, X. Jin, X. Jin, M. Vrekoussis, M. Vrekoussis, M. Vrekoussis, M. Kanakidou, M. Kanakidou, G. P. Brasseur, G. P. Brasseur, J. Shen, T. Xiao, T. Xiao, L. Zeng, L. Zeng, Y. Zhang, Y. Zhang, Y. Zhang, Y. Zhang

“…Quantified results demonstrate the different role of transport and photochemistry when comparing the two O<span class="inline-formula">₃</span> budgets: photochemistry drives the rapid increase of O<span class="inline-formula">₃</span> concentrations during the day, whereas transport, especially vertical exchange through the ABL top, controls both rapid O<span class="inline-formula">₃</span> mass increase in the morning and decrease in the afternoon. The diurnal changes of the transport contributions in the two O<span class="inline-formula">₃</span> budgets highlight the influences of the ABL diurnal cycle and regional wind fields on regional O<span class="inline-formula">₃</span> pollution. …”
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The important contribution of secondary formation and biomass burning to oxidized organic nitrogen (OON) in a polluted urban area: insights from in situ measurements of a chemical... by Y. Cai, Y. Cai, Y. Cai, Y. Cai, Y. Cai, C. Ye, W. Chen, W. Chen, W. Chen, W. Chen, W. Chen, W. Hu, W. Hu, W. Hu, W. Hu, W. Song, W. Song, W. Song, W. Song, Y. Peng, Y. Peng, S. Huang, S. Huang, J. Qi, J. Qi, S. Wang, S. Wang, C. Wang, C. Wang, C. Wu, C. Wu, Z. Wang, Z. Wang, B. Wang, X. Huang, L. He, S. Gligorovski, S. Gligorovski, S. Gligorovski, S. Gligorovski, B. Yuan, B. Yuan, M. Shao, M. Shao, X. Wang, X. Wang, X. Wang, X. Wang

“…A high concentration of NO<span class="inline-formula">₃</span> radicals during the afternoon was observed, demonstrating that the daytime NO<span class="inline-formula">₃</span> oxidation might be more important than the previous recognition. …”
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Impact of aging on the sources, volatility, and viscosity of organic aerosols in Chinese outflows by T. Feng, T. Feng, T. Feng, T. Feng, T. Feng, Y. Wang, Y. Wang, Y. Wang, Y. Wang, Y. Wang, W. Hu, W. Hu, W. Hu, W. Hu, W. Hu, M. Zhu, M. Zhu, M. Zhu, M. Zhu, M. Zhu, W. Song, W. Song, W. Song, W. Song, W. Chen, W. Chen, W. Chen, W. Chen, W. Chen, Y. Sang, Z. Fang, Z. Fang, Z. Fang, Z. Fang, Z. Fang, W. Deng, W. Deng, W. Deng, W. Deng, W. Deng, H. Fang, H. Fang, H. Fang, H. Fang, H. Fang, H. Fang, X. Yu, X. Yu, X. Yu, X. Yu, X. Yu, C. Wu, B. Yuan, S. Huang, M. Shao, X. Huang, L. He, Y. R. Lee, L. G. Huey, F. Canonaco, F. Canonaco, A. S. H. Prevot, X. Wang, X. Wang, X. Wang, X. Wang, X. Wang

“…Finally, the estimated mixing time of molecules in 200 nm OA varies dramatically from minutes at night to years in the afternoon, emphasizing the need to consider its dynamic kinetic limits when modeling OA. …”
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Impact of HO₂ aerosol uptake on radical levels and O₃ production during summertime in Beijing by J. E. Dyson, L. K. Whalley, L. K. Whalley, E. J. Slater, E. J. Slater, R. Woodward-Massey, C. Ye, J. D. Lee, J. D. Lee, F. Squires, F. Squires, J. R. Hopkins, J. R. Hopkins, R. E. Dunmore, M. Shaw, M. Shaw, J. F. Hamilton, A. C. Lewis, A. C. Lewis, S. D. Worrall, A. Bacak, A. Mehra, A. Mehra, T. J. Bannan, H. Coe, H. Coe, C. J. Percival, B. Ouyang, C. N. Hewitt, R. L. Jones, L. R. Crilley, L. J. Kramer, W. J. F. Acton, W. J. Bloss, S. Saksakulkrai, J. Xu, J. Xu, Z. Shi, R. M. Harrison, R. M. Harrison, S. Kotthaus, S. Kotthaus, S. Grimmond, Y. Sun, W. Xu, S. Yue, S. Yue, S. Yue, L. Wei, L. Wei, P. Fu, P. Fu, X. Wang, S. R. Arnold, D. E. Heard

“…</p> <p>Using modelled radical concentrations, the absolute O<span class="inline-formula">₃</span> sensitivity to NO<span class="inline-formula">_<i>x</i></span> and volatile organic compounds (VOCs) showed that, on average across the summer AIRPRO campaign, the O<span class="inline-formula">₃</span> production regime remained VOC-limited, with the exception of a few days in the afternoon when the NO mixing ratio dropped low enough for the O<span class="inline-formula">₃</span> regime to shift towards being NO<span class="inline-formula">_<i>x</i></span>-limited. …”
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