An evaluation of the interaction of morning residual layer ozone and mixing layer ozone in rural areas of the North China Plain
An evaluation of the interaction of morning residual layer ozone and mixing layer ozone in rural areas of the North China Plain
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DOI：
10.1016/j.atmosres.2019.104788
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发表时间：
2020-05
影响因子：
5.5
通讯作者：
Xiaowan Zhu;Zhiqiang Ma;Yulu Qiu;H. Liu;Quan Liu;Xiaomei Yin
中科院分区：
文献类型：
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作者：
Xiaowan Zhu;Zhiqiang Ma;Yulu Qiu;H. Liu;Quan Liu;Xiaomei Yin
2012年和2013年夏季，利用系留气球在涿州和古城两个农村站点测量了臭氧（O3）浓度廓线和气象参数，探讨了清晨残留层（RL） O3和混合层（ML） O3的相互作用。结果表明，在过渡时段（06:00 LT-10:00 LT），来自前一天或周围运输的臭氧将被储存在RL中，并通过向下混合对地面臭氧产生显著影响。RL中o3储存量越大，o3污染碱浓度越高。一般来说，向下混合和光化学反应共同促进了表面o3的变化，而o3的水平输运将进一步增强这种影响。有时，即使气象条件不变，地面臭氧浓度仍可通过前一天的o3结转逐渐积累。这种向下混合过程的影响通常在8:00 - 10:00 lt时最大。从前一天携带的o3浓度可高达76.8 ppb。与当地光化学产物相比，在过渡时间内，RL o3可以贡献50%以上的表面o3。结果表明，华北平原农村地区的清晨rl3对ML - o3有显著影响。了解这一机制将有助于实验研究和空气质量模型的改进。
Profiles of the ozone (O3) concentration and meteorological parameters were measured with tethered balloons at two rural sites (the Zhuozhou and Gucheng stations) in the summer of 2012 and 2013 to investigate the interaction of morning residual layer (RL) O3and mixing layer (ML) O3. Results revealed that O3from the previous day or surrounding transport will be stored in the RL and made significant impact on surface O3via downward mixing during transition hours (06:00 LT-10:00 LT). More O3was stored in the RL, the higher base concentration for O3pollution was existed. Generally, the downward mixing and photochemical reaction jointly contribute to the surface O3variation and horizontal transport of O3will further enhance this impact. Sometimes, even though the meteorological condition is unchanged, surface O3concentration could still be gradually accumulated via O3carried over from the preceding day. Impact of this downward mixing process was usually the greatest from 8: 00-10: 00 LT. Concentration of the O3carried over from the previous day can be as high as 76.8 ppb. Compared with local photochemical production, the RL O3could contribute more than 50% to the surface O3during transition hours. As a result, morning RL O3significantly influence the ML O3in rural areas of the North China Plain. Understanding of this mechanism will contribute to the experiment study and the improvement of air quality model.