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    • The Impact of Tropopause Fold Event on Surface Ozone Concentration over Tibetan Plateau in July

    Tian Liang,Jiali Luo,Chongyang Zhang,Hongying Tian,Zhixuan Bai,Jianchun Bian,Zhiting Wang,Fuhai Luo,Fangrui Zhu, Lixin Mao,Xin He, Shuyu Wang,Kequan Zhang,Jiankai Zhang

    Atmospheric Research（2023）

    Lanzhou Univ | Chinese Acad Sci | Minle Cty Meteorol Bur

    Cited 1|Views25
    Abstract
    Tropopause fold events are one of the major processes in stratosphere-troposphere exchange (STE) in the mid-latitudes. The Tibetan Plateau (TP) is a hotspot of STE in the world. It has been proved that the tropopause fold events over the TP could impact on tropospheric ozone concentration in summer, yet most of these studies only focus on tropopause fold events at individual stations. In this study, we use ozone soundings data over Minle County (38.41°N, 100.65°E) and surface observations in the TP to verify the effect of tropopause fold events on surface ozone concentration. The stratospheric ozone tracers (O3S) simulation by the WACCM model and the passive tracers simulation by the WRF model indicate that the tropopause fold event observed on 11 July 2020 contributed to surface ozone in the northern regions of TP. In addition, we identified all the tropopause fold events that occurred over the TP in each July from 2015 to 2020 and quantified their impacts on surface ozone concentration. The results show that the average increase in surface ozone concentration is 15.94 ppbv during the period affected by the tropopause fold events. The site most affected by tropopause fold events is Shannan City, followed by Nyingchi City. This study revealed the importance of the influence of tropopause fold event on surface ozone concentration in the TP in summer.
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    Key words
    Tropopause fold,Surface ozone,Tibetan Plateau,July,Stratosphere-Troposphere exchange
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    【要点】：本研究揭示了 tropopause fold 事件在夏季对青藏高原表面臭氧浓度的重要影响，并通过 Minle County 的臭氧探空气球数据和青藏高原的表面观测进行了验证。创新点在于，研究量化了 2015-2020 年间每年 7 月青藏高原上 tropopause fold 事件对表面臭氧浓度的影响，揭示了其对青藏高原地区 surface ozone 浓度的显著影响。
    

    【方法】：使用了 Minle County 的臭氧探空气球数据和青藏高原的表面观测数据，以及 WACCM 模型和 WRF 模型的模拟数据。
    

    【实验】：通过 WACCM 模型和 WRF 模型的模拟，验证了 2020 年 7 月 11 日观察到的 tropopause fold 事件对青藏高原北部地区表面臭氧的贡献。此外，识别并量化了 2015-2020 年间每年 7 月青藏高原上所有 tropopause fold 事件对表面臭氧浓度的影响，结果显示受 tropopause fold 事件影响期间，平均表面臭氧浓度增加了 15.94 ppbv。Shannan 市受影响最严重，其次是中国林芝市。