Deep stratospheric intrusion and Russian wildfire induce enhanced tropospheric ozone pollution over the northern Tibetan Plateau
Deep stratospheric intrusion and Russian wildfire induce enhanced tropospheric ozone pollution over the northern Tibetan Plateau
复制标题
平流层深层入侵和俄罗斯野火导致青藏高原北部对流层臭氧污染加剧
DOI：
10.1016/j.atmosres.2021.105662
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发表时间：
2021
影响因子：
5.5
通讯作者：
Bai Zhixuan
中科院分区：
文献类型：
--
作者：
Zhang Jinqiang;Li Dan;Bian Jianchun;Bai Zhixuan
通过使用2016年、2019年和2020年7月至8月在格尔木和柴达木的臭氧探空仪测量、欧洲中期天气预报中心（ECMWF）下一代再分析ERA 5数据、星载中分辨率成像光谱仪数据产品以及平流层化学拉格朗日模型（CLaMS）模型的后向轨迹计算，摘要本文分析了亚洲夏季风期间青藏高原北方臭氧的垂直分布，并探讨了平流层入侵和野火对臭氧变化的影响。在20至30公里之间观测到了较大的臭氧分压，在纬度约27公里处的最大值约为16 mPa。对流层顶（15.8 km）臭氧垂直廓线的相对差异达72.4%，对流层中层（10.1 km）臭氧垂直廓线的相对差异达66.7%。平流层入侵使大气干燥了52.9%，对流层上部和平流层下部的臭氧柱增加了26.1%。一次平流层深层入侵的个例研究详细地揭示了对流层中层臭氧分压的发生，在10 km处出现了一个约6 mPa的臭氧峰值，这是由于亚洲夏季风高压北侧西风急流引起对流层顶褶皱造成的。平流层入侵过程有效地将平流层高臭氧的干冷气团向下输送到北方TP对流层中层。这项研究还证实，通过长距离传输过程，2016年7月19日至26日在俄罗斯中部和东部发生的大规模野火烟雾极大地造成了北方TP对流层（距地面6 km深度）的臭氧污染。
By using ozonesonde measurements during July–August in 2016, 2019, and 2020 at Golmud and Qaidam, European Centre for Medium-Range Weather Forecasts (ECMWF) next-generation reanalysis ERA5 data, satellite-borne Moderate Resolution Imaging Spectrometer data products, and backward trajectory calculations from the chemical Lagrangian model of the stratosphere (CLaMS) model, this study analyzes vertical ozone distributions and explores the influence of deep stratospheric intrusions and wildfires on ozone variation in the northern Tibetan Plateau (TP) during the Asian summer monsoon period. Large ozone partial pressures were observed between 20 and 30 km, with a maximum of ~16 mPa at approximately 27 km latitude. The comparisons between the vertical ozone profiles with and without the occurrence of stratospheric intrusions showed that their relative ozone difference was up to 72.4% in the tropopause layer (15.8 km), and a secondary maximum of 66.7% existed in the middle troposphere (10.1 km). The stratospheric intrusions dried the atmosphere by 52.9% and enhanced the ozone columns by 26.1% below the upper troposphere and lower stratosphere. A case study of deep stratospheric intrusion exhibited the occurrence of large ozone partial pressure in the middle troposphere in detail, with an ozone peak of ~6 mPa at 10 km, which was caused by a tropopause fold associated with the westerly wind jet at the north flank of the Asian summer monsoon anticyclone. The stratospheric intrusion processes effectively transported the cold and dry air mass with high ozone in the stratosphere downward to the middle troposphere over the northern TP. This study also confirmed that by long-range transport processes, large wildfire smoke occurred around central and eastern Russia on 19–26 July 2016 greatly caused ozone pollution in the troposphere (6 km depth from the surface) over the northern TP.